linux-kernel - Re: kupdate weirdness

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Message-ID: <20070802015318.GM12413810@sgi.com>
Date:	Thu, 2 Aug 2007 11:53:18 +1000
From:	David Chinner <dgc@....com>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: kupdate weirdness

On Wed, Aug 01, 2007 at 10:45:16PM +0200, Miklos Szeredi wrote:
> The following strange behavior can be observed:
> 
> 1. large file is written
> 2. after 30 seconds, nr_dirty goes down by 1024
> 3. then for some time (< 30 sec) nothing happens (disk idle)
> 4. then nr_dirty again goes down by 1024
> 5. repeat from 3. until whole file is written
> 
> So basically a 4Mbyte chunk of the file is written every 30 seconds.
> I'm quite sure this is not the intended behavior.
> 
> The reason seems to be that __sync_single_inode() will move the
> partially written inode from s_io onto s_dirty, and sync_sb_inode()
> will not splice it back onto s_io until the rest of the inodes on s_io
> has been processed.

It's been doing this for a long time.

http://marc.info/?l=linux-kernel&m=113919849421679&w=2

Cheers,

Dave.
-- 
Dave Chinner
Principal Engineer
SGI Australian Software Group
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