diff options
Diffstat (limited to 'src/tools/perf/builtin-kvm.c')
| -rw-r--r-- | src/tools/perf/builtin-kvm.c | 1735 |
1 files changed, 0 insertions, 1735 deletions
diff --git a/src/tools/perf/builtin-kvm.c b/src/tools/perf/builtin-kvm.c deleted file mode 100644 index fbc2888..0000000 --- a/src/tools/perf/builtin-kvm.c +++ /dev/null @@ -1,1735 +0,0 @@ -#include "builtin.h" -#include "perf.h" - -#include "util/evsel.h" -#include "util/evlist.h" -#include "util/util.h" -#include "util/cache.h" -#include "util/symbol.h" -#include "util/thread.h" -#include "util/header.h" -#include "util/session.h" -#include "util/intlist.h" -#include "util/parse-options.h" -#include "util/trace-event.h" -#include "util/debug.h" -#include <lk/debugfs.h> -#include "util/tool.h" -#include "util/stat.h" -#include "util/top.h" - -#include <sys/prctl.h> -#include <sys/timerfd.h> - -#include <termios.h> -#include <semaphore.h> -#include <pthread.h> -#include <math.h> - -#if defined(__i386__) || defined(__x86_64__) -#include <asm/svm.h> -#include <asm/vmx.h> -#include <asm/kvm.h> - -struct event_key { - #define INVALID_KEY (~0ULL) - u64 key; - int info; -}; - -struct kvm_event_stats { - u64 time; - struct stats stats; -}; - -struct kvm_event { - struct list_head hash_entry; - struct rb_node rb; - - struct event_key key; - - struct kvm_event_stats total; - - #define DEFAULT_VCPU_NUM 8 - int max_vcpu; - struct kvm_event_stats *vcpu; -}; - -typedef int (*key_cmp_fun)(struct kvm_event*, struct kvm_event*, int); - -struct kvm_event_key { - const char *name; - key_cmp_fun key; -}; - - -struct perf_kvm_stat; - -struct kvm_events_ops { - bool (*is_begin_event)(struct perf_evsel *evsel, - struct perf_sample *sample, - struct event_key *key); - bool (*is_end_event)(struct perf_evsel *evsel, - struct perf_sample *sample, struct event_key *key); - void (*decode_key)(struct perf_kvm_stat *kvm, struct event_key *key, - char decode[20]); - const char *name; -}; - -struct exit_reasons_table { - unsigned long exit_code; - const char *reason; -}; - -#define EVENTS_BITS 12 -#define EVENTS_CACHE_SIZE (1UL << EVENTS_BITS) - -struct perf_kvm_stat { - struct perf_tool tool; - struct perf_record_opts opts; - struct perf_evlist *evlist; - struct perf_session *session; - - const char *file_name; - const char *report_event; - const char *sort_key; - int trace_vcpu; - - struct exit_reasons_table *exit_reasons; - int exit_reasons_size; - const char *exit_reasons_isa; - - struct kvm_events_ops *events_ops; - key_cmp_fun compare; - struct list_head kvm_events_cache[EVENTS_CACHE_SIZE]; - - u64 total_time; - u64 total_count; - u64 lost_events; - u64 duration; - - const char *pid_str; - struct intlist *pid_list; - - struct rb_root result; - - int timerfd; - unsigned int display_time; - bool live; -}; - - -static void exit_event_get_key(struct perf_evsel *evsel, - struct perf_sample *sample, - struct event_key *key) -{ - key->info = 0; - key->key = perf_evsel__intval(evsel, sample, "exit_reason"); -} - -static bool kvm_exit_event(struct perf_evsel *evsel) -{ - return !strcmp(evsel->name, "kvm:kvm_exit"); -} - -static bool exit_event_begin(struct perf_evsel *evsel, - struct perf_sample *sample, struct event_key *key) -{ - if (kvm_exit_event(evsel)) { - exit_event_get_key(evsel, sample, key); - return true; - } - - return false; -} - -static bool kvm_entry_event(struct perf_evsel *evsel) -{ - return !strcmp(evsel->name, "kvm:kvm_entry"); -} - -static bool exit_event_end(struct perf_evsel *evsel, - struct perf_sample *sample __maybe_unused, - struct event_key *key __maybe_unused) -{ - return kvm_entry_event(evsel); -} - -static struct exit_reasons_table vmx_exit_reasons[] = { - VMX_EXIT_REASONS -}; - -static struct exit_reasons_table svm_exit_reasons[] = { - SVM_EXIT_REASONS -}; - -static const char *get_exit_reason(struct perf_kvm_stat *kvm, u64 exit_code) -{ - int i = kvm->exit_reasons_size; - struct exit_reasons_table *tbl = kvm->exit_reasons; - - while (i--) { - if (tbl->exit_code == exit_code) - return tbl->reason; - tbl++; - } - - pr_err("unknown kvm exit code:%lld on %s\n", - (unsigned long long)exit_code, kvm->exit_reasons_isa); - return "UNKNOWN"; -} - -static void exit_event_decode_key(struct perf_kvm_stat *kvm, - struct event_key *key, - char decode[20]) -{ - const char *exit_reason = get_exit_reason(kvm, key->key); - - scnprintf(decode, 20, "%s", exit_reason); -} - -static struct kvm_events_ops exit_events = { - .is_begin_event = exit_event_begin, - .is_end_event = exit_event_end, - .decode_key = exit_event_decode_key, - .name = "VM-EXIT" -}; - -/* - * For the mmio events, we treat: - * the time of MMIO write: kvm_mmio(KVM_TRACE_MMIO_WRITE...) -> kvm_entry - * the time of MMIO read: kvm_exit -> kvm_mmio(KVM_TRACE_MMIO_READ...). - */ -static void mmio_event_get_key(struct perf_evsel *evsel, struct perf_sample *sample, - struct event_key *key) -{ - key->key = perf_evsel__intval(evsel, sample, "gpa"); - key->info = perf_evsel__intval(evsel, sample, "type"); -} - -#define KVM_TRACE_MMIO_READ_UNSATISFIED 0 -#define KVM_TRACE_MMIO_READ 1 -#define KVM_TRACE_MMIO_WRITE 2 - -static bool mmio_event_begin(struct perf_evsel *evsel, - struct perf_sample *sample, struct event_key *key) -{ - /* MMIO read begin event in kernel. */ - if (kvm_exit_event(evsel)) - return true; - - /* MMIO write begin event in kernel. */ - if (!strcmp(evsel->name, "kvm:kvm_mmio") && - perf_evsel__intval(evsel, sample, "type") == KVM_TRACE_MMIO_WRITE) { - mmio_event_get_key(evsel, sample, key); - return true; - } - - return false; -} - -static bool mmio_event_end(struct perf_evsel *evsel, struct perf_sample *sample, - struct event_key *key) -{ - /* MMIO write end event in kernel. */ - if (kvm_entry_event(evsel)) - return true; - - /* MMIO read end event in kernel.*/ - if (!strcmp(evsel->name, "kvm:kvm_mmio") && - perf_evsel__intval(evsel, sample, "type") == KVM_TRACE_MMIO_READ) { - mmio_event_get_key(evsel, sample, key); - return true; - } - - return false; -} - -static void mmio_event_decode_key(struct perf_kvm_stat *kvm __maybe_unused, - struct event_key *key, - char decode[20]) -{ - scnprintf(decode, 20, "%#lx:%s", (unsigned long)key->key, - key->info == KVM_TRACE_MMIO_WRITE ? "W" : "R"); -} - -static struct kvm_events_ops mmio_events = { - .is_begin_event = mmio_event_begin, - .is_end_event = mmio_event_end, - .decode_key = mmio_event_decode_key, - .name = "MMIO Access" -}; - - /* The time of emulation pio access is from kvm_pio to kvm_entry. */ -static void ioport_event_get_key(struct perf_evsel *evsel, - struct perf_sample *sample, - struct event_key *key) -{ - key->key = perf_evsel__intval(evsel, sample, "port"); - key->info = perf_evsel__intval(evsel, sample, "rw"); -} - -static bool ioport_event_begin(struct perf_evsel *evsel, - struct perf_sample *sample, - struct event_key *key) -{ - if (!strcmp(evsel->name, "kvm:kvm_pio")) { - ioport_event_get_key(evsel, sample, key); - return true; - } - - return false; -} - -static bool ioport_event_end(struct perf_evsel *evsel, - struct perf_sample *sample __maybe_unused, - struct event_key *key __maybe_unused) -{ - return kvm_entry_event(evsel); -} - -static void ioport_event_decode_key(struct perf_kvm_stat *kvm __maybe_unused, - struct event_key *key, - char decode[20]) -{ - scnprintf(decode, 20, "%#llx:%s", (unsigned long long)key->key, - key->info ? "POUT" : "PIN"); -} - -static struct kvm_events_ops ioport_events = { - .is_begin_event = ioport_event_begin, - .is_end_event = ioport_event_end, - .decode_key = ioport_event_decode_key, - .name = "IO Port Access" -}; - -static bool register_kvm_events_ops(struct perf_kvm_stat *kvm) -{ - bool ret = true; - - if (!strcmp(kvm->report_event, "vmexit")) - kvm->events_ops = &exit_events; - else if (!strcmp(kvm->report_event, "mmio")) - kvm->events_ops = &mmio_events; - else if (!strcmp(kvm->report_event, "ioport")) - kvm->events_ops = &ioport_events; - else { - pr_err("Unknown report event:%s\n", kvm->report_event); - ret = false; - } - - return ret; -} - -struct vcpu_event_record { - int vcpu_id; - u64 start_time; - struct kvm_event *last_event; -}; - - -static void init_kvm_event_record(struct perf_kvm_stat *kvm) -{ - unsigned int i; - - for (i = 0; i < EVENTS_CACHE_SIZE; i++) - INIT_LIST_HEAD(&kvm->kvm_events_cache[i]); -} - -static void clear_events_cache_stats(struct list_head *kvm_events_cache) -{ - struct list_head *head; - struct kvm_event *event; - unsigned int i; - int j; - - for (i = 0; i < EVENTS_CACHE_SIZE; i++) { - head = &kvm_events_cache[i]; - list_for_each_entry(event, head, hash_entry) { - /* reset stats for event */ - event->total.time = 0; - init_stats(&event->total.stats); - - for (j = 0; j < event->max_vcpu; ++j) { - event->vcpu[j].time = 0; - init_stats(&event->vcpu[j].stats); - } - } - } -} - -static int kvm_events_hash_fn(u64 key) -{ - return key & (EVENTS_CACHE_SIZE - 1); -} - -static bool kvm_event_expand(struct kvm_event *event, int vcpu_id) -{ - int old_max_vcpu = event->max_vcpu; - void *prev; - - if (vcpu_id < event->max_vcpu) - return true; - - while (event->max_vcpu <= vcpu_id) - event->max_vcpu += DEFAULT_VCPU_NUM; - - prev = event->vcpu; - event->vcpu = realloc(event->vcpu, - event->max_vcpu * sizeof(*event->vcpu)); - if (!event->vcpu) { - free(prev); - pr_err("Not enough memory\n"); - return false; - } - - memset(event->vcpu + old_max_vcpu, 0, - (event->max_vcpu - old_max_vcpu) * sizeof(*event->vcpu)); - return true; -} - -static struct kvm_event *kvm_alloc_init_event(struct event_key *key) -{ - struct kvm_event *event; - - event = zalloc(sizeof(*event)); - if (!event) { - pr_err("Not enough memory\n"); - return NULL; - } - - event->key = *key; - return event; -} - -static struct kvm_event *find_create_kvm_event(struct perf_kvm_stat *kvm, - struct event_key *key) -{ - struct kvm_event *event; - struct list_head *head; - - BUG_ON(key->key == INVALID_KEY); - - head = &kvm->kvm_events_cache[kvm_events_hash_fn(key->key)]; - list_for_each_entry(event, head, hash_entry) { - if (event->key.key == key->key && event->key.info == key->info) - return event; - } - - event = kvm_alloc_init_event(key); - if (!event) - return NULL; - - list_add(&event->hash_entry, head); - return event; -} - -static bool handle_begin_event(struct perf_kvm_stat *kvm, - struct vcpu_event_record *vcpu_record, - struct event_key *key, u64 timestamp) -{ - struct kvm_event *event = NULL; - - if (key->key != INVALID_KEY) - event = find_create_kvm_event(kvm, key); - - vcpu_record->last_event = event; - vcpu_record->start_time = timestamp; - return true; -} - -static void -kvm_update_event_stats(struct kvm_event_stats *kvm_stats, u64 time_diff) -{ - kvm_stats->time += time_diff; - update_stats(&kvm_stats->stats, time_diff); -} - -static double kvm_event_rel_stddev(int vcpu_id, struct kvm_event *event) -{ - struct kvm_event_stats *kvm_stats = &event->total; - - if (vcpu_id != -1) - kvm_stats = &event->vcpu[vcpu_id]; - - return rel_stddev_stats(stddev_stats(&kvm_stats->stats), - avg_stats(&kvm_stats->stats)); -} - -static bool update_kvm_event(struct kvm_event *event, int vcpu_id, - u64 time_diff) -{ - if (vcpu_id == -1) { - kvm_update_event_stats(&event->total, time_diff); - return true; - } - - if (!kvm_event_expand(event, vcpu_id)) - return false; - - kvm_update_event_stats(&event->vcpu[vcpu_id], time_diff); - return true; -} - -static bool handle_end_event(struct perf_kvm_stat *kvm, - struct vcpu_event_record *vcpu_record, - struct event_key *key, - struct perf_sample *sample) -{ - struct kvm_event *event; - u64 time_begin, time_diff; - int vcpu; - - if (kvm->trace_vcpu == -1) - vcpu = -1; - else - vcpu = vcpu_record->vcpu_id; - - event = vcpu_record->last_event; - time_begin = vcpu_record->start_time; - - /* The begin event is not caught. */ - if (!time_begin) - return true; - - /* - * In some case, the 'begin event' only records the start timestamp, - * the actual event is recognized in the 'end event' (e.g. mmio-event). - */ - - /* Both begin and end events did not get the key. */ - if (!event && key->key == INVALID_KEY) - return true; - - if (!event) - event = find_create_kvm_event(kvm, key); - - if (!event) - return false; - - vcpu_record->last_event = NULL; - vcpu_record->start_time = 0; - - /* seems to happen once in a while during live mode */ - if (sample->time < time_begin) { - pr_debug("End time before begin time; skipping event.\n"); - return true; - } - - time_diff = sample->time - time_begin; - - if (kvm->duration && time_diff > kvm->duration) { - char decode[32]; - - kvm->events_ops->decode_key(kvm, &event->key, decode); - if (strcmp(decode, "HLT")) { - pr_info("%" PRIu64 " VM %d, vcpu %d: %s event took %" PRIu64 "usec\n", - sample->time, sample->pid, vcpu_record->vcpu_id, - decode, time_diff/1000); - } - } - - return update_kvm_event(event, vcpu, time_diff); -} - -static -struct vcpu_event_record *per_vcpu_record(struct thread *thread, - struct perf_evsel *evsel, - struct perf_sample *sample) -{ - /* Only kvm_entry records vcpu id. */ - if (!thread->priv && kvm_entry_event(evsel)) { - struct vcpu_event_record *vcpu_record; - - vcpu_record = zalloc(sizeof(*vcpu_record)); - if (!vcpu_record) { - pr_err("%s: Not enough memory\n", __func__); - return NULL; - } - - vcpu_record->vcpu_id = perf_evsel__intval(evsel, sample, "vcpu_id"); - thread->priv = vcpu_record; - } - - return thread->priv; -} - -static bool handle_kvm_event(struct perf_kvm_stat *kvm, - struct thread *thread, - struct perf_evsel *evsel, - struct perf_sample *sample) -{ - struct vcpu_event_record *vcpu_record; - struct event_key key = {.key = INVALID_KEY}; - - vcpu_record = per_vcpu_record(thread, evsel, sample); - if (!vcpu_record) - return true; - - /* only process events for vcpus user cares about */ - if ((kvm->trace_vcpu != -1) && - (kvm->trace_vcpu != vcpu_record->vcpu_id)) - return true; - - if (kvm->events_ops->is_begin_event(evsel, sample, &key)) - return handle_begin_event(kvm, vcpu_record, &key, sample->time); - - if (kvm->events_ops->is_end_event(evsel, sample, &key)) - return handle_end_event(kvm, vcpu_record, &key, sample); - - return true; -} - -#define GET_EVENT_KEY(func, field) \ -static u64 get_event_ ##func(struct kvm_event *event, int vcpu) \ -{ \ - if (vcpu == -1) \ - return event->total.field; \ - \ - if (vcpu >= event->max_vcpu) \ - return 0; \ - \ - return event->vcpu[vcpu].field; \ -} - -#define COMPARE_EVENT_KEY(func, field) \ -GET_EVENT_KEY(func, field) \ -static int compare_kvm_event_ ## func(struct kvm_event *one, \ - struct kvm_event *two, int vcpu)\ -{ \ - return get_event_ ##func(one, vcpu) > \ - get_event_ ##func(two, vcpu); \ -} - -GET_EVENT_KEY(time, time); -COMPARE_EVENT_KEY(count, stats.n); -COMPARE_EVENT_KEY(mean, stats.mean); -GET_EVENT_KEY(max, stats.max); -GET_EVENT_KEY(min, stats.min); - -#define DEF_SORT_NAME_KEY(name, compare_key) \ - { #name, compare_kvm_event_ ## compare_key } - -static struct kvm_event_key keys[] = { - DEF_SORT_NAME_KEY(sample, count), - DEF_SORT_NAME_KEY(time, mean), - { NULL, NULL } -}; - -static bool select_key(struct perf_kvm_stat *kvm) -{ - int i; - - for (i = 0; keys[i].name; i++) { - if (!strcmp(keys[i].name, kvm->sort_key)) { - kvm->compare = keys[i].key; - return true; - } - } - - pr_err("Unknown compare key:%s\n", kvm->sort_key); - return false; -} - -static void insert_to_result(struct rb_root *result, struct kvm_event *event, - key_cmp_fun bigger, int vcpu) -{ - struct rb_node **rb = &result->rb_node; - struct rb_node *parent = NULL; - struct kvm_event *p; - - while (*rb) { - p = container_of(*rb, struct kvm_event, rb); - parent = *rb; - - if (bigger(event, p, vcpu)) - rb = &(*rb)->rb_left; - else - rb = &(*rb)->rb_right; - } - - rb_link_node(&event->rb, parent, rb); - rb_insert_color(&event->rb, result); -} - -static void -update_total_count(struct perf_kvm_stat *kvm, struct kvm_event *event) -{ - int vcpu = kvm->trace_vcpu; - - kvm->total_count += get_event_count(event, vcpu); - kvm->total_time += get_event_time(event, vcpu); -} - -static bool event_is_valid(struct kvm_event *event, int vcpu) -{ - return !!get_event_count(event, vcpu); -} - -static void sort_result(struct perf_kvm_stat *kvm) -{ - unsigned int i; - int vcpu = kvm->trace_vcpu; - struct kvm_event *event; - - for (i = 0; i < EVENTS_CACHE_SIZE; i++) { - list_for_each_entry(event, &kvm->kvm_events_cache[i], hash_entry) { - if (event_is_valid(event, vcpu)) { - update_total_count(kvm, event); - insert_to_result(&kvm->result, event, - kvm->compare, vcpu); - } - } - } -} - -/* returns left most element of result, and erase it */ -static struct kvm_event *pop_from_result(struct rb_root *result) -{ - struct rb_node *node = rb_first(result); - - if (!node) - return NULL; - - rb_erase(node, result); - return container_of(node, struct kvm_event, rb); -} - -static void print_vcpu_info(struct perf_kvm_stat *kvm) -{ - int vcpu = kvm->trace_vcpu; - - pr_info("Analyze events for "); - - if (kvm->live) { - if (kvm->opts.target.system_wide) - pr_info("all VMs, "); - else if (kvm->opts.target.pid) - pr_info("pid(s) %s, ", kvm->opts.target.pid); - else - pr_info("dazed and confused on what is monitored, "); - } - - if (vcpu == -1) - pr_info("all VCPUs:\n\n"); - else - pr_info("VCPU %d:\n\n", vcpu); -} - -static void show_timeofday(void) -{ - char date[64]; - struct timeval tv; - struct tm ltime; - - gettimeofday(&tv, NULL); - if (localtime_r(&tv.tv_sec, <ime)) { - strftime(date, sizeof(date), "%H:%M:%S", <ime); - pr_info("%s.%06ld", date, tv.tv_usec); - } else - pr_info("00:00:00.000000"); - - return; -} - -static void print_result(struct perf_kvm_stat *kvm) -{ - char decode[20]; - struct kvm_event *event; - int vcpu = kvm->trace_vcpu; - - if (kvm->live) { - puts(CONSOLE_CLEAR); - show_timeofday(); - } - - pr_info("\n\n"); - print_vcpu_info(kvm); - pr_info("%20s ", kvm->events_ops->name); - pr_info("%10s ", "Samples"); - pr_info("%9s ", "Samples%"); - - pr_info("%9s ", "Time%"); - pr_info("%10s ", "Min Time"); - pr_info("%10s ", "Max Time"); - pr_info("%16s ", "Avg time"); - pr_info("\n\n"); - - while ((event = pop_from_result(&kvm->result))) { - u64 ecount, etime, max, min; - - ecount = get_event_count(event, vcpu); - etime = get_event_time(event, vcpu); - max = get_event_max(event, vcpu); - min = get_event_min(event, vcpu); - - kvm->events_ops->decode_key(kvm, &event->key, decode); - pr_info("%20s ", decode); - pr_info("%10llu ", (unsigned long long)ecount); - pr_info("%8.2f%% ", (double)ecount / kvm->total_count * 100); - pr_info("%8.2f%% ", (double)etime / kvm->total_time * 100); - pr_info("%8" PRIu64 "us ", min / 1000); - pr_info("%8" PRIu64 "us ", max / 1000); - pr_info("%9.2fus ( +-%7.2f%% )", (double)etime / ecount/1e3, - kvm_event_rel_stddev(vcpu, event)); - pr_info("\n"); - } - - pr_info("\nTotal Samples:%" PRIu64 ", Total events handled time:%.2fus.\n\n", - kvm->total_count, kvm->total_time / 1e3); - - if (kvm->lost_events) - pr_info("\nLost events: %" PRIu64 "\n\n", kvm->lost_events); -} - -static int process_lost_event(struct perf_tool *tool, - union perf_event *event __maybe_unused, - struct perf_sample *sample __maybe_unused, - struct machine *machine __maybe_unused) -{ - struct perf_kvm_stat *kvm = container_of(tool, struct perf_kvm_stat, tool); - - kvm->lost_events++; - return 0; -} - -static bool skip_sample(struct perf_kvm_stat *kvm, - struct perf_sample *sample) -{ - if (kvm->pid_list && intlist__find(kvm->pid_list, sample->pid) == NULL) - return true; - - return false; -} - -static int process_sample_event(struct perf_tool *tool, - union perf_event *event, - struct perf_sample *sample, - struct perf_evsel *evsel, - struct machine *machine) -{ - struct thread *thread; - struct perf_kvm_stat *kvm = container_of(tool, struct perf_kvm_stat, - tool); - - if (skip_sample(kvm, sample)) - return 0; - - thread = machine__findnew_thread(machine, sample->pid, sample->tid); - if (thread == NULL) { - pr_debug("problem processing %d event, skipping it.\n", - event->header.type); - return -1; - } - - if (!handle_kvm_event(kvm, thread, evsel, sample)) - return -1; - - return 0; -} - -static int cpu_isa_config(struct perf_kvm_stat *kvm) -{ - char buf[64], *cpuid; - int err, isa; - - if (kvm->live) { - err = get_cpuid(buf, sizeof(buf)); - if (err != 0) { - pr_err("Failed to look up CPU type (Intel or AMD)\n"); - return err; - } - cpuid = buf; - } else - cpuid = kvm->session->header.env.cpuid; - - if (strstr(cpuid, "Intel")) - isa = 1; - else if (strstr(cpuid, "AMD")) - isa = 0; - else { - pr_err("CPU %s is not supported.\n", cpuid); - return -ENOTSUP; - } - - if (isa == 1) { - kvm->exit_reasons = vmx_exit_reasons; - kvm->exit_reasons_size = ARRAY_SIZE(vmx_exit_reasons); - kvm->exit_reasons_isa = "VMX"; - } - - return 0; -} - -static bool verify_vcpu(int vcpu) -{ - if (vcpu != -1 && vcpu < 0) { - pr_err("Invalid vcpu:%d.\n", vcpu); - return false; - } - - return true; -} - -/* keeping the max events to a modest level to keep - * the processing of samples per mmap smooth. - */ -#define PERF_KVM__MAX_EVENTS_PER_MMAP 25 - -static s64 perf_kvm__mmap_read_idx(struct perf_kvm_stat *kvm, int idx, - u64 *mmap_time) -{ - union perf_event *event; - struct perf_sample sample; - s64 n = 0; - int err; - - *mmap_time = ULLONG_MAX; - while ((event = perf_evlist__mmap_read(kvm->evlist, idx)) != NULL) { - err = perf_evlist__parse_sample(kvm->evlist, event, &sample); - if (err) { - perf_evlist__mmap_consume(kvm->evlist, idx); - pr_err("Failed to parse sample\n"); - return -1; - } - - err = perf_session_queue_event(kvm->session, event, &sample, 0); - /* - * FIXME: Here we can't consume the event, as perf_session_queue_event will - * point to it, and it'll get possibly overwritten by the kernel. - */ - perf_evlist__mmap_consume(kvm->evlist, idx); - - if (err) { - pr_err("Failed to enqueue sample: %d\n", err); - return -1; - } - - /* save time stamp of our first sample for this mmap */ - if (n == 0) - *mmap_time = sample.time; - - /* limit events per mmap handled all at once */ - n++; - if (n == PERF_KVM__MAX_EVENTS_PER_MMAP) - break; - } - - return n; -} - -static int perf_kvm__mmap_read(struct perf_kvm_stat *kvm) -{ - int i, err, throttled = 0; - s64 n, ntotal = 0; - u64 flush_time = ULLONG_MAX, mmap_time; - - for (i = 0; i < kvm->evlist->nr_mmaps; i++) { - n = perf_kvm__mmap_read_idx(kvm, i, &mmap_time); - if (n < 0) - return -1; - - /* flush time is going to be the minimum of all the individual - * mmap times. Essentially, we flush all the samples queued up - * from the last pass under our minimal start time -- that leaves - * a very small race for samples to come in with a lower timestamp. - * The ioctl to return the perf_clock timestamp should close the - * race entirely. - */ - if (mmap_time < flush_time) - flush_time = mmap_time; - - ntotal += n; - if (n == PERF_KVM__MAX_EVENTS_PER_MMAP) - throttled = 1; - } - - /* flush queue after each round in which we processed events */ - if (ntotal) { - kvm->session->ordered_samples.next_flush = flush_time; - err = kvm->tool.finished_round(&kvm->tool, NULL, kvm->session); - if (err) { - if (kvm->lost_events) - pr_info("\nLost events: %" PRIu64 "\n\n", - kvm->lost_events); - return err; - } - } - - return throttled; -} - -static volatile int done; - -static void sig_handler(int sig __maybe_unused) -{ - done = 1; -} - -static int perf_kvm__timerfd_create(struct perf_kvm_stat *kvm) -{ - struct itimerspec new_value; - int rc = -1; - - kvm->timerfd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK); - if (kvm->timerfd < 0) { - pr_err("timerfd_create failed\n"); - goto out; - } - - new_value.it_value.tv_sec = kvm->display_time; - new_value.it_value.tv_nsec = 0; - new_value.it_interval.tv_sec = kvm->display_time; - new_value.it_interval.tv_nsec = 0; - - if (timerfd_settime(kvm->timerfd, 0, &new_value, NULL) != 0) { - pr_err("timerfd_settime failed: %d\n", errno); - close(kvm->timerfd); - goto out; - } - - rc = 0; -out: - return rc; -} - -static int perf_kvm__handle_timerfd(struct perf_kvm_stat *kvm) -{ - uint64_t c; - int rc; - - rc = read(kvm->timerfd, &c, sizeof(uint64_t)); - if (rc < 0) { - if (errno == EAGAIN) - return 0; - - pr_err("Failed to read timer fd: %d\n", errno); - return -1; - } - - if (rc != sizeof(uint64_t)) { - pr_err("Error reading timer fd - invalid size returned\n"); - return -1; - } - - if (c != 1) - pr_debug("Missed timer beats: %" PRIu64 "\n", c-1); - - /* update display */ - sort_result(kvm); - print_result(kvm); - - /* reset counts */ - clear_events_cache_stats(kvm->kvm_events_cache); - kvm->total_count = 0; - kvm->total_time = 0; - kvm->lost_events = 0; - - return 0; -} - -static int fd_set_nonblock(int fd) -{ - long arg = 0; - - arg = fcntl(fd, F_GETFL); - if (arg < 0) { - pr_err("Failed to get current flags for fd %d\n", fd); - return -1; - } - - if (fcntl(fd, F_SETFL, arg | O_NONBLOCK) < 0) { - pr_err("Failed to set non-block option on fd %d\n", fd); - return -1; - } - - return 0; -} - -static -int perf_kvm__handle_stdin(struct termios *tc_now, struct termios *tc_save) -{ - int c; - - tcsetattr(0, TCSANOW, tc_now); - c = getc(stdin); - tcsetattr(0, TCSAFLUSH, tc_save); - - if (c == 'q') - return 1; - - return 0; -} - -static int kvm_events_live_report(struct perf_kvm_stat *kvm) -{ - struct pollfd *pollfds = NULL; - int nr_fds, nr_stdin, ret, err = -EINVAL; - struct termios tc, save; - - /* live flag must be set first */ - kvm->live = true; - - ret = cpu_isa_config(kvm); - if (ret < 0) - return ret; - - if (!verify_vcpu(kvm->trace_vcpu) || - !select_key(kvm) || - !register_kvm_events_ops(kvm)) { - goto out; - } - - init_kvm_event_record(kvm); - - tcgetattr(0, &save); - tc = save; - tc.c_lflag &= ~(ICANON | ECHO); - tc.c_cc[VMIN] = 0; - tc.c_cc[VTIME] = 0; - - signal(SIGINT, sig_handler); - signal(SIGTERM, sig_handler); - - /* copy pollfds -- need to add timerfd and stdin */ - nr_fds = kvm->evlist->nr_fds; - pollfds = zalloc(sizeof(struct pollfd) * (nr_fds + 2)); - if (!pollfds) { - err = -ENOMEM; - goto out; - } - memcpy(pollfds, kvm->evlist->pollfd, - sizeof(struct pollfd) * kvm->evlist->nr_fds); - - /* add timer fd */ - if (perf_kvm__timerfd_create(kvm) < 0) { - err = -1; - goto out; - } - - pollfds[nr_fds].fd = kvm->timerfd; - pollfds[nr_fds].events = POLLIN; - nr_fds++; - - pollfds[nr_fds].fd = fileno(stdin); - pollfds[nr_fds].events = POLLIN; - nr_stdin = nr_fds; - nr_fds++; - if (fd_set_nonblock(fileno(stdin)) != 0) - goto out; - - /* everything is good - enable the events and process */ - perf_evlist__enable(kvm->evlist); - - while (!done) { - int rc; - - rc = perf_kvm__mmap_read(kvm); - if (rc < 0) - break; - - err = perf_kvm__handle_timerfd(kvm); - if (err) - goto out; - - if (pollfds[nr_stdin].revents & POLLIN) - done = perf_kvm__handle_stdin(&tc, &save); - - if (!rc && !done) - err = poll(pollfds, nr_fds, 100); - } - - perf_evlist__disable(kvm->evlist); - - if (err == 0) { - sort_result(kvm); - print_result(kvm); - } - -out: - if (kvm->timerfd >= 0) - close(kvm->timerfd); - - if (pollfds) - free(pollfds); - - return err; -} - -static int kvm_live_open_events(struct perf_kvm_stat *kvm) -{ - int err, rc = -1; - struct perf_evsel *pos; - struct perf_evlist *evlist = kvm->evlist; - - perf_evlist__config(evlist, &kvm->opts); - - /* - * Note: exclude_{guest,host} do not apply here. - * This command processes KVM tracepoints from host only - */ - list_for_each_entry(pos, &evlist->entries, node) { - struct perf_event_attr *attr = &pos->attr; - - /* make sure these *are* set */ - perf_evsel__set_sample_bit(pos, TID); - perf_evsel__set_sample_bit(pos, TIME); - perf_evsel__set_sample_bit(pos, CPU); - perf_evsel__set_sample_bit(pos, RAW); - /* make sure these are *not*; want as small a sample as possible */ - perf_evsel__reset_sample_bit(pos, PERIOD); - perf_evsel__reset_sample_bit(pos, IP); - perf_evsel__reset_sample_bit(pos, CALLCHAIN); - perf_evsel__reset_sample_bit(pos, ADDR); - perf_evsel__reset_sample_bit(pos, READ); - attr->mmap = 0; - attr->comm = 0; - attr->task = 0; - - attr->sample_period = 1; - - attr->watermark = 0; - attr->wakeup_events = 1000; - - /* will enable all once we are ready */ - attr->disabled = 1; - } - - err = perf_evlist__open(evlist); - if (err < 0) { - printf("Couldn't create the events: %s\n", strerror(errno)); - goto out; - } - - if (perf_evlist__mmap(evlist, kvm->opts.mmap_pages, false) < 0) { - ui__error("Failed to mmap the events: %s\n", strerror(errno)); - perf_evlist__close(evlist); - goto out; - } - - rc = 0; - -out: - return rc; -} - -static int read_events(struct perf_kvm_stat *kvm) -{ - int ret; - - struct perf_tool eops = { - .sample = process_sample_event, - .comm = perf_event__process_comm, - .ordered_samples = true, - }; - - kvm->tool = eops; - kvm->session = perf_session__new(kvm->file_name, O_RDONLY, 0, false, - &kvm->tool); - if (!kvm->session) { - pr_err("Initializing perf session failed\n"); - return -EINVAL; - } - - if (!perf_session__has_traces(kvm->session, "kvm record")) - return -EINVAL; - - /* - * Do not use 'isa' recorded in kvm_exit tracepoint since it is not - * traced in the old kernel. - */ - ret = cpu_isa_config(kvm); - if (ret < 0) - return ret; - - return perf_session__process_events(kvm->session, &kvm->tool); -} - -static int parse_target_str(struct perf_kvm_stat *kvm) -{ - if (kvm->pid_str) { - kvm->pid_list = intlist__new(kvm->pid_str); - if (kvm->pid_list == NULL) { - pr_err("Error parsing process id string\n"); - return -EINVAL; - } - } - - return 0; -} - -static int kvm_events_report_vcpu(struct perf_kvm_stat *kvm) -{ - int ret = -EINVAL; - int vcpu = kvm->trace_vcpu; - - if (parse_target_str(kvm) != 0) - goto exit; - - if (!verify_vcpu(vcpu)) - goto exit; - - if (!select_key(kvm)) - goto exit; - - if (!register_kvm_events_ops(kvm)) - goto exit; - - init_kvm_event_record(kvm); - setup_pager(); - - ret = read_events(kvm); - if (ret) - goto exit; - - sort_result(kvm); - print_result(kvm); - -exit: - return ret; -} - -static const char * const kvm_events_tp[] = { - "kvm:kvm_entry", - "kvm:kvm_exit", - "kvm:kvm_mmio", - "kvm:kvm_pio", -}; - -#define STRDUP_FAIL_EXIT(s) \ - ({ char *_p; \ - _p = strdup(s); \ - if (!_p) \ - return -ENOMEM; \ - _p; \ - }) - -static int -kvm_events_record(struct perf_kvm_stat *kvm, int argc, const char **argv) -{ - unsigned int rec_argc, i, j; - const char **rec_argv; - const char * const record_args[] = { - "record", - "-R", - "-m", "1024", - "-c", "1", - }; - - rec_argc = ARRAY_SIZE(record_args) + argc + 2 + - 2 * ARRAY_SIZE(kvm_events_tp); - rec_argv = calloc(rec_argc + 1, sizeof(char *)); - - if (rec_argv == NULL) - return -ENOMEM; - - for (i = 0; i < ARRAY_SIZE(record_args); i++) - rec_argv[i] = STRDUP_FAIL_EXIT(record_args[i]); - - for (j = 0; j < ARRAY_SIZE(kvm_events_tp); j++) { - rec_argv[i++] = "-e"; - rec_argv[i++] = STRDUP_FAIL_EXIT(kvm_events_tp[j]); - } - - rec_argv[i++] = STRDUP_FAIL_EXIT("-o"); - rec_argv[i++] = STRDUP_FAIL_EXIT(kvm->file_name); - - for (j = 1; j < (unsigned int)argc; j++, i++) - rec_argv[i] = argv[j]; - - return cmd_record(i, rec_argv, NULL); -} - -static int -kvm_events_report(struct perf_kvm_stat *kvm, int argc, const char **argv) -{ - const struct option kvm_events_report_options[] = { - OPT_STRING(0, "event", &kvm->report_event, "report event", - "event for reporting: vmexit, mmio, ioport"), - OPT_INTEGER(0, "vcpu", &kvm->trace_vcpu, - "vcpu id to report"), - OPT_STRING('k', "key", &kvm->sort_key, "sort-key", - "key for sorting: sample(sort by samples number)" - " time (sort by avg time)"), - OPT_STRING('p', "pid", &kvm->pid_str, "pid", - "analyze events only for given process id(s)"), - OPT_END() - }; - - const char * const kvm_events_report_usage[] = { - "perf kvm stat report [<options>]", - NULL - }; - - symbol__init(); - - if (argc) { - argc = parse_options(argc, argv, - kvm_events_report_options, - kvm_events_report_usage, 0); - if (argc) - usage_with_options(kvm_events_report_usage, - kvm_events_report_options); - } - - return kvm_events_report_vcpu(kvm); -} - -static struct perf_evlist *kvm_live_event_list(void) -{ - struct perf_evlist *evlist; - char *tp, *name, *sys; - unsigned int j; - int err = -1; - - evlist = perf_evlist__new(); - if (evlist == NULL) - return NULL; - - for (j = 0; j < ARRAY_SIZE(kvm_events_tp); j++) { - - tp = strdup(kvm_events_tp[j]); - if (tp == NULL) - goto out; - - /* split tracepoint into subsystem and name */ - sys = tp; - name = strchr(tp, ':'); - if (name == NULL) { - pr_err("Error parsing %s tracepoint: subsystem delimiter not found\n", - kvm_events_tp[j]); - free(tp); - goto out; - } - *name = '\0'; - name++; - - if (perf_evlist__add_newtp(evlist, sys, name, NULL)) { - pr_err("Failed to add %s tracepoint to the list\n", kvm_events_tp[j]); - free(tp); - goto out; - } - - free(tp); - } - - err = 0; - -out: - if (err) { - perf_evlist__delete(evlist); - evlist = NULL; - } - - return evlist; -} - -static int kvm_events_live(struct perf_kvm_stat *kvm, - int argc, const char **argv) -{ - char errbuf[BUFSIZ]; - int err; - - const struct option live_options[] = { - OPT_STRING('p', "pid", &kvm->opts.target.pid, "pid", - "record events on existing process id"), - OPT_UINTEGER('m', "mmap-pages", &kvm->opts.mmap_pages, - "number of mmap data pages"), - OPT_INCR('v', "verbose", &verbose, - "be more verbose (show counter open errors, etc)"), - OPT_BOOLEAN('a', "all-cpus", &kvm->opts.target.system_wide, - "system-wide collection from all CPUs"), - OPT_UINTEGER('d', "display", &kvm->display_time, - "time in seconds between display updates"), - OPT_STRING(0, "event", &kvm->report_event, "report event", - "event for reporting: vmexit, mmio, ioport"), - OPT_INTEGER(0, "vcpu", &kvm->trace_vcpu, - "vcpu id to report"), - OPT_STRING('k', "key", &kvm->sort_key, "sort-key", - "key for sorting: sample(sort by samples number)" - " time (sort by avg time)"), - OPT_U64(0, "duration", &kvm->duration, - "show events other than HALT that take longer than duration usecs"), - OPT_END() - }; - const char * const live_usage[] = { - "perf kvm stat live [<options>]", - NULL - }; - - - /* event handling */ - kvm->tool.sample = process_sample_event; - kvm->tool.comm = perf_event__process_comm; - kvm->tool.exit = perf_event__process_exit; - kvm->tool.fork = perf_event__process_fork; - kvm->tool.lost = process_lost_event; - kvm->tool.ordered_samples = true; - perf_tool__fill_defaults(&kvm->tool); - - /* set defaults */ - kvm->display_time = 1; - kvm->opts.user_interval = 1; - kvm->opts.mmap_pages = 512; - kvm->opts.target.uses_mmap = false; - kvm->opts.target.uid_str = NULL; - kvm->opts.target.uid = UINT_MAX; - - symbol__init(); - disable_buildid_cache(); - - use_browser = 0; - setup_browser(false); - - if (argc) { - argc = parse_options(argc, argv, live_options, - live_usage, 0); - if (argc) - usage_with_options(live_usage, live_options); - } - - kvm->duration *= NSEC_PER_USEC; /* convert usec to nsec */ - - /* - * target related setups - */ - err = perf_target__validate(&kvm->opts.target); - if (err) { - perf_target__strerror(&kvm->opts.target, err, errbuf, BUFSIZ); - ui__warning("%s", errbuf); - } - - if (perf_target__none(&kvm->opts.target)) - kvm->opts.target.system_wide = true; - - - /* - * generate the event list - */ - kvm->evlist = kvm_live_event_list(); - if (kvm->evlist == NULL) { - err = -1; - goto out; - } - - symbol_conf.nr_events = kvm->evlist->nr_entries; - - if (perf_evlist__create_maps(kvm->evlist, &kvm->opts.target) < 0) - usage_with_options(live_usage, live_options); - - /* - * perf session - */ - kvm->session = perf_session__new(NULL, O_WRONLY, false, false, &kvm->tool); - if (kvm->session == NULL) { - err = -ENOMEM; - goto out; - } - kvm->session->evlist = kvm->evlist; - perf_session__set_id_hdr_size(kvm->session); - - - if (perf_target__has_task(&kvm->opts.target)) - perf_event__synthesize_thread_map(&kvm->tool, - kvm->evlist->threads, - perf_event__process, - &kvm->session->machines.host); - else - perf_event__synthesize_threads(&kvm->tool, perf_event__process, - &kvm->session->machines.host); - - - err = kvm_live_open_events(kvm); - if (err) - goto out; - - err = kvm_events_live_report(kvm); - -out: - exit_browser(0); - - if (kvm->session) - perf_session__delete(kvm->session); - kvm->session = NULL; - if (kvm->evlist) { - perf_evlist__delete_maps(kvm->evlist); - perf_evlist__delete(kvm->evlist); - } - - return err; -} - -static void print_kvm_stat_usage(void) -{ - printf("Usage: perf kvm stat <command>\n\n"); - - printf("# Available commands:\n"); - printf("\trecord: record kvm events\n"); - printf("\treport: report statistical data of kvm events\n"); - printf("\tlive: live reporting of statistical data of kvm events\n"); - - printf("\nOtherwise, it is the alias of 'perf stat':\n"); -} - -static int kvm_cmd_stat(const char *file_name, int argc, const char **argv) -{ - struct perf_kvm_stat kvm = { - .file_name = file_name, - - .trace_vcpu = -1, - .report_event = "vmexit", - .sort_key = "sample", - - .exit_reasons = svm_exit_reasons, - .exit_reasons_size = ARRAY_SIZE(svm_exit_reasons), - .exit_reasons_isa = "SVM", - }; - - if (argc == 1) { - print_kvm_stat_usage(); - goto perf_stat; - } - - if (!strncmp(argv[1], "rec", 3)) - return kvm_events_record(&kvm, argc - 1, argv + 1); - - if (!strncmp(argv[1], "rep", 3)) - return kvm_events_report(&kvm, argc - 1 , argv + 1); - - if (!strncmp(argv[1], "live", 4)) - return kvm_events_live(&kvm, argc - 1 , argv + 1); - -perf_stat: - return cmd_stat(argc, argv, NULL); -} -#endif - -static int __cmd_record(const char *file_name, int argc, const char **argv) -{ - int rec_argc, i = 0, j; - const char **rec_argv; - - rec_argc = argc + 2; - rec_argv = calloc(rec_argc + 1, sizeof(char *)); - rec_argv[i++] = strdup("record"); - rec_argv[i++] = strdup("-o"); - rec_argv[i++] = strdup(file_name); - for (j = 1; j < argc; j++, i++) - rec_argv[i] = argv[j]; - - BUG_ON(i != rec_argc); - - return cmd_record(i, rec_argv, NULL); -} - -static int __cmd_report(const char *file_name, int argc, const char **argv) -{ - int rec_argc, i = 0, j; - const char **rec_argv; - - rec_argc = argc + 2; - rec_argv = calloc(rec_argc + 1, sizeof(char *)); - rec_argv[i++] = strdup("report"); - rec_argv[i++] = strdup("-i"); - rec_argv[i++] = strdup(file_name); - for (j = 1; j < argc; j++, i++) - rec_argv[i] = argv[j]; - - BUG_ON(i != rec_argc); - - return cmd_report(i, rec_argv, NULL); -} - -static int -__cmd_buildid_list(const char *file_name, int argc, const char **argv) -{ - int rec_argc, i = 0, j; - const char **rec_argv; - - rec_argc = argc + 2; - rec_argv = calloc(rec_argc + 1, sizeof(char *)); - rec_argv[i++] = strdup("buildid-list"); - rec_argv[i++] = strdup("-i"); - rec_argv[i++] = strdup(file_name); - for (j = 1; j < argc; j++, i++) - rec_argv[i] = argv[j]; - - BUG_ON(i != rec_argc); - - return cmd_buildid_list(i, rec_argv, NULL); -} - -int cmd_kvm(int argc, const char **argv, const char *prefix __maybe_unused) -{ - const char *file_name = NULL; - const struct option kvm_options[] = { - OPT_STRING('i', "input", &file_name, "file", - "Input file name"), - OPT_STRING('o', "output", &file_name, "file", - "Output file name"), - OPT_BOOLEAN(0, "guest", &perf_guest, - "Collect guest os data"), - OPT_BOOLEAN(0, "host", &perf_host, - "Collect host os data"), - OPT_STRING(0, "guestmount", &symbol_conf.guestmount, "directory", - "guest mount directory under which every guest os" - " instance has a subdir"), - OPT_STRING(0, "guestvmlinux", &symbol_conf.default_guest_vmlinux_name, - "file", "file saving guest os vmlinux"), - OPT_STRING(0, "guestkallsyms", &symbol_conf.default_guest_kallsyms, - "file", "file saving guest os /proc/kallsyms"), - OPT_STRING(0, "guestmodules", &symbol_conf.default_guest_modules, - "file", "file saving guest os /proc/modules"), - OPT_END() - }; - - - const char * const kvm_usage[] = { - "perf kvm [<options>] {top|record|report|diff|buildid-list|stat}", - NULL - }; - - perf_host = 0; - perf_guest = 1; - - argc = parse_options(argc, argv, kvm_options, kvm_usage, - PARSE_OPT_STOP_AT_NON_OPTION); - if (!argc) - usage_with_options(kvm_usage, kvm_options); - - if (!perf_host) - perf_guest = 1; - - if (!file_name) { - if (perf_host && !perf_guest) - file_name = strdup("perf.data.host"); - else if (!perf_host && perf_guest) - file_name = strdup("perf.data.guest"); - else - file_name = strdup("perf.data.kvm"); - - if (!file_name) { - pr_err("Failed to allocate memory for filename\n"); - return -ENOMEM; - } - } - - if (!strncmp(argv[0], "rec", 3)) - return __cmd_record(file_name, argc, argv); - else if (!strncmp(argv[0], "rep", 3)) - return __cmd_report(file_name, argc, argv); - else if (!strncmp(argv[0], "diff", 4)) - return cmd_diff(argc, argv, NULL); - else if (!strncmp(argv[0], "top", 3)) - return cmd_top(argc, argv, NULL); - else if (!strncmp(argv[0], "buildid-list", 12)) - return __cmd_buildid_list(file_name, argc, argv); -#if defined(__i386__) || defined(__x86_64__) - else if (!strncmp(argv[0], "stat", 4)) - return kvm_cmd_stat(file_name, argc, argv); -#endif - else - usage_with_options(kvm_usage, kvm_options); - - return 0; -} |