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

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Date:	Fri, 19 Nov 2010 14:00:48 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc:	Samuel Thibault <samuel.thibault@...-lyon.org>,
	Mike Galbraith <efault@....de>,
	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>,
	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 07:55 -0500, Mathieu Desnoyers wrote:
> 
> > In general though, I think you can say that: cgroups ass overhead.
> 
> I really think you meant "add" here ? (Hey! The keys were next to each other!)
> ;)

Uhm, quite!

> > Simply because you add constraints, this means you need to 1) account
> > more, 2) enforce constraints. Both have definite non-zero cost in both
> > data and time.
> 
> Yep, this looks like one of these perpetual throughput vs latency trade-offs.
> 
Trade-off sure, throughput vs latency only in a specific use-case, its
more a feature vs cost thing, just like all them trace people want lower
cost tracing but want more features at the same time..


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