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Message-Id: <1257291837-6246-15-git-send-email-vgoyal@redhat.com> Date: Tue, 3 Nov 2009 18:43:51 -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 14/20] blkio: Do not allow request merging across cfq groups o Do not allow request merging across cfq groups. Signed-off-by: Vivek Goyal <vgoyal@...hat.com> --- block/cfq-iosched.c | 3 +++ 1 files changed, 3 insertions(+), 0 deletions(-) diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c index 6936519..87b1799 100644 --- a/block/cfq-iosched.c +++ b/block/cfq-iosched.c @@ -1381,6 +1381,9 @@ static int cfq_allow_merge(struct request_queue *q, struct request *rq, struct cfq_io_context *cic; struct cfq_queue *cfqq; + /* Deny merge if bio and rq don't belong to same cfq group */ + if (cfqq_to_cfqg(RQ_CFQQ(rq)) != cfq_get_cfqg(cfqd, 0)) + return false; /* * Disallow merge of a sync bio into an async request. */ -- 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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