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SubjectRe: [patch 18/20] clean up tsc-based sched_clock
Andrew Morton wrote:
> On Wed, 04 Apr 2007 12:12:09 -0700 Jeremy Fitzhardinge <> wrote:
>> Three cleanups:
>> - change "instable" -> "unstable"
>> - its better to use get_cpu_var for getting this cpu's variables
>> - change cycles_2_ns to do the full computation rather than just the
>> tsc->ns scaling. Its a simpler interface, and it makes the function
>> more generally useful.
>> Signed-off-by: Jeremy Fitzhardinge <>
>> ---
>> arch/i386/kernel/sched-clock.c | 35 +++++++++++++++++++++--------------
> I'm dropping the relevant patch from Andi's tree due to it causing
> mysterious hangs when initscripts start ondemand. So I'll need to drop
> this patch and "[patch 19/20] Add a sched_clock paravirt_op".

OK. That just means we need to go back to the original "Add a
sched_clock paravirt_op" follow-on patch.

> I still need to work out why that hang is happening - it is very
> mysterious. I got as far as working out that it was hanging on
> write_seqlock_irqsave(xtime_lock), then remembered that it's with
> CONFIG_SMP=n so I stomped off to bed in disgust. Later.

Hangs always, or just sometimes? I haven't seen any problems with it.

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