linux-kernel - Re: [RFC/RFT PATCH v3] sched: automated per tty task groups

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Message-ID: <20101122192106.GD15350@tango.0pointer.de>
Date:	Mon, 22 Nov 2010 20:21:06 +0100
From:	Lennart Poettering <mzxreary@...inter.de>
To:	Balbir Singh <balbir@...ux.vnet.ibm.com>
Cc:	Ben Gamari <bgamari.foss@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	David Miller <davem@...emloft.net>, tytso@....edu,
	a.p.zijlstra@...llo.nl, debiandev@...il.com,
	alan@...rguk.ukuu.org.uk, dhaval.giani@...il.com, efault@....de,
	vgoyal@...hat.com, oleg@...hat.com, markus@...ppelsdorf.de,
	mathieu.desnoyers@...icios.com, mingo@...e.hu,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC/RFT PATCH v3] sched: automated per tty task groups

On Mon, 22.11.10 11:54, Balbir Singh (balbir@...ux.vnet.ibm.com) wrote:

> 
> * Lennart Poettering <mzxreary@...inter.de> [2010-11-20 16:41:01]:
> 
> > On Sat, 20.11.10 09:55, Balbir Singh (balbir@...ux.vnet.ibm.com) wrote:
> > 
> > > > However, I am not sure I like the idea of having pollable files like that,
> > > > because in the systemd case I am very much interested in getting
> > > > recursive notifications, i.e. I want to register once for getting
> > > > notifications for a full subtree instead of having to register for each
> > > > cgroup individually.
> > > > 
> > > > My personal favourite solution would be to get a netlink msg when a
> > > > cgroup runs empty. That way multiple programs could listen to the events
> > > > at the same time, and we'd have an easy way to subscribe to a whole
> > > > hierarchy of groups.
> > > 
> > > The netlink message should not be hard to do if we agree to work on
> > > it. The largest objections I've heard is that netlink implies
> > > network programming and most users want to be able to script in
> > > their automation and network scripting is hard.
> > 
> > Well, the notify_on_release stuff cannot be dropped anyway at this point
> > in time, so netlink support would be an addition to, not a replacement for
> > the current stuff that might be useful for scripting folks.
> 
> Agreed, we still need the old notify_on_release. Are you suggesting
> that for scripting we use the old interface and newer tools use
> netlink?

No, the contrary. I was referring to "the current stuff that might be
useful for scripting and folks". And then netlink stuff would be for
everything beyond scripting, but not scripting itself.

Lennart

-- 
Lennart Poettering - Red Hat, Inc.
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