Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Ben Gardon | 1106 | 64.30% | 13 | 27.08% |
David Matlack | 125 | 7.27% | 8 | 16.67% |
Colton Lewis | 109 | 6.34% | 3 | 6.25% |
Sean Christopherson | 101 | 5.87% | 7 | 14.58% |
Andrew Jones | 89 | 5.17% | 5 | 10.42% |
Vipin Sharma | 73 | 4.24% | 4 | 8.33% |
Oliver Upton | 67 | 3.90% | 1 | 2.08% |
Paolo Bonzini | 23 | 1.34% | 3 | 6.25% |
Jing Zhang | 21 | 1.22% | 1 | 2.08% |
Michael Roth | 3 | 0.17% | 1 | 2.08% |
Peter Xu | 2 | 0.12% | 1 | 2.08% |
Colin Ian King | 1 | 0.06% | 1 | 2.08% |
Total | 1720 | 48 |
// SPDX-License-Identifier: GPL-2.0 /* * KVM dirty page logging performance test * * Based on dirty_log_test.c * * Copyright (C) 2018, Red Hat, Inc. * Copyright (C) 2020, Google, Inc. */ #include <stdio.h> #include <stdlib.h> #include <time.h> #include <pthread.h> #include <linux/bitmap.h> #include "kvm_util.h" #include "test_util.h" #include "memstress.h" #include "guest_modes.h" #include "ucall_common.h" #ifdef __aarch64__ #include "aarch64/vgic.h" static int gic_fd; static void arch_setup_vm(struct kvm_vm *vm, unsigned int nr_vcpus) { /* * The test can still run even if hardware does not support GICv3, as it * is only an optimization to reduce guest exits. */ gic_fd = vgic_v3_setup(vm, nr_vcpus, 64); } static void arch_cleanup_vm(struct kvm_vm *vm) { if (gic_fd > 0) close(gic_fd); } #else /* __aarch64__ */ static void arch_setup_vm(struct kvm_vm *vm, unsigned int nr_vcpus) { } static void arch_cleanup_vm(struct kvm_vm *vm) { } #endif /* How many host loops to run by default (one KVM_GET_DIRTY_LOG for each loop)*/ #define TEST_HOST_LOOP_N 2UL static int nr_vcpus = 1; static uint64_t guest_percpu_mem_size = DEFAULT_PER_VCPU_MEM_SIZE; static bool run_vcpus_while_disabling_dirty_logging; /* Host variables */ static u64 dirty_log_manual_caps; static bool host_quit; static int iteration; static int vcpu_last_completed_iteration[KVM_MAX_VCPUS]; static void vcpu_worker(struct memstress_vcpu_args *vcpu_args) { struct kvm_vcpu *vcpu = vcpu_args->vcpu; int vcpu_idx = vcpu_args->vcpu_idx; uint64_t pages_count = 0; struct kvm_run *run; struct timespec start; struct timespec ts_diff; struct timespec total = (struct timespec){0}; struct timespec avg; int ret; run = vcpu->run; while (!READ_ONCE(host_quit)) { int current_iteration = READ_ONCE(iteration); clock_gettime(CLOCK_MONOTONIC, &start); ret = _vcpu_run(vcpu); ts_diff = timespec_elapsed(start); TEST_ASSERT(ret == 0, "vcpu_run failed: %d", ret); TEST_ASSERT(get_ucall(vcpu, NULL) == UCALL_SYNC, "Invalid guest sync status: exit_reason=%s", exit_reason_str(run->exit_reason)); pr_debug("Got sync event from vCPU %d\n", vcpu_idx); vcpu_last_completed_iteration[vcpu_idx] = current_iteration; pr_debug("vCPU %d updated last completed iteration to %d\n", vcpu_idx, vcpu_last_completed_iteration[vcpu_idx]); if (current_iteration) { pages_count += vcpu_args->pages; total = timespec_add(total, ts_diff); pr_debug("vCPU %d iteration %d dirty memory time: %ld.%.9lds\n", vcpu_idx, current_iteration, ts_diff.tv_sec, ts_diff.tv_nsec); } else { pr_debug("vCPU %d iteration %d populate memory time: %ld.%.9lds\n", vcpu_idx, current_iteration, ts_diff.tv_sec, ts_diff.tv_nsec); } /* * Keep running the guest while dirty logging is being disabled * (iteration is negative) so that vCPUs are accessing memory * for the entire duration of zapping collapsible SPTEs. */ while (current_iteration == READ_ONCE(iteration) && READ_ONCE(iteration) >= 0 && !READ_ONCE(host_quit)) {} } avg = timespec_div(total, vcpu_last_completed_iteration[vcpu_idx]); pr_debug("\nvCPU %d dirtied 0x%lx pages over %d iterations in %ld.%.9lds. (Avg %ld.%.9lds/iteration)\n", vcpu_idx, pages_count, vcpu_last_completed_iteration[vcpu_idx], total.tv_sec, total.tv_nsec, avg.tv_sec, avg.tv_nsec); } struct test_params { unsigned long iterations; uint64_t phys_offset; bool partition_vcpu_memory_access; enum vm_mem_backing_src_type backing_src; int slots; uint32_t write_percent; bool random_access; }; static void run_test(enum vm_guest_mode mode, void *arg) { struct test_params *p = arg; struct kvm_vm *vm; unsigned long **bitmaps; uint64_t guest_num_pages; uint64_t host_num_pages; uint64_t pages_per_slot; struct timespec start; struct timespec ts_diff; struct timespec get_dirty_log_total = (struct timespec){0}; struct timespec vcpu_dirty_total = (struct timespec){0}; struct timespec avg; struct timespec clear_dirty_log_total = (struct timespec){0}; int i; vm = memstress_create_vm(mode, nr_vcpus, guest_percpu_mem_size, p->slots, p->backing_src, p->partition_vcpu_memory_access); memstress_set_write_percent(vm, p->write_percent); guest_num_pages = (nr_vcpus * guest_percpu_mem_size) >> vm->page_shift; guest_num_pages = vm_adjust_num_guest_pages(mode, guest_num_pages); host_num_pages = vm_num_host_pages(mode, guest_num_pages); pages_per_slot = host_num_pages / p->slots; bitmaps = memstress_alloc_bitmaps(p->slots, pages_per_slot); if (dirty_log_manual_caps) vm_enable_cap(vm, KVM_CAP_MANUAL_DIRTY_LOG_PROTECT2, dirty_log_manual_caps); arch_setup_vm(vm, nr_vcpus); /* Start the iterations */ iteration = 0; host_quit = false; clock_gettime(CLOCK_MONOTONIC, &start); for (i = 0; i < nr_vcpus; i++) vcpu_last_completed_iteration[i] = -1; /* * Use 100% writes during the population phase to ensure all * memory is actually populated and not just mapped to the zero * page. The prevents expensive copy-on-write faults from * occurring during the dirty memory iterations below, which * would pollute the performance results. */ memstress_set_write_percent(vm, 100); memstress_set_random_access(vm, false); memstress_start_vcpu_threads(nr_vcpus, vcpu_worker); /* Allow the vCPUs to populate memory */ pr_debug("Starting iteration %d - Populating\n", iteration); for (i = 0; i < nr_vcpus; i++) { while (READ_ONCE(vcpu_last_completed_iteration[i]) != iteration) ; } ts_diff = timespec_elapsed(start); pr_info("Populate memory time: %ld.%.9lds\n", ts_diff.tv_sec, ts_diff.tv_nsec); /* Enable dirty logging */ clock_gettime(CLOCK_MONOTONIC, &start); memstress_enable_dirty_logging(vm, p->slots); ts_diff = timespec_elapsed(start); pr_info("Enabling dirty logging time: %ld.%.9lds\n\n", ts_diff.tv_sec, ts_diff.tv_nsec); memstress_set_write_percent(vm, p->write_percent); memstress_set_random_access(vm, p->random_access); while (iteration < p->iterations) { /* * Incrementing the iteration number will start the vCPUs * dirtying memory again. */ clock_gettime(CLOCK_MONOTONIC, &start); iteration++; pr_debug("Starting iteration %d\n", iteration); for (i = 0; i < nr_vcpus; i++) { while (READ_ONCE(vcpu_last_completed_iteration[i]) != iteration) ; } ts_diff = timespec_elapsed(start); vcpu_dirty_total = timespec_add(vcpu_dirty_total, ts_diff); pr_info("Iteration %d dirty memory time: %ld.%.9lds\n", iteration, ts_diff.tv_sec, ts_diff.tv_nsec); clock_gettime(CLOCK_MONOTONIC, &start); memstress_get_dirty_log(vm, bitmaps, p->slots); ts_diff = timespec_elapsed(start); get_dirty_log_total = timespec_add(get_dirty_log_total, ts_diff); pr_info("Iteration %d get dirty log time: %ld.%.9lds\n", iteration, ts_diff.tv_sec, ts_diff.tv_nsec); if (dirty_log_manual_caps) { clock_gettime(CLOCK_MONOTONIC, &start); memstress_clear_dirty_log(vm, bitmaps, p->slots, pages_per_slot); ts_diff = timespec_elapsed(start); clear_dirty_log_total = timespec_add(clear_dirty_log_total, ts_diff); pr_info("Iteration %d clear dirty log time: %ld.%.9lds\n", iteration, ts_diff.tv_sec, ts_diff.tv_nsec); } } /* * Run vCPUs while dirty logging is being disabled to stress disabling * in terms of both performance and correctness. Opt-in via command * line as this significantly increases time to disable dirty logging. */ if (run_vcpus_while_disabling_dirty_logging) WRITE_ONCE(iteration, -1); /* Disable dirty logging */ clock_gettime(CLOCK_MONOTONIC, &start); memstress_disable_dirty_logging(vm, p->slots); ts_diff = timespec_elapsed(start); pr_info("Disabling dirty logging time: %ld.%.9lds\n", ts_diff.tv_sec, ts_diff.tv_nsec); /* * Tell the vCPU threads to quit. No need to manually check that vCPUs * have stopped running after disabling dirty logging, the join will * wait for them to exit. */ host_quit = true; memstress_join_vcpu_threads(nr_vcpus); avg = timespec_div(get_dirty_log_total, p->iterations); pr_info("Get dirty log over %lu iterations took %ld.%.9lds. (Avg %ld.%.9lds/iteration)\n", p->iterations, get_dirty_log_total.tv_sec, get_dirty_log_total.tv_nsec, avg.tv_sec, avg.tv_nsec); if (dirty_log_manual_caps) { 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); } memstress_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"); kvm_print_vcpu_pinning_help(); 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, .write_percent = 100, }; int opt; /* Override the seed to be deterministic by default. */ guest_random_seed = 1; 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': guest_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; }
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with Cregit http://github.com/cregit/cregit
Version 2.0-RC1