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From: Andrew Morton <akpm@linux-foundation.org>
To: Christoph Lameter <cl@linux-foundation.org>
Cc: peterz@infradead.org, rientjes@google.com, npiggin@suse.de,
menage@google.com, dfults@sgi.com, linux-kernel@vger.kernel.org,
containers@lists.osdl.org
Subject: Re: [patch 0/7] cpuset writeback throttling
Date: Tue, 4 Nov 2008 14:35:34 -0800 [thread overview]
Message-ID: <20081104143534.b5c16147.akpm@linux-foundation.org> (raw)
In-Reply-To: <Pine.LNX.4.64.0811041601100.5077@quilx.com>
On Tue, 4 Nov 2008 16:17:52 -0600 (CST)
Christoph Lameter <cl@linux-foundation.org> wrote:
> On Tue, 4 Nov 2008, Andrew Morton wrote:
>
> > What are the alternatives here? What do we need to do to make
> > throttling a per-memcg thing?
>
> Add statistics to the memcg lru and then you need some kind of sets of
> memcgs that are represented by bitmaps or so attached to an inode.
>
> > The patchset is badly misnamed, btw. It doesn't throttle writeback -
> > in fact several people are working on IO bandwidth controllers and
> > calling this thing "writeback throttling" risks confusion.
>
> It is limiting dirty pages and throttling the dirty rate of applications
> in a NUMA system (same procedure as we do in non NUMA). The excessive
> dirtying without this patchset can cause OOMs to occur on NUMA systems.
yup.
To fix this with a memcg-based throttling, the operator would need to
be able to create memcg's which have pages only from particular nodes.
(That's a bit indirect relative to what they want to do, but is
presumably workable).
But do we even have that capability now?
next prev parent reply other threads:[~2008-11-04 22:36 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-30 19:23 David Rientjes
2008-10-30 19:23 ` [patch 1/7] cpusets: add dirty map to struct address_space David Rientjes
2008-11-04 21:09 ` Andrew Morton
2008-11-04 21:20 ` Christoph Lameter
2008-11-04 21:42 ` Andrew Morton
2008-10-30 19:23 ` [patch 2/7] pdflush: allow the passing of a nodemask parameter David Rientjes
2008-10-30 19:23 ` [patch 3/7] mm: make page writeback obey cpuset constraints David Rientjes
2008-10-30 19:23 ` [patch 4/7] mm: cpuset aware reclaim writeout David Rientjes
2008-10-30 19:23 ` [patch 5/7] mm: throttle writeout with cpuset awareness David Rientjes
2008-10-30 19:23 ` [patch 6/7] cpusets: per cpuset dirty ratios David Rientjes
2008-10-30 19:23 ` [patch 7/7] cpusets: update documentation for writeback throttling David Rientjes
2008-10-30 21:08 ` [patch 0/7] cpuset " Dave Chinner
2008-10-30 21:33 ` Christoph Lameter
2008-10-30 22:03 ` Dave Chinner
2008-10-31 13:47 ` Christoph Lameter
2008-10-31 16:36 ` David Rientjes
2008-11-04 20:47 ` Andrew Morton
2008-11-04 20:53 ` Peter Zijlstra
2008-11-04 20:58 ` Christoph Lameter
2008-11-04 21:10 ` David Rientjes
2008-11-04 21:16 ` Andrew Morton
2008-11-04 21:21 ` Peter Zijlstra
2008-11-04 21:50 ` Andrew Morton
2008-11-04 22:17 ` Christoph Lameter
2008-11-04 22:35 ` Andrew Morton [this message]
2008-11-04 22:52 ` Christoph Lameter
2008-11-04 23:36 ` Andrew Morton
2008-11-05 1:31 ` KAMEZAWA Hiroyuki
2008-11-05 3:09 ` Andrew Morton
2008-11-05 2:45 ` Christoph Lameter
2008-11-05 3:05 ` Andrew Morton
2008-11-05 4:31 ` KAMEZAWA Hiroyuki
2008-11-10 9:02 ` Andrea Righi
2008-11-10 10:02 ` David Rientjes
2008-11-05 13:52 ` Christoph Lameter
2008-11-05 18:41 ` Andrew Morton
2008-11-05 20:21 ` Christoph Lameter
2008-11-05 20:31 ` Andrew Morton
2008-11-05 20:40 ` Christoph Lameter
2008-11-05 20:56 ` Andrew Morton
2008-11-05 21:28 ` Christoph Lameter
2008-11-05 21:55 ` Paul Menage
2008-11-05 22:04 ` David Rientjes
2008-11-06 1:34 ` KAMEZAWA Hiroyuki
2008-11-06 20:35 ` David Rientjes
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