Messages in this thread Patch in this message | | | From | Corrado Zoccolo <> | Subject | [PATCH] cfq-iosched: avoid slice overrun when idling | Date | Wed, 7 Oct 2009 10:59:00 +0200 |
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Idle window for a queue is reduced when the queue is about to finish its slice.
Signed-off-by: Corrado Zoccolo <czoccolo@gmail.com> --- block/cfq-iosched.c | 4 +++- 1 files changed, 3 insertions(+), 1 deletions(-)
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c index 4ab33d8..55bb8ca 100644 --- a/block/cfq-iosched.c +++ b/block/cfq-iosched.c @@ -1105,8 +1105,10 @@ static void cfq_arm_slice_timer(struct cfq_data *cfqd) * we don't want to idle for seeks, but we do want to allow * fair distribution of slice time for a process doing back-to-back * seeks. so allow a little bit of time for him to submit a new rq + * but avoid overrunning its timeslice */ - sl = cfqd->cfq_slice_idle; + sl = min_t(unsigned long, cfqd->cfq_slice_idle, + cfqq->slice_end - jiffies); if (sample_valid(cic->seek_samples) && CIC_SEEKY(cic)) sl = min(sl, msecs_to_jiffies(CFQ_MIN_TT)); -- 1.6.2.5
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