Re: irq lock inversion

From: Peter Zijlstra
Date: Sat Nov 07 2009 - 11:14:13 EST

On Fri, 2009-11-06 at 12:03 -0500, Christoph Lameter wrote:
> Atomic allocs are allowed to fail.

All allocs (except __GFP_NOFAIL, but those are a deadlock waiting to
happen) are allowed to fail, !__GFP_WAIT allocs simply fail more easily.

The fact that __GFP_WAIT && order <= PAGE_ALLOC_COSTLY_ORDER allocations
currently don't fail but keep hammering the allocator could be
considered a bug (the recent OOM threads in fact suggest this is a
serious issue for some people).

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