From: Thomas Gleixner <tglx@linutronix.de>
To: Daniel Walker <dwalker@mvista.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org, johnstul@us.ibm.com, mingo@elte.hu
Subject: Re: [PATCH] timekeeping: drop irq-context clocksource polling
Date: Sat, 07 Apr 2007 22:50:19 +0200 [thread overview]
Message-ID: <1175979019.28263.523.camel@localhost.localdomain> (raw)
In-Reply-To: <1175967839.15973.156.camel@imap.mvista.com>
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.
tglx
next prev parent reply other threads:[~2007-04-07 20:49 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-04-05 21:03 [PATCH] timekeeping: drop irq-context clocksource polling Daniel Walker
2007-04-05 21:25 ` john stultz
2007-04-05 21:29 ` Daniel Walker
2007-04-05 21:38 ` john stultz
2007-04-05 21:36 ` Andrew Morton
2007-04-05 21:50 ` john stultz
2007-04-07 1:21 ` Andrew Morton
2007-04-07 2:04 ` Daniel Walker
2007-04-07 10:19 ` Andrew Morton
2007-04-07 17:43 ` Daniel Walker
2007-04-07 20:50 ` Thomas Gleixner [this message]
2007-04-07 21:30 ` Daniel Walker
2007-04-08 8:33 ` Thomas Gleixner
2007-04-08 20:02 ` Daniel Walker
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