diff options
Diffstat (limited to 'libnetdata/clocks/clocks.h')
| -rw-r--r-- | libnetdata/clocks/clocks.h | 30 |
1 files changed, 29 insertions, 1 deletions
diff --git a/libnetdata/clocks/clocks.h b/libnetdata/clocks/clocks.h index 4af451d60..cfe99f5e7 100644 --- a/libnetdata/clocks/clocks.h +++ b/libnetdata/clocks/clocks.h @@ -36,6 +36,12 @@ typedef struct heartbeat { #define CLOCK_MONOTONIC CLOCK_REALTIME #endif +/* Prefer CLOCK_MONOTONIC_COARSE where available to reduce overhead. It has the same semantics as CLOCK_MONOTONIC */ +#ifndef CLOCK_MONOTONIC_COARSE +/* fallback to CLOCK_MONOTONIC if not available */ +#define CLOCK_MONOTONIC_COARSE CLOCK_MONOTONIC +#endif + #ifndef CLOCK_BOOTTIME #ifdef CLOCK_UPTIME @@ -43,7 +49,7 @@ typedef struct heartbeat { #define CLOCK_BOOTTIME CLOCK_UPTIME #else // CLOCK_UPTIME /* CLOCK_BOOTTIME falls back to CLOCK_MONOTONIC */ -#define CLOCK_BOOTTIME CLOCK_MONOTONIC +#define CLOCK_BOOTTIME CLOCK_MONOTONIC_COARSE #endif // CLOCK_UPTIME #else // CLOCK_BOOTTIME @@ -54,13 +60,23 @@ typedef struct heartbeat { #endif // CLOCK_BOOTTIME +#ifndef NSEC_PER_MSEC #define NSEC_PER_MSEC 1000000ULL +#endif +#ifndef NSEC_PER_SEC #define NSEC_PER_SEC 1000000000ULL +#endif +#ifndef NSEC_PER_USEC #define NSEC_PER_USEC 1000ULL +#endif +#ifndef USEC_PER_SEC #define USEC_PER_SEC 1000000ULL +#endif +#ifndef MSEC_PER_SEC #define MSEC_PER_SEC 1000ULL +#endif #define USEC_PER_MS 1000ULL @@ -98,6 +114,9 @@ extern int clock_gettime(clockid_t clk_id, struct timespec *ts); * * All now_*_sec() functions return the time in seconds from the approriate clock, or 0 on error. * All now_*_usec() functions return the time in microseconds from the approriate clock, or 0 on error. + * + * Most functions will attempt to use CLOCK_MONOTONIC_COARSE if available to reduce contention overhead and improve + * performance scaling. If high precision is required please use one of the available now_*_high_precision_* functions. */ extern int now_realtime_timeval(struct timeval *tv); extern time_t now_realtime_sec(void); @@ -106,6 +125,9 @@ extern usec_t now_realtime_usec(void); extern int now_monotonic_timeval(struct timeval *tv); extern time_t now_monotonic_sec(void); extern usec_t now_monotonic_usec(void); +extern int now_monotonic_high_precision_timeval(struct timeval *tv); +extern time_t now_monotonic_high_precision_sec(void); +extern usec_t now_monotonic_high_precision_usec(void); extern int now_boottime_timeval(struct timeval *tv); extern time_t now_boottime_sec(void); @@ -136,6 +158,12 @@ extern int sleep_usec(usec_t usec); */ void test_clock_boottime(void); +/* + * When running a binary with CLOCK_MONOTONIC_COARSE defined on a system with a linux kernel older than Linux 2.6.32 the + * clock_gettime(2) system call fails with EINVAL. In that case it must fall-back to CLOCK_MONOTONIC. + */ +void test_clock_monotonic_coarse(void); + extern collected_number uptime_msec(char *filename); #endif /* NETDATA_CLOCKS_H */ |