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

Daniel Walker
2007-04-07T21:31:55Z

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?