116 lines
2.9 KiB
C
116 lines
2.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __INCLUDE_LINUX_OOM_H
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#define __INCLUDE_LINUX_OOM_H
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#include <linux/sched/signal.h>
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#include <linux/types.h>
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#include <linux/nodemask.h>
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#include <uapi/linux/oom.h>
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#include <linux/sched/coredump.h> /* MMF_* */
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#include <linux/mm.h> /* VM_FAULT* */
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struct zonelist;
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struct notifier_block;
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struct mem_cgroup;
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struct task_struct;
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enum oom_constraint {
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CONSTRAINT_NONE,
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CONSTRAINT_CPUSET,
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CONSTRAINT_MEMORY_POLICY,
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CONSTRAINT_MEMCG,
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};
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/*
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* Details of the page allocation that triggered the oom killer that are used to
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* determine what should be killed.
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*/
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struct oom_control {
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/* Used to determine cpuset */
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struct zonelist *zonelist;
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/* Used to determine mempolicy */
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nodemask_t *nodemask;
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/* Memory cgroup in which oom is invoked, or NULL for global oom */
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struct mem_cgroup *memcg;
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/* Used to determine cpuset and node locality requirement */
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const gfp_t gfp_mask;
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/*
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* order == -1 means the oom kill is required by sysrq, otherwise only
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* for display purposes.
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*/
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const int order;
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/* Used by oom implementation, do not set */
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unsigned long totalpages;
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struct task_struct *chosen;
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long chosen_points;
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/* Used to print the constraint info. */
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enum oom_constraint constraint;
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};
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extern struct mutex oom_lock;
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extern struct mutex oom_adj_mutex;
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static inline void set_current_oom_origin(void)
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{
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current->signal->oom_flag_origin = true;
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}
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static inline void clear_current_oom_origin(void)
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{
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current->signal->oom_flag_origin = false;
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}
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static inline bool oom_task_origin(const struct task_struct *p)
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{
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return p->signal->oom_flag_origin;
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}
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static inline bool tsk_is_oom_victim(struct task_struct * tsk)
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{
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return tsk->signal->oom_mm;
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}
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/*
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* Checks whether a page fault on the given mm is still reliable.
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* This is no longer true if the oom reaper started to reap the
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* address space which is reflected by MMF_UNSTABLE flag set in
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* the mm. At that moment any !shared mapping would lose the content
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* and could cause a memory corruption (zero pages instead of the
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* original content).
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*
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* User should call this before establishing a page table entry for
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* a !shared mapping and under the proper page table lock.
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*
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* Return 0 when the PF is safe VM_FAULT_SIGBUS otherwise.
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*/
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static inline vm_fault_t check_stable_address_space(struct mm_struct *mm)
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{
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if (unlikely(test_bit(MMF_UNSTABLE, &mm->flags)))
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return VM_FAULT_SIGBUS;
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return 0;
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}
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long oom_badness(struct task_struct *p,
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unsigned long totalpages);
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extern bool out_of_memory(struct oom_control *oc);
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extern void exit_oom_victim(void);
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extern int register_oom_notifier(struct notifier_block *nb);
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extern int unregister_oom_notifier(struct notifier_block *nb);
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extern bool oom_killer_disable(signed long timeout);
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extern void oom_killer_enable(void);
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extern struct task_struct *find_lock_task_mm(struct task_struct *p);
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#endif /* _INCLUDE_LINUX_OOM_H */
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