Re: [PATCH] mm: avoid livelock on !__GFP_FS allocations

[David Rientjes]

On Tue, 25 Oct 2011, Colin Cross wrote:

> > Or, rather, when pm_restrict_gfp_mask() clears __GFP_IO and __GFP_FS that
> > it also has the same behavior as __GFP_NORETRY in should_alloc_retry() by
> > setting a variable in file scope.
> >
> 
> Why do you prefer that over adding a gfp_required_mask?
> 

Because it avoids an unnecessary OR in the page and slab allocator 
fastpaths which are red hot :)
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