516 lines
15 KiB
C
516 lines
15 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* KVM dirty page logging performance test
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*
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* Based on dirty_log_test.c
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*
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* Copyright (C) 2018, Red Hat, Inc.
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* Copyright (C) 2020, Google, Inc.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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#include <pthread.h>
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#include <linux/bitmap.h>
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#include "kvm_util.h"
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#include "test_util.h"
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#include "memstress.h"
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#include "guest_modes.h"
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#ifdef __aarch64__
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#include "aarch64/vgic.h"
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#define GICD_BASE_GPA 0x8000000ULL
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#define GICR_BASE_GPA 0x80A0000ULL
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static int gic_fd;
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static void arch_setup_vm(struct kvm_vm *vm, unsigned int nr_vcpus)
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{
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/*
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* The test can still run even if hardware does not support GICv3, as it
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* is only an optimization to reduce guest exits.
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*/
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gic_fd = vgic_v3_setup(vm, nr_vcpus, 64, GICD_BASE_GPA, GICR_BASE_GPA);
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}
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static void arch_cleanup_vm(struct kvm_vm *vm)
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{
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if (gic_fd > 0)
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close(gic_fd);
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}
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#else /* __aarch64__ */
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static void arch_setup_vm(struct kvm_vm *vm, unsigned int nr_vcpus)
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{
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}
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static void arch_cleanup_vm(struct kvm_vm *vm)
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{
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}
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#endif
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/* How many host loops to run by default (one KVM_GET_DIRTY_LOG for each loop)*/
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#define TEST_HOST_LOOP_N 2UL
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static int nr_vcpus = 1;
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static uint64_t guest_percpu_mem_size = DEFAULT_PER_VCPU_MEM_SIZE;
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static bool run_vcpus_while_disabling_dirty_logging;
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/* Host variables */
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static u64 dirty_log_manual_caps;
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static bool host_quit;
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static int iteration;
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static int vcpu_last_completed_iteration[KVM_MAX_VCPUS];
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static void vcpu_worker(struct memstress_vcpu_args *vcpu_args)
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{
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struct kvm_vcpu *vcpu = vcpu_args->vcpu;
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int vcpu_idx = vcpu_args->vcpu_idx;
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uint64_t pages_count = 0;
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struct kvm_run *run;
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struct timespec start;
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struct timespec ts_diff;
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struct timespec total = (struct timespec){0};
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struct timespec avg;
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int ret;
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run = vcpu->run;
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while (!READ_ONCE(host_quit)) {
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int current_iteration = READ_ONCE(iteration);
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clock_gettime(CLOCK_MONOTONIC, &start);
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ret = _vcpu_run(vcpu);
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ts_diff = timespec_elapsed(start);
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TEST_ASSERT(ret == 0, "vcpu_run failed: %d\n", ret);
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TEST_ASSERT(get_ucall(vcpu, NULL) == UCALL_SYNC,
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"Invalid guest sync status: exit_reason=%s\n",
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exit_reason_str(run->exit_reason));
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pr_debug("Got sync event from vCPU %d\n", vcpu_idx);
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vcpu_last_completed_iteration[vcpu_idx] = current_iteration;
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pr_debug("vCPU %d updated last completed iteration to %d\n",
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vcpu_idx, vcpu_last_completed_iteration[vcpu_idx]);
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if (current_iteration) {
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pages_count += vcpu_args->pages;
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total = timespec_add(total, ts_diff);
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pr_debug("vCPU %d iteration %d dirty memory time: %ld.%.9lds\n",
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vcpu_idx, current_iteration, ts_diff.tv_sec,
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ts_diff.tv_nsec);
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} else {
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pr_debug("vCPU %d iteration %d populate memory time: %ld.%.9lds\n",
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vcpu_idx, current_iteration, ts_diff.tv_sec,
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ts_diff.tv_nsec);
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}
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/*
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* Keep running the guest while dirty logging is being disabled
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* (iteration is negative) so that vCPUs are accessing memory
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* for the entire duration of zapping collapsible SPTEs.
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*/
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while (current_iteration == READ_ONCE(iteration) &&
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READ_ONCE(iteration) >= 0 && !READ_ONCE(host_quit)) {}
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}
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avg = timespec_div(total, vcpu_last_completed_iteration[vcpu_idx]);
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pr_debug("\nvCPU %d dirtied 0x%lx pages over %d iterations in %ld.%.9lds. (Avg %ld.%.9lds/iteration)\n",
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vcpu_idx, pages_count, vcpu_last_completed_iteration[vcpu_idx],
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total.tv_sec, total.tv_nsec, avg.tv_sec, avg.tv_nsec);
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}
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struct test_params {
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unsigned long iterations;
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uint64_t phys_offset;
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bool partition_vcpu_memory_access;
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enum vm_mem_backing_src_type backing_src;
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int slots;
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uint32_t write_percent;
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uint32_t random_seed;
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bool random_access;
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};
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static void toggle_dirty_logging(struct kvm_vm *vm, int slots, bool enable)
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{
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int i;
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for (i = 0; i < slots; i++) {
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int slot = MEMSTRESS_MEM_SLOT_INDEX + i;
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int flags = enable ? KVM_MEM_LOG_DIRTY_PAGES : 0;
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vm_mem_region_set_flags(vm, slot, flags);
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}
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}
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static inline void enable_dirty_logging(struct kvm_vm *vm, int slots)
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{
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toggle_dirty_logging(vm, slots, true);
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}
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static inline void disable_dirty_logging(struct kvm_vm *vm, int slots)
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{
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toggle_dirty_logging(vm, slots, false);
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}
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static void get_dirty_log(struct kvm_vm *vm, unsigned long *bitmaps[], int slots)
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{
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int i;
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for (i = 0; i < slots; i++) {
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int slot = MEMSTRESS_MEM_SLOT_INDEX + i;
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kvm_vm_get_dirty_log(vm, slot, bitmaps[i]);
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}
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}
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static void clear_dirty_log(struct kvm_vm *vm, unsigned long *bitmaps[],
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int slots, uint64_t pages_per_slot)
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{
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int i;
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for (i = 0; i < slots; i++) {
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int slot = MEMSTRESS_MEM_SLOT_INDEX + i;
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kvm_vm_clear_dirty_log(vm, slot, bitmaps[i], 0, pages_per_slot);
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}
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}
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static unsigned long **alloc_bitmaps(int slots, uint64_t pages_per_slot)
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{
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unsigned long **bitmaps;
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int i;
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bitmaps = malloc(slots * sizeof(bitmaps[0]));
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TEST_ASSERT(bitmaps, "Failed to allocate bitmaps array.");
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for (i = 0; i < slots; i++) {
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bitmaps[i] = bitmap_zalloc(pages_per_slot);
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TEST_ASSERT(bitmaps[i], "Failed to allocate slot bitmap.");
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}
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return bitmaps;
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}
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static void free_bitmaps(unsigned long *bitmaps[], int slots)
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{
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int i;
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for (i = 0; i < slots; i++)
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free(bitmaps[i]);
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free(bitmaps);
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}
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static void run_test(enum vm_guest_mode mode, void *arg)
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{
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struct test_params *p = arg;
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struct kvm_vm *vm;
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unsigned long **bitmaps;
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uint64_t guest_num_pages;
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uint64_t host_num_pages;
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uint64_t pages_per_slot;
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struct timespec start;
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struct timespec ts_diff;
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struct timespec get_dirty_log_total = (struct timespec){0};
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struct timespec vcpu_dirty_total = (struct timespec){0};
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struct timespec avg;
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struct timespec clear_dirty_log_total = (struct timespec){0};
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int i;
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vm = memstress_create_vm(mode, nr_vcpus, guest_percpu_mem_size,
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p->slots, p->backing_src,
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p->partition_vcpu_memory_access);
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pr_info("Random seed: %u\n", p->random_seed);
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memstress_set_random_seed(vm, p->random_seed);
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memstress_set_write_percent(vm, p->write_percent);
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guest_num_pages = (nr_vcpus * guest_percpu_mem_size) >> vm->page_shift;
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guest_num_pages = vm_adjust_num_guest_pages(mode, guest_num_pages);
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host_num_pages = vm_num_host_pages(mode, guest_num_pages);
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pages_per_slot = host_num_pages / p->slots;
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bitmaps = alloc_bitmaps(p->slots, pages_per_slot);
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if (dirty_log_manual_caps)
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vm_enable_cap(vm, KVM_CAP_MANUAL_DIRTY_LOG_PROTECT2,
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dirty_log_manual_caps);
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arch_setup_vm(vm, nr_vcpus);
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/* Start the iterations */
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iteration = 0;
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host_quit = false;
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clock_gettime(CLOCK_MONOTONIC, &start);
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for (i = 0; i < nr_vcpus; i++)
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vcpu_last_completed_iteration[i] = -1;
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/*
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* Use 100% writes during the population phase to ensure all
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* memory is actually populated and not just mapped to the zero
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* page. The prevents expensive copy-on-write faults from
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* occurring during the dirty memory iterations below, which
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* would pollute the performance results.
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*/
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memstress_set_write_percent(vm, 100);
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memstress_set_random_access(vm, false);
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memstress_start_vcpu_threads(nr_vcpus, vcpu_worker);
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/* Allow the vCPUs to populate memory */
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pr_debug("Starting iteration %d - Populating\n", iteration);
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for (i = 0; i < nr_vcpus; i++) {
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while (READ_ONCE(vcpu_last_completed_iteration[i]) !=
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iteration)
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;
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}
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ts_diff = timespec_elapsed(start);
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pr_info("Populate memory time: %ld.%.9lds\n",
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ts_diff.tv_sec, ts_diff.tv_nsec);
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/* Enable dirty logging */
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clock_gettime(CLOCK_MONOTONIC, &start);
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enable_dirty_logging(vm, p->slots);
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ts_diff = timespec_elapsed(start);
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pr_info("Enabling dirty logging time: %ld.%.9lds\n\n",
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ts_diff.tv_sec, ts_diff.tv_nsec);
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memstress_set_write_percent(vm, p->write_percent);
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memstress_set_random_access(vm, p->random_access);
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while (iteration < p->iterations) {
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/*
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* Incrementing the iteration number will start the vCPUs
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* dirtying memory again.
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*/
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clock_gettime(CLOCK_MONOTONIC, &start);
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iteration++;
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pr_debug("Starting iteration %d\n", iteration);
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for (i = 0; i < nr_vcpus; i++) {
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while (READ_ONCE(vcpu_last_completed_iteration[i])
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!= iteration)
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;
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}
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ts_diff = timespec_elapsed(start);
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vcpu_dirty_total = timespec_add(vcpu_dirty_total, ts_diff);
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pr_info("Iteration %d dirty memory time: %ld.%.9lds\n",
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iteration, ts_diff.tv_sec, ts_diff.tv_nsec);
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clock_gettime(CLOCK_MONOTONIC, &start);
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get_dirty_log(vm, bitmaps, p->slots);
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ts_diff = timespec_elapsed(start);
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get_dirty_log_total = timespec_add(get_dirty_log_total,
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ts_diff);
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pr_info("Iteration %d get dirty log time: %ld.%.9lds\n",
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iteration, ts_diff.tv_sec, ts_diff.tv_nsec);
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if (dirty_log_manual_caps) {
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clock_gettime(CLOCK_MONOTONIC, &start);
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clear_dirty_log(vm, bitmaps, p->slots, pages_per_slot);
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ts_diff = timespec_elapsed(start);
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clear_dirty_log_total = timespec_add(clear_dirty_log_total,
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ts_diff);
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pr_info("Iteration %d clear dirty log time: %ld.%.9lds\n",
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iteration, ts_diff.tv_sec, ts_diff.tv_nsec);
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}
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}
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/*
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* Run vCPUs while dirty logging is being disabled to stress disabling
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* in terms of both performance and correctness. Opt-in via command
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* line as this significantly increases time to disable dirty logging.
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*/
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if (run_vcpus_while_disabling_dirty_logging)
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WRITE_ONCE(iteration, -1);
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/* Disable dirty logging */
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clock_gettime(CLOCK_MONOTONIC, &start);
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disable_dirty_logging(vm, p->slots);
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ts_diff = timespec_elapsed(start);
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pr_info("Disabling dirty logging time: %ld.%.9lds\n",
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ts_diff.tv_sec, ts_diff.tv_nsec);
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/*
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* Tell the vCPU threads to quit. No need to manually check that vCPUs
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* have stopped running after disabling dirty logging, the join will
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* wait for them to exit.
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*/
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host_quit = true;
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memstress_join_vcpu_threads(nr_vcpus);
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avg = timespec_div(get_dirty_log_total, p->iterations);
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pr_info("Get dirty log over %lu iterations took %ld.%.9lds. (Avg %ld.%.9lds/iteration)\n",
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p->iterations, get_dirty_log_total.tv_sec,
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get_dirty_log_total.tv_nsec, avg.tv_sec, avg.tv_nsec);
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if (dirty_log_manual_caps) {
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avg = timespec_div(clear_dirty_log_total, p->iterations);
|
||
|
|
pr_info("Clear dirty log over %lu iterations took %ld.%.9lds. (Avg %ld.%.9lds/iteration)\n",
|
||
|
|
p->iterations, clear_dirty_log_total.tv_sec,
|
||
|
|
clear_dirty_log_total.tv_nsec, avg.tv_sec, avg.tv_nsec);
|
||
|
|
}
|
||
|
|
|
||
|
|
free_bitmaps(bitmaps, p->slots);
|
||
|
|
arch_cleanup_vm(vm);
|
||
|
|
memstress_destroy_vm(vm);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void help(char *name)
|
||
|
|
{
|
||
|
|
puts("");
|
||
|
|
printf("usage: %s [-h] [-a] [-i iterations] [-p offset] [-g] "
|
||
|
|
"[-m mode] [-n] [-b vcpu bytes] [-v vcpus] [-o] [-r random seed ] [-s mem type]"
|
||
|
|
"[-x memslots] [-w percentage] [-c physical cpus to run test on]\n", name);
|
||
|
|
puts("");
|
||
|
|
printf(" -a: access memory randomly rather than in order.\n");
|
||
|
|
printf(" -i: specify iteration counts (default: %"PRIu64")\n",
|
||
|
|
TEST_HOST_LOOP_N);
|
||
|
|
printf(" -g: Do not enable KVM_CAP_MANUAL_DIRTY_LOG_PROTECT2. This\n"
|
||
|
|
" makes KVM_GET_DIRTY_LOG clear the dirty log (i.e.\n"
|
||
|
|
" KVM_DIRTY_LOG_MANUAL_PROTECT_ENABLE is not enabled)\n"
|
||
|
|
" and writes will be tracked as soon as dirty logging is\n"
|
||
|
|
" enabled on the memslot (i.e. KVM_DIRTY_LOG_INITIALLY_SET\n"
|
||
|
|
" is not enabled).\n");
|
||
|
|
printf(" -p: specify guest physical test memory offset\n"
|
||
|
|
" Warning: a low offset can conflict with the loaded test code.\n");
|
||
|
|
guest_modes_help();
|
||
|
|
printf(" -n: Run the vCPUs in nested mode (L2)\n");
|
||
|
|
printf(" -e: Run vCPUs while dirty logging is being disabled. This\n"
|
||
|
|
" can significantly increase runtime, especially if there\n"
|
||
|
|
" isn't a dedicated pCPU for the main thread.\n");
|
||
|
|
printf(" -b: specify the size of the memory region which should be\n"
|
||
|
|
" dirtied by each vCPU. e.g. 10M or 3G.\n"
|
||
|
|
" (default: 1G)\n");
|
||
|
|
printf(" -v: specify the number of vCPUs to run.\n");
|
||
|
|
printf(" -o: Overlap guest memory accesses instead of partitioning\n"
|
||
|
|
" them into a separate region of memory for each vCPU.\n");
|
||
|
|
printf(" -r: specify the starting random seed.\n");
|
||
|
|
backing_src_help("-s");
|
||
|
|
printf(" -x: Split the memory region into this number of memslots.\n"
|
||
|
|
" (default: 1)\n");
|
||
|
|
printf(" -w: specify the percentage of pages which should be written to\n"
|
||
|
|
" as an integer from 0-100 inclusive. This is probabilistic,\n"
|
||
|
|
" so -w X means each page has an X%% chance of writing\n"
|
||
|
|
" and a (100-X)%% chance of reading.\n"
|
||
|
|
" (default: 100 i.e. all pages are written to.)\n");
|
||
|
|
printf(" -c: Pin tasks to physical CPUs. Takes a list of comma separated\n"
|
||
|
|
" values (target pCPU), one for each vCPU, plus an optional\n"
|
||
|
|
" entry for the main application task (specified via entry\n"
|
||
|
|
" <nr_vcpus + 1>). If used, entries must be provided for all\n"
|
||
|
|
" vCPUs, i.e. pinning vCPUs is all or nothing.\n\n"
|
||
|
|
" E.g. to create 3 vCPUs, pin vCPU0=>pCPU22, vCPU1=>pCPU23,\n"
|
||
|
|
" vCPU2=>pCPU24, and pin the application task to pCPU50:\n\n"
|
||
|
|
" ./dirty_log_perf_test -v 3 -c 22,23,24,50\n\n"
|
||
|
|
" To leave the application task unpinned, drop the final entry:\n\n"
|
||
|
|
" ./dirty_log_perf_test -v 3 -c 22,23,24\n\n"
|
||
|
|
" (default: no pinning)\n");
|
||
|
|
puts("");
|
||
|
|
exit(0);
|
||
|
|
}
|
||
|
|
|
||
|
|
int main(int argc, char *argv[])
|
||
|
|
{
|
||
|
|
int max_vcpus = kvm_check_cap(KVM_CAP_MAX_VCPUS);
|
||
|
|
const char *pcpu_list = NULL;
|
||
|
|
struct test_params p = {
|
||
|
|
.iterations = TEST_HOST_LOOP_N,
|
||
|
|
.partition_vcpu_memory_access = true,
|
||
|
|
.backing_src = DEFAULT_VM_MEM_SRC,
|
||
|
|
.slots = 1,
|
||
|
|
.random_seed = 1,
|
||
|
|
.write_percent = 100,
|
||
|
|
};
|
||
|
|
int opt;
|
||
|
|
|
||
|
|
dirty_log_manual_caps =
|
||
|
|
kvm_check_cap(KVM_CAP_MANUAL_DIRTY_LOG_PROTECT2);
|
||
|
|
dirty_log_manual_caps &= (KVM_DIRTY_LOG_MANUAL_PROTECT_ENABLE |
|
||
|
|
KVM_DIRTY_LOG_INITIALLY_SET);
|
||
|
|
|
||
|
|
guest_modes_append_default();
|
||
|
|
|
||
|
|
while ((opt = getopt(argc, argv, "ab:c:eghi:m:nop:r:s:v:x:w:")) != -1) {
|
||
|
|
switch (opt) {
|
||
|
|
case 'a':
|
||
|
|
p.random_access = true;
|
||
|
|
break;
|
||
|
|
case 'b':
|
||
|
|
guest_percpu_mem_size = parse_size(optarg);
|
||
|
|
break;
|
||
|
|
case 'c':
|
||
|
|
pcpu_list = optarg;
|
||
|
|
break;
|
||
|
|
case 'e':
|
||
|
|
/* 'e' is for evil. */
|
||
|
|
run_vcpus_while_disabling_dirty_logging = true;
|
||
|
|
break;
|
||
|
|
case 'g':
|
||
|
|
dirty_log_manual_caps = 0;
|
||
|
|
break;
|
||
|
|
case 'h':
|
||
|
|
help(argv[0]);
|
||
|
|
break;
|
||
|
|
case 'i':
|
||
|
|
p.iterations = atoi_positive("Number of iterations", optarg);
|
||
|
|
break;
|
||
|
|
case 'm':
|
||
|
|
guest_modes_cmdline(optarg);
|
||
|
|
break;
|
||
|
|
case 'n':
|
||
|
|
memstress_args.nested = true;
|
||
|
|
break;
|
||
|
|
case 'o':
|
||
|
|
p.partition_vcpu_memory_access = false;
|
||
|
|
break;
|
||
|
|
case 'p':
|
||
|
|
p.phys_offset = strtoull(optarg, NULL, 0);
|
||
|
|
break;
|
||
|
|
case 'r':
|
||
|
|
p.random_seed = atoi_positive("Random seed", optarg);
|
||
|
|
break;
|
||
|
|
case 's':
|
||
|
|
p.backing_src = parse_backing_src_type(optarg);
|
||
|
|
break;
|
||
|
|
case 'v':
|
||
|
|
nr_vcpus = atoi_positive("Number of vCPUs", optarg);
|
||
|
|
TEST_ASSERT(nr_vcpus <= max_vcpus,
|
||
|
|
"Invalid number of vcpus, must be between 1 and %d", max_vcpus);
|
||
|
|
break;
|
||
|
|
case 'w':
|
||
|
|
p.write_percent = atoi_non_negative("Write percentage", optarg);
|
||
|
|
TEST_ASSERT(p.write_percent <= 100,
|
||
|
|
"Write percentage must be between 0 and 100");
|
||
|
|
break;
|
||
|
|
case 'x':
|
||
|
|
p.slots = atoi_positive("Number of slots", optarg);
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
help(argv[0]);
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (pcpu_list) {
|
||
|
|
kvm_parse_vcpu_pinning(pcpu_list, memstress_args.vcpu_to_pcpu,
|
||
|
|
nr_vcpus);
|
||
|
|
memstress_args.pin_vcpus = true;
|
||
|
|
}
|
||
|
|
|
||
|
|
TEST_ASSERT(p.iterations >= 2, "The test should have at least two iterations");
|
||
|
|
|
||
|
|
pr_info("Test iterations: %"PRIu64"\n", p.iterations);
|
||
|
|
|
||
|
|
for_each_guest_mode(run_test, &p);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|