From: Joonsoo Kim <iamjoonsoo.kim@lge.com>
To: Christoph Lameter <cl@linux.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Johannes Weiner <hannes@cmpxchg.org>,
Michal Hocko <mhocko@suse.cz>, azurIt <azurit@pobox.sk>,
Linux Memory Management List <linux-mm@kvack.org>,
cgroups@vger.kernel.org, LKML <linux-kernel@vger.kernel.org>,
Christian Casteyde <casteyde.christian@free.fr>,
Pekka Enberg <penberg@kernel.org>
Subject: Re: [patch 2/2] fs: buffer: move allocation failure loop into the allocator
Date: Thu, 5 Dec 2013 17:44:41 +0900 [thread overview]
Message-ID: <20131205084441.GA5561@lge.com> (raw)
In-Reply-To: <00000142be753b07-aa0e2354-6704-41f8-8e11-3c856a186af5-000000@email.amazonses.com>
On Wed, Dec 04, 2013 at 04:33:43PM +0000, Christoph Lameter wrote:
> On Thu, 5 Dec 2013, Joonsoo Kim wrote:
>
> > Now we have cpu partial slabs facility, so I think that slowpath isn't really
> > slow. And it doesn't much increase the management overhead in the node
> > partial lists, because of cpu partial slabs.
>
> Well yes that may address some of the issues here.
>
> > And larger frame may cause more slab_lock contention or cmpxchg contention
> > if there are parallel freeings.
> >
> > But, I don't know which one is better. Is larger frame still better? :)
>
> Could you run some tests to figure this one out? There are also
> some situations in which we disable the per cpu partial pages though.
> F.e. for low latency/realtime. I posted in kernel synthetic
> benchmarks for slab a while back. That maybe something to start with.
I could try. But my trial would not figure this out, since my machine has
just 4 cores which normally cannot produce heavy contention.
Anyway, could you tell me where I can find your synthetic benchmarks for slab?
Thanks.
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next prev parent reply other threads:[~2013-12-05 8:42 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-08 20:58 [patch 1/2] mm: memcg: handle non-error OOM situations more gracefully Johannes Weiner
2013-10-08 20:58 ` [patch 2/2] fs: buffer: move allocation failure loop into the allocator Johannes Weiner
2013-10-11 20:51 ` Andrew Morton
2013-12-04 0:59 ` Andrew Morton
2013-12-04 1:52 ` Joonsoo Kim
2013-12-04 2:07 ` Andrew Morton
2013-12-04 2:42 ` Joonsoo Kim
2013-12-04 15:17 ` Christoph Lameter
2013-12-04 16:02 ` Joonsoo Kim
2013-12-04 16:33 ` Christoph Lameter
2013-12-05 8:44 ` Joonsoo Kim [this message]
2013-12-05 18:50 ` Christoph Lameter
2013-12-06 8:57 ` Joonsoo Kim
2013-12-13 6:58 ` Joonsoo Kim
2013-12-13 16:40 ` Christoph Lameter
2013-12-16 8:22 ` Joonsoo Kim
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