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| author | Tejun Heo <htejun@gmail.com> | 2005-11-10 18:20:16 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@nelson.home.kernel.dk> | 2005-11-12 10:56:36 +0100 |
| commit | b740d98f5614e34b4cff2e1e67826f007c8d4f30 (patch) | |
| tree | 50ff24c84b2ecfc2e8e518b1d9aecf3be2bc8ec5 /block/cfq-iosched.c | |
| parent | be56123568072d223263a6a70a087d1e7faabb83 (diff) | |
| download | lwn-b740d98f5614e34b4cff2e1e67826f007c8d4f30.tar.gz lwn-b740d98f5614e34b4cff2e1e67826f007c8d4f30.zip | |
[BLOCK] cfq-iosched: fix slice_left calculation
When cfq slice expires, remainder of slice is calculated and stored in
cfqq->slice_left. Current code calculates the opposite of remainder -
how many jiffies the cfqq has used past slice end. This patch fixes
the bug.
Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jens Axboe <axboe@suse.de>
Diffstat (limited to 'block/cfq-iosched.c')
| -rw-r--r-- | block/cfq-iosched.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c index 452538644bce..2b64f5852bfd 100644 --- a/block/cfq-iosched.c +++ b/block/cfq-iosched.c @@ -861,8 +861,8 @@ __cfq_slice_expired(struct cfq_data *cfqd, struct cfq_queue *cfqq, * store what was left of this slice, if the queue idled out * or was preempted */ - if (time_after(now, cfqq->slice_end)) - cfqq->slice_left = now - cfqq->slice_end; + if (time_after(cfqq->slice_end, now)) + cfqq->slice_left = cfqq->slice_end - now; else cfqq->slice_left = 0; |