mpv/common/stats.c

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#include <pthread.h>
#include <time.h>
#include <unistd.h>
#include "common.h"
#include "global.h"
#include "misc/linked_list.h"
#include "misc/node.h"
#include "msg.h"
#include "options/m_option.h"
#include "osdep/atomic.h"
#include "osdep/timer.h"
#include "stats.h"
struct stats_base {
struct mpv_global *global;
atomic_bool active;
pthread_mutex_t lock;
struct {
struct stats_ctx *head, *tail;
} list;
struct stat_entry **entries;
int num_entries;
int64_t last_time;
};
struct stats_ctx {
struct stats_base *base;
const char *prefix;
struct {
struct stats_ctx *prev, *next;
} list;
struct stat_entry **entries;
int num_entries;
};
enum val_type {
VAL_UNSET = 0,
VAL_STATIC,
VAL_STATIC_SIZE,
VAL_INC,
VAL_TIME,
VAL_THREAD_CPU_TIME,
};
struct stat_entry {
char name[32];
const char *full_name; // including stats_ctx.prefix
enum val_type type;
double val_d;
int64_t val_rt;
int64_t val_th;
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int64_t time_start_ns;
int64_t cpu_start_ns;
pthread_t thread;
};
#define IS_ACTIVE(ctx) \
(atomic_load_explicit(&(ctx)->base->active, memory_order_relaxed))
// Overflows only after I'm dead.
static int64_t get_thread_cpu_time_ns(pthread_t thread)
{
#if defined(_POSIX_TIMERS) && _POSIX_TIMERS > 0 && defined(_POSIX_THREAD_CPUTIME)
clockid_t id;
struct timespec tv;
if (pthread_getcpuclockid(thread, &id) == 0 &&
clock_gettime(id, &tv) == 0)
{
return tv.tv_sec * (1000LL * 1000LL * 1000LL) + tv.tv_nsec;
}
#endif
return 0;
}
static void stats_destroy(void *p)
{
struct stats_base *stats = p;
// All entries must have been destroyed before this.
assert(!stats->list.head);
pthread_mutex_destroy(&stats->lock);
}
void stats_global_init(struct mpv_global *global)
{
assert(!global->stats);
struct stats_base *stats = talloc_zero(global, struct stats_base);
ta_set_destructor(stats, stats_destroy);
pthread_mutex_init(&stats->lock, NULL);
global->stats = stats;
stats->global = global;
}
static void add_stat(struct mpv_node *list, struct stat_entry *e,
const char *suffix, double num_val, char *text)
{
struct mpv_node *ne = node_array_add(list, MPV_FORMAT_NODE_MAP);
node_map_add_string(ne, "name", suffix ?
mp_tprintf(80, "%s/%s", e->full_name, suffix) : e->full_name);
node_map_add_double(ne, "value", num_val);
if (text)
node_map_add_string(ne, "text", text);
}
static int cmp_entry(const void *p1, const void *p2)
{
struct stat_entry **e1 = (void *)p1;
struct stat_entry **e2 = (void *)p2;
return strcmp((*e1)->full_name, (*e2)->full_name);
}
void stats_global_query(struct mpv_global *global, struct mpv_node *out)
{
struct stats_base *stats = global->stats;
assert(stats);
pthread_mutex_lock(&stats->lock);
atomic_store(&stats->active, true);
if (!stats->num_entries) {
for (struct stats_ctx *ctx = stats->list.head; ctx; ctx = ctx->list.next)
{
for (int n = 0; n < ctx->num_entries; n++) {
MP_TARRAY_APPEND(stats, stats->entries, stats->num_entries,
ctx->entries[n]);
}
}
if (stats->num_entries) {
qsort(stats->entries, stats->num_entries, sizeof(stats->entries[0]),
cmp_entry);
}
}
node_init(out, MPV_FORMAT_NODE_ARRAY, NULL);
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int64_t now = mp_time_ns();
if (stats->last_time) {
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double t_ms = MP_TIME_NS_TO_MS(now - stats->last_time);
struct mpv_node *ne = node_array_add(out, MPV_FORMAT_NODE_MAP);
node_map_add_string(ne, "name", "poll-time");
node_map_add_double(ne, "value", t_ms);
node_map_add_string(ne, "text", mp_tprintf(80, "%.2f ms", t_ms));
// Very dirty way to reset everything if the stats.lua page was probably
// closed. Not enough energy left for clean solution. Fuck it.
if (t_ms > 2000) {
for (int n = 0; n < stats->num_entries; n++) {
struct stat_entry *e = stats->entries[n];
e->cpu_start_ns = 0;
e->val_rt = e->val_th = 0;
if (e->type != VAL_THREAD_CPU_TIME)
e->type = 0;
}
}
}
stats->last_time = now;
for (int n = 0; n < stats->num_entries; n++) {
struct stat_entry *e = stats->entries[n];
switch (e->type) {
case VAL_STATIC:
add_stat(out, e, NULL, e->val_d, NULL);
break;
case VAL_STATIC_SIZE: {
char *s = format_file_size(e->val_d);
add_stat(out, e, NULL, e->val_d, s);
talloc_free(s);
break;
}
case VAL_INC:
add_stat(out, e, NULL, e->val_d, NULL);
e->val_d = 0;
break;
case VAL_TIME: {
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double t_cpu = MP_TIME_NS_TO_MS(e->val_th);
add_stat(out, e, "cpu", t_cpu, mp_tprintf(80, "%.2f ms", t_cpu));
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double t_rt = MP_TIME_NS_TO_MS(e->val_rt);
add_stat(out, e, "time", t_rt, mp_tprintf(80, "%.2f ms", t_rt));
e->val_rt = e->val_th = 0;
break;
}
case VAL_THREAD_CPU_TIME: {
int64_t t = get_thread_cpu_time_ns(e->thread);
if (!e->cpu_start_ns)
e->cpu_start_ns = t;
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double t_msec = MP_TIME_NS_TO_MS(t - e->cpu_start_ns);
add_stat(out, e, NULL, t_msec, mp_tprintf(80, "%.2f ms", t_msec));
e->cpu_start_ns = t;
break;
}
default: ;
}
}
pthread_mutex_unlock(&stats->lock);
}
static void stats_ctx_destroy(void *p)
{
struct stats_ctx *ctx = p;
pthread_mutex_lock(&ctx->base->lock);
LL_REMOVE(list, &ctx->base->list, ctx);
ctx->base->num_entries = 0; // invalidate
pthread_mutex_unlock(&ctx->base->lock);
}
struct stats_ctx *stats_ctx_create(void *ta_parent, struct mpv_global *global,
const char *prefix)
{
struct stats_base *base = global->stats;
assert(base);
struct stats_ctx *ctx = talloc_zero(ta_parent, struct stats_ctx);
ctx->base = base;
ctx->prefix = talloc_strdup(ctx, prefix);
ta_set_destructor(ctx, stats_ctx_destroy);
pthread_mutex_lock(&base->lock);
LL_APPEND(list, &base->list, ctx);
base->num_entries = 0; // invalidate
pthread_mutex_unlock(&base->lock);
return ctx;
}
static struct stat_entry *find_entry(struct stats_ctx *ctx, const char *name)
{
for (int n = 0; n < ctx->num_entries; n++) {
if (strcmp(ctx->entries[n]->name, name) == 0)
return ctx->entries[n];
}
struct stat_entry *e = talloc_zero(ctx, struct stat_entry);
snprintf(e->name, sizeof(e->name), "%s", name);
assert(strcmp(e->name, name) == 0); // make e->name larger and don't complain
e->full_name = talloc_asprintf(e, "%s/%s", ctx->prefix, e->name);
MP_TARRAY_APPEND(ctx, ctx->entries, ctx->num_entries, e);
ctx->base->num_entries = 0; // invalidate
return e;
}
static void static_value(struct stats_ctx *ctx, const char *name, double val,
enum val_type type)
{
if (!IS_ACTIVE(ctx))
return;
pthread_mutex_lock(&ctx->base->lock);
struct stat_entry *e = find_entry(ctx, name);
e->val_d = val;
e->type = type;
pthread_mutex_unlock(&ctx->base->lock);
}
void stats_value(struct stats_ctx *ctx, const char *name, double val)
{
static_value(ctx, name, val, VAL_STATIC);
}
void stats_size_value(struct stats_ctx *ctx, const char *name, double val)
{
static_value(ctx, name, val, VAL_STATIC_SIZE);
}
void stats_time_start(struct stats_ctx *ctx, const char *name)
{
MP_STATS(ctx->base->global, "start %s", name);
if (!IS_ACTIVE(ctx))
return;
pthread_mutex_lock(&ctx->base->lock);
struct stat_entry *e = find_entry(ctx, name);
e->cpu_start_ns = get_thread_cpu_time_ns(pthread_self());
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e->time_start_ns = mp_time_ns();
pthread_mutex_unlock(&ctx->base->lock);
}
void stats_time_end(struct stats_ctx *ctx, const char *name)
{
MP_STATS(ctx->base->global, "end %s", name);
if (!IS_ACTIVE(ctx))
return;
pthread_mutex_lock(&ctx->base->lock);
struct stat_entry *e = find_entry(ctx, name);
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if (e->time_start_ns) {
e->type = VAL_TIME;
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e->val_rt += mp_time_ns() - e->time_start_ns;
e->val_th += get_thread_cpu_time_ns(pthread_self()) - e->cpu_start_ns;
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e->time_start_ns = 0;
}
pthread_mutex_unlock(&ctx->base->lock);
}
void stats_event(struct stats_ctx *ctx, const char *name)
{
if (!IS_ACTIVE(ctx))
return;
pthread_mutex_lock(&ctx->base->lock);
struct stat_entry *e = find_entry(ctx, name);
e->val_d += 1;
e->type = VAL_INC;
pthread_mutex_unlock(&ctx->base->lock);
}
static void register_thread(struct stats_ctx *ctx, const char *name,
enum val_type type)
{
pthread_mutex_lock(&ctx->base->lock);
struct stat_entry *e = find_entry(ctx, name);
e->type = type;
e->thread = pthread_self();
pthread_mutex_unlock(&ctx->base->lock);
}
void stats_register_thread_cputime(struct stats_ctx *ctx, const char *name)
{
register_thread(ctx, name, VAL_THREAD_CPU_TIME);
}
void stats_unregister_thread(struct stats_ctx *ctx, const char *name)
{
register_thread(ctx, name, 0);
}