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linux/tools/perf/builtin-kvm.c

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#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 <subcmd/parse-options.h>
#include "util/trace-event.h"
#include "util/debug.h"
#include "util/tool.h"
#include "util/stat.h"
#include "util/top.h"
#include "util/data.h"
#include "util/ordered-events.h"
#include <sys/prctl.h>
#ifdef HAVE_TIMERFD_SUPPORT
#include <sys/timerfd.h>
#endif
#include <linux/time64.h>
#include <termios.h>
#include <semaphore.h>
#include <pthread.h>
#include <math.h>
#ifdef HAVE_KVM_STAT_SUPPORT
#include "util/kvm-stat.h"
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, kvm_exit_reason);
}
bool kvm_exit_event(struct perf_evsel *evsel)
{
return !strcmp(evsel->name, kvm_exit_trace);
}
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;
}
bool kvm_entry_event(struct perf_evsel *evsel)
{
return !strcmp(evsel->name, kvm_entry_trace);
}
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 const char *get_exit_reason(struct perf_kvm_stat *kvm,
struct exit_reasons_table *tbl,
u64 exit_code)
{
while (tbl->reason != NULL) {
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";
}
void exit_event_decode_key(struct perf_kvm_stat *kvm,
struct event_key *key,
char *decode)
{
const char *exit_reason = get_exit_reason(kvm, key->exit_reasons,
key->key);
scnprintf(decode, decode_str_len, "%s", exit_reason);
}
static bool register_kvm_events_ops(struct perf_kvm_stat *kvm)
{
struct kvm_reg_events_ops *events_ops = kvm_reg_events_ops;
for (events_ops = kvm_reg_events_ops; events_ops->name; events_ops++) {
if (!strcmp(events_ops->name, kvm->report_event)) {
kvm->events_ops = events_ops->ops;
return true;
}
}
return false;
}
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]);
}
#ifdef HAVE_TIMERFD_SUPPORT
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);
}
}
}
}
#endif
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;
init_stats(&event->total.stats);
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 is_child_event(struct perf_kvm_stat *kvm,
struct perf_evsel *evsel,
struct perf_sample *sample,
struct event_key *key)
{
struct child_event_ops *child_ops;
child_ops = kvm->events_ops->child_ops;
if (!child_ops)
return false;
for (; child_ops->name; child_ops++) {
if (!strcmp(evsel->name, child_ops->name)) {
child_ops->get_key(evsel, sample, key);
return true;
}
}
return false;
}
static bool handle_child_event(struct perf_kvm_stat *kvm,
struct vcpu_event_record *vcpu_record,
struct event_key *key,
struct perf_sample *sample __maybe_unused)
{
struct kvm_event *event = NULL;
if (key->key != INVALID_KEY)
event = find_create_kvm_event(kvm, key);
vcpu_record->last_event = event;
return true;
}
static bool skip_event(const char *event)
{
const char * const *skip_events;
for (skip_events = kvm_skip_events; *skip_events; skip_events++)
if (!strcmp(event, *skip_events))
return true;
return false;
}
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[decode_str_len];
kvm->events_ops->decode_key(kvm, &event->key, decode);
if (!skip_event(decode)) {
pr_info("%" PRIu64 " VM %d, vcpu %d: %s event took %" PRIu64 "usec\n",
sample->time, sample->pid, vcpu_record->vcpu_id,
decode, time_diff / NSEC_PER_USEC);
}
}
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(thread) && 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_str);
thread__set_priv(thread, vcpu_record);
}
return thread__priv(thread);
}
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,
.exit_reasons = kvm->exit_reasons };
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 (is_child_event(kvm, evsel, sample, &key))
return handle_child_event(kvm, vcpu_record, &key, sample);
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->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, &ltime)) {
strftime(date, sizeof(date), "%H:%M:%S", &ltime);
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[decode_str_len];
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("%*s ", decode_str_len, kvm->events_ops->name);
pr_info("%10s ", "Samples");
pr_info("%9s ", "Samples%");
pr_info("%9s ", "Time%");
pr_info("%11s ", "Min Time");
pr_info("%11s ", "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("%*s ", decode_str_len, 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("%9.2fus ", (double)min / NSEC_PER_USEC);
pr_info("%9.2fus ", (double)max / NSEC_PER_USEC);
pr_info("%9.2fus ( +-%7.2f%% )", (double)etime / ecount / NSEC_PER_USEC,
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 / (double)NSEC_PER_USEC);
if (kvm->lost_events)
pr_info("\nLost events: %" PRIu64 "\n\n", kvm->lost_events);
}
#ifdef HAVE_TIMERFD_SUPPORT
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;
}
#endif
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)
{
int err = 0;
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))
err = -1;
thread__put(thread);
return err;
}
static int cpu_isa_config(struct perf_kvm_stat *kvm)
{
char buf[64], *cpuid;
int err;
if (kvm->live) {
err = get_cpuid(buf, sizeof(buf));
if (err != 0) {
pr_err("Failed to look up CPU type\n");
return err;
}
cpuid = buf;
} else
cpuid = kvm->session->header.env.cpuid;
if (!cpuid) {
pr_err("Failed to look up CPU type\n");
return -EINVAL;
}
err = cpu_isa_init(kvm, cpuid);
if (err == -ENOTSUP)
pr_err("CPU %s is not supported.\n", cpuid);
return err;
}
static bool verify_vcpu(int vcpu)
{
if (vcpu != -1 && vcpu < 0) {
pr_err("Invalid vcpu:%d.\n", vcpu);
return false;
}
return true;
}
#ifdef HAVE_TIMERFD_SUPPORT
/* 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) {
struct ordered_events *oe = &kvm->session->ordered_events;
oe->next_flush = flush_time;
err = ordered_events__flush(oe, OE_FLUSH__ROUND);
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(void)
{
int c;
c = getc(stdin);
if (c == 'q')
return 1;
return 0;
}
static int kvm_events_live_report(struct perf_kvm_stat *kvm)
{
int nr_stdin, ret, err = -EINVAL;
struct termios 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;
}
set_term_quiet_input(&save);
init_kvm_event_record(kvm);
signal(SIGINT, sig_handler);
signal(SIGTERM, sig_handler);
/* add timer fd */
if (perf_kvm__timerfd_create(kvm) < 0) {
err = -1;
goto out;
}
if (perf_evlist__add_pollfd(kvm->evlist, kvm->timerfd) < 0)
goto out;
nr_stdin = perf_evlist__add_pollfd(kvm->evlist, fileno(stdin));
if (nr_stdin < 0)
goto out;
if (fd_set_nonblock(fileno(stdin)) != 0)
goto out;
/* everything is good - enable the events and process */
perf_evlist__enable(kvm->evlist);
while (!done) {
struct fdarray *fda = &kvm->evlist->pollfd;
int rc;
rc = perf_kvm__mmap_read(kvm);
if (rc < 0)
break;
err = perf_kvm__handle_timerfd(kvm);
if (err)
goto out;
if (fda->entries[nr_stdin].revents & POLLIN)
done = perf_kvm__handle_stdin();
if (!rc && !done)
err = fdarray__poll(fda, 100);
}
perf_evlist__disable(kvm->evlist);
if (err == 0) {
sort_result(kvm);
print_result(kvm);
}
out:
if (kvm->timerfd >= 0)
close(kvm->timerfd);
tcsetattr(0, TCSAFLUSH, &save);
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;
char sbuf[STRERR_BUFSIZE];
perf_evlist__config(evlist, &kvm->opts, NULL);
/*
* Note: exclude_{guest,host} do not apply here.
* This command processes KVM tracepoints from host only
*/
evlist__for_each_entry(evlist, pos) {
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",
str_error_r(errno, sbuf, sizeof(sbuf)));
goto out;
}
if (perf_evlist__mmap(evlist, kvm->opts.mmap_pages, false) < 0) {
ui__error("Failed to mmap the events: %s\n",
str_error_r(errno, sbuf, sizeof(sbuf)));
perf_evlist__close(evlist);
goto out;
}
rc = 0;
out:
return rc;
}
#endif
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_events = true,
};
struct perf_data_file file = {
.path = kvm->file_name,
.mode = PERF_DATA_MODE_READ,
.force = kvm->force,
};
kvm->tool = eops;
kvm->session = perf_session__new(&file, false, &kvm->tool);
if (!kvm->session) {
pr_err("Initializing perf session failed\n");
return -1;
}
symbol__init(&kvm->session->header.env);
if (!perf_session__has_traces(kvm->session, "kvm record")) {
ret = -EINVAL;
goto out_delete;
}
/*
* 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)
goto out_delete;
ret = perf_session__process_events(kvm->session);
out_delete:
perf_session__delete(kvm->session);
return ret;
}
static int parse_target_str(struct perf_kvm_stat *kvm)
{
if (kvm->opts.target.pid) {
kvm->pid_list = intlist__new(kvm->opts.target.pid);
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;
}
#define STRDUP_FAIL_EXIT(s) \
({ char *_p; \
_p = strdup(s); \
if (!_p) \
return -ENOMEM; \
_p; \
})
int __weak setup_kvm_events_tp(struct perf_kvm_stat *kvm __maybe_unused)
{
return 0;
}
static int
kvm_events_record(struct perf_kvm_stat *kvm, int argc, const char **argv)
{
unsigned int rec_argc, i, j, events_tp_size;
const char **rec_argv;
const char * const record_args[] = {
"record",
"-R",
"-m", "1024",
"-c", "1",
};
const char * const kvm_stat_record_usage[] = {
"perf kvm stat record [<options>]",
NULL
};
const char * const *events_tp;
int ret;
events_tp_size = 0;
ret = setup_kvm_events_tp(kvm);
if (ret < 0) {
pr_err("Unable to setup the kvm tracepoints\n");
return ret;
}
for (events_tp = kvm_events_tp; *events_tp; events_tp++)
events_tp_size++;
rec_argc = ARRAY_SIZE(record_args) + argc + 2 +
2 * events_tp_size;
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 < events_tp_size; 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];
set_option_flag(record_options, 'e', "event", PARSE_OPT_HIDDEN);
set_option_flag(record_options, 0, "filter", PARSE_OPT_HIDDEN);
set_option_flag(record_options, 'R', "raw-samples", PARSE_OPT_HIDDEN);
set_option_flag(record_options, 'F', "freq", PARSE_OPT_DISABLED);
set_option_flag(record_options, 0, "group", PARSE_OPT_DISABLED);
set_option_flag(record_options, 'g', NULL, PARSE_OPT_DISABLED);
set_option_flag(record_options, 0, "call-graph", PARSE_OPT_DISABLED);
set_option_flag(record_options, 'd', "data", PARSE_OPT_DISABLED);
set_option_flag(record_options, 'T', "timestamp", PARSE_OPT_DISABLED);
set_option_flag(record_options, 'P', "period", PARSE_OPT_DISABLED);
set_option_flag(record_options, 'n', "no-samples", PARSE_OPT_DISABLED);
set_option_flag(record_options, 'N', "no-buildid-cache", PARSE_OPT_DISABLED);
set_option_flag(record_options, 'B', "no-buildid", PARSE_OPT_DISABLED);
set_option_flag(record_options, 'G', "cgroup", PARSE_OPT_DISABLED);
set_option_flag(record_options, 'b', "branch-any", PARSE_OPT_DISABLED);
set_option_flag(record_options, 'j', "branch-filter", PARSE_OPT_DISABLED);
set_option_flag(record_options, 'W', "weight", PARSE_OPT_DISABLED);
set_option_flag(record_options, 0, "transaction", PARSE_OPT_DISABLED);
record_usage = kvm_stat_record_usage;
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 (x86 only), ioport (x86 only)"),
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->opts.target.pid, "pid",
"analyze events only for given process id(s)"),
OPT_BOOLEAN('f', "force", &kvm->force, "don't complain, do it"),
OPT_END()
};
const char * const kvm_events_report_usage[] = {
"perf kvm stat report [<options>]",
NULL
};
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);
}
if (!kvm->opts.target.pid)
kvm->opts.target.system_wide = true;
return kvm_events_report_vcpu(kvm);
}
#ifdef HAVE_TIMERFD_SUPPORT
static struct perf_evlist *kvm_live_event_list(void)
{
struct perf_evlist *evlist;
char *tp, *name, *sys;
int err = -1;
const char * const *events_tp;
evlist = perf_evlist__new();
if (evlist == NULL)
return NULL;
for (events_tp = kvm_events_tp; *events_tp; events_tp++) {
tp = strdup(*events_tp);
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",
*events_tp);
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", *events_tp);
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_CALLBACK('m', "mmap-pages", &kvm->opts.mmap_pages, "pages",
"number of mmap data pages",
perf_evlist__parse_mmap_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 (x86 only), ioport (x86 only)"),
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"
" HLT (x86 only) or Wait state (s390 only)"
" that take longer than duration usecs"),
OPT_UINTEGER(0, "proc-map-timeout", &kvm->opts.proc_map_timeout,
"per thread proc mmap processing timeout in ms"),
OPT_END()
};
const char * const live_usage[] = {
"perf kvm stat live [<options>]",
NULL
};
struct perf_data_file file = {
.mode = PERF_DATA_MODE_WRITE,
};
/* 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_events = 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;
kvm->opts.proc_map_timeout = 500;
symbol__init(NULL);
disable_buildid_cache();
use_browser = 0;
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 = target__validate(&kvm->opts.target);
if (err) {
target__strerror(&kvm->opts.target, err, errbuf, BUFSIZ);
ui__warning("%s", errbuf);
}
if (target__none(&kvm->opts.target))
kvm->opts.target.system_wide = true;
/*
* generate the event list
*/
err = setup_kvm_events_tp(kvm);
if (err < 0) {
pr_err("Unable to setup the kvm tracepoints\n");
return err;
}
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(&file, false, &kvm->tool);
if (kvm->session == NULL) {
err = -1;
goto out;
}
kvm->session->evlist = kvm->evlist;
perf_session__set_id_hdr_size(kvm->session);
ordered_events__set_copy_on_queue(&kvm->session->ordered_events, true);
machine__synthesize_threads(&kvm->session->machines.host, &kvm->opts.target,
kvm->evlist->threads, false, kvm->opts.proc_map_timeout);
err = kvm_live_open_events(kvm);
if (err)
goto out;
err = kvm_events_live_report(kvm);
out:
perf_session__delete(kvm->session);
kvm->session = NULL;
perf_evlist__delete(kvm->evlist);
return err;
}
#endif
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",
};
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);
#ifdef HAVE_TIMERFD_SUPPORT
if (!strncmp(argv[1], "live", 4))
return kvm_events_live(&kvm, argc - 1 , argv + 1);
#endif
perf_stat:
return cmd_stat(argc, argv, NULL);
}
#endif /* HAVE_KVM_STAT_SUPPORT */
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_INCR('v', "verbose", &verbose,
"be more verbose (show counter open errors, etc)"),
OPT_END()
};
const char *const kvm_subcommands[] = { "top", "record", "report", "diff",
"buildid-list", "stat", NULL };
const char *kvm_usage[] = { NULL, NULL };
perf_host = 0;
perf_guest = 1;
argc = parse_options_subcommand(argc, argv, kvm_options, kvm_subcommands, 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) {
file_name = get_filename_for_perf_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);
#ifdef HAVE_KVM_STAT_SUPPORT
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;
}
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