linux-kernel - Re: [PATCH] timekeeping: drop irq-context clocksource polling

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Date:	Sat, 07 Apr 2007 14:30:31 -0700
From:	Daniel Walker <dwalker@...sta.com>
To:	tglx@...utronix.de
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, johnstul@...ibm.com, mingo@...e.hu
Subject: Re: [PATCH] timekeeping: drop irq-context clocksource polling

On Sat, 2007-04-07 at 22:50 +0200, Thomas Gleixner wrote:
> On Sat, 2007-04-07 at 10:43 -0700, Daniel Walker wrote:
> > Looks like this path ,
> > 
> > arch/i386/kernel/tsc.c: time_cpufreq_notifier(); <-- takes xtime_lock
> > 			 mark_tsc_unstable();
> >             		  clocksource_change_rating(&clocksource_tsc, 0);
> > 			   timekeeping_change_clocksource(); <-- takes xtime_lock
> > 
> > 
> > I'm not sure why the time_cpufreq_notifier is taking the xtime_lock tho .
> 
> Simply because it fiddles with variables which are relevant for
> timekeeping.

loops_per_jiffy perhaps?



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