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

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Message-ID: <20090504152026.GO4173@lenovo>
Date:	Mon, 4 May 2009 19:20:26 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Christoph Lameter <cl@...ux.com>, 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

[Cyrill Gorcunov - Mon, May 04, 2009 at 06:29:03PM +0400]
| [Christoph Lameter - Mon, May 04, 2009 at 10:13:34AM -0400]
| | On Mon, 4 May 2009, Cyrill Gorcunov wrote:
| | 
| | > 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)?
| | 
| | If you do not specify __GFP_NOWARN then it should give you messages,
| | 
| | Guess we need to very that it behaves in the right wya.
| |
| 
| thanks Christoph, I need to read a modified version (which
| is in -mm tree now). Maybe we could find a way indeed :)
| 
| 	-- Cyrill

You know I only found a message in case if page is already
not granted (ie NULL is going to be returned) and right
before that we print a warning about that (nopage: label).
Which means - no panic here and with (__GFP_NOFAIL | __GFP_REPEAT)
just spinning around in attepmt to allocate new memory. And how
to behave on atomic allocations. Almost give up... :)

	-- Cyrill
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