linux-kernel - Re: [PATCH -tip] mm: introduce __GFP

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Message-ID: <20090504141256.GK4173@lenovo>
Date:	Mon, 4 May 2009 18:12:56 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Christoph Lameter <cl@...ux.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mel@....ul.ie>,
	LKML <linux-kernel@...r.kernel.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Rik van Riel <riel@...hat.com>,
	David Rientjes <rientjes@...gle.com>,
	Pavel Emelyanov <xemul@...nvz.org>
Subject: Re: [PATCH -tip] mm: introduce __GFP_PANIC modifier

[Christoph Lameter - Mon, May 04, 2009 at 09:47:45AM -0400]
| 
| 
| Could you try to avoid consuming another GFP flag? __GFP_BITS_SHIFT is
| used elsewhere to figure out where to put miscellanous flags into the gfp
| mask. This is pretty limited right now and so the patch does work.
| 
| But maybe we can combine some flags __GFP_NOFAIL | __GFP_REPEAT or so?
| 
| __GFP_NOFAIL already has the semantics that the allocation cannot fail and
| that the page allocator must never return NULL.
| 
| 

As I see page allocator already quite modified in -mm tree.
Christoph will kmalloc with (__GFP_NOFAIL | __GFP_REPEAT)
inform us on exhausted memory? Or we just stuck with blank
screen instead (not blank actually but with previous messages)?

	-- Cyrill
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