On Thu, 25 Oct 2007, Nick Piggin wrote:

quoted text
> > Ummm... all unreclaimable is set! Are you mlocking the pages in memory? Or
> > what causes this? All pages under writeback? What is the dirty ratio set
> > to?
> 
> Why is SLUB behaving differently, though.

Nore sure. Are we really sure that this does not occur using SLAB?
 
quoted text
> Memory efficiency wouldn't be the reason, would it? I mean, SLUB
> should be more efficient than SLAB, plus have less data lying around
> in queues.

SLAB may have data around in queues which (if the stars align the right 
way) may allow it to go longer without having to get a page from the page 
allocator.
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