linux-kernel - [PATCH] blk-throttle: Fix calculation of max number of WRITES to be dispatched

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Message-ID: <20101027172941.GD12981@redhat.com>
Date:	Wed, 27 Oct 2010 13:29:41 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Jens Axboe <jaxboe@...ionio.com>,
	linux kernel mailing list <linux-kernel@...r.kernel.org>
Cc:	yummylln@...oo.com.cn
Subject: [PATCH] blk-throttle: Fix calculation of max number of WRITES to be
 dispatched

o Currently we try to dispatch more READS and less WRITES (75%, 25%) in one
  dispatch round. ummy pointed out that there is a bug in max_nr_writes
  calculation. This patch fixes it.

Reported-by: ummy y <yummylln@...oo.com.cn>
Signed-off-by: Vivek Goyal <vgoyal@...hat.com>
---
 block/blk-throttle.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-2.6/block/blk-throttle.c
===================================================================
--- linux-2.6.orig/block/blk-throttle.c	2010-10-27 10:57:25.000000000 -0400
+++ linux-2.6/block/blk-throttle.c	2010-10-27 11:02:33.733048194 -0400
@@ -645,7 +645,7 @@ static int throtl_dispatch_tg(struct thr
 {
 	unsigned int nr_reads = 0, nr_writes = 0;
 	unsigned int max_nr_reads = throtl_grp_quantum*3/4;
-	unsigned int max_nr_writes = throtl_grp_quantum - nr_reads;
+	unsigned int max_nr_writes = throtl_grp_quantum - max_nr_reads;
 	struct bio *bio;
 
 	/* Try to dispatch 75% READS and 25% WRITES */
--
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