linux-kernel - Re: [PATCH 0/2][RFC] VFCIPI v3

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Message-Id: <1185898941.12034.22.camel@twins>
Date:	Tue, 31 Jul 2007 18:22:20 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Gregory Haskins <ghaskins@...ell.com>
Cc:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	linux-rt-users@...r.kernel.org
Subject: Re: [PATCH 0/2][RFC] VFCIPI v3

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.

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