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Date: Mon, 4 May 2009 18:12:56 +0400
From: Cyrill Gorcunov <gorcunov@gmail.com>
To: Christoph Lameter <cl@linux.com>
Cc: Ingo Molnar <mingo@elte.hu>, Andrew Morton <akpm@linux-foundation.org>,
       Mel Gorman <mel@csn.ul.ie>, LKML <linux-kernel@vger.kernel.org>,
       Pekka Enberg <penberg@cs.helsinki.fi>, Rik van Riel <riel@redhat.com>,
       David Rientjes <rientjes@google.com>,
       Pavel Emelyanov <xemul@openvz.org>
Subject: Re: [PATCH -tip] mm: introduce __GFP_PANIC modifier
Message-ID: <20090504141256.GK4173@lenovo>
References: <20090504122740.GH4173@lenovo> <20090504131311.GA23330@elte.hu> <20090504131638.GJ4173@lenovo> <alpine.DEB.1.10.0905040940490.9553@qirst.com>
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[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