From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
To: Glauber Costa <glommer@parallels.com>
Cc: cgroups@vger.kernel.org, Li Zefan <lizefan@huawei.com>,
Tejun Heo <tj@kernel.org>,
devel@openvz.org, Johannes Weiner <hannes@cmpxchg.org>,
Michal Hocko <mhocko@suse.cz>, Linux MM <linux-mm@kvack.org>,
Pavel Emelyanov <xemul@parallels.com>
Subject: Re: [RFC 5/7] use percpu_counters for res_counter usage
Date: Mon, 09 Apr 2012 10:48:42 +0900 [thread overview]
Message-ID: <4F823FFA.8000401@jp.fujitsu.com> (raw)
In-Reply-To: <4F75BACC.7050704@parallels.com>
(2012/03/30 22:53), Glauber Costa wrote:
> On 03/30/2012 11:58 AM, KAMEZAWA Hiroyuki wrote:
>> ==
>>
>> Now, we do consume 'reserved' usage, we can avoid css_get(), an heavy atomic
>> ops. You may need to move this code as
>>
>> rcu_read_lock()
>> ....
>> res_counter_charge()
>> if (failure) {
>> css_tryget()
>> rcu_read_unlock()
>> } else {
>> rcu_read_unlock()
>> return success;
>> }
>>
>> to compare performance. This css_get() affects performance very very much.
>
> thanks for the tip.
>
> But one thing:
>
> To be sure: it effectively mean that we are drawing from a dead memcg
> (because we pre-allocated, right?
Cached stock is consumed by the current task. It blocks removal of memcg.
It's not dead.
Thanks,
-Kame
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2012-04-09 1:50 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-30 8:04 [RFC 0/7] Initial proposal for faster res_counter updates Glauber Costa
2012-03-30 8:04 ` [RFC 1/7] split percpu_counter_sum Glauber Costa
2012-03-30 8:04 ` [RFC 2/7] consolidate all res_counter manipulation Glauber Costa
2012-03-30 8:04 ` [RFC 3/7] bundle a percpu counter into res_counters and use its lock Glauber Costa
2012-03-30 8:04 ` [RFC 4/7] move res_counter_set limit to res_counter.c Glauber Costa
2012-03-30 8:04 ` [RFC 5/7] use percpu_counters for res_counter usage Glauber Costa
2012-03-30 9:33 ` KAMEZAWA Hiroyuki
2012-03-30 9:58 ` KAMEZAWA Hiroyuki
2012-03-30 13:53 ` Glauber Costa
2012-04-09 1:48 ` KAMEZAWA Hiroyuki [this message]
2012-03-30 12:59 ` Glauber Costa
2012-03-30 8:04 ` [RFC 6/7] Add min and max statistics to percpu_counter Glauber Costa
2012-03-30 8:04 ` [RFC 7/7] Global optimization Glauber Costa
2012-03-30 8:32 ` [RFC 0/7] Initial proposal for faster res_counter updates KAMEZAWA Hiroyuki
2012-03-30 10:46 ` Glauber Costa
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4F823FFA.8000401@jp.fujitsu.com \
--to=kamezawa.hiroyu@jp.fujitsu.com \
--cc=cgroups@vger.kernel.org \
--cc=devel@openvz.org \
--cc=glommer@parallels.com \
--cc=hannes@cmpxchg.org \
--cc=linux-mm@kvack.org \
--cc=lizefan@huawei.com \
--cc=mhocko@suse.cz \
--cc=tj@kernel.org \
--cc=xemul@parallels.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox