2464 lines
68 KiB
C
2464 lines
68 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_SCHED_H
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#define _LINUX_SCHED_H
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/*
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* Define 'struct task_struct' and provide the main scheduler
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* APIs (schedule(), wakeup variants, etc.)
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*/
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#include <uapi/linux/sched.h>
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#include <asm/current.h>
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#include <linux/pid.h>
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#include <linux/sem.h>
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#include <linux/shm.h>
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#include <linux/kmsan_types.h>
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#include <linux/mutex.h>
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#include <linux/plist.h>
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#include <linux/hrtimer.h>
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#include <linux/irqflags.h>
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#include <linux/seccomp.h>
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#include <linux/nodemask.h>
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#include <linux/rcupdate.h>
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#include <linux/refcount.h>
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#include <linux/resource.h>
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#include <linux/latencytop.h>
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#include <linux/sched/prio.h>
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#include <linux/sched/types.h>
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#include <linux/signal_types.h>
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#include <linux/syscall_user_dispatch.h>
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#include <linux/mm_types_task.h>
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#include <linux/task_io_accounting.h>
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#include <linux/posix-timers.h>
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#include <linux/rseq.h>
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#include <linux/seqlock.h>
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#include <linux/kcsan.h>
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#include <linux/rv.h>
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#include <asm/kmap_size.h>
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/* task_struct member predeclarations (sorted alphabetically): */
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struct audit_context;
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struct backing_dev_info;
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struct bio_list;
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struct blk_plug;
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struct bpf_local_storage;
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struct bpf_run_ctx;
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struct capture_control;
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struct cfs_rq;
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struct fs_struct;
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struct futex_pi_state;
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struct io_context;
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struct io_uring_task;
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struct mempolicy;
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struct nameidata;
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struct nsproxy;
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struct perf_event_context;
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struct pid_namespace;
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struct pipe_inode_info;
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struct rcu_node;
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struct reclaim_state;
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struct robust_list_head;
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struct root_domain;
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struct rq;
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struct sched_attr;
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struct sched_param;
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struct seq_file;
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struct sighand_struct;
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struct signal_struct;
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struct task_delay_info;
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struct task_group;
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/*
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* Task state bitmask. NOTE! These bits are also
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* encoded in fs/proc/array.c: get_task_state().
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*
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* We have two separate sets of flags: task->state
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* is about runnability, while task->exit_state are
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* about the task exiting. Confusing, but this way
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* modifying one set can't modify the other one by
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* mistake.
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*/
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/* Used in tsk->state: */
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#define TASK_RUNNING 0x00000000
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#define TASK_INTERRUPTIBLE 0x00000001
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#define TASK_UNINTERRUPTIBLE 0x00000002
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#define __TASK_STOPPED 0x00000004
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#define __TASK_TRACED 0x00000008
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/* Used in tsk->exit_state: */
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#define EXIT_DEAD 0x00000010
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#define EXIT_ZOMBIE 0x00000020
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#define EXIT_TRACE (EXIT_ZOMBIE | EXIT_DEAD)
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/* Used in tsk->state again: */
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#define TASK_PARKED 0x00000040
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#define TASK_DEAD 0x00000080
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#define TASK_WAKEKILL 0x00000100
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#define TASK_WAKING 0x00000200
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#define TASK_NOLOAD 0x00000400
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#define TASK_NEW 0x00000800
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#define TASK_RTLOCK_WAIT 0x00001000
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#define TASK_FREEZABLE 0x00002000
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#define __TASK_FREEZABLE_UNSAFE (0x00004000 * IS_ENABLED(CONFIG_LOCKDEP))
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#define TASK_FROZEN 0x00008000
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#define TASK_STATE_MAX 0x00010000
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#define TASK_ANY (TASK_STATE_MAX-1)
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/*
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* DO NOT ADD ANY NEW USERS !
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*/
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#define TASK_FREEZABLE_UNSAFE (TASK_FREEZABLE | __TASK_FREEZABLE_UNSAFE)
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/* Convenience macros for the sake of set_current_state: */
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#define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)
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#define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED)
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#define TASK_TRACED __TASK_TRACED
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#define TASK_IDLE (TASK_UNINTERRUPTIBLE | TASK_NOLOAD)
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/* Convenience macros for the sake of wake_up(): */
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#define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
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/* get_task_state(): */
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#define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \
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TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
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__TASK_TRACED | EXIT_DEAD | EXIT_ZOMBIE | \
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TASK_PARKED)
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#define task_is_running(task) (READ_ONCE((task)->__state) == TASK_RUNNING)
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#define task_is_traced(task) ((READ_ONCE(task->jobctl) & JOBCTL_TRACED) != 0)
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#define task_is_stopped(task) ((READ_ONCE(task->jobctl) & JOBCTL_STOPPED) != 0)
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#define task_is_stopped_or_traced(task) ((READ_ONCE(task->jobctl) & (JOBCTL_STOPPED | JOBCTL_TRACED)) != 0)
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/*
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* Special states are those that do not use the normal wait-loop pattern. See
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* the comment with set_special_state().
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*/
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#define is_special_task_state(state) \
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((state) & (__TASK_STOPPED | __TASK_TRACED | TASK_PARKED | TASK_DEAD))
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#ifdef CONFIG_DEBUG_ATOMIC_SLEEP
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# define debug_normal_state_change(state_value) \
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do { \
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WARN_ON_ONCE(is_special_task_state(state_value)); \
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current->task_state_change = _THIS_IP_; \
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} while (0)
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# define debug_special_state_change(state_value) \
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do { \
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WARN_ON_ONCE(!is_special_task_state(state_value)); \
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current->task_state_change = _THIS_IP_; \
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} while (0)
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# define debug_rtlock_wait_set_state() \
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do { \
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current->saved_state_change = current->task_state_change;\
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current->task_state_change = _THIS_IP_; \
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} while (0)
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# define debug_rtlock_wait_restore_state() \
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do { \
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current->task_state_change = current->saved_state_change;\
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} while (0)
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#else
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# define debug_normal_state_change(cond) do { } while (0)
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# define debug_special_state_change(cond) do { } while (0)
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# define debug_rtlock_wait_set_state() do { } while (0)
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# define debug_rtlock_wait_restore_state() do { } while (0)
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#endif
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/*
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* set_current_state() includes a barrier so that the write of current->state
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* is correctly serialised wrt the caller's subsequent test of whether to
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* actually sleep:
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*
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* for (;;) {
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* set_current_state(TASK_UNINTERRUPTIBLE);
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* if (CONDITION)
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* break;
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*
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* schedule();
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* }
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* __set_current_state(TASK_RUNNING);
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*
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* If the caller does not need such serialisation (because, for instance, the
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* CONDITION test and condition change and wakeup are under the same lock) then
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* use __set_current_state().
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*
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* The above is typically ordered against the wakeup, which does:
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*
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* CONDITION = 1;
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* wake_up_state(p, TASK_UNINTERRUPTIBLE);
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*
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* where wake_up_state()/try_to_wake_up() executes a full memory barrier before
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* accessing p->state.
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*
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* Wakeup will do: if (@state & p->state) p->state = TASK_RUNNING, that is,
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* once it observes the TASK_UNINTERRUPTIBLE store the waking CPU can issue a
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* TASK_RUNNING store which can collide with __set_current_state(TASK_RUNNING).
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*
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* However, with slightly different timing the wakeup TASK_RUNNING store can
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* also collide with the TASK_UNINTERRUPTIBLE store. Losing that store is not
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* a problem either because that will result in one extra go around the loop
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* and our @cond test will save the day.
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*
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* Also see the comments of try_to_wake_up().
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*/
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#define __set_current_state(state_value) \
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do { \
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debug_normal_state_change((state_value)); \
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WRITE_ONCE(current->__state, (state_value)); \
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} while (0)
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#define set_current_state(state_value) \
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do { \
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debug_normal_state_change((state_value)); \
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smp_store_mb(current->__state, (state_value)); \
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} while (0)
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/*
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* set_special_state() should be used for those states when the blocking task
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* can not use the regular condition based wait-loop. In that case we must
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* serialize against wakeups such that any possible in-flight TASK_RUNNING
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* stores will not collide with our state change.
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*/
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#define set_special_state(state_value) \
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do { \
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unsigned long flags; /* may shadow */ \
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\
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raw_spin_lock_irqsave(¤t->pi_lock, flags); \
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debug_special_state_change((state_value)); \
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WRITE_ONCE(current->__state, (state_value)); \
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raw_spin_unlock_irqrestore(¤t->pi_lock, flags); \
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} while (0)
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/*
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* PREEMPT_RT specific variants for "sleeping" spin/rwlocks
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*
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* RT's spin/rwlock substitutions are state preserving. The state of the
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* task when blocking on the lock is saved in task_struct::saved_state and
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* restored after the lock has been acquired. These operations are
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* serialized by task_struct::pi_lock against try_to_wake_up(). Any non RT
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* lock related wakeups while the task is blocked on the lock are
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* redirected to operate on task_struct::saved_state to ensure that these
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* are not dropped. On restore task_struct::saved_state is set to
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* TASK_RUNNING so any wakeup attempt redirected to saved_state will fail.
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*
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* The lock operation looks like this:
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*
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* current_save_and_set_rtlock_wait_state();
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* for (;;) {
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* if (try_lock())
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* break;
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* raw_spin_unlock_irq(&lock->wait_lock);
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* schedule_rtlock();
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* raw_spin_lock_irq(&lock->wait_lock);
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* set_current_state(TASK_RTLOCK_WAIT);
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* }
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* current_restore_rtlock_saved_state();
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*/
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#define current_save_and_set_rtlock_wait_state() \
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do { \
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lockdep_assert_irqs_disabled(); \
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raw_spin_lock(¤t->pi_lock); \
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current->saved_state = current->__state; \
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debug_rtlock_wait_set_state(); \
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WRITE_ONCE(current->__state, TASK_RTLOCK_WAIT); \
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raw_spin_unlock(¤t->pi_lock); \
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} while (0);
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#define current_restore_rtlock_saved_state() \
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do { \
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lockdep_assert_irqs_disabled(); \
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raw_spin_lock(¤t->pi_lock); \
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debug_rtlock_wait_restore_state(); \
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WRITE_ONCE(current->__state, current->saved_state); \
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current->saved_state = TASK_RUNNING; \
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raw_spin_unlock(¤t->pi_lock); \
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} while (0);
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#define get_current_state() READ_ONCE(current->__state)
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/*
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* Define the task command name length as enum, then it can be visible to
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* BPF programs.
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*/
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enum {
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TASK_COMM_LEN = 16,
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};
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extern void scheduler_tick(void);
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#define MAX_SCHEDULE_TIMEOUT LONG_MAX
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extern long schedule_timeout(long timeout);
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extern long schedule_timeout_interruptible(long timeout);
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extern long schedule_timeout_killable(long timeout);
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extern long schedule_timeout_uninterruptible(long timeout);
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extern long schedule_timeout_idle(long timeout);
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asmlinkage void schedule(void);
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extern void schedule_preempt_disabled(void);
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asmlinkage void preempt_schedule_irq(void);
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#ifdef CONFIG_PREEMPT_RT
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extern void schedule_rtlock(void);
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#endif
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extern int __must_check io_schedule_prepare(void);
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extern void io_schedule_finish(int token);
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extern long io_schedule_timeout(long timeout);
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extern void io_schedule(void);
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/**
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* struct prev_cputime - snapshot of system and user cputime
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* @utime: time spent in user mode
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* @stime: time spent in system mode
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* @lock: protects the above two fields
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*
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* Stores previous user/system time values such that we can guarantee
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* monotonicity.
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*/
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struct prev_cputime {
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#ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
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u64 utime;
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u64 stime;
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raw_spinlock_t lock;
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#endif
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};
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enum vtime_state {
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/* Task is sleeping or running in a CPU with VTIME inactive: */
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VTIME_INACTIVE = 0,
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/* Task is idle */
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VTIME_IDLE,
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/* Task runs in kernelspace in a CPU with VTIME active: */
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VTIME_SYS,
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/* Task runs in userspace in a CPU with VTIME active: */
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VTIME_USER,
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/* Task runs as guests in a CPU with VTIME active: */
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VTIME_GUEST,
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};
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struct vtime {
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seqcount_t seqcount;
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unsigned long long starttime;
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enum vtime_state state;
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unsigned int cpu;
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u64 utime;
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u64 stime;
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u64 gtime;
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};
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/*
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* Utilization clamp constraints.
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* @UCLAMP_MIN: Minimum utilization
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* @UCLAMP_MAX: Maximum utilization
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* @UCLAMP_CNT: Utilization clamp constraints count
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*/
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enum uclamp_id {
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UCLAMP_MIN = 0,
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UCLAMP_MAX,
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UCLAMP_CNT
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};
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#ifdef CONFIG_SMP
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extern struct root_domain def_root_domain;
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extern struct mutex sched_domains_mutex;
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#endif
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struct sched_info {
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#ifdef CONFIG_SCHED_INFO
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/* Cumulative counters: */
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/* # of times we have run on this CPU: */
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unsigned long pcount;
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/* Time spent waiting on a runqueue: */
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unsigned long long run_delay;
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/* Timestamps: */
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/* When did we last run on a CPU? */
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unsigned long long last_arrival;
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/* When were we last queued to run? */
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unsigned long long last_queued;
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#endif /* CONFIG_SCHED_INFO */
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};
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/*
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* Integer metrics need fixed point arithmetic, e.g., sched/fair
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* has a few: load, load_avg, util_avg, freq, and capacity.
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*
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* We define a basic fixed point arithmetic range, and then formalize
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* all these metrics based on that basic range.
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*/
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# define SCHED_FIXEDPOINT_SHIFT 10
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# define SCHED_FIXEDPOINT_SCALE (1L << SCHED_FIXEDPOINT_SHIFT)
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/* Increase resolution of cpu_capacity calculations */
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# define SCHED_CAPACITY_SHIFT SCHED_FIXEDPOINT_SHIFT
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# define SCHED_CAPACITY_SCALE (1L << SCHED_CAPACITY_SHIFT)
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struct load_weight {
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unsigned long weight;
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u32 inv_weight;
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};
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/**
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* struct util_est - Estimation utilization of FAIR tasks
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* @enqueued: instantaneous estimated utilization of a task/cpu
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* @ewma: the Exponential Weighted Moving Average (EWMA)
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* utilization of a task
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*
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* Support data structure to track an Exponential Weighted Moving Average
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* (EWMA) of a FAIR task's utilization. New samples are added to the moving
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* average each time a task completes an activation. Sample's weight is chosen
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* so that the EWMA will be relatively insensitive to transient changes to the
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* task's workload.
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*
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* The enqueued attribute has a slightly different meaning for tasks and cpus:
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* - task: the task's util_avg at last task dequeue time
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* - cfs_rq: the sum of util_est.enqueued for each RUNNABLE task on that CPU
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* Thus, the util_est.enqueued of a task represents the contribution on the
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* estimated utilization of the CPU where that task is currently enqueued.
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*
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* Only for tasks we track a moving average of the past instantaneous
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* estimated utilization. This allows to absorb sporadic drops in utilization
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* of an otherwise almost periodic task.
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*
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* The UTIL_AVG_UNCHANGED flag is used to synchronize util_est with util_avg
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* updates. When a task is dequeued, its util_est should not be updated if its
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* util_avg has not been updated in the meantime.
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* This information is mapped into the MSB bit of util_est.enqueued at dequeue
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* time. Since max value of util_est.enqueued for a task is 1024 (PELT util_avg
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* for a task) it is safe to use MSB.
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*/
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struct util_est {
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unsigned int enqueued;
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unsigned int ewma;
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#define UTIL_EST_WEIGHT_SHIFT 2
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#define UTIL_AVG_UNCHANGED 0x80000000
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} __attribute__((__aligned__(sizeof(u64))));
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/*
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* The load/runnable/util_avg accumulates an infinite geometric series
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* (see __update_load_avg_cfs_rq() in kernel/sched/pelt.c).
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*
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* [load_avg definition]
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*
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* load_avg = runnable% * scale_load_down(load)
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*
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* [runnable_avg definition]
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*
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* runnable_avg = runnable% * SCHED_CAPACITY_SCALE
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*
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* [util_avg definition]
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*
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* util_avg = running% * SCHED_CAPACITY_SCALE
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*
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* where runnable% is the time ratio that a sched_entity is runnable and
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* running% the time ratio that a sched_entity is running.
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*
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* For cfs_rq, they are the aggregated values of all runnable and blocked
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* sched_entities.
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*
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* The load/runnable/util_avg doesn't directly factor frequency scaling and CPU
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* capacity scaling. The scaling is done through the rq_clock_pelt that is used
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* for computing those signals (see update_rq_clock_pelt())
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*
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* N.B., the above ratios (runnable% and running%) themselves are in the
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* range of [0, 1]. To do fixed point arithmetics, we therefore scale them
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* to as large a range as necessary. This is for example reflected by
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* util_avg's SCHED_CAPACITY_SCALE.
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*
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* [Overflow issue]
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*
|
|
* The 64-bit load_sum can have 4353082796 (=2^64/47742/88761) entities
|
|
* with the highest load (=88761), always runnable on a single cfs_rq,
|
|
* and should not overflow as the number already hits PID_MAX_LIMIT.
|
|
*
|
|
* For all other cases (including 32-bit kernels), struct load_weight's
|
|
* weight will overflow first before we do, because:
|
|
*
|
|
* Max(load_avg) <= Max(load.weight)
|
|
*
|
|
* Then it is the load_weight's responsibility to consider overflow
|
|
* issues.
|
|
*/
|
|
struct sched_avg {
|
|
u64 last_update_time;
|
|
u64 load_sum;
|
|
u64 runnable_sum;
|
|
u32 util_sum;
|
|
u32 period_contrib;
|
|
unsigned long load_avg;
|
|
unsigned long runnable_avg;
|
|
unsigned long util_avg;
|
|
struct util_est util_est;
|
|
} ____cacheline_aligned;
|
|
|
|
struct sched_statistics {
|
|
#ifdef CONFIG_SCHEDSTATS
|
|
u64 wait_start;
|
|
u64 wait_max;
|
|
u64 wait_count;
|
|
u64 wait_sum;
|
|
u64 iowait_count;
|
|
u64 iowait_sum;
|
|
|
|
u64 sleep_start;
|
|
u64 sleep_max;
|
|
s64 sum_sleep_runtime;
|
|
|
|
u64 block_start;
|
|
u64 block_max;
|
|
s64 sum_block_runtime;
|
|
|
|
u64 exec_max;
|
|
u64 slice_max;
|
|
|
|
u64 nr_migrations_cold;
|
|
u64 nr_failed_migrations_affine;
|
|
u64 nr_failed_migrations_running;
|
|
u64 nr_failed_migrations_hot;
|
|
u64 nr_forced_migrations;
|
|
|
|
u64 nr_wakeups;
|
|
u64 nr_wakeups_sync;
|
|
u64 nr_wakeups_migrate;
|
|
u64 nr_wakeups_local;
|
|
u64 nr_wakeups_remote;
|
|
u64 nr_wakeups_affine;
|
|
u64 nr_wakeups_affine_attempts;
|
|
u64 nr_wakeups_passive;
|
|
u64 nr_wakeups_idle;
|
|
|
|
#ifdef CONFIG_SCHED_CORE
|
|
u64 core_forceidle_sum;
|
|
#endif
|
|
#endif /* CONFIG_SCHEDSTATS */
|
|
} ____cacheline_aligned;
|
|
|
|
struct sched_entity {
|
|
/* For load-balancing: */
|
|
struct load_weight load;
|
|
struct rb_node run_node;
|
|
struct list_head group_node;
|
|
unsigned int on_rq;
|
|
|
|
u64 exec_start;
|
|
u64 sum_exec_runtime;
|
|
u64 vruntime;
|
|
u64 prev_sum_exec_runtime;
|
|
|
|
u64 nr_migrations;
|
|
|
|
#ifdef CONFIG_FAIR_GROUP_SCHED
|
|
int depth;
|
|
struct sched_entity *parent;
|
|
/* rq on which this entity is (to be) queued: */
|
|
struct cfs_rq *cfs_rq;
|
|
/* rq "owned" by this entity/group: */
|
|
struct cfs_rq *my_q;
|
|
/* cached value of my_q->h_nr_running */
|
|
unsigned long runnable_weight;
|
|
#endif
|
|
|
|
#ifdef CONFIG_SMP
|
|
/*
|
|
* Per entity load average tracking.
|
|
*
|
|
* Put into separate cache line so it does not
|
|
* collide with read-mostly values above.
|
|
*/
|
|
struct sched_avg avg;
|
|
#endif
|
|
};
|
|
|
|
struct sched_rt_entity {
|
|
struct list_head run_list;
|
|
unsigned long timeout;
|
|
unsigned long watchdog_stamp;
|
|
unsigned int time_slice;
|
|
unsigned short on_rq;
|
|
unsigned short on_list;
|
|
|
|
struct sched_rt_entity *back;
|
|
#ifdef CONFIG_RT_GROUP_SCHED
|
|
struct sched_rt_entity *parent;
|
|
/* rq on which this entity is (to be) queued: */
|
|
struct rt_rq *rt_rq;
|
|
/* rq "owned" by this entity/group: */
|
|
struct rt_rq *my_q;
|
|
#endif
|
|
} __randomize_layout;
|
|
|
|
struct sched_dl_entity {
|
|
struct rb_node rb_node;
|
|
|
|
/*
|
|
* Original scheduling parameters. Copied here from sched_attr
|
|
* during sched_setattr(), they will remain the same until
|
|
* the next sched_setattr().
|
|
*/
|
|
u64 dl_runtime; /* Maximum runtime for each instance */
|
|
u64 dl_deadline; /* Relative deadline of each instance */
|
|
u64 dl_period; /* Separation of two instances (period) */
|
|
u64 dl_bw; /* dl_runtime / dl_period */
|
|
u64 dl_density; /* dl_runtime / dl_deadline */
|
|
|
|
/*
|
|
* Actual scheduling parameters. Initialized with the values above,
|
|
* they are continuously updated during task execution. Note that
|
|
* the remaining runtime could be < 0 in case we are in overrun.
|
|
*/
|
|
s64 runtime; /* Remaining runtime for this instance */
|
|
u64 deadline; /* Absolute deadline for this instance */
|
|
unsigned int flags; /* Specifying the scheduler behaviour */
|
|
|
|
/*
|
|
* Some bool flags:
|
|
*
|
|
* @dl_throttled tells if we exhausted the runtime. If so, the
|
|
* task has to wait for a replenishment to be performed at the
|
|
* next firing of dl_timer.
|
|
*
|
|
* @dl_yielded tells if task gave up the CPU before consuming
|
|
* all its available runtime during the last job.
|
|
*
|
|
* @dl_non_contending tells if the task is inactive while still
|
|
* contributing to the active utilization. In other words, it
|
|
* indicates if the inactive timer has been armed and its handler
|
|
* has not been executed yet. This flag is useful to avoid race
|
|
* conditions between the inactive timer handler and the wakeup
|
|
* code.
|
|
*
|
|
* @dl_overrun tells if the task asked to be informed about runtime
|
|
* overruns.
|
|
*/
|
|
unsigned int dl_throttled : 1;
|
|
unsigned int dl_yielded : 1;
|
|
unsigned int dl_non_contending : 1;
|
|
unsigned int dl_overrun : 1;
|
|
|
|
/*
|
|
* Bandwidth enforcement timer. Each -deadline task has its
|
|
* own bandwidth to be enforced, thus we need one timer per task.
|
|
*/
|
|
struct hrtimer dl_timer;
|
|
|
|
/*
|
|
* Inactive timer, responsible for decreasing the active utilization
|
|
* at the "0-lag time". When a -deadline task blocks, it contributes
|
|
* to GRUB's active utilization until the "0-lag time", hence a
|
|
* timer is needed to decrease the active utilization at the correct
|
|
* time.
|
|
*/
|
|
struct hrtimer inactive_timer;
|
|
|
|
#ifdef CONFIG_RT_MUTEXES
|
|
/*
|
|
* Priority Inheritance. When a DEADLINE scheduling entity is boosted
|
|
* pi_se points to the donor, otherwise points to the dl_se it belongs
|
|
* to (the original one/itself).
|
|
*/
|
|
struct sched_dl_entity *pi_se;
|
|
#endif
|
|
};
|
|
|
|
#ifdef CONFIG_UCLAMP_TASK
|
|
/* Number of utilization clamp buckets (shorter alias) */
|
|
#define UCLAMP_BUCKETS CONFIG_UCLAMP_BUCKETS_COUNT
|
|
|
|
/*
|
|
* Utilization clamp for a scheduling entity
|
|
* @value: clamp value "assigned" to a se
|
|
* @bucket_id: bucket index corresponding to the "assigned" value
|
|
* @active: the se is currently refcounted in a rq's bucket
|
|
* @user_defined: the requested clamp value comes from user-space
|
|
*
|
|
* The bucket_id is the index of the clamp bucket matching the clamp value
|
|
* which is pre-computed and stored to avoid expensive integer divisions from
|
|
* the fast path.
|
|
*
|
|
* The active bit is set whenever a task has got an "effective" value assigned,
|
|
* which can be different from the clamp value "requested" from user-space.
|
|
* This allows to know a task is refcounted in the rq's bucket corresponding
|
|
* to the "effective" bucket_id.
|
|
*
|
|
* The user_defined bit is set whenever a task has got a task-specific clamp
|
|
* value requested from userspace, i.e. the system defaults apply to this task
|
|
* just as a restriction. This allows to relax default clamps when a less
|
|
* restrictive task-specific value has been requested, thus allowing to
|
|
* implement a "nice" semantic. For example, a task running with a 20%
|
|
* default boost can still drop its own boosting to 0%.
|
|
*/
|
|
struct uclamp_se {
|
|
unsigned int value : bits_per(SCHED_CAPACITY_SCALE);
|
|
unsigned int bucket_id : bits_per(UCLAMP_BUCKETS);
|
|
unsigned int active : 1;
|
|
unsigned int user_defined : 1;
|
|
};
|
|
#endif /* CONFIG_UCLAMP_TASK */
|
|
|
|
union rcu_special {
|
|
struct {
|
|
u8 blocked;
|
|
u8 need_qs;
|
|
u8 exp_hint; /* Hint for performance. */
|
|
u8 need_mb; /* Readers need smp_mb(). */
|
|
} b; /* Bits. */
|
|
u32 s; /* Set of bits. */
|
|
};
|
|
|
|
enum perf_event_task_context {
|
|
perf_invalid_context = -1,
|
|
perf_hw_context = 0,
|
|
perf_sw_context,
|
|
perf_nr_task_contexts,
|
|
};
|
|
|
|
struct wake_q_node {
|
|
struct wake_q_node *next;
|
|
};
|
|
|
|
struct kmap_ctrl {
|
|
#ifdef CONFIG_KMAP_LOCAL
|
|
int idx;
|
|
pte_t pteval[KM_MAX_IDX];
|
|
#endif
|
|
};
|
|
|
|
struct task_struct {
|
|
#ifdef CONFIG_THREAD_INFO_IN_TASK
|
|
/*
|
|
* For reasons of header soup (see current_thread_info()), this
|
|
* must be the first element of task_struct.
|
|
*/
|
|
struct thread_info thread_info;
|
|
#endif
|
|
unsigned int __state;
|
|
|
|
#ifdef CONFIG_PREEMPT_RT
|
|
/* saved state for "spinlock sleepers" */
|
|
unsigned int saved_state;
|
|
#endif
|
|
|
|
/*
|
|
* This begins the randomizable portion of task_struct. Only
|
|
* scheduling-critical items should be added above here.
|
|
*/
|
|
randomized_struct_fields_start
|
|
|
|
void *stack;
|
|
refcount_t usage;
|
|
/* Per task flags (PF_*), defined further below: */
|
|
unsigned int flags;
|
|
unsigned int ptrace;
|
|
|
|
#ifdef CONFIG_SMP
|
|
struct __call_single_node wake_entry;
|
|
#endif
|
|
#if defined(CONFIG_SMP) || defined(CONFIG_SCHED_ALT)
|
|
int on_cpu;
|
|
#endif
|
|
|
|
#ifdef CONFIG_SMP
|
|
#ifndef CONFIG_SCHED_ALT
|
|
unsigned int wakee_flips;
|
|
unsigned long wakee_flip_decay_ts;
|
|
struct task_struct *last_wakee;
|
|
|
|
/*
|
|
* recent_used_cpu is initially set as the last CPU used by a task
|
|
* that wakes affine another task. Waker/wakee relationships can
|
|
* push tasks around a CPU where each wakeup moves to the next one.
|
|
* Tracking a recently used CPU allows a quick search for a recently
|
|
* used CPU that may be idle.
|
|
*/
|
|
int recent_used_cpu;
|
|
int wake_cpu;
|
|
#endif /* !CONFIG_SCHED_ALT */
|
|
#endif
|
|
int on_rq;
|
|
|
|
int prio;
|
|
int static_prio;
|
|
int normal_prio;
|
|
unsigned int rt_priority;
|
|
|
|
#ifdef CONFIG_SCHED_ALT
|
|
u64 last_ran;
|
|
s64 time_slice;
|
|
int sq_idx;
|
|
struct list_head sq_node;
|
|
#ifdef CONFIG_SCHED_BMQ
|
|
int boost_prio;
|
|
#endif /* CONFIG_SCHED_BMQ */
|
|
#ifdef CONFIG_SCHED_PDS
|
|
u64 deadline;
|
|
#endif /* CONFIG_SCHED_PDS */
|
|
/* sched_clock time spent running */
|
|
u64 sched_time;
|
|
#else /* !CONFIG_SCHED_ALT */
|
|
struct sched_entity se;
|
|
struct sched_rt_entity rt;
|
|
struct sched_dl_entity dl;
|
|
const struct sched_class *sched_class;
|
|
|
|
#ifdef CONFIG_SCHED_CORE
|
|
struct rb_node core_node;
|
|
unsigned long core_cookie;
|
|
unsigned int core_occupation;
|
|
#endif
|
|
#endif /* !CONFIG_SCHED_ALT */
|
|
|
|
#ifdef CONFIG_CGROUP_SCHED
|
|
struct task_group *sched_task_group;
|
|
#endif
|
|
|
|
#ifdef CONFIG_UCLAMP_TASK
|
|
/*
|
|
* Clamp values requested for a scheduling entity.
|
|
* Must be updated with task_rq_lock() held.
|
|
*/
|
|
struct uclamp_se uclamp_req[UCLAMP_CNT];
|
|
/*
|
|
* Effective clamp values used for a scheduling entity.
|
|
* Must be updated with task_rq_lock() held.
|
|
*/
|
|
struct uclamp_se uclamp[UCLAMP_CNT];
|
|
#endif
|
|
|
|
struct sched_statistics stats;
|
|
|
|
#ifdef CONFIG_PREEMPT_NOTIFIERS
|
|
/* List of struct preempt_notifier: */
|
|
struct hlist_head preempt_notifiers;
|
|
#endif
|
|
|
|
#ifdef CONFIG_BLK_DEV_IO_TRACE
|
|
unsigned int btrace_seq;
|
|
#endif
|
|
|
|
unsigned int policy;
|
|
int nr_cpus_allowed;
|
|
const cpumask_t *cpus_ptr;
|
|
cpumask_t *user_cpus_ptr;
|
|
cpumask_t cpus_mask;
|
|
void *migration_pending;
|
|
#ifdef CONFIG_SMP
|
|
unsigned short migration_disabled;
|
|
#endif
|
|
unsigned short migration_flags;
|
|
|
|
#ifdef CONFIG_PREEMPT_RCU
|
|
int rcu_read_lock_nesting;
|
|
union rcu_special rcu_read_unlock_special;
|
|
struct list_head rcu_node_entry;
|
|
struct rcu_node *rcu_blocked_node;
|
|
#endif /* #ifdef CONFIG_PREEMPT_RCU */
|
|
|
|
#ifdef CONFIG_TASKS_RCU
|
|
unsigned long rcu_tasks_nvcsw;
|
|
u8 rcu_tasks_holdout;
|
|
u8 rcu_tasks_idx;
|
|
int rcu_tasks_idle_cpu;
|
|
struct list_head rcu_tasks_holdout_list;
|
|
#endif /* #ifdef CONFIG_TASKS_RCU */
|
|
|
|
#ifdef CONFIG_TASKS_TRACE_RCU
|
|
int trc_reader_nesting;
|
|
int trc_ipi_to_cpu;
|
|
union rcu_special trc_reader_special;
|
|
struct list_head trc_holdout_list;
|
|
struct list_head trc_blkd_node;
|
|
int trc_blkd_cpu;
|
|
#endif /* #ifdef CONFIG_TASKS_TRACE_RCU */
|
|
|
|
struct sched_info sched_info;
|
|
|
|
struct list_head tasks;
|
|
#ifdef CONFIG_SMP
|
|
struct plist_node pushable_tasks;
|
|
struct rb_node pushable_dl_tasks;
|
|
#endif
|
|
|
|
struct mm_struct *mm;
|
|
struct mm_struct *active_mm;
|
|
|
|
int exit_state;
|
|
int exit_code;
|
|
int exit_signal;
|
|
/* The signal sent when the parent dies: */
|
|
int pdeath_signal;
|
|
/* JOBCTL_*, siglock protected: */
|
|
unsigned long jobctl;
|
|
|
|
/* Used for emulating ABI behavior of previous Linux versions: */
|
|
unsigned int personality;
|
|
|
|
/* Scheduler bits, serialized by scheduler locks: */
|
|
unsigned sched_reset_on_fork:1;
|
|
unsigned sched_contributes_to_load:1;
|
|
unsigned sched_migrated:1;
|
|
|
|
/* Force alignment to the next boundary: */
|
|
unsigned :0;
|
|
|
|
/* Unserialized, strictly 'current' */
|
|
|
|
/*
|
|
* This field must not be in the scheduler word above due to wakelist
|
|
* queueing no longer being serialized by p->on_cpu. However:
|
|
*
|
|
* p->XXX = X; ttwu()
|
|
* schedule() if (p->on_rq && ..) // false
|
|
* smp_mb__after_spinlock(); if (smp_load_acquire(&p->on_cpu) && //true
|
|
* deactivate_task() ttwu_queue_wakelist())
|
|
* p->on_rq = 0; p->sched_remote_wakeup = Y;
|
|
*
|
|
* guarantees all stores of 'current' are visible before
|
|
* ->sched_remote_wakeup gets used, so it can be in this word.
|
|
*/
|
|
unsigned sched_remote_wakeup:1;
|
|
|
|
/* Bit to tell LSMs we're in execve(): */
|
|
unsigned in_execve:1;
|
|
unsigned in_iowait:1;
|
|
#ifndef TIF_RESTORE_SIGMASK
|
|
unsigned restore_sigmask:1;
|
|
#endif
|
|
#ifdef CONFIG_MEMCG
|
|
unsigned in_user_fault:1;
|
|
#endif
|
|
#ifdef CONFIG_LRU_GEN
|
|
/* whether the LRU algorithm may apply to this access */
|
|
unsigned in_lru_fault:1;
|
|
#endif
|
|
#ifdef CONFIG_COMPAT_BRK
|
|
unsigned brk_randomized:1;
|
|
#endif
|
|
#ifdef CONFIG_CGROUPS
|
|
/* disallow userland-initiated cgroup migration */
|
|
unsigned no_cgroup_migration:1;
|
|
/* task is frozen/stopped (used by the cgroup freezer) */
|
|
unsigned frozen:1;
|
|
#endif
|
|
#ifdef CONFIG_BLK_CGROUP
|
|
unsigned use_memdelay:1;
|
|
#endif
|
|
#ifdef CONFIG_PSI
|
|
/* Stalled due to lack of memory */
|
|
unsigned in_memstall:1;
|
|
#endif
|
|
#ifdef CONFIG_PAGE_OWNER
|
|
/* Used by page_owner=on to detect recursion in page tracking. */
|
|
unsigned in_page_owner:1;
|
|
#endif
|
|
#ifdef CONFIG_EVENTFD
|
|
/* Recursion prevention for eventfd_signal() */
|
|
unsigned in_eventfd:1;
|
|
#endif
|
|
#ifdef CONFIG_IOMMU_SVA
|
|
unsigned pasid_activated:1;
|
|
#endif
|
|
#ifdef CONFIG_CPU_SUP_INTEL
|
|
unsigned reported_split_lock:1;
|
|
#endif
|
|
#ifdef CONFIG_TASK_DELAY_ACCT
|
|
/* delay due to memory thrashing */
|
|
unsigned in_thrashing:1;
|
|
#endif
|
|
|
|
unsigned long atomic_flags; /* Flags requiring atomic access. */
|
|
|
|
struct restart_block restart_block;
|
|
|
|
pid_t pid;
|
|
pid_t tgid;
|
|
|
|
#ifdef CONFIG_STACKPROTECTOR
|
|
/* Canary value for the -fstack-protector GCC feature: */
|
|
unsigned long stack_canary;
|
|
#endif
|
|
/*
|
|
* Pointers to the (original) parent process, youngest child, younger sibling,
|
|
* older sibling, respectively. (p->father can be replaced with
|
|
* p->real_parent->pid)
|
|
*/
|
|
|
|
/* Real parent process: */
|
|
struct task_struct __rcu *real_parent;
|
|
|
|
/* Recipient of SIGCHLD, wait4() reports: */
|
|
struct task_struct __rcu *parent;
|
|
|
|
/*
|
|
* Children/sibling form the list of natural children:
|
|
*/
|
|
struct list_head children;
|
|
struct list_head sibling;
|
|
struct task_struct *group_leader;
|
|
|
|
/*
|
|
* 'ptraced' is the list of tasks this task is using ptrace() on.
|
|
*
|
|
* This includes both natural children and PTRACE_ATTACH targets.
|
|
* 'ptrace_entry' is this task's link on the p->parent->ptraced list.
|
|
*/
|
|
struct list_head ptraced;
|
|
struct list_head ptrace_entry;
|
|
|
|
/* PID/PID hash table linkage. */
|
|
struct pid *thread_pid;
|
|
struct hlist_node pid_links[PIDTYPE_MAX];
|
|
struct list_head thread_group;
|
|
struct list_head thread_node;
|
|
|
|
struct completion *vfork_done;
|
|
|
|
/* CLONE_CHILD_SETTID: */
|
|
int __user *set_child_tid;
|
|
|
|
/* CLONE_CHILD_CLEARTID: */
|
|
int __user *clear_child_tid;
|
|
|
|
/* PF_KTHREAD | PF_IO_WORKER */
|
|
void *worker_private;
|
|
|
|
u64 utime;
|
|
u64 stime;
|
|
#ifdef CONFIG_ARCH_HAS_SCALED_CPUTIME
|
|
u64 utimescaled;
|
|
u64 stimescaled;
|
|
#endif
|
|
u64 gtime;
|
|
struct prev_cputime prev_cputime;
|
|
#ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
|
|
struct vtime vtime;
|
|
#endif
|
|
|
|
#ifdef CONFIG_NO_HZ_FULL
|
|
atomic_t tick_dep_mask;
|
|
#endif
|
|
/* Context switch counts: */
|
|
unsigned long nvcsw;
|
|
unsigned long nivcsw;
|
|
|
|
/* Monotonic time in nsecs: */
|
|
u64 start_time;
|
|
|
|
/* Boot based time in nsecs: */
|
|
u64 start_boottime;
|
|
|
|
/* MM fault and swap info: this can arguably be seen as either mm-specific or thread-specific: */
|
|
unsigned long min_flt;
|
|
unsigned long maj_flt;
|
|
|
|
/* Empty if CONFIG_POSIX_CPUTIMERS=n */
|
|
struct posix_cputimers posix_cputimers;
|
|
|
|
#ifdef CONFIG_POSIX_CPU_TIMERS_TASK_WORK
|
|
struct posix_cputimers_work posix_cputimers_work;
|
|
#endif
|
|
|
|
/* Process credentials: */
|
|
|
|
/* Tracer's credentials at attach: */
|
|
const struct cred __rcu *ptracer_cred;
|
|
|
|
/* Objective and real subjective task credentials (COW): */
|
|
const struct cred __rcu *real_cred;
|
|
|
|
/* Effective (overridable) subjective task credentials (COW): */
|
|
const struct cred __rcu *cred;
|
|
|
|
#ifdef CONFIG_KEYS
|
|
/* Cached requested key. */
|
|
struct key *cached_requested_key;
|
|
#endif
|
|
|
|
/*
|
|
* executable name, excluding path.
|
|
*
|
|
* - normally initialized setup_new_exec()
|
|
* - access it with [gs]et_task_comm()
|
|
* - lock it with task_lock()
|
|
*/
|
|
char comm[TASK_COMM_LEN];
|
|
|
|
struct nameidata *nameidata;
|
|
|
|
#ifdef CONFIG_SYSVIPC
|
|
struct sysv_sem sysvsem;
|
|
struct sysv_shm sysvshm;
|
|
#endif
|
|
#ifdef CONFIG_DETECT_HUNG_TASK
|
|
unsigned long last_switch_count;
|
|
unsigned long last_switch_time;
|
|
#endif
|
|
/* Filesystem information: */
|
|
struct fs_struct *fs;
|
|
|
|
/* Open file information: */
|
|
struct files_struct *files;
|
|
|
|
#ifdef CONFIG_IO_URING
|
|
struct io_uring_task *io_uring;
|
|
#endif
|
|
|
|
/* Namespaces: */
|
|
struct nsproxy *nsproxy;
|
|
|
|
/* Signal handlers: */
|
|
struct signal_struct *signal;
|
|
struct sighand_struct __rcu *sighand;
|
|
sigset_t blocked;
|
|
sigset_t real_blocked;
|
|
/* Restored if set_restore_sigmask() was used: */
|
|
sigset_t saved_sigmask;
|
|
struct sigpending pending;
|
|
unsigned long sas_ss_sp;
|
|
size_t sas_ss_size;
|
|
unsigned int sas_ss_flags;
|
|
|
|
struct callback_head *task_works;
|
|
|
|
#ifdef CONFIG_AUDIT
|
|
#ifdef CONFIG_AUDITSYSCALL
|
|
struct audit_context *audit_context;
|
|
#endif
|
|
kuid_t loginuid;
|
|
unsigned int sessionid;
|
|
#endif
|
|
struct seccomp seccomp;
|
|
struct syscall_user_dispatch syscall_dispatch;
|
|
|
|
/* Thread group tracking: */
|
|
u64 parent_exec_id;
|
|
u64 self_exec_id;
|
|
|
|
/* Protection against (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed, mempolicy: */
|
|
spinlock_t alloc_lock;
|
|
|
|
/* Protection of the PI data structures: */
|
|
raw_spinlock_t pi_lock;
|
|
|
|
struct wake_q_node wake_q;
|
|
|
|
#ifdef CONFIG_RT_MUTEXES
|
|
/* PI waiters blocked on a rt_mutex held by this task: */
|
|
struct rb_root_cached pi_waiters;
|
|
/* Updated under owner's pi_lock and rq lock */
|
|
struct task_struct *pi_top_task;
|
|
/* Deadlock detection and priority inheritance handling: */
|
|
struct rt_mutex_waiter *pi_blocked_on;
|
|
#endif
|
|
|
|
#ifdef CONFIG_DEBUG_MUTEXES
|
|
/* Mutex deadlock detection: */
|
|
struct mutex_waiter *blocked_on;
|
|
#endif
|
|
|
|
#ifdef CONFIG_DEBUG_ATOMIC_SLEEP
|
|
int non_block_count;
|
|
#endif
|
|
|
|
#ifdef CONFIG_TRACE_IRQFLAGS
|
|
struct irqtrace_events irqtrace;
|
|
unsigned int hardirq_threaded;
|
|
u64 hardirq_chain_key;
|
|
int softirqs_enabled;
|
|
int softirq_context;
|
|
int irq_config;
|
|
#endif
|
|
#ifdef CONFIG_PREEMPT_RT
|
|
int softirq_disable_cnt;
|
|
#endif
|
|
|
|
#ifdef CONFIG_LOCKDEP
|
|
# define MAX_LOCK_DEPTH 48UL
|
|
u64 curr_chain_key;
|
|
int lockdep_depth;
|
|
unsigned int lockdep_recursion;
|
|
struct held_lock held_locks[MAX_LOCK_DEPTH];
|
|
#endif
|
|
|
|
#if defined(CONFIG_UBSAN) && !defined(CONFIG_UBSAN_TRAP)
|
|
unsigned int in_ubsan;
|
|
#endif
|
|
|
|
/* Journalling filesystem info: */
|
|
void *journal_info;
|
|
|
|
/* Stacked block device info: */
|
|
struct bio_list *bio_list;
|
|
|
|
/* Stack plugging: */
|
|
struct blk_plug *plug;
|
|
|
|
/* VM state: */
|
|
struct reclaim_state *reclaim_state;
|
|
|
|
struct backing_dev_info *backing_dev_info;
|
|
|
|
struct io_context *io_context;
|
|
|
|
#ifdef CONFIG_COMPACTION
|
|
struct capture_control *capture_control;
|
|
#endif
|
|
/* Ptrace state: */
|
|
unsigned long ptrace_message;
|
|
kernel_siginfo_t *last_siginfo;
|
|
|
|
struct task_io_accounting ioac;
|
|
#ifdef CONFIG_PSI
|
|
/* Pressure stall state */
|
|
unsigned int psi_flags;
|
|
#endif
|
|
#ifdef CONFIG_TASK_XACCT
|
|
/* Accumulated RSS usage: */
|
|
u64 acct_rss_mem1;
|
|
/* Accumulated virtual memory usage: */
|
|
u64 acct_vm_mem1;
|
|
/* stime + utime since last update: */
|
|
u64 acct_timexpd;
|
|
#endif
|
|
#ifdef CONFIG_CPUSETS
|
|
/* Protected by ->alloc_lock: */
|
|
nodemask_t mems_allowed;
|
|
/* Sequence number to catch updates: */
|
|
seqcount_spinlock_t mems_allowed_seq;
|
|
int cpuset_mem_spread_rotor;
|
|
int cpuset_slab_spread_rotor;
|
|
#endif
|
|
#ifdef CONFIG_CGROUPS
|
|
/* Control Group info protected by css_set_lock: */
|
|
struct css_set __rcu *cgroups;
|
|
/* cg_list protected by css_set_lock and tsk->alloc_lock: */
|
|
struct list_head cg_list;
|
|
#endif
|
|
#ifdef CONFIG_X86_CPU_RESCTRL
|
|
u32 closid;
|
|
u32 rmid;
|
|
#endif
|
|
#ifdef CONFIG_FUTEX
|
|
struct robust_list_head __user *robust_list;
|
|
#ifdef CONFIG_COMPAT
|
|
struct compat_robust_list_head __user *compat_robust_list;
|
|
#endif
|
|
struct list_head pi_state_list;
|
|
struct futex_pi_state *pi_state_cache;
|
|
struct mutex futex_exit_mutex;
|
|
unsigned int futex_state;
|
|
#endif
|
|
#ifdef CONFIG_PERF_EVENTS
|
|
struct perf_event_context *perf_event_ctxp;
|
|
struct mutex perf_event_mutex;
|
|
struct list_head perf_event_list;
|
|
#endif
|
|
#ifdef CONFIG_DEBUG_PREEMPT
|
|
unsigned long preempt_disable_ip;
|
|
#endif
|
|
#ifdef CONFIG_NUMA
|
|
/* Protected by alloc_lock: */
|
|
struct mempolicy *mempolicy;
|
|
short il_prev;
|
|
short pref_node_fork;
|
|
#endif
|
|
#ifdef CONFIG_NUMA_BALANCING
|
|
int numa_scan_seq;
|
|
unsigned int numa_scan_period;
|
|
unsigned int numa_scan_period_max;
|
|
int numa_preferred_nid;
|
|
unsigned long numa_migrate_retry;
|
|
/* Migration stamp: */
|
|
u64 node_stamp;
|
|
u64 last_task_numa_placement;
|
|
u64 last_sum_exec_runtime;
|
|
struct callback_head numa_work;
|
|
|
|
/*
|
|
* This pointer is only modified for current in syscall and
|
|
* pagefault context (and for tasks being destroyed), so it can be read
|
|
* from any of the following contexts:
|
|
* - RCU read-side critical section
|
|
* - current->numa_group from everywhere
|
|
* - task's runqueue locked, task not running
|
|
*/
|
|
struct numa_group __rcu *numa_group;
|
|
|
|
/*
|
|
* numa_faults is an array split into four regions:
|
|
* faults_memory, faults_cpu, faults_memory_buffer, faults_cpu_buffer
|
|
* in this precise order.
|
|
*
|
|
* faults_memory: Exponential decaying average of faults on a per-node
|
|
* basis. Scheduling placement decisions are made based on these
|
|
* counts. The values remain static for the duration of a PTE scan.
|
|
* faults_cpu: Track the nodes the process was running on when a NUMA
|
|
* hinting fault was incurred.
|
|
* faults_memory_buffer and faults_cpu_buffer: Record faults per node
|
|
* during the current scan window. When the scan completes, the counts
|
|
* in faults_memory and faults_cpu decay and these values are copied.
|
|
*/
|
|
unsigned long *numa_faults;
|
|
unsigned long total_numa_faults;
|
|
|
|
/*
|
|
* numa_faults_locality tracks if faults recorded during the last
|
|
* scan window were remote/local or failed to migrate. The task scan
|
|
* period is adapted based on the locality of the faults with different
|
|
* weights depending on whether they were shared or private faults
|
|
*/
|
|
unsigned long numa_faults_locality[3];
|
|
|
|
unsigned long numa_pages_migrated;
|
|
#endif /* CONFIG_NUMA_BALANCING */
|
|
|
|
#ifdef CONFIG_RSEQ
|
|
struct rseq __user *rseq;
|
|
u32 rseq_len;
|
|
u32 rseq_sig;
|
|
/*
|
|
* RmW on rseq_event_mask must be performed atomically
|
|
* with respect to preemption.
|
|
*/
|
|
unsigned long rseq_event_mask;
|
|
#endif
|
|
|
|
#ifdef CONFIG_SCHED_MM_CID
|
|
int mm_cid; /* Current cid in mm */
|
|
int mm_cid_active; /* Whether cid bitmap is active */
|
|
#endif
|
|
|
|
struct tlbflush_unmap_batch tlb_ubc;
|
|
|
|
union {
|
|
refcount_t rcu_users;
|
|
struct rcu_head rcu;
|
|
};
|
|
|
|
/* Cache last used pipe for splice(): */
|
|
struct pipe_inode_info *splice_pipe;
|
|
|
|
struct page_frag task_frag;
|
|
|
|
#ifdef CONFIG_TASK_DELAY_ACCT
|
|
struct task_delay_info *delays;
|
|
#endif
|
|
|
|
#ifdef CONFIG_FAULT_INJECTION
|
|
int make_it_fail;
|
|
unsigned int fail_nth;
|
|
#endif
|
|
/*
|
|
* When (nr_dirtied >= nr_dirtied_pause), it's time to call
|
|
* balance_dirty_pages() for a dirty throttling pause:
|
|
*/
|
|
int nr_dirtied;
|
|
int nr_dirtied_pause;
|
|
/* Start of a write-and-pause period: */
|
|
unsigned long dirty_paused_when;
|
|
|
|
#ifdef CONFIG_LATENCYTOP
|
|
int latency_record_count;
|
|
struct latency_record latency_record[LT_SAVECOUNT];
|
|
#endif
|
|
/*
|
|
* Time slack values; these are used to round up poll() and
|
|
* select() etc timeout values. These are in nanoseconds.
|
|
*/
|
|
u64 timer_slack_ns;
|
|
u64 default_timer_slack_ns;
|
|
|
|
#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
|
|
unsigned int kasan_depth;
|
|
#endif
|
|
|
|
#ifdef CONFIG_KCSAN
|
|
struct kcsan_ctx kcsan_ctx;
|
|
#ifdef CONFIG_TRACE_IRQFLAGS
|
|
struct irqtrace_events kcsan_save_irqtrace;
|
|
#endif
|
|
#ifdef CONFIG_KCSAN_WEAK_MEMORY
|
|
int kcsan_stack_depth;
|
|
#endif
|
|
#endif
|
|
|
|
#ifdef CONFIG_KMSAN
|
|
struct kmsan_ctx kmsan_ctx;
|
|
#endif
|
|
|
|
#if IS_ENABLED(CONFIG_KUNIT)
|
|
struct kunit *kunit_test;
|
|
#endif
|
|
|
|
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
|
/* Index of current stored address in ret_stack: */
|
|
int curr_ret_stack;
|
|
int curr_ret_depth;
|
|
|
|
/* Stack of return addresses for return function tracing: */
|
|
struct ftrace_ret_stack *ret_stack;
|
|
|
|
/* Timestamp for last schedule: */
|
|
unsigned long long ftrace_timestamp;
|
|
|
|
/*
|
|
* Number of functions that haven't been traced
|
|
* because of depth overrun:
|
|
*/
|
|
atomic_t trace_overrun;
|
|
|
|
/* Pause tracing: */
|
|
atomic_t tracing_graph_pause;
|
|
#endif
|
|
|
|
#ifdef CONFIG_TRACING
|
|
/* Bitmask and counter of trace recursion: */
|
|
unsigned long trace_recursion;
|
|
#endif /* CONFIG_TRACING */
|
|
|
|
#ifdef CONFIG_KCOV
|
|
/* See kernel/kcov.c for more details. */
|
|
|
|
/* Coverage collection mode enabled for this task (0 if disabled): */
|
|
unsigned int kcov_mode;
|
|
|
|
/* Size of the kcov_area: */
|
|
unsigned int kcov_size;
|
|
|
|
/* Buffer for coverage collection: */
|
|
void *kcov_area;
|
|
|
|
/* KCOV descriptor wired with this task or NULL: */
|
|
struct kcov *kcov;
|
|
|
|
/* KCOV common handle for remote coverage collection: */
|
|
u64 kcov_handle;
|
|
|
|
/* KCOV sequence number: */
|
|
int kcov_sequence;
|
|
|
|
/* Collect coverage from softirq context: */
|
|
unsigned int kcov_softirq;
|
|
#endif
|
|
|
|
#ifdef CONFIG_MEMCG
|
|
struct mem_cgroup *memcg_in_oom;
|
|
gfp_t memcg_oom_gfp_mask;
|
|
int memcg_oom_order;
|
|
|
|
/* Number of pages to reclaim on returning to userland: */
|
|
unsigned int memcg_nr_pages_over_high;
|
|
|
|
/* Used by memcontrol for targeted memcg charge: */
|
|
struct mem_cgroup *active_memcg;
|
|
#endif
|
|
|
|
#ifdef CONFIG_BLK_CGROUP
|
|
struct gendisk *throttle_disk;
|
|
#endif
|
|
|
|
#ifdef CONFIG_UPROBES
|
|
struct uprobe_task *utask;
|
|
#endif
|
|
#if defined(CONFIG_BCACHE) || defined(CONFIG_BCACHE_MODULE)
|
|
unsigned int sequential_io;
|
|
unsigned int sequential_io_avg;
|
|
#endif
|
|
struct kmap_ctrl kmap_ctrl;
|
|
#ifdef CONFIG_DEBUG_ATOMIC_SLEEP
|
|
unsigned long task_state_change;
|
|
# ifdef CONFIG_PREEMPT_RT
|
|
unsigned long saved_state_change;
|
|
# endif
|
|
#endif
|
|
int pagefault_disabled;
|
|
#ifdef CONFIG_MMU
|
|
struct task_struct *oom_reaper_list;
|
|
struct timer_list oom_reaper_timer;
|
|
#endif
|
|
#ifdef CONFIG_VMAP_STACK
|
|
struct vm_struct *stack_vm_area;
|
|
#endif
|
|
#ifdef CONFIG_THREAD_INFO_IN_TASK
|
|
/* A live task holds one reference: */
|
|
refcount_t stack_refcount;
|
|
#endif
|
|
#ifdef CONFIG_LIVEPATCH
|
|
int patch_state;
|
|
#endif
|
|
#ifdef CONFIG_SECURITY
|
|
/* Used by LSM modules for access restriction: */
|
|
void *security;
|
|
#endif
|
|
#ifdef CONFIG_BPF_SYSCALL
|
|
/* Used by BPF task local storage */
|
|
struct bpf_local_storage __rcu *bpf_storage;
|
|
/* Used for BPF run context */
|
|
struct bpf_run_ctx *bpf_ctx;
|
|
#endif
|
|
|
|
#ifdef CONFIG_GCC_PLUGIN_STACKLEAK
|
|
unsigned long lowest_stack;
|
|
unsigned long prev_lowest_stack;
|
|
#endif
|
|
|
|
#ifdef CONFIG_X86_MCE
|
|
void __user *mce_vaddr;
|
|
__u64 mce_kflags;
|
|
u64 mce_addr;
|
|
__u64 mce_ripv : 1,
|
|
mce_whole_page : 1,
|
|
__mce_reserved : 62;
|
|
struct callback_head mce_kill_me;
|
|
int mce_count;
|
|
#endif
|
|
|
|
#ifdef CONFIG_KRETPROBES
|
|
struct llist_head kretprobe_instances;
|
|
#endif
|
|
#ifdef CONFIG_RETHOOK
|
|
struct llist_head rethooks;
|
|
#endif
|
|
|
|
#ifdef CONFIG_ARCH_HAS_PARANOID_L1D_FLUSH
|
|
/*
|
|
* If L1D flush is supported on mm context switch
|
|
* then we use this callback head to queue kill work
|
|
* to kill tasks that are not running on SMT disabled
|
|
* cores
|
|
*/
|
|
struct callback_head l1d_flush_kill;
|
|
#endif
|
|
|
|
#ifdef CONFIG_RV
|
|
/*
|
|
* Per-task RV monitor. Nowadays fixed in RV_PER_TASK_MONITORS.
|
|
* If we find justification for more monitors, we can think
|
|
* about adding more or developing a dynamic method. So far,
|
|
* none of these are justified.
|
|
*/
|
|
union rv_task_monitor rv[RV_PER_TASK_MONITORS];
|
|
#endif
|
|
|
|
/*
|
|
* New fields for task_struct should be added above here, so that
|
|
* they are included in the randomized portion of task_struct.
|
|
*/
|
|
randomized_struct_fields_end
|
|
|
|
/* CPU-specific state of this task: */
|
|
struct thread_struct thread;
|
|
|
|
/*
|
|
* WARNING: on x86, 'thread_struct' contains a variable-sized
|
|
* structure. It *MUST* be at the end of 'task_struct'.
|
|
*
|
|
* Do not put anything below here!
|
|
*/
|
|
};
|
|
|
|
#ifdef CONFIG_SCHED_ALT
|
|
#define tsk_seruntime(t) ((t)->sched_time)
|
|
/* replace the uncertian rt_timeout with 0UL */
|
|
#define tsk_rttimeout(t) (0UL)
|
|
#else /* CFS */
|
|
#define tsk_seruntime(t) ((t)->se.sum_exec_runtime)
|
|
#define tsk_rttimeout(t) ((t)->rt.timeout)
|
|
#endif /* !CONFIG_SCHED_ALT */
|
|
|
|
static inline struct pid *task_pid(struct task_struct *task)
|
|
{
|
|
return task->thread_pid;
|
|
}
|
|
|
|
/*
|
|
* the helpers to get the task's different pids as they are seen
|
|
* from various namespaces
|
|
*
|
|
* task_xid_nr() : global id, i.e. the id seen from the init namespace;
|
|
* task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of
|
|
* current.
|
|
* task_xid_nr_ns() : id seen from the ns specified;
|
|
*
|
|
* see also pid_nr() etc in include/linux/pid.h
|
|
*/
|
|
pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type, struct pid_namespace *ns);
|
|
|
|
static inline pid_t task_pid_nr(struct task_struct *tsk)
|
|
{
|
|
return tsk->pid;
|
|
}
|
|
|
|
static inline pid_t task_pid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns)
|
|
{
|
|
return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns);
|
|
}
|
|
|
|
static inline pid_t task_pid_vnr(struct task_struct *tsk)
|
|
{
|
|
return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL);
|
|
}
|
|
|
|
|
|
static inline pid_t task_tgid_nr(struct task_struct *tsk)
|
|
{
|
|
return tsk->tgid;
|
|
}
|
|
|
|
/**
|
|
* pid_alive - check that a task structure is not stale
|
|
* @p: Task structure to be checked.
|
|
*
|
|
* Test if a process is not yet dead (at most zombie state)
|
|
* If pid_alive fails, then pointers within the task structure
|
|
* can be stale and must not be dereferenced.
|
|
*
|
|
* Return: 1 if the process is alive. 0 otherwise.
|
|
*/
|
|
static inline int pid_alive(const struct task_struct *p)
|
|
{
|
|
return p->thread_pid != NULL;
|
|
}
|
|
|
|
static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk, struct pid_namespace *ns)
|
|
{
|
|
return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns);
|
|
}
|
|
|
|
static inline pid_t task_pgrp_vnr(struct task_struct *tsk)
|
|
{
|
|
return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL);
|
|
}
|
|
|
|
|
|
static inline pid_t task_session_nr_ns(struct task_struct *tsk, struct pid_namespace *ns)
|
|
{
|
|
return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns);
|
|
}
|
|
|
|
static inline pid_t task_session_vnr(struct task_struct *tsk)
|
|
{
|
|
return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL);
|
|
}
|
|
|
|
static inline pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns)
|
|
{
|
|
return __task_pid_nr_ns(tsk, PIDTYPE_TGID, ns);
|
|
}
|
|
|
|
static inline pid_t task_tgid_vnr(struct task_struct *tsk)
|
|
{
|
|
return __task_pid_nr_ns(tsk, PIDTYPE_TGID, NULL);
|
|
}
|
|
|
|
static inline pid_t task_ppid_nr_ns(const struct task_struct *tsk, struct pid_namespace *ns)
|
|
{
|
|
pid_t pid = 0;
|
|
|
|
rcu_read_lock();
|
|
if (pid_alive(tsk))
|
|
pid = task_tgid_nr_ns(rcu_dereference(tsk->real_parent), ns);
|
|
rcu_read_unlock();
|
|
|
|
return pid;
|
|
}
|
|
|
|
static inline pid_t task_ppid_nr(const struct task_struct *tsk)
|
|
{
|
|
return task_ppid_nr_ns(tsk, &init_pid_ns);
|
|
}
|
|
|
|
/* Obsolete, do not use: */
|
|
static inline pid_t task_pgrp_nr(struct task_struct *tsk)
|
|
{
|
|
return task_pgrp_nr_ns(tsk, &init_pid_ns);
|
|
}
|
|
|
|
#define TASK_REPORT_IDLE (TASK_REPORT + 1)
|
|
#define TASK_REPORT_MAX (TASK_REPORT_IDLE << 1)
|
|
|
|
static inline unsigned int __task_state_index(unsigned int tsk_state,
|
|
unsigned int tsk_exit_state)
|
|
{
|
|
unsigned int state = (tsk_state | tsk_exit_state) & TASK_REPORT;
|
|
|
|
BUILD_BUG_ON_NOT_POWER_OF_2(TASK_REPORT_MAX);
|
|
|
|
if (tsk_state == TASK_IDLE)
|
|
state = TASK_REPORT_IDLE;
|
|
|
|
/*
|
|
* We're lying here, but rather than expose a completely new task state
|
|
* to userspace, we can make this appear as if the task has gone through
|
|
* a regular rt_mutex_lock() call.
|
|
*/
|
|
if (tsk_state == TASK_RTLOCK_WAIT)
|
|
state = TASK_UNINTERRUPTIBLE;
|
|
|
|
return fls(state);
|
|
}
|
|
|
|
static inline unsigned int task_state_index(struct task_struct *tsk)
|
|
{
|
|
return __task_state_index(READ_ONCE(tsk->__state), tsk->exit_state);
|
|
}
|
|
|
|
static inline char task_index_to_char(unsigned int state)
|
|
{
|
|
static const char state_char[] = "RSDTtXZPI";
|
|
|
|
BUILD_BUG_ON(1 + ilog2(TASK_REPORT_MAX) != sizeof(state_char) - 1);
|
|
|
|
return state_char[state];
|
|
}
|
|
|
|
static inline char task_state_to_char(struct task_struct *tsk)
|
|
{
|
|
return task_index_to_char(task_state_index(tsk));
|
|
}
|
|
|
|
/**
|
|
* is_global_init - check if a task structure is init. Since init
|
|
* is free to have sub-threads we need to check tgid.
|
|
* @tsk: Task structure to be checked.
|
|
*
|
|
* Check if a task structure is the first user space task the kernel created.
|
|
*
|
|
* Return: 1 if the task structure is init. 0 otherwise.
|
|
*/
|
|
static inline int is_global_init(struct task_struct *tsk)
|
|
{
|
|
return task_tgid_nr(tsk) == 1;
|
|
}
|
|
|
|
extern struct pid *cad_pid;
|
|
|
|
/*
|
|
* Per process flags
|
|
*/
|
|
#define PF_VCPU 0x00000001 /* I'm a virtual CPU */
|
|
#define PF_IDLE 0x00000002 /* I am an IDLE thread */
|
|
#define PF_EXITING 0x00000004 /* Getting shut down */
|
|
#define PF_POSTCOREDUMP 0x00000008 /* Coredumps should ignore this task */
|
|
#define PF_IO_WORKER 0x00000010 /* Task is an IO worker */
|
|
#define PF_WQ_WORKER 0x00000020 /* I'm a workqueue worker */
|
|
#define PF_FORKNOEXEC 0x00000040 /* Forked but didn't exec */
|
|
#define PF_MCE_PROCESS 0x00000080 /* Process policy on mce errors */
|
|
#define PF_SUPERPRIV 0x00000100 /* Used super-user privileges */
|
|
#define PF_DUMPCORE 0x00000200 /* Dumped core */
|
|
#define PF_SIGNALED 0x00000400 /* Killed by a signal */
|
|
#define PF_MEMALLOC 0x00000800 /* Allocating memory */
|
|
#define PF_NPROC_EXCEEDED 0x00001000 /* set_user() noticed that RLIMIT_NPROC was exceeded */
|
|
#define PF_USED_MATH 0x00002000 /* If unset the fpu must be initialized before use */
|
|
#define PF__HOLE__00004000 0x00004000
|
|
#define PF_NOFREEZE 0x00008000 /* This thread should not be frozen */
|
|
#define PF__HOLE__00010000 0x00010000
|
|
#define PF_KSWAPD 0x00020000 /* I am kswapd */
|
|
#define PF_MEMALLOC_NOFS 0x00040000 /* All allocation requests will inherit GFP_NOFS */
|
|
#define PF_MEMALLOC_NOIO 0x00080000 /* All allocation requests will inherit GFP_NOIO */
|
|
#define PF_LOCAL_THROTTLE 0x00100000 /* Throttle writes only against the bdi I write to,
|
|
* I am cleaning dirty pages from some other bdi. */
|
|
#define PF_KTHREAD 0x00200000 /* I am a kernel thread */
|
|
#define PF_RANDOMIZE 0x00400000 /* Randomize virtual address space */
|
|
#define PF__HOLE__00800000 0x00800000
|
|
#define PF__HOLE__01000000 0x01000000
|
|
#define PF__HOLE__02000000 0x02000000
|
|
#define PF_NO_SETAFFINITY 0x04000000 /* Userland is not allowed to meddle with cpus_mask */
|
|
#define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */
|
|
#define PF_MEMALLOC_PIN 0x10000000 /* Allocation context constrained to zones which allow long term pinning. */
|
|
#define PF__HOLE__20000000 0x20000000
|
|
#define PF__HOLE__40000000 0x40000000
|
|
#define PF_SUSPEND_TASK 0x80000000 /* This thread called freeze_processes() and should not be frozen */
|
|
|
|
/*
|
|
* Only the _current_ task can read/write to tsk->flags, but other
|
|
* tasks can access tsk->flags in readonly mode for example
|
|
* with tsk_used_math (like during threaded core dumping).
|
|
* There is however an exception to this rule during ptrace
|
|
* or during fork: the ptracer task is allowed to write to the
|
|
* child->flags of its traced child (same goes for fork, the parent
|
|
* can write to the child->flags), because we're guaranteed the
|
|
* child is not running and in turn not changing child->flags
|
|
* at the same time the parent does it.
|
|
*/
|
|
#define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
|
|
#define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
|
|
#define clear_used_math() clear_stopped_child_used_math(current)
|
|
#define set_used_math() set_stopped_child_used_math(current)
|
|
|
|
#define conditional_stopped_child_used_math(condition, child) \
|
|
do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
|
|
|
|
#define conditional_used_math(condition) conditional_stopped_child_used_math(condition, current)
|
|
|
|
#define copy_to_stopped_child_used_math(child) \
|
|
do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
|
|
|
|
/* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
|
|
#define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
|
|
#define used_math() tsk_used_math(current)
|
|
|
|
static __always_inline bool is_percpu_thread(void)
|
|
{
|
|
#ifdef CONFIG_SMP
|
|
return (current->flags & PF_NO_SETAFFINITY) &&
|
|
(current->nr_cpus_allowed == 1);
|
|
#else
|
|
return true;
|
|
#endif
|
|
}
|
|
|
|
/* Per-process atomic flags. */
|
|
#define PFA_NO_NEW_PRIVS 0 /* May not gain new privileges. */
|
|
#define PFA_SPREAD_PAGE 1 /* Spread page cache over cpuset */
|
|
#define PFA_SPREAD_SLAB 2 /* Spread some slab caches over cpuset */
|
|
#define PFA_SPEC_SSB_DISABLE 3 /* Speculative Store Bypass disabled */
|
|
#define PFA_SPEC_SSB_FORCE_DISABLE 4 /* Speculative Store Bypass force disabled*/
|
|
#define PFA_SPEC_IB_DISABLE 5 /* Indirect branch speculation restricted */
|
|
#define PFA_SPEC_IB_FORCE_DISABLE 6 /* Indirect branch speculation permanently restricted */
|
|
#define PFA_SPEC_SSB_NOEXEC 7 /* Speculative Store Bypass clear on execve() */
|
|
|
|
#define TASK_PFA_TEST(name, func) \
|
|
static inline bool task_##func(struct task_struct *p) \
|
|
{ return test_bit(PFA_##name, &p->atomic_flags); }
|
|
|
|
#define TASK_PFA_SET(name, func) \
|
|
static inline void task_set_##func(struct task_struct *p) \
|
|
{ set_bit(PFA_##name, &p->atomic_flags); }
|
|
|
|
#define TASK_PFA_CLEAR(name, func) \
|
|
static inline void task_clear_##func(struct task_struct *p) \
|
|
{ clear_bit(PFA_##name, &p->atomic_flags); }
|
|
|
|
TASK_PFA_TEST(NO_NEW_PRIVS, no_new_privs)
|
|
TASK_PFA_SET(NO_NEW_PRIVS, no_new_privs)
|
|
|
|
TASK_PFA_TEST(SPREAD_PAGE, spread_page)
|
|
TASK_PFA_SET(SPREAD_PAGE, spread_page)
|
|
TASK_PFA_CLEAR(SPREAD_PAGE, spread_page)
|
|
|
|
TASK_PFA_TEST(SPREAD_SLAB, spread_slab)
|
|
TASK_PFA_SET(SPREAD_SLAB, spread_slab)
|
|
TASK_PFA_CLEAR(SPREAD_SLAB, spread_slab)
|
|
|
|
TASK_PFA_TEST(SPEC_SSB_DISABLE, spec_ssb_disable)
|
|
TASK_PFA_SET(SPEC_SSB_DISABLE, spec_ssb_disable)
|
|
TASK_PFA_CLEAR(SPEC_SSB_DISABLE, spec_ssb_disable)
|
|
|
|
TASK_PFA_TEST(SPEC_SSB_NOEXEC, spec_ssb_noexec)
|
|
TASK_PFA_SET(SPEC_SSB_NOEXEC, spec_ssb_noexec)
|
|
TASK_PFA_CLEAR(SPEC_SSB_NOEXEC, spec_ssb_noexec)
|
|
|
|
TASK_PFA_TEST(SPEC_SSB_FORCE_DISABLE, spec_ssb_force_disable)
|
|
TASK_PFA_SET(SPEC_SSB_FORCE_DISABLE, spec_ssb_force_disable)
|
|
|
|
TASK_PFA_TEST(SPEC_IB_DISABLE, spec_ib_disable)
|
|
TASK_PFA_SET(SPEC_IB_DISABLE, spec_ib_disable)
|
|
TASK_PFA_CLEAR(SPEC_IB_DISABLE, spec_ib_disable)
|
|
|
|
TASK_PFA_TEST(SPEC_IB_FORCE_DISABLE, spec_ib_force_disable)
|
|
TASK_PFA_SET(SPEC_IB_FORCE_DISABLE, spec_ib_force_disable)
|
|
|
|
static inline void
|
|
current_restore_flags(unsigned long orig_flags, unsigned long flags)
|
|
{
|
|
current->flags &= ~flags;
|
|
current->flags |= orig_flags & flags;
|
|
}
|
|
|
|
extern int cpuset_cpumask_can_shrink(const struct cpumask *cur, const struct cpumask *trial);
|
|
extern int task_can_attach(struct task_struct *p, const struct cpumask *cs_effective_cpus);
|
|
#ifdef CONFIG_SMP
|
|
extern void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask);
|
|
extern int set_cpus_allowed_ptr(struct task_struct *p, const struct cpumask *new_mask);
|
|
extern int dup_user_cpus_ptr(struct task_struct *dst, struct task_struct *src, int node);
|
|
extern void release_user_cpus_ptr(struct task_struct *p);
|
|
extern int dl_task_check_affinity(struct task_struct *p, const struct cpumask *mask);
|
|
extern void force_compatible_cpus_allowed_ptr(struct task_struct *p);
|
|
extern void relax_compatible_cpus_allowed_ptr(struct task_struct *p);
|
|
#else
|
|
static inline void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask)
|
|
{
|
|
}
|
|
static inline int set_cpus_allowed_ptr(struct task_struct *p, const struct cpumask *new_mask)
|
|
{
|
|
if (!cpumask_test_cpu(0, new_mask))
|
|
return -EINVAL;
|
|
return 0;
|
|
}
|
|
static inline int dup_user_cpus_ptr(struct task_struct *dst, struct task_struct *src, int node)
|
|
{
|
|
if (src->user_cpus_ptr)
|
|
return -EINVAL;
|
|
return 0;
|
|
}
|
|
static inline void release_user_cpus_ptr(struct task_struct *p)
|
|
{
|
|
WARN_ON(p->user_cpus_ptr);
|
|
}
|
|
|
|
static inline int dl_task_check_affinity(struct task_struct *p, const struct cpumask *mask)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
extern int yield_to(struct task_struct *p, bool preempt);
|
|
extern void set_user_nice(struct task_struct *p, long nice);
|
|
extern int task_prio(const struct task_struct *p);
|
|
|
|
/**
|
|
* task_nice - return the nice value of a given task.
|
|
* @p: the task in question.
|
|
*
|
|
* Return: The nice value [ -20 ... 0 ... 19 ].
|
|
*/
|
|
static inline int task_nice(const struct task_struct *p)
|
|
{
|
|
return PRIO_TO_NICE((p)->static_prio);
|
|
}
|
|
|
|
extern int can_nice(const struct task_struct *p, const int nice);
|
|
extern int task_curr(const struct task_struct *p);
|
|
extern int idle_cpu(int cpu);
|
|
extern int available_idle_cpu(int cpu);
|
|
extern int sched_setscheduler(struct task_struct *, int, const struct sched_param *);
|
|
extern int sched_setscheduler_nocheck(struct task_struct *, int, const struct sched_param *);
|
|
extern void sched_set_fifo(struct task_struct *p);
|
|
extern void sched_set_fifo_low(struct task_struct *p);
|
|
extern void sched_set_normal(struct task_struct *p, int nice);
|
|
extern int sched_setattr(struct task_struct *, const struct sched_attr *);
|
|
extern int sched_setattr_nocheck(struct task_struct *, const struct sched_attr *);
|
|
extern struct task_struct *idle_task(int cpu);
|
|
|
|
/**
|
|
* is_idle_task - is the specified task an idle task?
|
|
* @p: the task in question.
|
|
*
|
|
* Return: 1 if @p is an idle task. 0 otherwise.
|
|
*/
|
|
static __always_inline bool is_idle_task(const struct task_struct *p)
|
|
{
|
|
return !!(p->flags & PF_IDLE);
|
|
}
|
|
|
|
extern struct task_struct *curr_task(int cpu);
|
|
extern void ia64_set_curr_task(int cpu, struct task_struct *p);
|
|
|
|
void yield(void);
|
|
|
|
union thread_union {
|
|
#ifndef CONFIG_ARCH_TASK_STRUCT_ON_STACK
|
|
struct task_struct task;
|
|
#endif
|
|
#ifndef CONFIG_THREAD_INFO_IN_TASK
|
|
struct thread_info thread_info;
|
|
#endif
|
|
unsigned long stack[THREAD_SIZE/sizeof(long)];
|
|
};
|
|
|
|
#ifndef CONFIG_THREAD_INFO_IN_TASK
|
|
extern struct thread_info init_thread_info;
|
|
#endif
|
|
|
|
extern unsigned long init_stack[THREAD_SIZE / sizeof(unsigned long)];
|
|
|
|
#ifdef CONFIG_THREAD_INFO_IN_TASK
|
|
# define task_thread_info(task) (&(task)->thread_info)
|
|
#elif !defined(__HAVE_THREAD_FUNCTIONS)
|
|
# define task_thread_info(task) ((struct thread_info *)(task)->stack)
|
|
#endif
|
|
|
|
/*
|
|
* find a task by one of its numerical ids
|
|
*
|
|
* find_task_by_pid_ns():
|
|
* finds a task by its pid in the specified namespace
|
|
* find_task_by_vpid():
|
|
* finds a task by its virtual pid
|
|
*
|
|
* see also find_vpid() etc in include/linux/pid.h
|
|
*/
|
|
|
|
extern struct task_struct *find_task_by_vpid(pid_t nr);
|
|
extern struct task_struct *find_task_by_pid_ns(pid_t nr, struct pid_namespace *ns);
|
|
|
|
/*
|
|
* find a task by its virtual pid and get the task struct
|
|
*/
|
|
extern struct task_struct *find_get_task_by_vpid(pid_t nr);
|
|
|
|
extern int wake_up_state(struct task_struct *tsk, unsigned int state);
|
|
extern int wake_up_process(struct task_struct *tsk);
|
|
extern void wake_up_new_task(struct task_struct *tsk);
|
|
|
|
#ifdef CONFIG_SMP
|
|
extern void kick_process(struct task_struct *tsk);
|
|
#else
|
|
static inline void kick_process(struct task_struct *tsk) { }
|
|
#endif
|
|
|
|
extern void __set_task_comm(struct task_struct *tsk, const char *from, bool exec);
|
|
|
|
static inline void set_task_comm(struct task_struct *tsk, const char *from)
|
|
{
|
|
__set_task_comm(tsk, from, false);
|
|
}
|
|
|
|
extern char *__get_task_comm(char *to, size_t len, struct task_struct *tsk);
|
|
#define get_task_comm(buf, tsk) ({ \
|
|
BUILD_BUG_ON(sizeof(buf) != TASK_COMM_LEN); \
|
|
__get_task_comm(buf, sizeof(buf), tsk); \
|
|
})
|
|
|
|
#ifdef CONFIG_SMP
|
|
static __always_inline void scheduler_ipi(void)
|
|
{
|
|
/*
|
|
* Fold TIF_NEED_RESCHED into the preempt_count; anybody setting
|
|
* TIF_NEED_RESCHED remotely (for the first time) will also send
|
|
* this IPI.
|
|
*/
|
|
preempt_fold_need_resched();
|
|
}
|
|
extern unsigned long wait_task_inactive(struct task_struct *, unsigned int match_state);
|
|
#else
|
|
static inline void scheduler_ipi(void) { }
|
|
static inline unsigned long wait_task_inactive(struct task_struct *p, unsigned int match_state)
|
|
{
|
|
return 1;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Set thread flags in other task's structures.
|
|
* See asm/thread_info.h for TIF_xxxx flags available:
|
|
*/
|
|
static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
|
|
{
|
|
set_ti_thread_flag(task_thread_info(tsk), flag);
|
|
}
|
|
|
|
static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
|
|
{
|
|
clear_ti_thread_flag(task_thread_info(tsk), flag);
|
|
}
|
|
|
|
static inline void update_tsk_thread_flag(struct task_struct *tsk, int flag,
|
|
bool value)
|
|
{
|
|
update_ti_thread_flag(task_thread_info(tsk), flag, value);
|
|
}
|
|
|
|
static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
|
|
{
|
|
return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
|
|
}
|
|
|
|
static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
|
|
{
|
|
return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
|
|
}
|
|
|
|
static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
|
|
{
|
|
return test_ti_thread_flag(task_thread_info(tsk), flag);
|
|
}
|
|
|
|
static inline void set_tsk_need_resched(struct task_struct *tsk)
|
|
{
|
|
set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
|
|
}
|
|
|
|
static inline void clear_tsk_need_resched(struct task_struct *tsk)
|
|
{
|
|
clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
|
|
}
|
|
|
|
static inline int test_tsk_need_resched(struct task_struct *tsk)
|
|
{
|
|
return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED));
|
|
}
|
|
|
|
/*
|
|
* cond_resched() and cond_resched_lock(): latency reduction via
|
|
* explicit rescheduling in places that are safe. The return
|
|
* value indicates whether a reschedule was done in fact.
|
|
* cond_resched_lock() will drop the spinlock before scheduling,
|
|
*/
|
|
#if !defined(CONFIG_PREEMPTION) || defined(CONFIG_PREEMPT_DYNAMIC)
|
|
extern int __cond_resched(void);
|
|
|
|
#if defined(CONFIG_PREEMPT_DYNAMIC) && defined(CONFIG_HAVE_PREEMPT_DYNAMIC_CALL)
|
|
|
|
DECLARE_STATIC_CALL(cond_resched, __cond_resched);
|
|
|
|
static __always_inline int _cond_resched(void)
|
|
{
|
|
return static_call_mod(cond_resched)();
|
|
}
|
|
|
|
#elif defined(CONFIG_PREEMPT_DYNAMIC) && defined(CONFIG_HAVE_PREEMPT_DYNAMIC_KEY)
|
|
extern int dynamic_cond_resched(void);
|
|
|
|
static __always_inline int _cond_resched(void)
|
|
{
|
|
return dynamic_cond_resched();
|
|
}
|
|
|
|
#else
|
|
|
|
static inline int _cond_resched(void)
|
|
{
|
|
return __cond_resched();
|
|
}
|
|
|
|
#endif /* CONFIG_PREEMPT_DYNAMIC */
|
|
|
|
#else
|
|
|
|
static inline int _cond_resched(void) { return 0; }
|
|
|
|
#endif /* !defined(CONFIG_PREEMPTION) || defined(CONFIG_PREEMPT_DYNAMIC) */
|
|
|
|
#define cond_resched() ({ \
|
|
__might_resched(__FILE__, __LINE__, 0); \
|
|
_cond_resched(); \
|
|
})
|
|
|
|
extern int __cond_resched_lock(spinlock_t *lock);
|
|
extern int __cond_resched_rwlock_read(rwlock_t *lock);
|
|
extern int __cond_resched_rwlock_write(rwlock_t *lock);
|
|
|
|
#define MIGHT_RESCHED_RCU_SHIFT 8
|
|
#define MIGHT_RESCHED_PREEMPT_MASK ((1U << MIGHT_RESCHED_RCU_SHIFT) - 1)
|
|
|
|
#ifndef CONFIG_PREEMPT_RT
|
|
/*
|
|
* Non RT kernels have an elevated preempt count due to the held lock,
|
|
* but are not allowed to be inside a RCU read side critical section
|
|
*/
|
|
# define PREEMPT_LOCK_RESCHED_OFFSETS PREEMPT_LOCK_OFFSET
|
|
#else
|
|
/*
|
|
* spin/rw_lock() on RT implies rcu_read_lock(). The might_sleep() check in
|
|
* cond_resched*lock() has to take that into account because it checks for
|
|
* preempt_count() and rcu_preempt_depth().
|
|
*/
|
|
# define PREEMPT_LOCK_RESCHED_OFFSETS \
|
|
(PREEMPT_LOCK_OFFSET + (1U << MIGHT_RESCHED_RCU_SHIFT))
|
|
#endif
|
|
|
|
#define cond_resched_lock(lock) ({ \
|
|
__might_resched(__FILE__, __LINE__, PREEMPT_LOCK_RESCHED_OFFSETS); \
|
|
__cond_resched_lock(lock); \
|
|
})
|
|
|
|
#define cond_resched_rwlock_read(lock) ({ \
|
|
__might_resched(__FILE__, __LINE__, PREEMPT_LOCK_RESCHED_OFFSETS); \
|
|
__cond_resched_rwlock_read(lock); \
|
|
})
|
|
|
|
#define cond_resched_rwlock_write(lock) ({ \
|
|
__might_resched(__FILE__, __LINE__, PREEMPT_LOCK_RESCHED_OFFSETS); \
|
|
__cond_resched_rwlock_write(lock); \
|
|
})
|
|
|
|
static inline void cond_resched_rcu(void)
|
|
{
|
|
#if defined(CONFIG_DEBUG_ATOMIC_SLEEP) || !defined(CONFIG_PREEMPT_RCU)
|
|
rcu_read_unlock();
|
|
cond_resched();
|
|
rcu_read_lock();
|
|
#endif
|
|
}
|
|
|
|
#ifdef CONFIG_PREEMPT_DYNAMIC
|
|
|
|
extern bool preempt_model_none(void);
|
|
extern bool preempt_model_voluntary(void);
|
|
extern bool preempt_model_full(void);
|
|
|
|
#else
|
|
|
|
static inline bool preempt_model_none(void)
|
|
{
|
|
return IS_ENABLED(CONFIG_PREEMPT_NONE);
|
|
}
|
|
static inline bool preempt_model_voluntary(void)
|
|
{
|
|
return IS_ENABLED(CONFIG_PREEMPT_VOLUNTARY);
|
|
}
|
|
static inline bool preempt_model_full(void)
|
|
{
|
|
return IS_ENABLED(CONFIG_PREEMPT);
|
|
}
|
|
|
|
#endif
|
|
|
|
static inline bool preempt_model_rt(void)
|
|
{
|
|
return IS_ENABLED(CONFIG_PREEMPT_RT);
|
|
}
|
|
|
|
/*
|
|
* Does the preemption model allow non-cooperative preemption?
|
|
*
|
|
* For !CONFIG_PREEMPT_DYNAMIC kernels this is an exact match with
|
|
* CONFIG_PREEMPTION; for CONFIG_PREEMPT_DYNAMIC this doesn't work as the
|
|
* kernel is *built* with CONFIG_PREEMPTION=y but may run with e.g. the
|
|
* PREEMPT_NONE model.
|
|
*/
|
|
static inline bool preempt_model_preemptible(void)
|
|
{
|
|
return preempt_model_full() || preempt_model_rt();
|
|
}
|
|
|
|
/*
|
|
* Does a critical section need to be broken due to another
|
|
* task waiting?: (technically does not depend on CONFIG_PREEMPTION,
|
|
* but a general need for low latency)
|
|
*/
|
|
static inline int spin_needbreak(spinlock_t *lock)
|
|
{
|
|
#ifdef CONFIG_PREEMPTION
|
|
return spin_is_contended(lock);
|
|
#else
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Check if a rwlock is contended.
|
|
* Returns non-zero if there is another task waiting on the rwlock.
|
|
* Returns zero if the lock is not contended or the system / underlying
|
|
* rwlock implementation does not support contention detection.
|
|
* Technically does not depend on CONFIG_PREEMPTION, but a general need
|
|
* for low latency.
|
|
*/
|
|
static inline int rwlock_needbreak(rwlock_t *lock)
|
|
{
|
|
#ifdef CONFIG_PREEMPTION
|
|
return rwlock_is_contended(lock);
|
|
#else
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
static __always_inline bool need_resched(void)
|
|
{
|
|
return unlikely(tif_need_resched());
|
|
}
|
|
|
|
/*
|
|
* Wrappers for p->thread_info->cpu access. No-op on UP.
|
|
*/
|
|
#ifdef CONFIG_SMP
|
|
|
|
static inline unsigned int task_cpu(const struct task_struct *p)
|
|
{
|
|
return READ_ONCE(task_thread_info(p)->cpu);
|
|
}
|
|
|
|
extern void set_task_cpu(struct task_struct *p, unsigned int cpu);
|
|
|
|
#else
|
|
|
|
static inline unsigned int task_cpu(const struct task_struct *p)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
|
|
{
|
|
}
|
|
|
|
#endif /* CONFIG_SMP */
|
|
|
|
extern bool sched_task_on_rq(struct task_struct *p);
|
|
extern unsigned long get_wchan(struct task_struct *p);
|
|
extern struct task_struct *cpu_curr_snapshot(int cpu);
|
|
|
|
/*
|
|
* In order to reduce various lock holder preemption latencies provide an
|
|
* interface to see if a vCPU is currently running or not.
|
|
*
|
|
* This allows us to terminate optimistic spin loops and block, analogous to
|
|
* the native optimistic spin heuristic of testing if the lock owner task is
|
|
* running or not.
|
|
*/
|
|
#ifndef vcpu_is_preempted
|
|
static inline bool vcpu_is_preempted(int cpu)
|
|
{
|
|
return false;
|
|
}
|
|
#endif
|
|
|
|
extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask);
|
|
extern long sched_getaffinity(pid_t pid, struct cpumask *mask);
|
|
|
|
#ifndef TASK_SIZE_OF
|
|
#define TASK_SIZE_OF(tsk) TASK_SIZE
|
|
#endif
|
|
|
|
#ifdef CONFIG_SMP
|
|
static inline bool owner_on_cpu(struct task_struct *owner)
|
|
{
|
|
/*
|
|
* As lock holder preemption issue, we both skip spinning if
|
|
* task is not on cpu or its cpu is preempted
|
|
*/
|
|
return READ_ONCE(owner->on_cpu) && !vcpu_is_preempted(task_cpu(owner));
|
|
}
|
|
|
|
/* Returns effective CPU energy utilization, as seen by the scheduler */
|
|
unsigned long sched_cpu_util(int cpu);
|
|
#endif /* CONFIG_SMP */
|
|
|
|
#ifdef CONFIG_RSEQ
|
|
|
|
/*
|
|
* Map the event mask on the user-space ABI enum rseq_cs_flags
|
|
* for direct mask checks.
|
|
*/
|
|
enum rseq_event_mask_bits {
|
|
RSEQ_EVENT_PREEMPT_BIT = RSEQ_CS_FLAG_NO_RESTART_ON_PREEMPT_BIT,
|
|
RSEQ_EVENT_SIGNAL_BIT = RSEQ_CS_FLAG_NO_RESTART_ON_SIGNAL_BIT,
|
|
RSEQ_EVENT_MIGRATE_BIT = RSEQ_CS_FLAG_NO_RESTART_ON_MIGRATE_BIT,
|
|
};
|
|
|
|
enum rseq_event_mask {
|
|
RSEQ_EVENT_PREEMPT = (1U << RSEQ_EVENT_PREEMPT_BIT),
|
|
RSEQ_EVENT_SIGNAL = (1U << RSEQ_EVENT_SIGNAL_BIT),
|
|
RSEQ_EVENT_MIGRATE = (1U << RSEQ_EVENT_MIGRATE_BIT),
|
|
};
|
|
|
|
static inline void rseq_set_notify_resume(struct task_struct *t)
|
|
{
|
|
if (t->rseq)
|
|
set_tsk_thread_flag(t, TIF_NOTIFY_RESUME);
|
|
}
|
|
|
|
void __rseq_handle_notify_resume(struct ksignal *sig, struct pt_regs *regs);
|
|
|
|
static inline void rseq_handle_notify_resume(struct ksignal *ksig,
|
|
struct pt_regs *regs)
|
|
{
|
|
if (current->rseq)
|
|
__rseq_handle_notify_resume(ksig, regs);
|
|
}
|
|
|
|
static inline void rseq_signal_deliver(struct ksignal *ksig,
|
|
struct pt_regs *regs)
|
|
{
|
|
preempt_disable();
|
|
__set_bit(RSEQ_EVENT_SIGNAL_BIT, ¤t->rseq_event_mask);
|
|
preempt_enable();
|
|
rseq_handle_notify_resume(ksig, regs);
|
|
}
|
|
|
|
/* rseq_preempt() requires preemption to be disabled. */
|
|
static inline void rseq_preempt(struct task_struct *t)
|
|
{
|
|
__set_bit(RSEQ_EVENT_PREEMPT_BIT, &t->rseq_event_mask);
|
|
rseq_set_notify_resume(t);
|
|
}
|
|
|
|
/* rseq_migrate() requires preemption to be disabled. */
|
|
static inline void rseq_migrate(struct task_struct *t)
|
|
{
|
|
__set_bit(RSEQ_EVENT_MIGRATE_BIT, &t->rseq_event_mask);
|
|
rseq_set_notify_resume(t);
|
|
}
|
|
|
|
/*
|
|
* If parent process has a registered restartable sequences area, the
|
|
* child inherits. Unregister rseq for a clone with CLONE_VM set.
|
|
*/
|
|
static inline void rseq_fork(struct task_struct *t, unsigned long clone_flags)
|
|
{
|
|
if (clone_flags & CLONE_VM) {
|
|
t->rseq = NULL;
|
|
t->rseq_len = 0;
|
|
t->rseq_sig = 0;
|
|
t->rseq_event_mask = 0;
|
|
} else {
|
|
t->rseq = current->rseq;
|
|
t->rseq_len = current->rseq_len;
|
|
t->rseq_sig = current->rseq_sig;
|
|
t->rseq_event_mask = current->rseq_event_mask;
|
|
}
|
|
}
|
|
|
|
static inline void rseq_execve(struct task_struct *t)
|
|
{
|
|
t->rseq = NULL;
|
|
t->rseq_len = 0;
|
|
t->rseq_sig = 0;
|
|
t->rseq_event_mask = 0;
|
|
}
|
|
|
|
#else
|
|
|
|
static inline void rseq_set_notify_resume(struct task_struct *t)
|
|
{
|
|
}
|
|
static inline void rseq_handle_notify_resume(struct ksignal *ksig,
|
|
struct pt_regs *regs)
|
|
{
|
|
}
|
|
static inline void rseq_signal_deliver(struct ksignal *ksig,
|
|
struct pt_regs *regs)
|
|
{
|
|
}
|
|
static inline void rseq_preempt(struct task_struct *t)
|
|
{
|
|
}
|
|
static inline void rseq_migrate(struct task_struct *t)
|
|
{
|
|
}
|
|
static inline void rseq_fork(struct task_struct *t, unsigned long clone_flags)
|
|
{
|
|
}
|
|
static inline void rseq_execve(struct task_struct *t)
|
|
{
|
|
}
|
|
|
|
#endif
|
|
|
|
#ifdef CONFIG_DEBUG_RSEQ
|
|
|
|
void rseq_syscall(struct pt_regs *regs);
|
|
|
|
#else
|
|
|
|
static inline void rseq_syscall(struct pt_regs *regs)
|
|
{
|
|
}
|
|
|
|
#endif
|
|
|
|
#ifdef CONFIG_SCHED_CORE
|
|
extern void sched_core_free(struct task_struct *tsk);
|
|
extern void sched_core_fork(struct task_struct *p);
|
|
extern int sched_core_share_pid(unsigned int cmd, pid_t pid, enum pid_type type,
|
|
unsigned long uaddr);
|
|
#else
|
|
static inline void sched_core_free(struct task_struct *tsk) { }
|
|
static inline void sched_core_fork(struct task_struct *p) { }
|
|
#endif
|
|
|
|
extern void sched_set_stop_task(int cpu, struct task_struct *stop);
|
|
|
|
#endif
|