From: Pavel Machek <pavel@ucw.cz>
To: Rik van Riel <riel@redhat.com>
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
Date: Sun, 1 Nov 2009 20:32:47 +0100 [thread overview]
Message-ID: <20091101193247.GA2155@elf.ucw.cz> (raw)
In-Reply-To: <4AED9EB4.5080601@redhat.com>
On Sun 2009-11-01 09:44:04, Rik van Riel wrote:
> 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!
You know, there's no reason not to give best effort to normal tasks,
too...
Well, OTOH that means that realtime tasks can now interfere with
interrupt memory allocations...
Anyway, I guess this is not terribly important...
Pavel
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next prev parent reply other threads:[~2009-11-01 19:32 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-27 13:40 [PATCH 0/3] Reduce GFP_ATOMIC allocation failures, partial fix V3 Mel Gorman
2009-10-27 13:40 ` [PATCH 1/3] page allocator: Always wake kswapd when restarting an allocation attempt after direct reclaim failed Mel Gorman
2009-10-27 13:40 ` [PATCH 2/3] page allocator: Do not allow interrupts to use ALLOC_HARDER Mel Gorman
[not found] ` <1256650833-15516-3-git-send-email-mel-wPRd99KPJ+uzQB+pC5nmwQ@public.gmane.org>
2009-10-27 20:09 ` Andrew Morton
2009-10-27 21:12 ` David Rientjes
2009-10-31 18:40 ` Pavel Machek
2009-10-31 19:51 ` David Rientjes
2009-10-31 20:11 ` Pavel Machek
2009-10-31 21:19 ` David Rientjes
2009-10-31 22:29 ` Pavel Machek
2009-10-31 22:55 ` Rik van Riel
2009-11-01 7:35 ` Pavel Machek
2009-11-01 12:37 ` KOSAKI Motohiro
2009-11-01 14:44 ` Rik van Riel
2009-11-01 19:32 ` Pavel Machek [this message]
2009-11-02 16:38 ` Christoph Lameter
2009-10-31 23:59 ` Rik van Riel
2009-11-02 16:42 ` Christoph Lameter
2009-11-02 20:53 ` David Rientjes
2009-11-03 17:10 ` Christoph Lameter
2009-11-04 1:46 ` David Rientjes
2009-11-04 9:01 ` Pavel Machek
2009-11-09 10:11 ` Mel Gorman
2009-10-28 10:24 ` Mel Gorman
2009-10-27 13:40 ` [PATCH 3/3] vmscan: Force kswapd to take notice faster when high-order watermarks are being hit Mel Gorman
2009-10-27 18:18 ` Rik van Riel
2009-10-27 20:19 ` Andrew Morton
2009-10-28 3:54 ` KOSAKI Motohiro
2009-10-28 10:29 ` Mel Gorman
2009-10-28 19:47 ` Andrew Morton
2009-11-02 16:05 ` Mel Gorman
2009-11-02 17:32 ` Frans Pop
2009-11-02 17:38 ` Mel Gorman
2009-11-02 20:36 ` Mel Gorman
2009-11-03 22:01 ` Frans Pop
2009-11-03 22:08 ` Mel Gorman
2009-11-04 0:01 ` Frans Pop
2009-11-04 1:18 ` Mel Gorman
2009-11-04 2:05 ` Frans Pop
2009-11-04 2:08 ` Frans Pop
2009-11-04 15:48 ` Mel Gorman
2009-11-04 20:57 ` Frans Pop
2009-11-05 16:48 ` [PATCH 3/3] vmscan: Force kswapd to take notice faster when high-order watermarks are being hit (data on latencies available) Mel Gorman
2009-11-12 11:36 ` Frans Pop
2009-11-04 2:08 ` [PATCH 3/3] vmscan: Force kswapd to take notice faster when high-order watermarks are being hit Mel Gorman
2009-10-28 13:02 ` [PATCH 0/3] Reduce GFP_ATOMIC allocation failures, partial fix V3 Karol Lewandowski
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