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Date: Wed, 7 Oct 2009 23:15:41 +0200 From: Corrado Zoccolo <czoccolo@...il.com> To: Jens Axboe <jens.axboe@...cle.com> Cc: "Linux-Kernel" <linux-kernel@...r.kernel.org>, Jeff Moyer <jmoyer@...hat.com> Subject: [PATCH v2] cfq-iosched: avoid probable slice overrun when idling Idle timer is not armed if remaining slice is less than average think time. Signed-off-by: Corrado Zoccolo <czoccolo@...il.com> --- block/cfq-iosched.c | 8 ++++++++ 1 files changed, 8 insertions(+), 0 deletions(-) diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c index b35cc56..af1d621 100644 --- a/block/cfq-iosched.c +++ b/block/cfq-iosched.c @@ -1099,6 +1099,14 @@ static void cfq_arm_slice_timer(struct cfq_data *cfqd) if (!cic || !atomic_read(&cic->ioc->nr_tasks)) return; + /* + * think time is greater than remaining time slice + * don't idle, to avoid overrunnig the time slice + */ + if (sample_valid(cic->ttime_samples) && + (cfqq->slice_end - jiffies < cic->ttime_mean)) + return; + cfq_mark_cfqq_wait_request(cfqq); /* -- 1.6.2.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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