From: Victor Porton <porton@narod.ru>
To: linux-kernel@vger.kernel.org
Subject: Notifying on empty cgroup
Date: Wed, 15 Jan 2014 06:12:45 +0200 [thread overview]
Message-ID: <135711389759165@web22h.yandex.ru> (raw)
I want to write software which needs to receive a signal when the cgroup
created by it becomes empty. (After this the empty cgroup should be deleted
just not to clutter the memory.)
If the kernel does not support such notifications, it should be improved.
This functionality is crucial for some kinds of software.
There is /sys/fs/cgroup/systemd/release_agent but I don't understand how to
use it. I don't understand why we would need it at all.
Starting a binary on emptying a cgroup with the purpose to notify an other
binary looks like a big overkill. Also my program should work in userspace
without the need to use release_agent which can be accessed only by root.
Note that my work is related with sandboxing software (running a program in
closed environment, so that it would be unable for example to remove user's
files).
See also
http://portonsoft.wordpress.com/2014/01/11/toward-robust-linux-sandbox/
--
Victor Porton - http://portonvictor.org
next reply other threads:[~2014-01-15 4:12 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-15 4:12 Victor Porton [this message]
2014-01-15 13:59 ` Michal Hocko
2014-01-15 14:11 ` Victor Porton
2014-01-15 15:12 ` Michal Hocko
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