From: Tejun Heo <tj@kernel.org>
To: Glauber Costa <glommer@parallels.com>
Cc: Mel Gorman <mgorman@suse.de>, Michal Hocko <mhocko@suse.cz>,
linux-kernel@vger.kernel.org, cgroups@vger.kernel.org,
kamezawa.hiroyu@jp.fujitsu.com, devel@openvz.org,
linux-mm@kvack.org, Suleiman Souhlal <suleiman@google.com>,
Frederic Weisbecker <fweisbec@gmail.com>,
David Rientjes <rientjes@google.com>,
Johannes Weiner <hannes@cmpxchg.org>
Subject: Re: [PATCH v3 04/13] kmem accounting basic infrastructure
Date: Sat, 6 Oct 2012 11:19:24 +0900 [thread overview]
Message-ID: <20121006021924.GB2601@localhost> (raw)
In-Reply-To: <506D7922.1050108@parallels.com>
Hello, Glauber.
On Thu, Oct 04, 2012 at 03:55:14PM +0400, Glauber Costa wrote:
> I don't want to bloat unrelated kmem_cache structures, so I can't embed
> a memcg array in there: I would have to have a pointer to a memcg array
> that gets assigned at first use. But if we don't want to have a static
> number, as you and christoph already frowned upon heavily, we may have
> to do that memcg side as well.
>
> The array gets bigger, though, because it pretty much has to be enough
> to accomodate all css_ids. Even now, they are more than the 400 I used
> in this patchset. Not allocating all of them at once will lead to more
> complication and pointer chasing in here.
I don't think it would require more pointer chasing. At the simplest,
we can just compare the array size each time. If you wanna be more
efficient, all arrays can be kept at the same size and resized when
the number of memcgs cross the current number. The only runtime
overhead would be one pointer deref which I don't think can be avoided
regardless of the indexing direction.
Thanks.
--
tejun
WARNING: multiple messages have this Message-ID (diff)
From: Tejun Heo <tj@kernel.org>
To: Glauber Costa <glommer@parallels.com>
Cc: Mel Gorman <mgorman@suse.de>, Michal Hocko <mhocko@suse.cz>,
linux-kernel@vger.kernel.org, cgroups@vger.kernel.org,
kamezawa.hiroyu@jp.fujitsu.com, devel@openvz.org,
linux-mm@kvack.org, Suleiman Souhlal <suleiman@google.com>,
Frederic Weisbecker <fweisbec@gmail.com>,
David Rientjes <rientjes@google.com>,
Johannes Weiner <hannes@cmpxchg.org>
Subject: Re: [PATCH v3 04/13] kmem accounting basic infrastructure
Date: Sat, 6 Oct 2012 11:19:24 +0900 [thread overview]
Message-ID: <20121006021924.GB2601@localhost> (raw)
In-Reply-To: <506D7922.1050108@parallels.com>
Hello, Glauber.
On Thu, Oct 04, 2012 at 03:55:14PM +0400, Glauber Costa wrote:
> I don't want to bloat unrelated kmem_cache structures, so I can't embed
> a memcg array in there: I would have to have a pointer to a memcg array
> that gets assigned at first use. But if we don't want to have a static
> number, as you and christoph already frowned upon heavily, we may have
> to do that memcg side as well.
>
> The array gets bigger, though, because it pretty much has to be enough
> to accomodate all css_ids. Even now, they are more than the 400 I used
> in this patchset. Not allocating all of them at once will lead to more
> complication and pointer chasing in here.
I don't think it would require more pointer chasing. At the simplest,
we can just compare the array size each time. If you wanna be more
efficient, all arrays can be kept at the same size and resized when
the number of memcgs cross the current number. The only runtime
overhead would be one pointer deref which I don't think can be avoided
regardless of the indexing direction.
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: Mel Gorman <mgorman-l3A5Bk7waGM@public.gmane.org>,
Michal Hocko <mhocko-AlSwsSmVLrQ@public.gmane.org>,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
kamezawa.hiroyu-+CUm20s59erQFUHtdCDX3A@public.gmane.org,
devel-GEFAQzZX7r8dnm+yROfE0A@public.gmane.org,
linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org,
Suleiman Souhlal
<suleiman-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>,
Frederic Weisbecker
<fweisbec-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
David Rientjes <rientjes-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>,
Johannes Weiner <hannes-druUgvl0LCNAfugRpC6u6w@public.gmane.org>
Subject: Re: [PATCH v3 04/13] kmem accounting basic infrastructure
Date: Sat, 6 Oct 2012 11:19:24 +0900 [thread overview]
Message-ID: <20121006021924.GB2601@localhost> (raw)
In-Reply-To: <506D7922.1050108-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
Hello, Glauber.
On Thu, Oct 04, 2012 at 03:55:14PM +0400, Glauber Costa wrote:
> I don't want to bloat unrelated kmem_cache structures, so I can't embed
> a memcg array in there: I would have to have a pointer to a memcg array
> that gets assigned at first use. But if we don't want to have a static
> number, as you and christoph already frowned upon heavily, we may have
> to do that memcg side as well.
>
> The array gets bigger, though, because it pretty much has to be enough
> to accomodate all css_ids. Even now, they are more than the 400 I used
> in this patchset. Not allocating all of them at once will lead to more
> complication and pointer chasing in here.
I don't think it would require more pointer chasing. At the simplest,
we can just compare the array size each time. If you wanna be more
efficient, all arrays can be kept at the same size and resized when
the number of memcgs cross the current number. The only runtime
overhead would be one pointer deref which I don't think can be avoided
regardless of the indexing direction.
Thanks.
--
tejun
next prev parent reply other threads:[~2012-10-06 2:19 UTC|newest]
Thread overview: 323+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-18 14:03 [PATCH v3 00/13] kmem controller for memcg Glauber Costa
2012-09-18 14:03 ` Glauber Costa
2012-09-18 14:03 ` Glauber Costa
2012-09-18 14:03 ` [PATCH v3 01/13] memcg: Make it possible to use the stock for more than one page Glauber Costa
2012-09-18 14:03 ` Glauber Costa
2012-09-18 14:03 ` Glauber Costa
2012-10-01 18:48 ` Johannes Weiner
2012-10-01 18:48 ` Johannes Weiner
2012-09-18 14:03 ` [PATCH v3 02/13] memcg: Reclaim when more than one page needed Glauber Costa
2012-09-18 14:03 ` Glauber Costa
2012-09-18 14:03 ` Glauber Costa
2012-10-01 19:00 ` Johannes Weiner
2012-10-01 19:00 ` Johannes Weiner
2012-09-18 14:04 ` [PATCH v3 03/13] memcg: change defines to an enum Glauber Costa
2012-09-18 14:04 ` Glauber Costa
2012-09-18 14:04 ` Glauber Costa
2012-10-01 19:06 ` Johannes Weiner
2012-10-01 19:06 ` Johannes Weiner
2012-10-01 19:06 ` Johannes Weiner
2012-10-02 9:10 ` Glauber Costa
2012-10-02 9:10 ` Glauber Costa
2012-09-18 14:04 ` [PATCH v3 04/13] kmem accounting basic infrastructure Glauber Costa
2012-09-18 14:04 ` Glauber Costa
2012-09-18 14:04 ` Glauber Costa
2012-09-21 16:34 ` Tejun Heo
2012-09-21 16:34 ` Tejun Heo
2012-09-24 8:09 ` Glauber Costa
2012-09-24 8:09 ` Glauber Costa
2012-09-24 8:09 ` Glauber Costa
2012-09-26 14:03 ` Michal Hocko
2012-09-26 14:03 ` Michal Hocko
2012-09-26 14:03 ` Michal Hocko
2012-09-26 14:33 ` Glauber Costa
2012-09-26 14:33 ` Glauber Costa
2012-09-26 16:01 ` Michal Hocko
2012-09-26 16:01 ` Michal Hocko
2012-09-26 16:01 ` Michal Hocko
2012-09-26 17:34 ` Glauber Costa
2012-09-26 17:34 ` Glauber Costa
2012-09-26 16:36 ` Tejun Heo
2012-09-26 16:36 ` Tejun Heo
2012-09-26 16:36 ` Tejun Heo
2012-09-26 17:36 ` Glauber Costa
2012-09-26 17:36 ` Glauber Costa
2012-09-26 17:44 ` Tejun Heo
2012-09-26 17:44 ` Tejun Heo
2012-09-26 17:44 ` Tejun Heo
2012-09-26 17:53 ` Glauber Costa
2012-09-26 17:53 ` Glauber Costa
2012-09-26 18:01 ` Tejun Heo
2012-09-26 18:01 ` Tejun Heo
2012-09-26 18:56 ` Glauber Costa
2012-09-26 18:56 ` Glauber Costa
2012-09-26 18:56 ` Glauber Costa
2012-09-26 19:34 ` Tejun Heo
2012-09-26 19:34 ` Tejun Heo
2012-09-26 19:34 ` Tejun Heo
2012-09-26 19:46 ` Glauber Costa
2012-09-26 19:46 ` Glauber Costa
2012-09-26 19:56 ` Tejun Heo
2012-09-26 19:56 ` Tejun Heo
2012-09-26 19:56 ` Tejun Heo
2012-09-26 20:02 ` Glauber Costa
2012-09-26 20:02 ` Glauber Costa
2012-09-26 20:16 ` Tejun Heo
2012-09-26 20:16 ` Tejun Heo
2012-09-26 20:16 ` Tejun Heo
2012-09-26 21:24 ` Glauber Costa
2012-09-26 21:24 ` Glauber Costa
2012-09-26 22:10 ` Tejun Heo
2012-09-26 22:10 ` Tejun Heo
2012-09-26 22:10 ` Tejun Heo
2012-09-26 22:29 ` Glauber Costa
2012-09-26 22:29 ` Glauber Costa
2012-09-26 22:42 ` Tejun Heo
2012-09-26 22:42 ` Tejun Heo
2012-09-26 22:42 ` Tejun Heo
2012-09-26 22:54 ` Glauber Costa
2012-09-26 22:54 ` Glauber Costa
2012-09-26 23:08 ` Tejun Heo
2012-09-26 23:08 ` Tejun Heo
2012-09-26 23:08 ` Tejun Heo
2012-09-26 23:20 ` Glauber Costa
2012-09-26 23:20 ` Glauber Costa
2012-09-26 23:33 ` Tejun Heo
2012-09-26 23:33 ` Tejun Heo
2012-09-27 12:15 ` Michal Hocko
2012-09-27 12:15 ` Michal Hocko
2012-09-27 12:15 ` Michal Hocko
2012-09-27 12:20 ` Glauber Costa
2012-09-27 12:20 ` Glauber Costa
2012-09-27 12:40 ` Michal Hocko
2012-09-27 12:40 ` Michal Hocko
2012-09-27 12:40 ` Michal Hocko
2012-09-27 12:40 ` Glauber Costa
2012-09-27 12:40 ` Glauber Costa
2012-09-27 12:40 ` Glauber Costa
2012-09-27 12:54 ` Michal Hocko
2012-09-27 12:54 ` Michal Hocko
2012-09-27 14:28 ` Mel Gorman
2012-09-27 14:28 ` Mel Gorman
2012-09-27 14:28 ` Mel Gorman
2012-09-27 14:49 ` Tejun Heo
2012-09-27 14:49 ` Tejun Heo
2012-09-27 14:57 ` Glauber Costa
2012-09-27 14:57 ` Glauber Costa
2012-09-27 17:46 ` Tejun Heo
2012-09-27 17:46 ` Tejun Heo
2012-09-27 17:46 ` Tejun Heo
2012-09-27 17:56 ` Michal Hocko
2012-09-27 17:56 ` Michal Hocko
2012-09-27 18:45 ` Glauber Costa
2012-09-27 18:45 ` Glauber Costa
2012-09-30 7:57 ` Tejun Heo
2012-09-30 7:57 ` Tejun Heo
2012-09-30 7:57 ` Tejun Heo
2012-09-30 8:02 ` Tejun Heo
2012-09-30 8:02 ` Tejun Heo
2012-09-30 8:56 ` James Bottomley
2012-09-30 8:56 ` James Bottomley
2012-09-30 8:56 ` James Bottomley
2012-09-30 10:37 ` Tejun Heo
2012-09-30 10:37 ` Tejun Heo
2012-09-30 10:37 ` Tejun Heo
2012-09-30 11:25 ` James Bottomley
2012-09-30 11:25 ` James Bottomley
2012-10-01 0:57 ` Tejun Heo
2012-10-01 0:57 ` Tejun Heo
2012-10-01 0:57 ` Tejun Heo
2012-10-01 8:43 ` Glauber Costa
2012-10-01 8:43 ` Glauber Costa
2012-10-01 8:46 ` Glauber Costa
2012-10-01 8:46 ` Glauber Costa
2012-10-03 22:59 ` Tejun Heo
2012-10-03 22:59 ` Tejun Heo
2012-10-01 8:36 ` Glauber Costa
2012-10-01 8:36 ` Glauber Costa
2012-09-27 12:08 ` Michal Hocko
2012-09-27 12:08 ` Michal Hocko
2012-09-27 12:08 ` Michal Hocko
2012-09-27 12:11 ` Glauber Costa
2012-09-27 12:11 ` Glauber Costa
2012-09-27 14:33 ` Tejun Heo
2012-09-27 14:33 ` Tejun Heo
2012-09-27 14:43 ` Mel Gorman
2012-09-27 14:43 ` Mel Gorman
2012-09-27 14:43 ` Mel Gorman
2012-09-27 14:58 ` Tejun Heo
2012-09-27 14:58 ` Tejun Heo
2012-09-27 18:30 ` Glauber Costa
2012-09-27 18:30 ` Glauber Costa
2012-09-30 8:23 ` Tejun Heo
2012-09-30 8:23 ` Tejun Heo
2012-10-01 8:45 ` Glauber Costa
2012-10-01 8:45 ` Glauber Costa
2012-10-03 22:54 ` Tejun Heo
2012-10-03 22:54 ` Tejun Heo
2012-10-04 11:55 ` Glauber Costa
2012-10-04 11:55 ` Glauber Costa
2012-10-06 2:19 ` Tejun Heo [this message]
2012-10-06 2:19 ` Tejun Heo
2012-10-06 2:19 ` Tejun Heo
2012-09-27 15:09 ` Michal Hocko
2012-09-27 15:09 ` Michal Hocko
2012-09-30 8:47 ` Tejun Heo
2012-09-30 8:47 ` Tejun Heo
2012-10-01 9:27 ` Michal Hocko
2012-10-01 9:27 ` Michal Hocko
2012-10-03 22:43 ` Tejun Heo
2012-10-03 22:43 ` Tejun Heo
2012-10-03 22:43 ` Tejun Heo
2012-10-05 13:47 ` Michal Hocko
2012-10-05 13:47 ` Michal Hocko
2012-10-05 13:47 ` Michal Hocko
2012-09-26 22:11 ` Johannes Weiner
2012-09-26 22:11 ` Johannes Weiner
2012-09-26 22:11 ` Johannes Weiner
2012-09-26 22:45 ` Glauber Costa
2012-09-26 22:45 ` Glauber Costa
2012-09-18 14:04 ` [PATCH v3 05/13] Add a __GFP_KMEMCG flag Glauber Costa
2012-09-18 14:04 ` Glauber Costa
2012-09-18 14:04 ` Glauber Costa
2012-09-18 14:15 ` Rik van Riel
2012-09-18 14:15 ` Rik van Riel
2012-09-18 15:06 ` Christoph Lameter
2012-09-18 15:06 ` Christoph Lameter
2012-09-18 15:06 ` Christoph Lameter
2012-09-19 7:39 ` Glauber Costa
2012-09-19 7:39 ` Glauber Costa
2012-09-19 7:39 ` Glauber Costa
2012-09-19 14:07 ` Christoph Lameter
2012-09-19 14:07 ` Christoph Lameter
2012-09-19 14:07 ` Christoph Lameter
2012-09-27 13:34 ` Mel Gorman
2012-09-27 13:34 ` Mel Gorman
2012-09-27 13:41 ` Glauber Costa
2012-09-27 13:41 ` Glauber Costa
2012-10-01 19:09 ` Johannes Weiner
2012-10-01 19:09 ` Johannes Weiner
2012-09-18 14:04 ` [PATCH v3 06/13] memcg: kmem controller infrastructure Glauber Costa
2012-09-18 14:04 ` Glauber Costa
2012-09-18 14:04 ` Glauber Costa
2012-09-20 16:05 ` JoonSoo Kim
2012-09-20 16:05 ` JoonSoo Kim
2012-09-20 16:05 ` JoonSoo Kim
2012-09-21 8:41 ` Glauber Costa
2012-09-21 8:41 ` Glauber Costa
2012-09-21 8:41 ` Glauber Costa
2012-09-21 9:14 ` JoonSoo Kim
2012-09-21 9:14 ` JoonSoo Kim
2012-09-26 15:51 ` Michal Hocko
2012-09-26 15:51 ` Michal Hocko
2012-09-26 15:51 ` Michal Hocko
2012-09-27 11:31 ` Glauber Costa
2012-09-27 11:31 ` Glauber Costa
2012-09-27 13:44 ` Michal Hocko
2012-09-27 13:44 ` Michal Hocko
2012-09-27 13:44 ` Michal Hocko
2012-09-28 11:34 ` Glauber Costa
2012-09-28 11:34 ` Glauber Costa
2012-09-28 11:34 ` Glauber Costa
2012-09-30 8:25 ` Tejun Heo
2012-09-30 8:25 ` Tejun Heo
2012-10-01 8:28 ` Glauber Costa
2012-10-01 8:28 ` Glauber Costa
2012-10-03 22:11 ` Tejun Heo
2012-10-03 22:11 ` Tejun Heo
2012-10-03 22:11 ` Tejun Heo
2012-10-01 9:44 ` Michal Hocko
2012-10-01 9:44 ` Michal Hocko
2012-10-01 9:44 ` Michal Hocko
2012-10-01 9:48 ` Michal Hocko
2012-10-01 9:48 ` Michal Hocko
2012-10-01 9:48 ` Michal Hocko
2012-10-01 10:09 ` Glauber Costa
2012-10-01 10:09 ` Glauber Costa
2012-10-01 11:51 ` Michal Hocko
2012-10-01 11:51 ` Michal Hocko
2012-10-01 11:51 ` Glauber Costa
2012-10-01 11:51 ` Glauber Costa
2012-10-01 11:51 ` Glauber Costa
2012-10-01 11:58 ` Michal Hocko
2012-10-01 11:58 ` Michal Hocko
2012-10-01 12:04 ` Glauber Costa
2012-10-01 12:04 ` Glauber Costa
2012-10-01 12:04 ` Glauber Costa
2012-09-18 14:04 ` [PATCH v3 07/13] mm: Allocate kernel pages to the right memcg Glauber Costa
2012-09-18 14:04 ` Glauber Costa
2012-09-18 14:04 ` Glauber Costa
2012-09-27 13:50 ` Mel Gorman
2012-09-27 13:50 ` Mel Gorman
2012-09-28 9:43 ` Glauber Costa
2012-09-28 9:43 ` Glauber Costa
2012-09-28 9:43 ` Glauber Costa
2012-09-28 13:28 ` Mel Gorman
2012-09-28 13:28 ` Mel Gorman
2012-09-27 13:52 ` Michal Hocko
2012-09-27 13:52 ` Michal Hocko
2012-09-27 13:52 ` Michal Hocko
2012-09-18 14:04 ` [PATCH v3 08/13] res_counter: return amount of charges after res_counter_uncharge Glauber Costa
2012-09-18 14:04 ` Glauber Costa
2012-09-18 14:04 ` Glauber Costa
2012-10-01 10:00 ` Michal Hocko
2012-10-01 10:00 ` Michal Hocko
2012-10-01 10:01 ` Glauber Costa
2012-10-01 10:01 ` Glauber Costa
2012-09-18 14:04 ` [PATCH v3 09/13] memcg: kmem accounting lifecycle management Glauber Costa
2012-09-18 14:04 ` Glauber Costa
2012-09-18 14:04 ` Glauber Costa
2012-10-01 12:15 ` Michal Hocko
2012-10-01 12:15 ` Michal Hocko
2012-10-01 12:15 ` Michal Hocko
2012-10-01 12:29 ` Glauber Costa
2012-10-01 12:29 ` Glauber Costa
2012-10-01 12:29 ` Glauber Costa
2012-10-01 12:36 ` Michal Hocko
2012-10-01 12:36 ` Michal Hocko
2012-10-01 12:36 ` Michal Hocko
2012-10-01 12:43 ` Glauber Costa
2012-10-01 12:43 ` Glauber Costa
2012-10-01 12:43 ` Glauber Costa
2012-09-18 14:04 ` [PATCH v3 10/13] memcg: use static branches when code not in use Glauber Costa
2012-09-18 14:04 ` Glauber Costa
2012-09-18 14:04 ` Glauber Costa
2012-10-01 12:25 ` Michal Hocko
2012-10-01 12:25 ` Michal Hocko
2012-10-01 12:27 ` Glauber Costa
2012-10-01 12:27 ` Glauber Costa
2012-10-01 12:27 ` Glauber Costa
2012-09-18 14:04 ` [PATCH v3 11/13] memcg: allow a memcg with kmem charges to be destructed Glauber Costa
2012-09-18 14:04 ` Glauber Costa
2012-09-18 14:04 ` Glauber Costa
2012-10-01 12:30 ` Michal Hocko
2012-10-01 12:30 ` Michal Hocko
2012-10-01 12:30 ` Michal Hocko
2012-09-18 14:04 ` [PATCH v3 12/13] execute the whole memcg freeing in rcu callback Glauber Costa
2012-09-18 14:04 ` Glauber Costa
2012-09-18 14:04 ` Glauber Costa
2012-09-21 17:23 ` Tejun Heo
2012-09-21 17:23 ` Tejun Heo
2012-09-21 17:23 ` Tejun Heo
2012-09-24 8:48 ` Glauber Costa
2012-09-24 8:48 ` Glauber Costa
2012-09-24 8:48 ` Glauber Costa
2012-10-01 13:27 ` Michal Hocko
2012-10-01 13:27 ` Michal Hocko
2012-10-01 13:27 ` Michal Hocko
2012-10-04 10:53 ` Glauber Costa
2012-10-04 10:53 ` Glauber Costa
2012-10-04 10:53 ` Glauber Costa
2012-10-04 14:20 ` Glauber Costa
2012-10-04 14:20 ` Glauber Costa
2012-10-05 15:31 ` Johannes Weiner
2012-10-05 15:31 ` Johannes Weiner
2012-10-05 15:31 ` Johannes Weiner
2012-10-08 9:45 ` Glauber Costa
2012-10-08 9:45 ` Glauber Costa
2012-09-18 14:04 ` [PATCH v3 13/13] protect architectures where THREAD_SIZE >= PAGE_SIZE against fork bombs Glauber Costa
2012-09-18 14:04 ` Glauber Costa
2012-09-18 14:04 ` Glauber Costa
2012-10-01 13:17 ` Michal Hocko
2012-10-01 13:17 ` Michal Hocko
2012-10-01 13:17 ` Michal Hocko
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