Re: [patch 1/5] mm: add nofail variants of kmalloc kcalloc andkzalloc

[David Rientjes]

On Wed, 25 Aug 2010, Christoph Lameter wrote:

> > Right, I thought you said the slab layer passes __GFP_NOFAIL when there's
> > no objects available.
> 
> Yes, the slab layer calls the page allocator when there are no objects
> available and passes the __GFP_NOFAIL that the user may have set in the
> call to the page allocator.
> 
> Why then add new functions that do the same?
> 

Because we can remove the flag, remove branches from the page allocator 
slowpath, and none of these allocations actually are dependent on 
__GFP_NOFAIL since they are all under PAGE_ALLOC_COSTLY_ORDER.
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