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

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Message-ID: <20101122062440.GF12043@balbir.in.ibm.com>
Date:	Mon, 22 Nov 2010 11:54:40 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Lennart Poettering <mzxreary@...inter.de>
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

* 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?

-- 
	Three Cheers,
	Balbir
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