linux-kernel - Re: [PATCH] writeback: skip balance_dirty

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Message-ID: <AANLkTimW4beh2Ta2TutKUeZ2fsER23r6E-MgW11ed6wK@mail.gmail.com>
Date:	Sat, 18 Dec 2010 00:42:18 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	Hugh Dickins <hughd@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jan Kara <jack@...e.cz>, Christoph Hellwig <hch@....de>,
	Trond Myklebust <Trond.Myklebust@...app.com>,
	Dave Chinner <david@...morbit.com>,
	"Theodore Ts'o" <tytso@....edu>,
	Chris Mason <chris.mason@...cle.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Mel Gorman <mel@....ul.ie>, Rik van Riel <riel@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Greg Thelen <gthelen@...gle.com>,
	linux-mm <linux-mm@...ck.org>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] writeback: skip balance_dirty_pages() for in-memory fs

On Sat, Dec 18, 2010 at 12:34 AM, Minchan Kim <minchan.kim@...il.com> wrote:
> On Fri, Dec 17, 2010 at 8:21 PM, Wu Fengguang <fengguang.wu@...el.com> wrote:
>> This avoids unnecessary checks and dirty throttling on tmpfs/ramfs.
>>
>> It also prevents
>>
>> [  388.126563] BUG: unable to handle kernel NULL pointer dereference at 0000000000000050
>>
>> in the balance_dirty_pages tracepoint, which will call
>>
>>        dev_name(mapping->backing_dev_info->dev)
>>
>> but shmem_backing_dev_info.dev is NULL.
>>
>> CC: Hugh Dickins <hughd@...gle.com>
>> Signed-off-by: Wu Fengguang <fengguang.wu@...el.com>
> Reviewed-by: Minchan Kim <minchan.kim@...il.com>
>
> Is it a material for -stable?

No. balance_dirty_pages tracepoint is new. :)

>
> --
> Kind regards,
> Minchan Kim
>



-- 
Kind regards,
Minchan Kim
--
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