From: Michal Hocko <mhocko@suse.cz>
To: Li Zefan <lizefan@huawei.com>
Cc: Tejun Heo <tj@kernel.org>,
Anton Vorontsov <anton.vorontsov@linaro.org>,
cgroups@vger.kernel.org, linux-mm@kvack.org,
Johannes Weiner <hannes@cmpxchg.org>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Subject: Re: [PATCH v2] vmpressure: make sure memcg stays alive until all users are signaled
Date: Fri, 12 Jul 2013 11:29:27 +0200 [thread overview]
Message-ID: <20130712092927.GA15307@dhcp22.suse.cz> (raw)
In-Reply-To: <51DFCA49.4080407@huawei.com>
On Fri 12-07-13 17:20:09, Li Zefan wrote:
[...]
> But if I read the code correctly, even no one registers a vmpressure event,
> vmpressure() is always running and queue the work item.
True but checking there is somebody is rather impractical. First we
would have to take a events_lock to check this and then drop it after
scheduling the work. Which doesn't guarantee that the registered event
wouldn't go away.
And even trickier, we would have to do the same for all parents up the
hierarchy.
--
Michal Hocko
SUSE Labs
--
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/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2013-07-12 9:29 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20130710184254.GA16979@mtj.dyndns.org>
[not found] ` <20130711083110.GC21667@dhcp22.suse.cz>
[not found] ` <51DE701C.6010800@huawei.com>
[not found] ` <20130711092542.GD21667@dhcp22.suse.cz>
[not found] ` <51DE7AAF.6070004@huawei.com>
2013-07-11 9:33 ` [PATCH v2] vmpressure: make sure memcg stays alive until all users are signaled Michal Hocko
2013-07-11 15:44 ` Tejun Heo
2013-07-11 16:22 ` Michal Hocko
2013-07-11 16:32 ` Tejun Heo
2013-07-12 8:40 ` Michal Hocko
2013-07-12 9:20 ` Li Zefan
2013-07-12 9:29 ` Michal Hocko [this message]
2013-07-12 9:54 ` Li Zefan
2013-07-12 10:37 ` Michal Hocko
2013-07-15 3:07 ` Li Zefan
2013-07-15 9:20 ` Michal Hocko
2013-07-15 9:53 ` Li Zefan
2013-07-12 9:24 ` [PATCH 1/3] vmpressure: document why css_get/put is not necessary for work queue based signaling Michal Hocko
2013-07-12 9:24 ` [PATCH 2/3] vmpressure: change vmpressure::sr_lock to spinlock Michal Hocko
2013-07-12 9:24 ` [PATCH 3/3] vmpressure: do not check for pending work to prevent from new work Michal Hocko
2013-07-12 18:48 ` [PATCH 1/3] vmpressure: document why css_get/put is not necessary for work queue based signaling Tejun Heo
2013-07-15 10:27 ` Michal Hocko
2013-07-12 18:34 ` [PATCH v2] vmpressure: make sure memcg stays alive until all users are signaled Tejun Heo
2013-07-12 18:40 ` Tejun Heo
2013-07-12 6:03 ` Li Zefan
2013-07-15 10:30 ` [PATCH v3 1/3] vmpressure: change vmpressure::sr_lock to spinlock Michal Hocko
2013-07-15 10:30 ` [PATCH v3 2/3] vmpressure: do not check for pending work to prevent from new work Michal Hocko
2013-07-15 10:30 ` [PATCH v3 3/3] vmpressure: Make sure there are no events queued after memcg is offlined Michal Hocko
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=20130712092927.GA15307@dhcp22.suse.cz \
--to=mhocko@suse.cz \
--cc=anton.vorontsov@linaro.org \
--cc=cgroups@vger.kernel.org \
--cc=hannes@cmpxchg.org \
--cc=kamezawa.hiroyu@jp.fujitsu.com \
--cc=kosaki.motohiro@jp.fujitsu.com \
--cc=linux-mm@kvack.org \
--cc=lizefan@huawei.com \
--cc=tj@kernel.org \
/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;
as well as URLs for NNTP newsgroup(s).