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From: Tejun Heo <tj@kernel.org>
To: Glauber Costa <glommer@parallels.com>
Cc: Michal Hocko <mhocko@suse.cz>,
	lizefan@huawei.com, hannes@cmpxchg.org, bsingharora@gmail.com,
	kamezawa.hiroyu@jp.fujitsu.com,
	containers@lists.linux-foundation.org, cgroups@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/8] cgroup: kill CSS_REMOVED
Date: Wed, 31 Oct 2012 10:44:20 -0700	[thread overview]
Message-ID: <20121031174420.GL2945@htj.dyndns.org> (raw)
In-Reply-To: <50916218.3090301@parallels.com>

Hello, Glauber.

On Wed, Oct 31, 2012 at 09:38:32PM +0400, Glauber Costa wrote:
> Because I am allocating an array big enough to hold one entry per memcg.
> The natural array index for this, is the css_id. Obviously, I don't want
> this array to have 65k entries in size, so I resize it (doubling every
> time) Because I don't know the css_id at this time, I have to do it later.
> 
> Another option for this - which I also considered - would be to use a
> different index. We get more packing, since not all memcgs will be kmem
> limited (and the index would contain only the kmem limited memcgs), and
> we can allocate this index during ->create().
> 
> I initially picked the css_index because I though a specialized index
> might be confusing. But if you feel strongly about all the allocations
> happening inside ->create(), this would be a way to avoid it. Would you
> prefer that?

I'll think more about it.  The whole css_id thing might need some soul
searching too anyway.  Let's continue this one your patch thread.

Thanks.

-- 
tejun

  reply	other threads:[~2012-10-31 17:44 UTC|newest]

Thread overview: 58+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-10-31  4:22 [PATCHSET] cgroup: simplify cgroup removal path Tejun Heo
2012-10-31  4:22 ` [PATCH 1/8] cgroup: kill cgroup_subsys->__DEPRECATED_clear_css_refs Tejun Heo
2012-10-31 13:21   ` Glauber Costa
2012-10-31 16:38     ` Tejun Heo
2012-10-31 14:37   ` Michal Hocko
2012-10-31 16:41     ` Tejun Heo
2012-10-31 16:48       ` Michal Hocko
2012-10-31 17:22         ` Tejun Heo
2012-11-02  9:23   ` Kamezawa Hiroyuki
2012-10-31  4:22 ` [PATCH 2/8] cgroup: kill CSS_REMOVED Tejun Heo
2012-10-31 15:39   ` Michal Hocko
2012-10-31 16:57     ` Tejun Heo
2012-10-31 17:06       ` Glauber Costa
2012-10-31 17:10         ` Tejun Heo
2012-10-31 17:19           ` Glauber Costa
2012-10-31 17:25             ` Tejun Heo
2012-10-31 17:38               ` Glauber Costa
2012-10-31 17:44                 ` Tejun Heo [this message]
2012-10-31 17:39               ` Glauber Costa
2012-10-31 19:16       ` Michal Hocko
2012-10-31 19:33         ` Tejun Heo
2012-11-02  9:30   ` Kamezawa Hiroyuki
2012-10-31  4:22 ` [PATCH 3/8] cgroup: use cgroup_lock_live_group(parent) in cgroup_create() Tejun Heo
2012-10-31 15:55   ` Michal Hocko
2012-10-31 17:04     ` Tejun Heo
2012-11-01  9:16       ` Michal Hocko
2012-11-01 14:52         ` Tejun Heo
2012-11-01 15:05           ` Michal Hocko
2012-11-01 15:15             ` Michal Hocko
2012-11-01 15:43               ` Tejun Heo
2012-11-02  9:37   ` Kamezawa Hiroyuki
2012-10-31  4:22 ` [PATCH 4/8] cgroup: deactivate CSS's and mark cgroup dead before invoking ->pre_destroy() Tejun Heo
2012-10-31 13:42   ` Glauber Costa
2012-10-31 16:05   ` Michal Hocko
2012-11-02  9:43   ` Kamezawa Hiroyuki
2012-10-31  4:22 ` [PATCH 5/8] cgroup: remove CGRP_WAIT_ON_RMDIR, cgroup_exclude_rmdir() and cgroup_release_and_wakeup_rmdir() Tejun Heo
2012-10-31 16:27   ` Michal Hocko
2012-10-31 17:16     ` Tejun Heo
2012-11-02  9:53   ` Kamezawa Hiroyuki
2012-10-31  4:22 ` [PATCH 6/8] memcg: make mem_cgroup_reparent_charges non failing Tejun Heo
2012-11-02  9:54   ` Kamezawa Hiroyuki
2012-10-31  4:22 ` [PATCH 7/8] hugetlb: do not fail in hugetlb_cgroup_pre_destroy Tejun Heo
2012-11-02  9:56   ` Kamezawa Hiroyuki
2012-10-31  4:22 ` [PATCH 8/8] cgroup: make ->pre_destroy() return void Tejun Heo
2012-10-31 13:57   ` Vivek Goyal
2012-10-31 16:28   ` Michal Hocko
2012-11-02  9:57   ` Kamezawa Hiroyuki
2012-10-31 13:49 ` [PATCHSET] cgroup: simplify cgroup removal path Glauber Costa
2012-10-31 17:18   ` Tejun Heo
2012-10-31 17:24     ` Glauber Costa
2012-10-31 17:26       ` Tejun Heo
2012-10-31 17:33         ` Glauber Costa
2012-10-31 16:31 ` Michal Hocko
2012-10-31 16:35   ` Tejun Heo
2012-10-31 18:16 [PATCHSET v2] " Tejun Heo
2012-10-31 18:16 ` [PATCH 2/8] cgroup: kill CSS_REMOVED Tejun Heo
2012-10-31 19:44 [PATCHSET RESEND v2] cgroup: simplify cgroup removal path Tejun Heo
2012-10-31 19:44 ` [PATCH 2/8] cgroup: kill CSS_REMOVED Tejun Heo
2012-11-02 10:02   ` Kamezawa Hiroyuki
2012-11-05  5:33   ` Li Zefan

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