377 lines
11 KiB
C
377 lines
11 KiB
C
// 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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#define _GNU_SOURCE /* for program_invocation_name */
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.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 <linux/bitops.h>
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#include "kvm_util.h"
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#include "perf_test_util.h"
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#include "processor.h"
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#include "test_util.h"
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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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/* Host variables */
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static bool host_quit;
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static uint64_t iteration;
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static uint64_t vcpu_last_completed_iteration[MAX_VCPUS];
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static void *vcpu_worker(void *data)
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{
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int ret;
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struct kvm_vm *vm = perf_test_args.vm;
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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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struct vcpu_args *vcpu_args = (struct vcpu_args *)data;
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int vcpu_id = vcpu_args->vcpu_id;
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vcpu_args_set(vm, vcpu_id, 1, vcpu_id);
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run = vcpu_state(vm, vcpu_id);
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while (!READ_ONCE(host_quit)) {
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uint64_t current_iteration = READ_ONCE(iteration);
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clock_gettime(CLOCK_MONOTONIC, &start);
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ret = _vcpu_run(vm, vcpu_id);
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ts_diff = timespec_diff_now(start);
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TEST_ASSERT(ret == 0, "vcpu_run failed: %d\n", ret);
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TEST_ASSERT(get_ucall(vm, vcpu_id, 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_id);
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vcpu_last_completed_iteration[vcpu_id] = current_iteration;
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pr_debug("vCPU %d updated last completed iteration to %lu\n",
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vcpu_id, vcpu_last_completed_iteration[vcpu_id]);
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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 %lu dirty memory time: %ld.%.9lds\n",
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vcpu_id, 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 %lu populate memory time: %ld.%.9lds\n",
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vcpu_id, current_iteration, ts_diff.tv_sec,
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ts_diff.tv_nsec);
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}
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while (current_iteration == READ_ONCE(iteration) &&
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!READ_ONCE(host_quit)) {}
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}
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avg = timespec_div(total, vcpu_last_completed_iteration[vcpu_id]);
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pr_debug("\nvCPU %d dirtied 0x%lx pages over %lu iterations in %ld.%.9lds. (Avg %ld.%.9lds/iteration)\n",
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vcpu_id, pages_count, vcpu_last_completed_iteration[vcpu_id],
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total.tv_sec, total.tv_nsec, avg.tv_sec, avg.tv_nsec);
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return NULL;
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}
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#ifdef USE_CLEAR_DIRTY_LOG
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static u64 dirty_log_manual_caps;
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#endif
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static void run_test(enum vm_guest_mode mode, unsigned long iterations,
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uint64_t phys_offset, int wr_fract)
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{
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pthread_t *vcpu_threads;
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struct kvm_vm *vm;
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unsigned long *bmap;
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uint64_t guest_num_pages;
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uint64_t host_num_pages;
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int vcpu_id;
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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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#ifdef USE_CLEAR_DIRTY_LOG
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struct kvm_enable_cap cap = {};
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struct timespec clear_dirty_log_total = (struct timespec){0};
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#endif
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vm = create_vm(mode, nr_vcpus, guest_percpu_mem_size);
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perf_test_args.wr_fract = wr_fract;
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guest_num_pages = (nr_vcpus * guest_percpu_mem_size) >> vm_get_page_shift(vm);
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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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bmap = bitmap_alloc(host_num_pages);
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#ifdef USE_CLEAR_DIRTY_LOG
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cap.cap = KVM_CAP_MANUAL_DIRTY_LOG_PROTECT2;
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cap.args[0] = dirty_log_manual_caps;
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vm_enable_cap(vm, &cap);
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#endif
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vcpu_threads = malloc(nr_vcpus * sizeof(*vcpu_threads));
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TEST_ASSERT(vcpu_threads, "Memory allocation failed");
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add_vcpus(vm, nr_vcpus, guest_percpu_mem_size);
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sync_global_to_guest(vm, perf_test_args);
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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 (vcpu_id = 0; vcpu_id < nr_vcpus; vcpu_id++) {
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pthread_create(&vcpu_threads[vcpu_id], NULL, vcpu_worker,
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&perf_test_args.vcpu_args[vcpu_id]);
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}
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/* Allow the vCPU to populate memory */
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pr_debug("Starting iteration %lu - Populating\n", iteration);
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while (READ_ONCE(vcpu_last_completed_iteration[vcpu_id]) != iteration)
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pr_debug("Waiting for vcpu_last_completed_iteration == %lu\n",
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iteration);
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ts_diff = timespec_diff_now(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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vm_mem_region_set_flags(vm, TEST_MEM_SLOT_INDEX,
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KVM_MEM_LOG_DIRTY_PAGES);
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ts_diff = timespec_diff_now(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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while (iteration < 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 %lu\n", iteration);
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for (vcpu_id = 0; vcpu_id < nr_vcpus; vcpu_id++) {
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while (READ_ONCE(vcpu_last_completed_iteration[vcpu_id]) != iteration)
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pr_debug("Waiting for vCPU %d vcpu_last_completed_iteration == %lu\n",
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vcpu_id, iteration);
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}
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ts_diff = timespec_diff_now(start);
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vcpu_dirty_total = timespec_add(vcpu_dirty_total, ts_diff);
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pr_info("Iteration %lu 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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kvm_vm_get_dirty_log(vm, TEST_MEM_SLOT_INDEX, bmap);
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ts_diff = timespec_diff_now(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 %lu get dirty log time: %ld.%.9lds\n",
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iteration, ts_diff.tv_sec, ts_diff.tv_nsec);
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#ifdef USE_CLEAR_DIRTY_LOG
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clock_gettime(CLOCK_MONOTONIC, &start);
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kvm_vm_clear_dirty_log(vm, TEST_MEM_SLOT_INDEX, bmap, 0,
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host_num_pages);
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ts_diff = timespec_diff_now(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 %lu clear dirty log time: %ld.%.9lds\n",
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iteration, ts_diff.tv_sec, ts_diff.tv_nsec);
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#endif
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}
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/* Tell the vcpu thread to quit */
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host_quit = true;
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for (vcpu_id = 0; vcpu_id < nr_vcpus; vcpu_id++)
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pthread_join(vcpu_threads[vcpu_id], NULL);
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/* Disable dirty logging */
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clock_gettime(CLOCK_MONOTONIC, &start);
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vm_mem_region_set_flags(vm, TEST_MEM_SLOT_INDEX, 0);
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ts_diff = timespec_diff_now(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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avg = timespec_div(get_dirty_log_total, 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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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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#ifdef USE_CLEAR_DIRTY_LOG
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avg = timespec_div(clear_dirty_log_total, iterations);
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pr_info("Clear dirty log over %lu iterations took %ld.%.9lds. (Avg %ld.%.9lds/iteration)\n",
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iterations, clear_dirty_log_total.tv_sec,
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clear_dirty_log_total.tv_nsec, avg.tv_sec, avg.tv_nsec);
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#endif
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free(bmap);
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free(vcpu_threads);
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ucall_uninit(vm);
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kvm_vm_free(vm);
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}
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struct guest_mode {
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bool supported;
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bool enabled;
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};
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static struct guest_mode guest_modes[NUM_VM_MODES];
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#define guest_mode_init(mode, supported, enabled) ({ \
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guest_modes[mode] = (struct guest_mode){ supported, enabled }; \
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})
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static void help(char *name)
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{
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int i;
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puts("");
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printf("usage: %s [-h] [-i iterations] [-p offset] "
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"[-m mode] [-b vcpu bytes] [-v vcpus]\n", name);
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puts("");
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printf(" -i: specify iteration counts (default: %"PRIu64")\n",
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TEST_HOST_LOOP_N);
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printf(" -p: specify guest physical test memory offset\n"
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" Warning: a low offset can conflict with the loaded test code.\n");
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printf(" -m: specify the guest mode ID to test "
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"(default: test all supported modes)\n"
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" This option may be used multiple times.\n"
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" Guest mode IDs:\n");
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for (i = 0; i < NUM_VM_MODES; ++i) {
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printf(" %d: %s%s\n", i, vm_guest_mode_string(i),
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guest_modes[i].supported ? " (supported)" : "");
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}
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printf(" -b: specify the size of the memory region which should be\n"
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" dirtied by each vCPU. e.g. 10M or 3G.\n"
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" (default: 1G)\n");
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printf(" -f: specify the fraction of pages which should be written to\n"
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" as opposed to simply read, in the form\n"
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" 1/<fraction of pages to write>.\n"
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" (default: 1 i.e. all pages are written to.)\n");
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printf(" -v: specify the number of vCPUs to run.\n");
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puts("");
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exit(0);
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}
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int main(int argc, char *argv[])
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{
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unsigned long iterations = TEST_HOST_LOOP_N;
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bool mode_selected = false;
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uint64_t phys_offset = 0;
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unsigned int mode;
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int opt, i;
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int wr_fract = 1;
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#ifdef USE_CLEAR_DIRTY_LOG
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dirty_log_manual_caps =
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kvm_check_cap(KVM_CAP_MANUAL_DIRTY_LOG_PROTECT2);
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if (!dirty_log_manual_caps) {
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print_skip("KVM_CLEAR_DIRTY_LOG not available");
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exit(KSFT_SKIP);
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}
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dirty_log_manual_caps &= (KVM_DIRTY_LOG_MANUAL_PROTECT_ENABLE |
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KVM_DIRTY_LOG_INITIALLY_SET);
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#endif
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#ifdef __x86_64__
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guest_mode_init(VM_MODE_PXXV48_4K, true, true);
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#endif
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#ifdef __aarch64__
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guest_mode_init(VM_MODE_P40V48_4K, true, true);
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guest_mode_init(VM_MODE_P40V48_64K, true, true);
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{
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unsigned int limit = kvm_check_cap(KVM_CAP_ARM_VM_IPA_SIZE);
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if (limit >= 52)
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guest_mode_init(VM_MODE_P52V48_64K, true, true);
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if (limit >= 48) {
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guest_mode_init(VM_MODE_P48V48_4K, true, true);
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guest_mode_init(VM_MODE_P48V48_64K, true, true);
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}
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}
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#endif
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#ifdef __s390x__
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guest_mode_init(VM_MODE_P40V48_4K, true, true);
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#endif
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while ((opt = getopt(argc, argv, "hi:p:m:b:f:v:")) != -1) {
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switch (opt) {
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case 'i':
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iterations = strtol(optarg, NULL, 10);
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break;
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case 'p':
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phys_offset = strtoull(optarg, NULL, 0);
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break;
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case 'm':
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if (!mode_selected) {
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for (i = 0; i < NUM_VM_MODES; ++i)
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guest_modes[i].enabled = false;
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mode_selected = true;
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}
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mode = strtoul(optarg, NULL, 10);
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TEST_ASSERT(mode < NUM_VM_MODES,
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"Guest mode ID %d too big", mode);
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guest_modes[mode].enabled = true;
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break;
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case 'b':
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guest_percpu_mem_size = parse_size(optarg);
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break;
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case 'f':
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wr_fract = atoi(optarg);
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TEST_ASSERT(wr_fract >= 1,
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"Write fraction cannot be less than one");
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break;
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case 'v':
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nr_vcpus = atoi(optarg);
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TEST_ASSERT(nr_vcpus > 0,
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"Must have a positive number of vCPUs");
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TEST_ASSERT(nr_vcpus <= MAX_VCPUS,
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"This test does not currently support\n"
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"more than %d vCPUs.", MAX_VCPUS);
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break;
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case 'h':
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default:
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help(argv[0]);
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break;
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}
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}
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TEST_ASSERT(iterations >= 2, "The test should have at least two iterations");
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pr_info("Test iterations: %"PRIu64"\n", iterations);
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for (i = 0; i < NUM_VM_MODES; ++i) {
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if (!guest_modes[i].enabled)
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continue;
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TEST_ASSERT(guest_modes[i].supported,
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"Guest mode ID %d (%s) not supported.",
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i, vm_guest_mode_string(i));
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run_test(i, iterations, phys_offset, wr_fract);
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}
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return 0;
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}
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