linux-kernel - Re: [PATCH 2/3] page allocator: Do not allow interrupts to use ALLOC

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Message-ID: <4AED9EB4.5080601@redhat.com>
Date:	Sun, 01 Nov 2009 09:44:04 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Pavel Machek <pavel@....cz>
CC:	David Rientjes <rientjes@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mel@....ul.ie>, stable@...nel.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Frans Pop <elendil@...net.nl>, Jiri Kosina <jkosina@...e.cz>,
	Sven Geggus <lists@...hsschwanzdomain.de>,
	Karol Lewandowski <karol.k.lewandowski@...il.com>,
	Tobias Oetiker <tobi@...iker.ch>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Stephan von Krawczynski <skraw@...net.com>,
	kernel-testers@...r.kernel.org
Subject: Re: [PATCH 2/3] page allocator: Do not allow interrupts to use ALLOC_HARDER

On 11/01/2009 02:35 AM, Pavel Machek wrote:
>>> I believe it would be better to simply remove it.
>>
>> You are against trying to give the realtime tasks a best effort
>> advantage at memory allocation?
>
> Yes. Those memory reserves were for kernel, GPF_ATOMIC and stuff. Now
> realtime tasks are allowed to eat into them. That feels wrong.
>
> "realtime" tasks are not automatically "more important".
>
>> Realtime apps often *have* to allocate memory on the kernel side,
>> because they use network system calls, etc...
>
> So what? As soon as they do that, they lose any guarantees, anyway.

They might lose the absolute guarantee, but that's no reason
not to give it our best effort!

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