diff options
Diffstat (limited to 'usr/src/uts/common/conf')
| -rw-r--r-- | usr/src/uts/common/conf/param.c | 47 |
1 files changed, 41 insertions, 6 deletions
diff --git a/usr/src/uts/common/conf/param.c b/usr/src/uts/common/conf/param.c index ceecf32ee8..ac5d99a76f 100644 --- a/usr/src/uts/common/conf/param.c +++ b/usr/src/uts/common/conf/param.c @@ -67,6 +67,7 @@ #include <sys/vmem.h> #include <sys/clock.h> +#include <sys/clock_impl.h> #include <sys/serializer.h> /* @@ -149,15 +150,35 @@ const unsigned int _nbpg = (unsigned int)MMU_PAGESIZE; * of more than about 10 kHz seems utterly ridiculous, although * this observation will no doubt seem quaintly amusing one day. */ -int hz = 100; -int hires_hz = 1000; +#define HIRES_HZ_DEFAULT 1000 + +int hz = HZ_DEFAULT; +int hires_hz = HIRES_HZ_DEFAULT; + int hires_tick = 0; int cpu_decay_factor = 10; /* this is no longer tied to clock */ -int tick_per_msec; /* clock ticks per millisecond (zero if hz < 1000) */ -int msec_per_tick; /* millseconds per clock tick (zero if hz > 1000) */ -int usec_per_tick; /* microseconds per clock tick */ -int nsec_per_tick; /* nanoseconds per clock tick */ int max_hres_adj; /* maximum adjustment of hrtime per tick */ +int tick_per_msec; /* clock ticks per millisecond (zero if hz < 1000) */ + +/* + * Milliseconds, Microseconds, and Nanoseconds per clock tick + * + * Note: + * msec_per_tick is zero if hz > 1000 + */ +int msec_per_tick; +int usec_per_tick; +int nsec_per_tick; + +/* + * Time Resolution values. These are defined in condvar.h and initialized in + * param_init(). Consumers of cv_reltimedwait() and cv_reltimedwait_sig() + * need to specify how accurate the timeout argument should be through + * one of these values. The intention is to allow the underlying implementation + * to anticipate or defer the expiration of timeouts, preventing unnecessary + * wakeups by batch processing similarly expiring events. + */ +time_res_t time_res[TR_COUNT]; /* * Setting "snooping" to a non-zero value will cause a deadman panic if @@ -661,6 +682,20 @@ param_init(void) usec_per_tick = MICROSEC / hz; nsec_per_tick = NANOSEC / hz; max_hres_adj = nsec_per_tick >> ADJ_SHIFT; + + /* + * Consumers of relative timedwait functions must specify how accurately + * the given timeout must expire. This is currently TR_CLOCK_TICK for + * the vast majority of consumers, but nsec_per_tick becomes an + * artificial value in a tickless world. Each caller of such routines + * should re-evaluate their usage and specify the appropriate + * resolution. + */ + time_res[TR_NANOSEC] = SEC; + time_res[TR_MICROSEC] = MILLISEC; + time_res[TR_MILLISEC] = MICROSEC; + time_res[TR_SEC] = NANOSEC; + time_res[TR_CLOCK_TICK] = nsec_per_tick; } /* |