Subject: Re: irq lock inversion
From: Peter Zijlstra <peterz@infradead.org>
To: Christoph Lameter <cl@linux-foundation.org>
Cc: Tejun Heo <tj@kernel.org>, Ingo Molnar <mingo@elte.hu>,
       Nick Piggin <npiggin@suse.de>, Jiri Kosina <jkosina@suse.cz>,
       Yinghai Lu <yhlu.kernel@gmail.com>,
       Thomas Gleixner <tglx@linutronix.de>, linux-kernel@vger.kernel.org
In-Reply-To: <alpine.DEB.1.10.0911061159450.5187@V090114053VZO-1>
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	 <4AF25FC7.4000502@kernel.org> <20091105082102.GA2870@elte.hu>
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	 <4AF3B9BD.9050300@kernel.org> <20091106071711.GA20946@elte.hu>
	 <4AF3D428.8000804@kernel.org> <20091106075820.GA28227@elte.hu>
	 <4AF3DD30.8050200@kernel.org> <20091106084041.GA22505@elte.hu>
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Date: Sat, 07 Nov 2009 17:13:32 +0100
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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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