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authorJens Axboe <jens.axboe@oracle.com>2008-11-19 16:38:39 +0300
committerJens Axboe <jens.axboe@oracle.com>2008-12-29 10:28:42 +0300
commit70ed28b92a786f44750ab64117b03d126dd14656 (patch)
tree03e84c48c262b380fbcccb21f55ff979aaeb4e77
parent65d3618ccfe686e8d7b3f01a838d0578182406df (diff)
downloadlinux-70ed28b92a786f44750ab64117b03d126dd14656.tar.xz
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>
-rw-r--r--block/blk-core.c1
-rw-r--r--block/blk-timeout.c4
2 files changed, 1 insertions, 4 deletions
diff --git a/block/blk-core.c b/block/blk-core.c
index 561e8a1b43a4..243d18b4ceb0 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);
diff --git a/block/blk-timeout.c b/block/blk-timeout.c
index 99c3efc706b7..a09535377a94 100644
--- a/block/blk-timeout.c
+++ b/block/blk-timeout.c
@@ -73,11 +73,7 @@ ssize_t part_timeout_store(struct device *dev, struct device_attribute *attr,
*/
void blk_delete_timer(struct request *req)
{
- struct request_queue *q = req->q;
-
list_del_init(&req->timeout_list);
- if (list_empty(&q->timeout_list))
- del_timer(&q->timeout);
}
static void blk_rq_timed_out(struct request *req)