Re: nfs unhappiness with memory pressure

[Trond Myklebust]

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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