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Add cv_timedwait_sig_hires to allow interruptible sleep

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Signed-off-by: Chunwei Chen <david.chen@osnexus.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #548
This commit is contained in:
Chunwei Chen 2016-05-11 16:51:29 -07:00 committed by Brian Behlendorf
parent 5e39e4f0b2
commit 39cd90ef08
2 changed files with 32 additions and 10 deletions
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2
include/sys/condvar.h
View File

@ -59,6 +59,8 @@ extern clock_t __cv_timedwait(kcondvar_t *, kmutex_t *, clock_t);
extern clock_t __cv_timedwait_sig(kcondvar_t *, kmutex_t *, clock_t);
extern clock_t cv_timedwait_hires(kcondvar_t *, kmutex_t *, hrtime_t,
hrtime_t res, int flag);
extern clock_t cv_timedwait_sig_hires(kcondvar_t *, kmutex_t *, hrtime_t,
hrtime_t res, int flag);
extern void __cv_signal(kcondvar_t *);
extern void __cv_broadcast(kcondvar_t *c);

40
module/spl/spl-condvar.c
View File

@ -26,6 +26,7 @@
#include <sys/condvar.h>
#include <sys/time.h>
#include <linux/hrtimer.h>
void
__cv_init(kcondvar_t *cvp, char *name, kcv_type_t type, void *arg)
@ -238,7 +239,7 @@ __cv_timedwait_hires(kcondvar_t *cvp, kmutex_t *mp, hrtime_t expire_time,
DEFINE_WAIT(wait);
kmutex_t *m;
hrtime_t time_left, now;
unsigned long time_left_us;
ktime_t ktime_left;
ASSERT(cvp);
ASSERT(mp);
@ -258,7 +259,6 @@ __cv_timedwait_hires(kcondvar_t *cvp, kmutex_t *mp, hrtime_t expire_time,
atomic_dec(&cvp->cv_refs);
return (-1);
}
time_left_us = time_left / NSEC_PER_USEC;
prepare_to_wait_exclusive(&cvp->cv_event, &wait, state);
atomic_inc(&cvp->cv_waiters);
@ -273,7 +273,9 @@ __cv_timedwait_hires(kcondvar_t *cvp, kmutex_t *mp, hrtime_t expire_time,
* Allow a 100 us range to give kernel an opportunity to coalesce
* interrupts
*/
usleep_range(time_left_us, time_left_us + 100);
ktime_left = ktime_set(0, time_left);
schedule_hrtimeout_range(&ktime_left, 100 * NSEC_PER_USEC,
HRTIMER_MODE_REL);
/* No more waiters a different mutex could be used */
if (atomic_dec_and_test(&cvp->cv_waiters)) {
@ -290,15 +292,15 @@ __cv_timedwait_hires(kcondvar_t *cvp, kmutex_t *mp, hrtime_t expire_time,
mutex_enter(mp);
time_left = expire_time - gethrtime();
return (time_left > 0 ? time_left : -1);
return (time_left > 0 ? NSEC_TO_TICK(time_left) : -1);
}
/*
* Compatibility wrapper for the cv_timedwait_hires() Illumos interface.
*/
clock_t
cv_timedwait_hires(kcondvar_t *cvp, kmutex_t *mp, hrtime_t tim, hrtime_t res,
int flag)
static clock_t
cv_timedwait_hires_common(kcondvar_t *cvp, kmutex_t *mp, hrtime_t tim, hrtime_t res,
int flag, int state)
{
if (res > 1) {
/*
@ -309,13 +311,31 @@ cv_timedwait_hires(kcondvar_t *cvp, kmutex_t *mp, hrtime_t tim, hrtime_t res,
tim = (tim / res) * res;
}
if (!(flag & CALLOUT_FLAG_ABSOLUTE))
tim += gethrtime();
ASSERT(!(flag & CALLOUT_FLAG_ABSOLUTE));
/* get abs expire time */
tim += gethrtime();
return (__cv_timedwait_hires(cvp, mp, tim, TASK_UNINTERRUPTIBLE));
return (__cv_timedwait_hires(cvp, mp, tim, state));
}
clock_t
cv_timedwait_hires(kcondvar_t *cvp, kmutex_t *mp, hrtime_t tim, hrtime_t res,
int flag)
{
return (cv_timedwait_hires_common(cvp, mp, tim, res, flag,
TASK_UNINTERRUPTIBLE));
}
EXPORT_SYMBOL(cv_timedwait_hires);
clock_t
cv_timedwait_sig_hires(kcondvar_t *cvp, kmutex_t *mp, hrtime_t tim, hrtime_t res,
int flag)
{
return (cv_timedwait_hires_common(cvp, mp, tim, res, flag,
TASK_INTERRUPTIBLE));
}
EXPORT_SYMBOL(cv_timedwait_sig_hires);
void
__cv_signal(kcondvar_t *cvp)
{