On Mon, 19 May 2008, David Chinner wrote:

quoted text
> Defragmentation is triggered as part of the usual memory reclaim
> process. Which implies we've run out of free memory, correct?

Yes but we have already reclaimed some memory.

quoted text
> > How do you trigger such a special writeout?
> 
> filemap_fdatawrite_range() perhaps?

Could you provide me such a patch? I would not know how much to writeout. 
If we had such a method then we could also use that for the swap case 
where we also write out single pages?
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