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

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Message-ID: <1290170336.3840.40.camel@maggy.simson.net>
Date:	Fri, 19 Nov 2010 05:38:56 -0700
From:	Mike Galbraith <efault@....de>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Samuel Thibault <samuel.thibault@...-lyon.org>,
	Hans-Peter Jansen <hpj@...la.net>,
	linux-kernel@...r.kernel.org,
	Lennart Poettering <mzxreary@...inter.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>, david@...g.hm,
	Dhaval Giani <dhaval.giani@...il.com>,
	Vivek Goyal <vgoyal@...hat.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Markus Trippelsdorf <markus@...ppelsdorf.de>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Ingo Molnar <mingo@...e.hu>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>
Subject: Re: [RFC/RFT PATCH v3] sched: automated per tty task groups

On Fri, 2010-11-19 at 12:49 +0100, Peter Zijlstra wrote:

> You add a lot of pointer chasing to all the scheduler fast paths and
> there is quite significant data size bloat for even compiling with the
> controller enabled, let alone actually using the stuff.

The pointer chasing hurts, but fast path + global spinlock is what
slapped the hierarchical outta me :)

	-Mike

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