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

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Date:	Fri, 19 Nov 2010 12:31:27 -0700
From:	Mike Galbraith <efault@....de>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	David Miller <davem@...emloft.net>, mzxreary@...inter.de,
	tytso@....edu, bgamari.foss@...il.com, a.p.zijlstra@...llo.nl,
	debiandev@...il.com, alan@...rguk.ukuu.org.uk,
	dhaval.giani@...il.com, vgoyal@...hat.com, oleg@...hat.com,
	markus@...ppelsdorf.de, mathieu.desnoyers@...icios.com,
	mingo@...e.hu, linux-kernel@...r.kernel.org,
	balbir@...ux.vnet.ibm.com
Subject: Re: [RFC/RFT PATCH v3] sched: automated per tty task groups

On Fri, 2010-11-19 at 09:51 -0800, Linus Torvalds wrote:

> And you really _can_ combine them. As mentioned, I'd be nervous about
> AIM benchmarks. I keep mentioning AIM, but that's because it has shown
> odd tty issues before. Back when the RT guys wanted to do that crazy
> blocking BKL thing (replace the spinlock with a semaphore), AIM7
> plummeted by 40%. And people were looking all over the place (file
> locking etc), and the tty layer was the biggest reason iirc.

If I were home, I'd have already checked out AIM7 and more, but I didn't
load laptop up with all my toys unfortunately.  (or fortunately, since
T130 ain't exactly a speed daemon)

	-Mike

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