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From: majianpeng <majianpeng@gmail.com>
To: Neil Brown <neilb@suse.de>
Cc: linux-raid <linux-raid@vger.kernel.org>, viro <viro@ZenIV.linux.org.uk>
Subject: [PATCH 2/2 V1] raid5: For odirect-write performance, not set  STRIPE_PREREAD_ACTIVE.
Date: Mon, 16 Jul 2012 16:33:02 +0800	[thread overview]
Message-ID: <2012071616325740688511@gmail.com> (raw)

Using flag REQ_NOIDLE to difference odirect-write and sync_write.

Signed-off-by: Jianpeng Ma <majianpeng@gmail.com>
---
 drivers/md/raid5.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 04348d7..29edaf0 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -4113,7 +4113,10 @@ static void make_request(struct mddev *mddev, struct bio * bi)
 			finish_wait(&conf->wait_for_overlap, &w);
 			set_bit(STRIPE_HANDLE, &sh->state);
 			clear_bit(STRIPE_DELAYED, &sh->state);
-			if ((bi->bi_rw & REQ_SYNC) &&
+			/* Difference odirect-write between regular file
+			 * and block-device
+			 */
+			if ((bi->bi_rw & REQ_NOIDLE) &&
 			    !test_and_set_bit(STRIPE_PREREAD_ACTIVE, &sh->state))
 				atomic_inc(&conf->preread_active_stripes);
 			mddev_check_plugged(mddev);
-- 
1.7.5.4

             reply	other threads:[~2012-07-16  8:33 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-07-16  8:33 majianpeng [this message]
2012-07-17  2:02 ` [PATCH 2/2 V1] raid5: For odirect-write performance, not set STRIPE_PREREAD_ACTIVE NeilBrown

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