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| author |   David Woodhouse <dwmw2@infradead.org> | 2006-05-16 01:19:52 +0100 |
|---|---|---|
| committer | David Woodhouse <dwmw2@infradead.org> | 2006-05-16 01:19:52 +0100 |
| commit | 18594822fcb01d4b35e05b9018f770a0b4156d1a (patch) | |
| tree | 38d35c38086a564beaac215f8e52694cdbfab1c3 /block/elevator.c | |
| parent | [PATCH] jffs2: memory leak in jffs2_scan_medium() (diff) | |
| parent | [PATCH] dl2k needs dma-mapping.h (diff) | |
| download | linux-dev-18594822fcb01d4b35e05b9018f770a0b4156d1a.tar.xz linux-dev-18594822fcb01d4b35e05b9018f770a0b4156d1a.zip | |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Diffstat (limited to 'block/elevator.c')
| -rw-r--r-- | block/elevator.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/block/elevator.c b/block/elevator.c index 29825792cbd5..8768a367fdde 100644 --- a/block/elevator.c +++ b/block/elevator.c @@ -333,6 +333,7 @@ void elv_insert(request_queue_t *q, struct request *rq, int where) { struct list_head *pos; unsigned ordseq; + int unplug_it = 1; blk_add_trace_rq(q, rq, BLK_TA_INSERT); @@ -399,6 +400,11 @@ void elv_insert(request_queue_t *q, struct request *rq, int where) } list_add_tail(&rq->queuelist, pos); + /* + * most requeues happen because of a busy condition, don't + * force unplug of the queue for that case. + */ + unplug_it = 0; break; default: @@ -407,7 +413,7 @@ void elv_insert(request_queue_t *q, struct request *rq, int where) BUG(); } - if (blk_queue_plugged(q)) { + if (unplug_it && blk_queue_plugged(q)) { int nrq = q->rq.count[READ] + q->rq.count[WRITE] - q->in_flight; |