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cfq: Optimization for close cooperating queue searching 

It doesn't make any sense to try to find out a close cooperating
queue if current cfqq is the only one in the group.

Signed-off-by: Gui Jianfeng <guijianfeng@cn.fujitsu.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Gui Jianfeng 2009-12-08 08:54:17 +01:00 committed by Jens Axboe
parent a3b8d92d25
commit b9d8f4c73b
1 changed files with 6 additions and 0 deletions
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6
block/cfq-iosched.c
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@ -1749,6 +1749,12 @@ static struct cfq_queue *cfq_close_cooperator(struct cfq_data *cfqd,
if (CFQQ_SEEKY(cur_cfqq))
return NULL;
/*
* Don't search priority tree if it's the only queue in the group.
*/
if (cur_cfqq->cfqg->nr_cfqq == 1)
return NULL;
/*
* We should notice if some of the queues are cooperating, eg
* working closely on the same area of the disk. In that case,