linux-kernel - Re: [PATCH 7/6] Lost bits - fix PG_writeback vs PG

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Message-Id: <1156536687.5927.25.camel@localhost>
Date:	Fri, 25 Aug 2006 16:11:27 -0400
From:	Trond Myklebust <trond.myklebust@....uio.no>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...l.org>, Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH 7/6] Lost bits - fix PG_writeback vs PG_private race in
	NFS

On Fri, 2006-08-25 at 18:36 +0200, Peter Zijlstra wrote:
> Make sure we clear PG_writeback after we clear PG_private, otherwise
> weird and wonderfull stuff will happen.
> 
NACK.

Look carefully at the case of unstable writes: your patch does nothing
to guarantee that PG_writeback is cleared after PG_private for that
case.
Anyhow, you don't explain exactly what is wrong with clearing
PG_writeback before PG_private.

Cheers,
  Trond

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