From: Andrew Morton <akpm@zip.com.au>
To: William Lee Irwin III <wli@holomorphy.com>
Cc: Rik van Riel <riel@conectiva.com.br>,
Andrea Arcangeli <andrea@suse.de>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
Linus Torvalds <torvalds@transmeta.com>
Subject: Re: vm lock contention reduction
Date: Fri, 05 Jul 2002 16:48:28 -0700 [thread overview]
Message-ID: <3D26304C.51FAE560@zip.com.au> (raw)
In-Reply-To: 20020705231113.GA25360@holomorphy.com
William Lee Irwin III wrote:
>
> On Thu, Jul 04, 2002 at 07:18:34PM -0700, Andrew Morton wrote:
> > Of course, that change means that we wouldn't be able to throttle
> > page allocators against IO any more, and we'd have to do something
> > smarter. What a shame ;)
>
> This is actually necessary IMHO. Some testing I've been able to do seems
> to reveal the current throttling mechanism as inadequate.
>
I don't think so. If you're referring to the situation where your
4G machine had 3.5G dirty pages without triggering writeback.
That's not a generic problem. It's something specific to your
setup. You're going to have to repeat it and stick some printk's
into balance_dirty_pages(). No other way of finding it.
Possibly it's an arith overflow in there, but I more suspect that
your nr_pagecache_pages() function is returning an incorrect value.
This happened to David M-T just this week in the 2.4 kernel - the
nr_buffermem_pages() function was returning a bad value due to an
unaccounted-for hole in the memory map and the observed effect
was just the same.
So. Please debug it.
-
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next prev parent reply other threads:[~2002-07-05 23:48 UTC|newest]
Thread overview: 87+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-07-04 23:05 vm lock contention reduction Andrew Morton
2002-07-04 23:26 ` Rik van Riel
2002-07-04 23:27 ` Rik van Riel
2002-07-05 1:37 ` Andrew Morton
2002-07-05 1:49 ` Rik van Riel
2002-07-05 2:18 ` Andrew Morton
2002-07-05 2:16 ` Rik van Riel
2002-07-05 2:53 ` Andrew Morton
2002-07-05 3:52 ` Benjamin LaHaise
2002-07-05 4:47 ` Linus Torvalds
2002-07-05 5:38 ` Andrew Morton
2002-07-05 5:51 ` Linus Torvalds
2002-07-05 6:08 ` Linus Torvalds
2002-07-05 6:27 ` Alexander Viro
2002-07-05 6:33 ` Andrew Morton
2002-07-05 7:33 ` Andrea Arcangeli
2002-07-07 2:50 ` Andrew Morton
2002-07-07 3:05 ` Linus Torvalds
2002-07-07 3:47 ` Andrew Morton
2002-07-08 11:39 ` Enhanced profiling support (was Re: vm lock contention reduction) John Levon
2002-07-08 11:39 ` John Levon
2002-07-08 17:52 ` Linus Torvalds
2002-07-08 17:52 ` Linus Torvalds
2002-07-08 18:41 ` Karim Yaghmour
2002-07-08 18:41 ` Karim Yaghmour
2002-07-10 2:22 ` John Levon
2002-07-10 2:22 ` John Levon
2002-07-10 4:16 ` Karim Yaghmour
2002-07-10 4:16 ` Karim Yaghmour
2002-07-10 4:38 ` John Levon
2002-07-10 4:38 ` John Levon
2002-07-10 5:46 ` Karim Yaghmour
2002-07-10 5:46 ` Karim Yaghmour
2002-07-10 13:10 ` bob
2002-07-10 13:10 ` bob
2002-07-09 16:57 ` John Levon
2002-07-09 19:56 ` Karim Yaghmour
2002-07-07 5:16 ` vm lock contention reduction Martin J. Bligh
2002-07-07 6:13 ` scalable kmap (was Re: vm lock contention reduction) Martin J. Bligh
2002-07-07 6:37 ` Andrew Morton
2002-07-07 7:53 ` Linus Torvalds
2002-07-07 9:04 ` Andrew Morton
2002-07-07 16:13 ` Martin J. Bligh
2002-07-07 18:31 ` Linus Torvalds
2002-07-07 18:55 ` Linus Torvalds
2002-07-07 19:02 ` Linus Torvalds
2002-07-08 7:24 ` Andrew Morton
2002-07-08 8:09 ` Andrea Arcangeli
2002-07-08 14:50 ` William Lee Irwin III
2002-07-08 20:39 ` Andrew Morton
2002-07-08 21:08 ` Benjamin LaHaise
2002-07-08 21:45 ` Andrew Morton
2002-07-08 22:24 ` Benjamin LaHaise
2002-07-07 16:00 ` Martin J. Bligh
2002-07-07 18:28 ` Linus Torvalds
2002-07-08 7:11 ` Andrea Arcangeli
2002-07-08 10:15 ` Eric W. Biederman
2002-07-08 7:00 ` Andrea Arcangeli
2002-07-08 17:29 ` Martin J. Bligh
2002-07-08 22:14 ` Linus Torvalds
2002-07-09 0:16 ` Andrew Morton
2002-07-09 3:17 ` Andrew Morton
2002-07-09 4:28 ` Martin J. Bligh
2002-07-09 5:28 ` Andrew Morton
2002-07-09 6:15 ` Martin J. Bligh
2002-07-09 6:30 ` William Lee Irwin III
2002-07-09 6:32 ` William Lee Irwin III
2002-07-09 16:08 ` Martin J. Bligh
2002-07-09 17:32 ` Andrea Arcangeli
2002-07-10 5:32 ` Andrew Morton
2002-07-10 22:43 ` Martin J. Bligh
2002-07-10 23:08 ` Andrew Morton
2002-07-10 23:26 ` Martin J. Bligh
2002-07-11 0:19 ` Andrew Morton
2002-07-12 17:48 ` Martin J. Bligh
2002-07-13 11:18 ` Andrea Arcangeli
2002-07-09 13:59 ` Benjamin LaHaise
2002-07-08 0:38 ` vm lock contention reduction William Lee Irwin III
2002-07-05 6:46 ` Andrew Morton
2002-07-05 14:25 ` Rik van Riel
2002-07-05 23:11 ` William Lee Irwin III
2002-07-05 23:48 ` Andrew Morton [this message]
2002-07-06 0:11 ` Rik van Riel
2002-07-06 0:31 ` Linus Torvalds
2002-07-06 0:45 ` Rik van Riel
2002-07-06 0:48 ` Andrew Morton
2002-07-08 0:59 ` William Lee Irwin III
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