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authorJens Axboe <jens.axboe@oracle.com>2008-11-19 14:38:39 +0100
committerJens Axboe <jens.axboe@oracle.com>2008-12-29 08:28:42 +0100
commit70ed28b92a786f44750ab64117b03d126dd14656 (patch)
tree03e84c48c262b380fbcccb21f55ff979aaeb4e77 /block/blk-core.c
parent65d3618ccfe686e8d7b3f01a838d0578182406df (diff)
downloadop-kernel-dev-70ed28b92a786f44750ab64117b03d126dd14656.zip
op-kernel-dev-70ed28b92a786f44750ab64117b03d126dd14656.tar.gz
block: leave the request timeout timer running even on an empty list
For sync IO, we'll often do them serialized. This means we'll be touching the queue timer for every IO, as opposed to only occasionally like we do for queued IO. Instead of deleting the timer when the last request is removed, just let continue running. If a new request comes up soon we then don't have to readd the timer again. If no new requests arrive, the timer will expire without side effect later. This improves high iops sync IO by ~1%. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'block/blk-core.c')
-rw-r--r--block/blk-core.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/block/blk-core.c b/block/blk-core.c
index 561e8a1..243d18b 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -404,6 +404,7 @@ EXPORT_SYMBOL(blk_stop_queue);
void blk_sync_queue(struct request_queue *q)
{
del_timer_sync(&q->unplug_timer);
+ del_timer_sync(&q->timeout);
kblockd_flush_work(&q->unplug_work);
}
EXPORT_SYMBOL(blk_sync_queue);
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