linux-kernel - Re: [PATCH 3/6] writeback: avoid unnecessary calculation of bdi dirty thresholds

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Message-Id: <20100719143520.d9af9649.akpm@linux-foundation.org>
Date:	Mon, 19 Jul 2010 14:35:20 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Dave Chinner <david@...morbit.com>, Jan Kara <jack@...e.cz>,
	<linux-fsdevel@...r.kernel.org>,
	Linux Memory Management List <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/6] writeback: avoid unnecessary calculation of bdi
 dirty thresholds

On Sun, 11 Jul 2010 10:06:59 +0800
Wu Fengguang <fengguang.wu@...el.com> wrote:

> Split get_dirty_limits() into global_dirty_limits()+bdi_dirty_limit(),
> so that the latter can be avoided when under global dirty background
> threshold (which is the normal state for most systems).
> 

mm/page-writeback.c: In function 'balance_dirty_pages_ratelimited_nr':
mm/page-writeback.c:466: warning: 'dirty_exceeded' may be used uninitialized in this function

This was a real bug.

--- a/mm/page-writeback.c~writeback-avoid-unnecessary-calculation-of-bdi-dirty-thresholds-fix
+++ a/mm/page-writeback.c
@@ -463,7 +463,7 @@ static void balance_dirty_pages(struct a
 	unsigned long bdi_thresh;
 	unsigned long pages_written = 0;
 	unsigned long pause = 1;
-	int dirty_exceeded;
+	bool dirty_exceeded = false;
 	struct backing_dev_info *bdi = mapping->backing_dev_info;
 
 	for (;;) {
_

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