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Date: Thu, 01 Nov 2007 17:51:26 +0100
From: Peter Zijlstra <a.p.zijlstra@...llo.nl>
To: Miklos Szeredi <miklos@...redi.hu>
Cc: jdike@...toit.com, linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: per-bdi-throttling: synchronous writepage doesn't work
correctly
On Thu, 2007-11-01 at 17:49 +0100, Miklos Szeredi wrote:
> Hi,
>
> It looks like bdi_thresh will always be zero if filesystem does
> synchronous writepage, resulting in very poor write performance.
>
> Hostfs (UML) is one such example, but there might be others.
>
> The only solution I can think of is to add a set_page_writeback();
> end_page_writeback() pair (or some reduced variant, that only does
> the proportions magic). But that means auditing quite a few
> filesystems...
Ouch...
I take it there is no other function that is shared between all these
writeout paths which we could stick a bdi_writeout_inc(bdi) in?
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