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Add POSIX clock id CLOCK_THREAD_CPUTIME_ID, this can be used to measure

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per-thread runtime in user code.
This commit is contained in:
David Xu 2008-01-18 07:04:42 +00:00
parent 91c3a77c57
commit 00d6ac63cd
2 changed files with 17 additions and 0 deletions
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16
sys/kern/kern_time.c
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@ -201,6 +201,7 @@ kern_clock_gettime(struct thread *td, clockid_t clock_id, struct timespec *ats)
{
struct timeval sys, user;
struct proc *p;
uint64_t runtime, curtime, switchtime;
p = td->td_proc;
switch (clock_id) {
@ -242,6 +243,15 @@ kern_clock_gettime(struct thread *td, clockid_t clock_id, struct timespec *ats)
ats->tv_sec = time_second;
ats->tv_nsec = 0;
break;
case CLOCK_THREAD_CPUTIME_ID:
critical_enter();
switchtime = PCPU_GET(switchtime);
curtime = cpu_ticks();
critical_exit();
runtime = cputick2usec(td->td_runtime + curtime - switchtime);
ats->tv_sec = runtime / 1000000;
ats->tv_nsec = runtime % 1000000 * 1000;
break;
default:
return (EINVAL);
}
@ -336,6 +346,12 @@ kern_clock_getres(struct thread *td, clockid_t clock_id, struct timespec *ts)
ts->tv_sec = 1;
ts->tv_nsec = 0;
break;
case CLOCK_THREAD_CPUTIME_ID:
/* sync with cputick2usec */
ts->tv_nsec = 1000000 / cpu_tickrate();
if (ts->tv_nsec == 0)
ts->tv_nsec = 1000;
break;
default:
return (EINVAL);
}

1
sys/sys/time.h
View File

@ -246,6 +246,7 @@ struct clockinfo {
#define CLOCK_MONOTONIC_PRECISE 11 /* FreeBSD-specific. */
#define CLOCK_MONOTONIC_FAST 12 /* FreeBSD-specific. */
#define CLOCK_SECOND 13 /* FreeBSD-specific. */
#define CLOCK_THREAD_CPUTIME_ID 14
#endif
#ifndef TIMER_ABSTIME