Re: [PATCH] scheduler: fix x86 regression in native_sched_clock

[Ingo Molnar <mingo@elte.hu>]

* Guillaume Chazarain <guichaz@yahoo.fr> wrote:

> Le Fri, 7 Dec 2007 15:54:18 +0100,
> Ingo Molnar <mingo@elte.hu> a écrit :
> 
> > This is a version that 
> > is supposed fix all known aspects of TSC and frequency-change 
> > weirdnesses.
> 
> Tested it with frequency changes, the clock is as smooth as I like it
> :-)

ok, great :-)

> The only remaining sched_clock user in need of conversion seems to be 
> lockdep.

yeah - for CONFIG_LOCKSTAT - but that needs to be done even more 
carefully, due to rq->lock being lockdep-checked. We can perhaps try a 
lock-less cpu_clock() version - other CPUs are not supposed to update 
rq->clock.

> Great work.

thanks. I do get the impression that most of this can/should wait until 
2.6.25. The patches look quite dangerous.

	Ingo