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Call wakeup() only for the first request on the queue.

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This commit is contained in:
Alexander Motin 2009-12-30 17:23:27 +00:00
parent fe0533fd12
commit 0d883b11e3
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=201264
1 changed files with 8 additions and 2 deletions
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10
sys/geom/geom_io.c
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@ -391,6 +391,7 @@ void
g_io_request(struct bio *bp, struct g_consumer *cp)
{
struct g_provider *pp;
int first;
KASSERT(cp != NULL, ("NULL cp in g_io_request"));
KASSERT(bp != NULL, ("NULL bp in g_io_request"));
@ -463,12 +464,14 @@ g_io_request(struct bio *bp, struct g_consumer *cp)
pp->nstart++;
cp->nstart++;
first = TAILQ_EMPTY(&g_bio_run_down.bio_queue);
TAILQ_INSERT_TAIL(&g_bio_run_down.bio_queue, bp, bio_queue);
g_bio_run_down.bio_queue_length++;
g_bioq_unlock(&g_bio_run_down);
/* Pass it on down. */
wakeup(&g_wait_down);
if (first)
wakeup(&g_wait_down);
}
void
@ -476,6 +479,7 @@ g_io_deliver(struct bio *bp, int error)
{
struct g_consumer *cp;
struct g_provider *pp;
int first;
KASSERT(bp != NULL, ("NULL bp in g_io_deliver"));
pp = bp->bio_to;
@ -536,11 +540,13 @@ g_io_deliver(struct bio *bp, int error)
pp->nend++;
if (error != ENOMEM) {
bp->bio_error = error;
first = TAILQ_EMPTY(&g_bio_run_up.bio_queue);
TAILQ_INSERT_TAIL(&g_bio_run_up.bio_queue, bp, bio_queue);
bp->bio_flags |= BIO_ONQUEUE;
g_bio_run_up.bio_queue_length++;
g_bioq_unlock(&g_bio_run_up);
wakeup(&g_wait_up);
if (first)
wakeup(&g_wait_up);
return;
}
g_bioq_unlock(&g_bio_run_up);