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From: Tejun Heo <tj@kernel.org>
To: Michal Hocko <mhocko@suse.cz>
Cc: lizefan@huawei.com, containers@lists.linux-foundation.org,
	cgroups@vger.kernel.org, koverstreet@google.com,
	linux-kernel@vger.kernel.org, cl@linux-foundation.org,
	Mike Snitzer <snitzer@redhat.com>,
	Vivek Goyal <vgoyal@redhat.com>,
	"Alasdair G. Kergon" <agk@redhat.com>,
	Jens Axboe <axboe@kernel.dk>,
	Mikulas Patocka <mpatocka@redhat.com>,
	Glauber Costa <glommer@gmail.com>
Subject: Re: [PATCH 11/11] cgroup: use percpu refcnt for cgroup_subsys_states
Date: Mon, 17 Jun 2013 10:16:51 -0700	[thread overview]
Message-ID: <20130617171651.GE32663@mtj.dyndns.org> (raw)
In-Reply-To: <20130617132744.GB5018@dhcp22.suse.cz>

Hello, Michal.

On Mon, Jun 17, 2013 at 03:27:44PM +0200, Michal Hocko wrote:
> Thanks for your results! Yes the boost can be really high. I will try to
> measure some memcg workloads as soon as I have some spare cycles. I do
> not expect a big win but I also do not think this would regress.

With the just committed RCU-sched conversion, the slowdown even on
single CPU configuration w/ CONFIG_PREEMPT should be in the range of a
few percent points in the worst cases and will mostly be in the noise
in any realistic scenarios.  So, yeah, looks pretty good to me. :)

Thanks.

-- 
tejun

  reply	other threads:[~2013-06-17 17:16 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-06-13  4:04 [PATCHSET v2 cgroup/for-3.11] cgroup: convert cgroup_subsys_state refcnt to percpu_ref Tejun Heo
2013-06-13  4:04 ` [PATCH 01/11] cgroup: remove now unused css_depth() Tejun Heo
2013-06-13  4:04 ` [PATCH 02/11] cgroup: consistently use @cset for struct css_set variables Tejun Heo
2013-06-13  4:04 ` [PATCH 03/11] cgroup: bring some sanity to naming around cg_cgroup_link Tejun Heo
2013-06-13  4:04 ` [PATCH 04/11] cgroup: use kzalloc() instead of kmalloc() Tejun Heo
2013-06-13  4:04 ` [PATCH 05/11] cgroup: clean up css_[try]get() and css_put() Tejun Heo
2013-06-13  4:04 ` [PATCH 06/11] cgroup: rename CGRP_REMOVED to CGRP_DEAD Tejun Heo
2013-06-13  4:04 ` [PATCH 07/11] cgroup: drop unnecessary RCU dancing from __put_css_set() Tejun Heo
2013-06-13  4:04 ` [PATCH 08/11] cgroup: remove cgroup->count and use Tejun Heo
2013-06-13  4:04 ` [PATCH 09/11] cgroup: reorder the operations in cgroup_destroy_locked() Tejun Heo
2013-06-13  4:04 ` [PATCH 10/11] cgroup: split cgroup destruction into two steps Tejun Heo
2013-06-13  4:04 ` [PATCH 11/11] cgroup: use percpu refcnt for cgroup_subsys_states Tejun Heo
2013-06-13 23:16   ` Kent Overstreet
2013-06-14 12:55   ` Michal Hocko
2013-06-14 14:15     ` Glauber Costa
2013-06-14 14:22       ` Michal Hocko
2013-06-14 13:20   ` Michal Hocko
2013-06-14 22:31     ` Tejun Heo
2013-06-15  5:35       ` Tejun Heo
2013-06-15  5:39         ` Tejun Heo
2013-06-15  6:31         ` Tejun Heo
2013-06-17 13:27         ` Michal Hocko
2013-06-17 17:16           ` Tejun Heo [this message]
2013-06-13  6:04 ` [PATCHSET v2 cgroup/for-3.11] cgroup: convert cgroup_subsys_state refcnt to percpu_ref Li Zefan
2013-06-13 17:56   ` Tejun Heo
2013-06-14  2:41     ` Tejun Heo
  -- strict thread matches above, loose matches on Subject: below --
2013-06-12 21:03 [PATCHSET " Tejun Heo
2013-06-12 21:03 ` [PATCH 11/11] cgroup: use percpu refcnt for cgroup_subsys_states Tejun Heo

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