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ngx_perf_counters.h
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ngx_perf_counters.h
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#ifndef _NGX_PERF_COUNTERS_H_INCLUDED_
#define _NGX_PERF_COUNTERS_H_INCLUDED_
// includes
#include <ngx_core.h>
// comment the line below to remove the support for performance counters
#define NGX_PERF_COUNTERS_ENABLED
// get tick count
#if (NGX_HAVE_CLOCK_GETTIME)
typedef struct timespec ngx_tick_count_t;
#define ngx_get_tick_count(tp) (void) clock_gettime(CLOCK_MONOTONIC, tp)
#define ngx_tick_count_diff(start, end) \
(((end).tv_sec - (start).tv_sec) * 1000000 + ((end).tv_nsec - (start).tv_nsec) / 1000)
#else
typedef struct timeval ngx_tick_count_t;
#define ngx_get_tick_count(tp) ngx_gettimeofday(tp)
#define ngx_tick_count_diff(start, end) \
(((end).tv_sec - (start).tv_sec) * 1000000 + ((end).tv_usec - (start).tv_usec))
#endif
#ifdef NGX_PERF_COUNTERS_ENABLED
// perf counters macros
#define ngx_perf_counter_get_state(shm_zone) \
(shm_zone != NULL ? ((ngx_slab_pool_t *)shm_zone->shm.addr)->data : NULL)
#define ngx_perf_counter_context(ctx) \
ngx_perf_counter_context_t ctx
#define ngx_perf_counter_start(ctx) \
ngx_get_tick_count(&ctx.start);
// Note: the calculation of 'max' has a race condition, the value can decrease since the condition
// and the assignment are not performed atomically. however, the value of max is expected to
// converge quickly so that its updates will be performed less and less frequently, so it
// should be accurate enough.
#define ngx_perf_counter_end(state, ctx, type) \
if (state != NULL) \
{ \
ngx_tick_count_t __end; \
ngx_atomic_t __delta; \
\
ngx_get_tick_count(&__end); \
\
__delta = ngx_tick_count_diff(ctx.start, __end); \
(void)ngx_atomic_fetch_add(&state->counters[type].sum, __delta); \
(void)ngx_atomic_fetch_add(&state->counters[type].count, 1); \
if (__delta > state->counters[type].max) \
{ \
struct timeval __tv; \
ngx_gettimeofday(&__tv); \
state->counters[type].max = __delta; \
state->counters[type].max_time = __tv.tv_sec; \
state->counters[type].max_pid = ngx_pid; \
} \
}
#define ngx_perf_counter_copy(target, source) target = source
// typedefs
enum {
#define PC(id, name) PC_##id,
#include "ngx_perf_counters_x.h"
#undef PC
PC_COUNT
};
typedef struct {
ngx_tick_count_t start;
} ngx_perf_counter_context_t;
#else
// empty macros
#define ngx_perf_counter_get_state(shm_zone) (NULL)
#define ngx_perf_counter_context(ctx)
#define ngx_perf_counter_start(ctx)
#define ngx_perf_counter_end(state, ctx, type)
#define ngx_perf_counter_copy(target, source)
#define PC_COUNT (0)
#endif
// typedefs
typedef struct {
ngx_atomic_t sum;
ngx_atomic_t count;
ngx_atomic_t max;
ngx_atomic_t max_time;
ngx_atomic_t max_pid;
} ngx_perf_counter_t;
typedef struct {
ngx_perf_counter_t counters[PC_COUNT];
} ngx_perf_counters_t;
// globals
extern const ngx_str_t perf_counters_open_tags[];
extern const ngx_str_t perf_counters_close_tags[];
// functions
ngx_shm_zone_t* ngx_perf_counters_create_zone(ngx_conf_t *cf, ngx_str_t *name, void *tag);
#endif // _NGX_PERF_COUNTERS_H_INCLUDED_