linux-kernel - Re: yield() in i2c non-happy paths hits BUG under -rt patch

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Message-ID: <1258636872.4372.354.camel@twins>
Date:	Thu, 19 Nov 2009 14:21:12 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Jean Delvare <khali@...ux-fr.org>,
	Leon Woestenberg <leon.woestenberg@...il.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Sven-Thorsten Dietrich <sven@...bigcorporation.com>,
	linux-i2c@...r.kernel.org,
	rt-users <linux-rt-users@...r.kernel.org>,
	"Ben Dooks (embedded platforms)" <ben-linux@...ff.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: yield() in i2c non-happy paths hits BUG under -rt patch

On Thu, 2009-11-19 at 14:11 +0100, Thomas Gleixner wrote:
> > You say "NOOP by default", does this imply there is a way to change
> > this?
> 
> There is a sysctl: sysctl_sched_compat_yield 

This makes yield() place current behind all other tasks, and sucks too
for some workloads.


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