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Message-Id: <1437061068-26118-3-git-send-email-ming.lei@canonical.com> Date: Thu, 16 Jul 2015 23:37:44 +0800 From: Ming Lei <ming.lei@...onical.com> To: Jens Axboe <axboe@...nel.dk>, linux-kernel@...r.kernel.org Cc: "Justin M. Forbes" <jforbes@...oraproject.org>, Jeff Moyer <jmoyer@...hat.com>, Tejun Heo <tj@...nel.org>, Christoph Hellwig <hch@...radead.org>, Ming Lei <ming.lei@...onical.com> Subject: [PATCH v7 2/6] block: loop: set QUEUE_FLAG_NOMERGES for request queue of loop It doesn't make sense to enable merge because the I/O submitted to backing file is handled page by page. Signed-off-by: Ming Lei <ming.lei@...onical.com> --- drivers/block/loop.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/block/loop.c b/drivers/block/loop.c index f7a4c9d..e4381f8 100644 --- a/drivers/block/loop.c +++ b/drivers/block/loop.c @@ -1595,6 +1595,12 @@ static int loop_add(struct loop_device **l, int i) } lo->lo_queue->queuedata = lo; + /* + * It doesn't make sense to enable merge because the I/O + * submitted to backing file is handled page by page. + */ + queue_flag_set_unlocked(QUEUE_FLAG_NOMERGES, lo->lo_queue); + INIT_LIST_HEAD(&lo->write_cmd_head); INIT_WORK(&lo->write_work, loop_queue_write_work); -- 1.9.1 -- 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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