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Date: Sun, 11 Aug 2002 22:51:19 -0700
From: Andrew Morton <akpm@zip.com.au>
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To: Rik van Riel <riel@conectiva.com.br>
CC: Linus Torvalds <torvalds@transmeta.com>,
       lkml <linux-kernel@vger.kernel.org>
Subject: Re: [patch 9/21] batched addition of pages to the LRU
References: <3D57449E.4FADF44@zip.com.au> <Pine.LNX.4.44L.0208120222420.23404-100000@imladris.surriel.com>
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Rik van Riel wrote:
> 
> On Sun, 11 Aug 2002, Andrew Morton wrote:
> 
> > And it only takes one dirty block!  Any LRU page which is dirty
> > against a blocked queue is like a hand grenade floating
> > down a stream [1].  If some innocent task tries to write that
> > page it gets DoSed via the request queue.
> 
> This is exactly why we shouldn't wait on dirty pages in
> the pageout path.

It's not the wait-on-writeback which is the problem.  It's
the writeout.   Perhaps that's what you meant.
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