On Wed, Jul 25 2007, Ingo Molnar wrote:
>
> * Andrew Morton <[email protected]> wrote:
>
> > > * 2^30ns == 1.074s.
> > > */
> > > -static unsigned long get_timestamp(void)
> > > +static unsigned long get_timestamp(int this_cpu)
> > > {
> > > - return sched_clock() >> 30; /* 2^30 ~= 10^9 */
> > > + return cpu_clock(this_cpu) >> 30; /* 2^30 ~= 10^9 */
> > > }
> > >
> > > void touch_softlockup_watchdog(void)
> > > {
> > > - __raw_get_cpu_var(touch_timestamp) = get_timestamp();
> > > + int this_cpu = raw_smp_processor_id();
> > > +
> > > + per_cpu(touch_timestamp, this_cpu) = get_timestamp(this_cpu);
> > > }
> > > EXPORT_SYMBOL(touch_softlockup_watchdog);
> > >
> > > @@ -95,7 +97,7 @@ void softlockup_tick(void)
> > > return;
> >
> > argh. afacit this was never sent, except as part of some jumbopatch
> > called "sched: implement cpu_clock(cpu) high-speed time source".
> >
> > That patch helped.
> >
> > It's all a plot.
>
> sorry, it's really my fault: i decoupled it from the jumbopatch (so that
> the new API could go in first) but forgot to re-send that crutial bit.
> There's also the patch below (Jens Cc:-ed) to update blktrace. I guess i
> should do a softlockup.git tree to avoid such foul-ups in the future.
>
> Ingo
>
> ----------------------->
> Subject: blktrace: use cpu_clock() instead of sched_clock()
> From: Ingo Molnar <[email protected]>
>
> use cpu_clock() instead of sched_clock(). (the latter is not a proper
> clock-source)
>
> Signed-off-by: Ingo Molnar <[email protected]>
I tested it, seems to work fine for me.
Acked-by: Jens Axboe <[email protected]>
--
Jens Axboe
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