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Message-ID: <20100107025413.27610.48801.stgit@austin.mtv.corp.google.com> Date: Wed, 06 Jan 2010 18:58:20 -0800 From: Divyesh Shah <dpshah@...gle.com> To: jens.axboe@...cle.com, czoccolo@...il.com, linux-kernel@...r.kernel.org Cc: nauman@...gle.com, mikew@...gle.com, ctalbott@...gle.com Subject: [PATCH] cfq-iosched: Respect ioprio_class when preempting In cfq_should_preempt(), we currently allow some cases where a non-RT request can preempt an ongoing RT cfqq timeslice. This should not happen. Examples include: o A sync_noidle wl type non-RT request pre-empting a sync_noidle wl type cfqq on which we are idling. o Once we have per-cgroup async queues, a non-RT sync request pre-empting a RT async cfqq. Signed-off-by: Divyesh Shah<dpshah@...gle.com> --- block/cfq-iosched.c | 6 ++++++ 1 files changed, 6 insertions(+), 0 deletions(-) diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c index 7d6cef9..e9e6610 100644 --- a/block/cfq-iosched.c +++ b/block/cfq-iosched.c @@ -3104,6 +3104,12 @@ cfq_should_preempt(struct cfq_data *cfqd, struct cfq_queue *new_cfqq, return true; /* + * Don't allow a non-RT request to preempt an ongoing RT cfqq timeslice. + */ + if (cfq_class_rt(cfqq) && !cfq_class_rt(new_cfqq)) + return false; + + /* * if the new request is sync, but the currently running queue is * not, let the sync request have priority. */ -- 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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