From: Tejun Heo <tj@kernel.org>
To: Glauber Costa <glommer@parallels.com>
Cc: JoonSoo Kim <js1304@gmail.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
cgroups@vger.kernel.org, Mel Gorman <mgorman@suse.de>,
Andrew Morton <akpm@linux-foundation.org>,
Michal Hocko <mhocko@suse.cz>,
Johannes Weiner <hannes@cmpxchg.org>,
kamezawa.hiroyu@jp.fujitsu.com, Christoph Lameter <cl@linux.com>,
David Rientjes <rientjes@google.com>,
Pekka Enberg <penberg@kernel.org>,
devel@openvz.org, Pekka Enberg <penberg@cs.helsinki.fi>,
Suleiman Souhlal <suleiman@google.com>
Subject: Re: [PATCH v5 08/18] memcg: infrastructure to match an allocation to the right cache
Date: Thu, 25 Oct 2012 11:06:52 -0700 [thread overview]
Message-ID: <20121025180652.GM11442@htj.dyndns.org> (raw)
In-Reply-To: <50891CF2.3030400@parallels.com>
Hello, Glauber.
On Thu, Oct 25, 2012 at 03:05:22PM +0400, Glauber Costa wrote:
> > Is there any rmb() pair?
> > As far as I know, without rmb(), wmb() doesn't guarantee anything.
> >
>
> There should be. But it seems I missed it. Speaking of which, I should
You probably can use read_barrier_depends().
> wmb() after the NULL assignment in release cache as well.
And you probably don't need that. dangling pointer is protected by
RCU and there isn't any memory accesses which can paired with that
anyway.
Thanks.
--
tejun
WARNING: multiple messages have this Message-ID (diff)
From: Tejun Heo <tj@kernel.org>
To: Glauber Costa <glommer@parallels.com>
Cc: JoonSoo Kim <js1304@gmail.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
cgroups@vger.kernel.org, Mel Gorman <mgorman@suse.de>,
Andrew Morton <akpm@linux-foundation.org>,
Michal Hocko <mhocko@suse.cz>,
Johannes Weiner <hannes@cmpxchg.org>,
kamezawa.hiroyu@jp.fujitsu.com, Christoph Lameter <cl@linux.com>,
David Rientjes <rientjes@google.com>,
Pekka Enberg <penberg@kernel.org>,
devel@openvz.org, Pekka Enberg <penberg@cs.helsinki.fi>,
Suleiman Souhlal <suleiman@google.com>
Subject: Re: [PATCH v5 08/18] memcg: infrastructure to match an allocation to the right cache
Date: Thu, 25 Oct 2012 11:06:52 -0700 [thread overview]
Message-ID: <20121025180652.GM11442@htj.dyndns.org> (raw)
In-Reply-To: <50891CF2.3030400@parallels.com>
Hello, Glauber.
On Thu, Oct 25, 2012 at 03:05:22PM +0400, Glauber Costa wrote:
> > Is there any rmb() pair?
> > As far as I know, without rmb(), wmb() doesn't guarantee anything.
> >
>
> There should be. But it seems I missed it. Speaking of which, I should
You probably can use read_barrier_depends().
> wmb() after the NULL assignment in release cache as well.
And you probably don't need that. dangling pointer is protected by
RCU and there isn't any memory accesses which can paired with that
anyway.
Thanks.
--
tejun
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WARNING: multiple messages have this Message-ID (diff)
From: Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
To: Glauber Costa <glommer-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
Cc: JoonSoo Kim <js1304-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Mel Gorman <mgorman-l3A5Bk7waGM@public.gmane.org>,
Andrew Morton
<akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>,
Michal Hocko <mhocko-AlSwsSmVLrQ@public.gmane.org>,
Johannes Weiner <hannes-druUgvl0LCNAfugRpC6u6w@public.gmane.org>,
kamezawa.hiroyu-+CUm20s59erQFUHtdCDX3A@public.gmane.org,
Christoph Lameter <cl-vYTEC60ixJUAvxtiuMwx3w@public.gmane.org>,
David Rientjes <rientjes-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>,
Pekka Enberg <penberg-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
devel-GEFAQzZX7r8dnm+yROfE0A@public.gmane.org,
Pekka Enberg <penberg-bbCR+/B0CizivPeTLB3BmA@public.gmane.org>,
Suleiman Souhlal
<suleiman-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
Subject: Re: [PATCH v5 08/18] memcg: infrastructure to match an allocation to the right cache
Date: Thu, 25 Oct 2012 11:06:52 -0700 [thread overview]
Message-ID: <20121025180652.GM11442@htj.dyndns.org> (raw)
In-Reply-To: <50891CF2.3030400-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
Hello, Glauber.
On Thu, Oct 25, 2012 at 03:05:22PM +0400, Glauber Costa wrote:
> > Is there any rmb() pair?
> > As far as I know, without rmb(), wmb() doesn't guarantee anything.
> >
>
> There should be. But it seems I missed it. Speaking of which, I should
You probably can use read_barrier_depends().
> wmb() after the NULL assignment in release cache as well.
And you probably don't need that. dangling pointer is protected by
RCU and there isn't any memory accesses which can paired with that
anyway.
Thanks.
--
tejun
next prev parent reply other threads:[~2012-10-25 18:07 UTC|newest]
Thread overview: 132+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-19 14:20 [PATCH v5 00/18] slab accounting for memcg Glauber Costa
2012-10-19 14:20 ` Glauber Costa
2012-10-19 14:20 ` Glauber Costa
2012-10-19 14:20 ` [PATCH v5 01/18] move slabinfo processing to slab_common.c Glauber Costa
2012-10-19 14:20 ` Glauber Costa
2012-10-19 14:20 ` Glauber Costa
2012-10-24 6:43 ` Pekka Enberg
2012-10-24 6:43 ` Pekka Enberg
2012-10-24 6:43 ` Pekka Enberg
2012-10-19 14:20 ` [PATCH v5 02/18] move print_slabinfo_header " Glauber Costa
2012-10-19 14:20 ` Glauber Costa
2012-10-19 14:20 ` Glauber Costa
2012-10-19 14:20 ` [PATCH v5 03/18] sl[au]b: process slabinfo_show in common code Glauber Costa
2012-10-19 14:20 ` Glauber Costa
2012-10-19 14:20 ` Glauber Costa
2012-10-19 14:20 ` [PATCH v5 04/18] slab: don't preemptively remove element from list in cache destroy Glauber Costa
2012-10-19 14:20 ` Glauber Costa
2012-10-19 14:20 ` Glauber Costa
2012-10-19 19:34 ` Christoph Lameter
2012-10-19 19:34 ` Christoph Lameter
2012-10-19 19:34 ` Christoph Lameter
2012-10-22 8:40 ` Glauber Costa
2012-10-22 8:40 ` Glauber Costa
2012-10-22 8:40 ` Glauber Costa
2012-10-24 6:54 ` Pekka Enberg
2012-10-24 6:54 ` Pekka Enberg
2012-10-24 6:54 ` Pekka Enberg
2012-10-24 16:19 ` Glauber Costa
2012-10-24 16:19 ` Glauber Costa
2012-10-19 14:20 ` [PATCH v5 05/18] slab/slub: struct memcg_params Glauber Costa
2012-10-19 14:20 ` Glauber Costa
2012-10-19 14:20 ` Glauber Costa
2012-10-23 17:25 ` JoonSoo Kim
2012-10-23 17:25 ` JoonSoo Kim
2012-10-23 17:25 ` JoonSoo Kim
2012-10-24 8:42 ` Glauber Costa
2012-10-24 8:42 ` Glauber Costa
2012-10-19 14:20 ` [PATCH v5 06/18] consider a memcg parameter in kmem_create_cache Glauber Costa
2012-10-19 14:20 ` Glauber Costa
2012-10-19 14:20 ` Glauber Costa
2012-10-23 17:50 ` JoonSoo Kim
2012-10-23 17:50 ` JoonSoo Kim
2012-10-23 17:50 ` JoonSoo Kim
2012-10-24 8:42 ` Glauber Costa
2012-10-24 8:42 ` Glauber Costa
2012-10-24 8:42 ` Glauber Costa
2012-10-25 13:42 ` Glauber Costa
2012-10-25 13:42 ` Glauber Costa
2012-10-25 13:42 ` Glauber Costa
2012-10-19 14:20 ` [PATCH v5 07/18] Allocate memory for memcg caches whenever a new memcg appears Glauber Costa
2012-10-19 14:20 ` Glauber Costa
2012-10-19 14:20 ` Glauber Costa
2012-10-19 14:20 ` [PATCH v5 08/18] memcg: infrastructure to match an allocation to the right cache Glauber Costa
2012-10-19 14:20 ` Glauber Costa
2012-10-19 14:20 ` Glauber Costa
2012-10-24 18:10 ` JoonSoo Kim
2012-10-24 18:10 ` JoonSoo Kim
2012-10-25 11:05 ` Glauber Costa
2012-10-25 11:05 ` Glauber Costa
2012-10-25 11:05 ` Glauber Costa
2012-10-25 18:06 ` Tejun Heo [this message]
2012-10-25 18:06 ` Tejun Heo
2012-10-25 18:06 ` Tejun Heo
2012-10-25 18:08 ` Tejun Heo
2012-10-25 18:08 ` Tejun Heo
2012-10-19 14:20 ` [PATCH v5 09/18] memcg: skip memcg kmem allocations in specified code regions Glauber Costa
2012-10-19 14:20 ` Glauber Costa
2012-10-19 14:20 ` Glauber Costa
2012-10-19 14:20 ` [PATCH v5 10/18] sl[au]b: always get the cache from its page in kfree Glauber Costa
2012-10-19 14:20 ` Glauber Costa
2012-10-19 14:20 ` Glauber Costa
2012-10-19 19:44 ` Christoph Lameter
2012-10-19 19:44 ` Christoph Lameter
2012-10-19 19:44 ` Christoph Lameter
2012-10-22 10:13 ` Glauber Costa
2012-10-22 10:13 ` Glauber Costa
2012-10-22 10:13 ` Glauber Costa
2012-10-19 14:20 ` [PATCH v5 11/18] sl[au]b: Allocate objects from memcg cache Glauber Costa
2012-10-19 14:20 ` Glauber Costa
2012-10-19 14:20 ` Glauber Costa
2012-10-19 19:46 ` Christoph Lameter
2012-10-19 19:46 ` Christoph Lameter
2012-10-19 19:46 ` Christoph Lameter
2012-10-29 15:14 ` JoonSoo Kim
2012-10-29 15:14 ` JoonSoo Kim
2012-10-29 15:14 ` JoonSoo Kim
2012-10-29 15:19 ` Glauber Costa
2012-10-29 15:19 ` Glauber Costa
2012-10-29 15:19 ` Glauber Costa
2012-10-19 14:20 ` [PATCH v5 12/18] memcg: destroy memcg caches Glauber Costa
2012-10-19 14:20 ` Glauber Costa
2012-10-19 14:20 ` Glauber Costa
2012-10-19 14:20 ` [PATCH v5 13/18] memcg/sl[au]b Track all the memcg children of a kmem_cache Glauber Costa
2012-10-19 14:20 ` Glauber Costa
2012-10-19 14:20 ` Glauber Costa
2012-10-29 15:26 ` JoonSoo Kim
2012-10-29 15:26 ` JoonSoo Kim
2012-10-29 15:26 ` JoonSoo Kim
2012-10-30 11:31 ` Glauber Costa
2012-10-30 11:31 ` Glauber Costa
2012-10-30 11:31 ` Glauber Costa
2012-10-19 14:20 ` [PATCH v5 14/18] memcg/sl[au]b: shrink dead caches Glauber Costa
2012-10-19 14:20 ` Glauber Costa
2012-10-19 14:20 ` Glauber Costa
2012-10-19 19:47 ` Christoph Lameter
2012-10-19 19:47 ` Christoph Lameter
2012-10-19 19:47 ` Christoph Lameter
2012-10-22 7:37 ` Glauber Costa
2012-10-22 7:37 ` Glauber Costa
2012-10-22 7:37 ` Glauber Costa
2012-10-19 14:20 ` [PATCH v5 15/18] Aggregate memcg cache values in slabinfo Glauber Costa
2012-10-19 14:20 ` Glauber Costa
2012-10-19 14:20 ` Glauber Costa
2012-10-19 19:50 ` Christoph Lameter
2012-10-19 19:50 ` Christoph Lameter
2012-10-22 15:11 ` Glauber Costa
2012-10-22 15:11 ` Glauber Costa
2012-10-19 14:20 ` [PATCH v5 16/18] slab: propagate tunables values Glauber Costa
2012-10-19 14:20 ` Glauber Costa
2012-10-19 14:20 ` Glauber Costa
2012-10-19 19:51 ` Christoph Lameter
2012-10-19 19:51 ` Christoph Lameter
2012-10-22 7:48 ` Glauber Costa
2012-10-22 7:48 ` Glauber Costa
2012-10-23 20:44 ` Christoph Lameter
2012-10-23 20:44 ` Christoph Lameter
2012-10-19 14:20 ` [PATCH v5 17/18] slub: slub-specific propagation changes Glauber Costa
2012-10-19 14:20 ` Glauber Costa
2012-10-19 14:20 ` Glauber Costa
2012-10-19 14:20 ` [PATCH v5 18/18] Add slab-specific documentation about the kmem controller Glauber Costa
2012-10-19 14:20 ` Glauber Costa
2012-10-19 14:20 ` Glauber Costa
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