From: William Lee Irwin III <wli@holomorphy.com>
To: Andrea Arcangeli <andrea@suse.de>
Cc: Peter Zaitsev <peter@mysql.com>, Andrew Morton <akpm@osdl.org>,
linux-kernel@vger.kernel.org
Subject: Re: VM Problems in 2.6.7 (Too active OOM Killer)
Date: Wed, 14 Jul 2004 17:43:50 -0700 [thread overview]
Message-ID: <20040715004350.GD3411@holomorphy.com> (raw)
In-Reply-To: <20040715000438.GS974@dualathlon.random>
On Thu, Jul 15, 2004 at 02:04:38AM +0200, Andrea Arcangeli wrote:
> About the ZONE_NORMAL shortage without swap, rather than running
> cpu-cache-hungry memcopies from lowmemzone to highmem (or even worse to
> pass through swap like it happens in 2.6 mainline with swap enabled), I
> believe it's better to reserve some ram in the lowmem zone, 800M of ram
> on a 32G box should be a cheap price to pay compared to the cpu/IO cost
> involved in moving memory around during the bench.
I wouldn't be so quick to dismiss it. There are enough physical
placement issues already even without pinned userspace pages.
Empowering the kernel to remain largely oblivious to physical placement
of userspace pages would be very convenient and eliminate many problems.
Also, given that the alternatives are IO and allocation failure, I
wouldn't be so quick to dismiss it as slow, either. Unfortunately even
page relocation is only a half-measure while mapping->gfp_mask persists.
-- wli
next prev parent reply other threads:[~2004-07-15 0:46 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-07-14 2:23 VM Problems in 2.6.7 (Too active OOM Killer) Peter Zaitsev
2004-07-14 2:40 ` William Lee Irwin III
2004-07-14 3:20 ` Peter Zaitsev
2004-07-14 3:17 ` Andrea Arcangeli
2004-07-14 3:44 ` Peter Zaitsev
2004-07-14 4:10 ` Andrea Arcangeli
2004-07-14 4:22 ` Andrew Morton
2004-07-14 4:47 ` Andrea Arcangeli
2004-07-14 4:17 ` Andrew Morton
2004-07-14 23:47 ` Peter Zaitsev
2004-07-14 22:44 ` Andrew Morton
2004-07-15 0:06 ` Andrea Arcangeli
2004-07-15 0:30 ` Peter Zaitsev
2004-07-15 0:46 ` Andrea Arcangeli
2004-07-15 1:54 ` William Lee Irwin III
2004-07-15 2:13 ` Peter Zaitsev
2004-07-15 2:33 ` William Lee Irwin III
2004-07-15 2:39 ` William Lee Irwin III
2004-07-15 2:44 ` William Lee Irwin III
2004-08-13 22:23 ` William Lee Irwin III
2004-07-19 20:27 ` Bill Davidsen
2004-07-18 16:13 ` Kurt Garloff
2004-07-20 9:14 ` R. J. Wysocki
2004-07-20 13:29 ` Andrea Arcangeli
2004-07-20 13:53 ` William Lee Irwin III
2004-07-20 13:29 ` William Lee Irwin III
2004-07-19 20:21 ` Bill Davidsen
2004-07-15 0:04 ` Andrea Arcangeli
2004-07-15 0:43 ` Peter Zaitsev
2004-07-15 0:43 ` William Lee Irwin III [this message]
2004-07-15 1:04 ` Peter Zaitsev
2004-07-15 1:29 ` William Lee Irwin III
2004-07-14 3:50 ` William Lee Irwin III
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