From mboxrd@z Thu Jan  1 00:00:00 1970
From: Peter Zijlstra <peterz@infradead.org>
Subject: Re: [PATCH 0/2][RFC] VFCIPI v3
Date: Tue, 31 Jul 2007 18:22:20 +0200
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Cc: Ingo Molnar <mingo@elte.hu>, linux-kernel@vger.kernel.org,
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To: Gregory Haskins <ghaskins@novell.com>
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On Tue, 2007-07-31 at 12:14 -0400, Gregory Haskins wrote:

> Out of curiosity and for my own edification:  What *is* GFP_ATOMIC meant for?

It is meant as you used it, _except_ for !PREEMPT_RT.

With PREEMPT_RT all allocators are fully preemptable, that is both the
slab as well as the underlying page allocator.

Allocation from atomic context is a BUG() with -rt.