linux-kernel - Re: A Plumber’s Wish List for Linux

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Message-ID: <20111030171846.GD13286@tango.0pointer.de>
Date:	Sun, 30 Oct 2011 18:18:46 +0100
From:	Lennart Poettering <mzxreary@...inter.de>
To:	Li Zefan <lizf@...fujitsu.com>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Paul Menage <paul@...lmenage.org>,
	Kay Sievers <kay.sievers@...y.org>,
	linux-kernel@...r.kernel.org, harald@...hat.com, david@...ar.dk,
	greg@...ah.com
Subject: Re: A Plumber’s Wish List for Linux

On Tue, 25.10.11 13:40, Li Zefan (lizf@...fujitsu.com) wrote:

> > cgroups provides us with all of that, though the last two items only in
> > a suboptimal way: notification of cgroups running empty is ugly, since
> > it is done by spawning a usermode helper (we'd prefer a netlink msg or
> > so), and the process killing is a bit racy.
> 
> How about using eventfd? You can create an eventfd for the specific "tasks"
> file, and when the cgroup gets empty (no task in it), you'll get a notification.
> 
> It should be easy to implement, since cgroup already supports eventfd-based
> API.

I am quite convinced that using eventfd() like this is quite ugly. The
current evetnfd() logic is not recursive anyway, hence wouldn't help us
much.

Lennart

-- 
Lennart Poettering - Red Hat, Inc.
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