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cfq: set workload as expired if it doesn't have any slice left 

When a group is resumed, if it doesn't have workload slice left,
we should set workload_expires as expired. Otherwise, we might
start from where we left in previous group by error.
Thanks the idea from Corrado.

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 2009-12-15 10:08:45 +01:00 committed by Jens Axboe
parent 82bbbf28db
commit 66ae291978
1 changed files with 3 additions and 1 deletions
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4
block/cfq-iosched.c
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@ -2113,7 +2113,9 @@ static void cfq_choose_cfqg(struct cfq_data *cfqd)
cfqd->workload_expires = jiffies + cfqg->saved_workload_slice;
cfqd->serving_type = cfqg->saved_workload;
cfqd->serving_prio = cfqg->saved_serving_prio;
}
} else
cfqd->workload_expires = jiffies - 1;
choose_service_tree(cfqd, cfqg);
}