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MFC r280757: Remove request sorting from GEOM_MIRROR and GEOM_RAID.

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When CPU is not busy, those queues are typically empty.  When CPU is busy,
then one more extra sorting is the last thing it needs.  If specific device
(HDD) really needs sorting, then it will be done later by CAM.

This supposed to fix livelock reported for mirror of two SSDs, when UFS
fires zillion of BIO_DELETE requests, that totally blocks I/O subsystem by
pointless sorting of requests and responses under single mutex lock.
This commit is contained in:
mav 2015-04-10 00:43:24 +00:00
parent 0fbe5b3df8
commit 036979b3f8
2 changed files with 7 additions and 7 deletions
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8
sys/geom/mirror/g_mirror.c
View File

@ -894,7 +894,7 @@ g_mirror_done(struct bio *bp)
sc = bp->bio_from->geom->softc;
bp->bio_cflags = G_MIRROR_BIO_FLAG_REGULAR;
mtx_lock(&sc->sc_queue_mtx);
bioq_disksort(&sc->sc_queue, bp);
bioq_insert_tail(&sc->sc_queue, bp);
mtx_unlock(&sc->sc_queue_mtx);
wakeup(sc);
}
@ -981,7 +981,7 @@ g_mirror_regular_request(struct bio *bp)
else {
pbp->bio_error = 0;
mtx_lock(&sc->sc_queue_mtx);
bioq_disksort(&sc->sc_queue, pbp);
bioq_insert_tail(&sc->sc_queue, pbp);
mtx_unlock(&sc->sc_queue_mtx);
G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc);
wakeup(sc);
@ -1021,7 +1021,7 @@ g_mirror_sync_done(struct bio *bp)
sc = bp->bio_from->geom->softc;
bp->bio_cflags = G_MIRROR_BIO_FLAG_SYNC;
mtx_lock(&sc->sc_queue_mtx);
bioq_disksort(&sc->sc_queue, bp);
bioq_insert_tail(&sc->sc_queue, bp);
mtx_unlock(&sc->sc_queue_mtx);
wakeup(sc);
}
@ -1150,7 +1150,7 @@ g_mirror_start(struct bio *bp)
return;
}
mtx_lock(&sc->sc_queue_mtx);
bioq_disksort(&sc->sc_queue, bp);
bioq_insert_tail(&sc->sc_queue, bp);
mtx_unlock(&sc->sc_queue_mtx);
G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc);
wakeup(sc);

6
sys/geom/raid/g_raid.c
View File

@ -1143,7 +1143,7 @@ g_raid_start(struct bio *bp)
return;
}
mtx_lock(&sc->sc_queue_mtx);
bioq_disksort(&sc->sc_queue, bp);
bioq_insert_tail(&sc->sc_queue, bp);
mtx_unlock(&sc->sc_queue_mtx);
if (!dumping) {
G_RAID_DEBUG1(4, sc, "Waking up %p.", sc);
@ -1355,7 +1355,7 @@ g_raid_unlock_range(struct g_raid_volume *vol, off_t off, off_t len)
(intmax_t)(lp->l_offset+lp->l_length));
mtx_lock(&sc->sc_queue_mtx);
while ((bp = bioq_takefirst(&vol->v_locked)) != NULL)
bioq_disksort(&sc->sc_queue, bp);
bioq_insert_tail(&sc->sc_queue, bp);
mtx_unlock(&sc->sc_queue_mtx);
free(lp, M_RAID);
return (0);
@ -1449,7 +1449,7 @@ g_raid_disk_done(struct bio *bp)
sd = bp->bio_caller1;
sc = sd->sd_softc;
mtx_lock(&sc->sc_queue_mtx);
bioq_disksort(&sc->sc_queue, bp);
bioq_insert_tail(&sc->sc_queue, bp);
mtx_unlock(&sc->sc_queue_mtx);
if (!dumping)
wakeup(sc);