linux-kernel - Re: [PATCH 2/3] Fix fsync livelock

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Message-ID: <20081006065024.380d1d00@infradead.org>
Date:	Mon, 6 Oct 2008 06:50:24 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Mikulas Patocka <mpatocka@...hat.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, agk@...hat.com, mbroz@...hat.com,
	chris@...chsys.com
Subject: Re: [PATCH 2/3] Fix fsync livelock

On Mon, 6 Oct 2008 09:00:14 -0400 (EDT)
Mikulas Patocka <mpatocka@...hat.com> wrote:

> On Sun, 5 Oct 2008, Arjan van de Ven wrote:
> 
> > On Sun, 5 Oct 2008 23:30:51 -0400 (EDT
> > > The point is that many fsync()s may run in parallel and you have
> > > just one inode and just one chain. And if you add two-word
> > > list_head to a page, to link it on this list, many developers
> > > will hate it for increasing its size.
> > 
> > why to a page?
> > a list head in the inode and chain up the bios....
> 
> And if you want to wait for a bio submitted by a different process? 
> There's no way you can find the bio from the page.

the point is that the kernel would always chain it to the inode,
independent of who or when it is submitted


-- 
Arjan van de Ven 	Intel Open Source Technology Centre
For development, discussion and tips for power savings, 
visit http://www.lesswatts.org
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