From: Christoph Lameter <clameter@sgi.com>
To: Hugh Dickins <hugh@veritas.com>
Cc: "Martin J. Bligh" <mbligh@aracnet.com>,
Nick Piggin <nickpiggin@yahoo.com.au>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
linux-mm@kvack.org, linux-ia64@vger.kernel.org
Subject: Re: removing mm->rss and mm->anon_rss from kernel?
Date: Mon, 08 Nov 2004 17:01:27 +0000 [thread overview]
Message-ID: <Pine.LNX.4.58.0411080858400.8212@schroedinger.engr.sgi.com> (raw)
In-Reply-To: <Pine.LNX.4.44.0411081649450.1433-100000@localhost.localdomain>
On Mon, 8 Nov 2004, Hugh Dickins wrote:
> > Maintaining these counters requires locking which interferes with Nick's
> > and my attempts to parallelize the vm.
>
> Aren't you rather overestimating the importance of one single,
> ideally atomic, increment per page fault?
We would need to investigate that in detail. What we know is that if
multiple cpus do atomic increments with an additional spinlock/unlock etc
as done today then we do have a significant performance impact due to
exclusive cache lines oscillating between cpus.
> It's great news if this is really the major scalability issue facing Linux.
Not sure. This may just be a part of it.
next prev parent reply other threads:[~2004-11-08 17:01 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <4189EC67.40601@yahoo.com.au>
[not found] ` <Pine.LNX.4.58.0411040820250.8211@schroedinger.engr.sgi.com>
[not found] ` <418AD329.3000609@yahoo.com.au>
[not found] ` <Pine.LNX.4.58.0411041733270.11583@schroedinger.engr.sgi.com>
[not found] ` <418AE0F0.5050908@yahoo.com.au>
[not found] ` <418AE9BB.1000602@yahoo.com.au>
[not found] ` <1099622957.29587.101.camel@gaston>
[not found] ` <418C55A7.9030100@yahoo.com.au>
2004-11-06 9:28 ` removing mm->rss and mm->anon_rss from kernel? Christoph Lameter
[not found] ` <204290000.1099754257@[10.10.2.4]>
2004-11-06 16:19 ` Christoph Lameter
2004-11-06 20:05 ` William Lee Irwin III
2004-11-07 16:11 ` Martin J. Bligh
2004-11-07 18:25 ` Matthew Wilcox
2004-11-08 12:43 ` Jesse Barnes
2004-11-08 15:26 ` Andi Kleen
2004-11-08 16:07 ` Christoph Lameter
2004-11-08 16:04 ` Christoph Lameter
2004-11-08 16:12 ` Anton Blanchard
2004-11-08 16:14 ` Martin J. Bligh
2004-11-08 16:25 ` Christoph Lameter
2004-11-08 16:30 ` Erich Focht
2004-11-08 16:57 ` Diego Calleja
2004-11-08 17:26 ` Erich Focht
2004-11-10 11:57 ` Magnus Damm
2004-11-06 20:51 ` Rik van Riel
2004-11-08 15:47 ` Russ Anderson
2004-11-08 16:08 ` Martin J. Bligh
2004-11-10 4:52 ` Nick Piggin
2004-11-10 17:30 ` Robin Holt
2004-11-10 18:50 ` Ray Bryant
2004-11-12 23:45 ` Ray Bryant
2004-11-13 0:05 ` Steve Neuner
2004-11-08 16:35 ` Rik van Riel
2004-11-08 16:56 ` Hugh Dickins
2004-11-08 17:01 ` Christoph Lameter [this message]
2004-11-09 2:40 ` Nick Piggin
2004-11-09 12:10 ` Matthew Wilcox
2004-11-10 0:48 ` Nick Piggin
2004-11-12 0:38 ` Christoph Lameter
2004-11-12 12:50 ` Robin Holt
2004-11-12 15:02 ` Christoph Lameter
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