From: Miklos Szeredi <miklos@szeredi.hu>
To: a.p.zijlstra@chello.nl
Cc: jdike@addtoit.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: per-bdi-throttling: synchronous writepage doesn't work correctly
Date: Thu, 01 Nov 2007 17:49:54 +0100 [thread overview]
Message-ID: <E1IndEw-00046x-00@dorka.pomaz.szeredi.hu> (raw)
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...
Miklos
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next reply other threads:[~2007-11-01 16:49 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-01 16:49 Miklos Szeredi [this message]
2007-11-01 16:51 ` Peter Zijlstra
2007-11-01 17:00 ` Miklos Szeredi
2007-11-01 17:09 ` Peter Zijlstra
2007-11-01 17:16 ` Peter Zijlstra
2007-11-01 18:35 ` Peter Zijlstra
2007-11-01 19:19 ` Miklos Szeredi
2007-11-01 19:55 ` Peter Zijlstra
2007-11-01 17:28 ` Miklos Szeredi
2007-11-01 17:39 ` Peter Zijlstra
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