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block,cfq: change code order 

cfq_slice_expired will change saved_workload_slice. It should be called
first so saved_workload_slice is correctly set to 0 after workload type
is changed.
This fixes the code order changed by 54b466e44b.

Tested-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Shaohua Li 2012-01-19 09:20:09 +01:00 committed by Jens Axboe
parent 90a4c0f51e
commit df0793abb9
1 changed files with 4 additions and 3 deletions
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7
block/cfq-iosched.c
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@ -3117,17 +3117,18 @@ cfq_should_preempt(struct cfq_data *cfqd, struct cfq_queue *new_cfqq,
*/
static void cfq_preempt_queue(struct cfq_data *cfqd, struct cfq_queue *cfqq)
{
enum wl_type_t old_type = cfqq_type(cfqd->active_queue);
cfq_log_cfqq(cfqd, cfqq, "preempt");
cfq_slice_expired(cfqd, 1);
/*
* workload type is changed, don't save slice, otherwise preempt
* doesn't happen
*/
if (cfqq_type(cfqd->active_queue) != cfqq_type(cfqq))
if (old_type != cfqq_type(cfqq))
cfqq->cfqg->saved_workload_slice = 0;
cfq_slice_expired(cfqd, 1);
/*
* Put the new queue at the front of the of the current list,
* so we know that it will be selected next.