linux-kernel - Re: [PATCH 1/2] mm: Introduce GFP_PANIC for early-boot allocations

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Date:	Sat, 9 May 2009 10:31:16 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Pekka Enberg <penberg@...helsinki.fi>
Cc:	Christoph Lameter <cl@...ux-foundation.org>,
	akpm@...ux-foundation.org, gorcunov@...nvz.org,
	kosaki.motohiro@...fujitsu.com, mel@....ul.ie, riel@...hat.com,
	linux-kernel@...r.kernel.org, rientjes@...gle.com
Subject: Re: [PATCH 1/2] mm: Introduce GFP_PANIC for early-boot allocations


* Pekka Enberg <penberg@...helsinki.fi> wrote:

> On Fri, 2009-05-08 at 11:29 -0400, Christoph Lameter wrote:
> > On Fri, 8 May 2009, Pekka Enberg wrote:
> > 
> > > From: Pekka Enberg <penberg@...helsinki.fi>
> > >
> > > This patch introduces a GFP_PANIC flag that can be used as an annotation
> > > that an early-boot call to kmalloc() or alloc_pages() is expected to
> > > never fail.
> > 
> > I think the early-boot requirement needs to be dropped. Make this safe to
> > be used at anytime.
> 
> OK, here's an updated patch description:
> 
> Subject: [PATCH 1/2] mm: Introduce GFP_PANIC
> From: Pekka Enberg <penberg@...helsinki.fi>
> 
> This patch introduces a GFP_PANIC flag that can be used as an annotation
> that a kmalloc() or alloc_pages() call is expected to never fail which is
> useful for early-boot code, for example.
> 
> To save one GFP flag bit, use a combination of __GFP_NOFAIL and
> __GFP_NOREPEAT to make sure we always end up in the "nopage" path of the
> page allocator if an allocation fails.
> 
> [ gorcunov@...nvz.org: initial version of the patch ]
> Cc: Christoph Lameter <cl@...ux-foundation.org>
> Cc: David Rientjes <rientjes@...gle.com>
> Cc: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
> Cc: Mel Gorman <mel@....ul.ie>
> Cc: Rik van Riel <riel@...hat.com>
> Signed-off-by: Pekka Enberg <penberg@...helsinki.fi>

Thanks Pekka for taking care of this,

Acked-by: Ingo Molnar <mingo@...e.hu>

	Ingo
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