Subject: Re: nfs unhappiness with memory pressure
From: Trond Myklebust <trond.myklebust@fys.uio.no>
To: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Kenny Simpson <theonetruekenny@yahoo.com>, Andrew Morton <akpm@osdl.org>,
       linux-kernel@vger.kernel.org
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	 <1133813590.12393.7.camel@lade.trondhjem.org>
	 <1133814806.12393.10.camel@lade.trondhjem.org>
	 <4394A87E.7050507@yahoo.com.au>
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Date: Mon, 05 Dec 2005 16:18:56 -0500
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On Tue, 2005-12-06 at 07:52 +1100, Nick Piggin wrote:

> The VM doesn't expect to have to rely on pdflush to write out pages
> for it. ->writepage should be enough. Adding wakeup_pdflush here
> actually could do the wrong thing for non-NFS filesystems if it
> starts more writeback.

nr_unstable is not going to be set for non-NFS filesystems. 'unstable'
is a caching state in which pages have been written out to the NFS
server, but the server has not yet flushed the data to disk.

Cheers,
  Trond

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