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Add cv_wait_io() to account I/O time

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Under Linux when a task is waiting on I/O it should call the
io_schedule() function for proper accounting.  The Solaris
cv_wait() function provides no way to specify what the cv
is waiting on therefore cv_wait_io() is introduced.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #206
This commit is contained in:
Matt Johnston 2012-12-21 10:29:16 +08:00 committed by Brian Behlendorf
parent 02d25048d2
commit 46a75aadb7
2 changed files with 16 additions and 4 deletions
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2
include/sys/condvar.h
View File

@ -51,6 +51,7 @@ typedef enum { CV_DEFAULT=0, CV_DRIVER } kcv_type_t;
extern void __cv_init(kcondvar_t *cvp, char *name, kcv_type_t type, void *arg);
extern void __cv_destroy(kcondvar_t *cvp);
extern void __cv_wait(kcondvar_t *cvp, kmutex_t *mp);
extern void __cv_wait_io(kcondvar_t *cvp, kmutex_t *mp);
extern void __cv_wait_interruptible(kcondvar_t *cvp, kmutex_t *mp);
extern clock_t __cv_timedwait(kcondvar_t *cvp, kmutex_t *mp, clock_t exp_time);
extern clock_t __cv_timedwait_interruptible(kcondvar_t *cvp, kmutex_t *mp,
@ -61,6 +62,7 @@ extern void __cv_broadcast(kcondvar_t *cvp);
#define cv_init(cvp, name, type, arg) __cv_init(cvp, name, type, arg)
#define cv_destroy(cvp) __cv_destroy(cvp)
#define cv_wait(cvp, mp) __cv_wait(cvp, mp)
#define cv_wait_io(cvp, mp) __cv_wait_io(cvp, mp)
#define cv_wait_interruptible(cvp, mp) __cv_wait_interruptible(cvp,mp)
#define cv_timedwait(cvp, mp, t) __cv_timedwait(cvp, mp, t)
#define cv_timedwait_interruptible(cvp, mp, t) \

18
module/spl/spl-condvar.c
View File

@ -97,7 +97,7 @@ __cv_destroy(kcondvar_t *cvp)
EXPORT_SYMBOL(__cv_destroy);
static void
cv_wait_common(kcondvar_t *cvp, kmutex_t *mp, int state)
cv_wait_common(kcondvar_t *cvp, kmutex_t *mp, int state, int io)
{
DEFINE_WAIT(wait);
SENTRY;
@ -121,7 +121,10 @@ cv_wait_common(kcondvar_t *cvp, kmutex_t *mp, int state)
* ensures we're linked in to the waiters list and avoids the
* race where 'cvp->cv_waiters > 0' but the list is empty. */
mutex_exit(mp);
schedule();
if (io)
io_schedule();
else
schedule();
mutex_enter(mp);
/* No more waiters a different mutex could be used */
@ -139,17 +142,24 @@ cv_wait_common(kcondvar_t *cvp, kmutex_t *mp, int state)
void
__cv_wait(kcondvar_t *cvp, kmutex_t *mp)
{
cv_wait_common(cvp, mp, TASK_UNINTERRUPTIBLE);
cv_wait_common(cvp, mp, TASK_UNINTERRUPTIBLE, 0);
}
EXPORT_SYMBOL(__cv_wait);
void
__cv_wait_interruptible(kcondvar_t *cvp, kmutex_t *mp)
{
cv_wait_common(cvp, mp, TASK_INTERRUPTIBLE);
cv_wait_common(cvp, mp, TASK_INTERRUPTIBLE, 0);
}
EXPORT_SYMBOL(__cv_wait_interruptible);
void
__cv_wait_io(kcondvar_t *cvp, kmutex_t *mp)
{
cv_wait_common(cvp, mp, TASK_UNINTERRUPTIBLE, 1);
}
EXPORT_SYMBOL(__cv_wait_io);
/* 'expire_time' argument is an absolute wall clock time in jiffies.
* Return value is time left (expire_time - now) or -1 if timeout occurred.
*/