Message-ID: <4AECC04B.9060808@redhat.com>
Date: Sat, 31 Oct 2009 18:55:07 -0400
From: Rik van Riel <riel@redhat.com>
Organization: Red Hat, Inc
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To: Pavel Machek <pavel@ucw.cz>
CC: David Rientjes <rientjes@google.com>,
       Andrew Morton <akpm@linux-foundation.org>, Mel Gorman <mel@csn.ul.ie>,
       stable@kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org,
       Frans Pop <elendil@planet.nl>, Jiri Kosina <jkosina@suse.cz>,
       Sven Geggus <lists@fuchsschwanzdomain.de>,
       Karol Lewandowski <karol.k.lewandowski@gmail.com>,
       Tobias Oetiker <tobi@oetiker.ch>,
       KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
       Pekka Enberg <penberg@cs.helsinki.fi>,
       Christoph Lameter <cl@linux-foundation.org>,
       Stephan von Krawczynski <skraw@ithnet.com>,
       kernel-testers@vger.kernel.org
Subject: Re: [PATCH 2/3] page allocator: Do not allow interrupts to use ALLOC_HARDER
References: <1256650833-15516-1-git-send-email-mel@csn.ul.ie> <1256650833-15516-3-git-send-email-mel@csn.ul.ie> <20091027130924.fa903f5a.akpm@linux-foundation.org> <alpine.DEB.2.00.0910271411530.9183@chino.kir.corp.google.com> <20091031184054.GB1475@ucw.cz> <alpine.DEB.2.00.0910311248490.13829@chino.kir.corp.google.com> <20091031201158.GB29536@elf.ucw.cz> <alpine.DEB.2.00.0910311413160.25524@chino.kir.corp.google.com> <20091031222905.GA32720@elf.ucw.cz>
In-Reply-To: <20091031222905.GA32720@elf.ucw.cz>
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On 10/31/2009 06:29 PM, Pavel Machek wrote:

> Well, you are trying to make rt heuristic more precise.

No he's not.  He is trying to make it only apply to real time
tasks, not to interrupts that happen to interrupt the realtime
tasks.

 > 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?

Realtime apps often *have* to allocate memory on the kernel side,
because they use network system calls, etc...

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