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Date: Tue, 3 Nov 2009 18:43:53 -0500 From: Vivek Goyal <vgoyal@...hat.com> To: linux-kernel@...r.kernel.org, jens.axboe@...cle.com Cc: nauman@...gle.com, dpshah@...gle.com, lizf@...fujitsu.com, ryov@...inux.co.jp, fernando@....ntt.co.jp, s-uchida@...jp.nec.com, taka@...inux.co.jp, guijianfeng@...fujitsu.com, jmoyer@...hat.com, balbir@...ux.vnet.ibm.com, righi.andrea@...il.com, m-ikeda@...jp.nec.com, vgoyal@...hat.com, akpm@...ux-foundation.org, riel@...hat.com, kamezawa.hiroyu@...fujitsu.com Subject: [PATCH 16/20] blkio: do not select co-operating queues from different cfq groups o Select co-operating queue from same group not from a different cfq_group to maintain the notion of fairness and isolation between groups. Signed-off-by: Vivek Goyal <vgoyal@...hat.com> --- block/cfq-iosched.c | 4 ++++ 1 files changed, 4 insertions(+), 0 deletions(-) diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c index 98dbead..020d6dd 100644 --- a/block/cfq-iosched.c +++ b/block/cfq-iosched.c @@ -1635,6 +1635,10 @@ static struct cfq_queue *cfq_close_cooperator(struct cfq_data *cfqd, if (!cfqq) return NULL; + /* If new queue belongs to different cfq_group, don't choose it */ + if (cfqq_to_cfqg(cur_cfqq) != cfqq_to_cfqg(cfqq)) + return NULL; + if (cfq_cfqq_coop(cfqq)) return NULL; -- 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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