linux-kernel - Re: [RFC][PATCH] sched_clock

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Date:	Mon, 5 May 2008 13:32:31 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	David Miller <davem@...emloft.net>
Cc:	a.p.zijlstra@...llo.nl, tglx@...utronix.de, guichaz@...il.com,
	andi@...stfloor.org, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org, efault@....de,
	dhaval@...ux.vnet.ibm.com
Subject: Re: [RFC][PATCH] sched_clock_cpu()


* Ingo Molnar <mingo@...e.hu> wrote:

> 
> * David Miller <davem@...emloft.net> wrote:
> 
> > > that wont work very well when sched_clock() is called from within 
> > > CONFIG_LOCK_STAT instrumentation. Does the patch below solve the 
> > > boot problems for you?
> > 
> > Also, no platform can set HAVE_STABLE_CLOCK until we instantiate it in 
> > a Kconfig somewhere.  I've choosen to do it in kernel/Kconfig.hz and 
> > here are the sparc/sparc64 bits as well, I've booted this up with 
> > Peter's patch on my 64-cpu niagara2 box and done some basic testing.
> 
> applied, thanks David.
> 
> right now this topic looks good in review and in testing but it is 
> stalled on a bug: in overnight testing it triggered an ftrace 
> self-test hang that i bisected down to that patch. While that doesnt 
> affect mainline it's something that shows that the new sched_clock() 
> code is not as widely usable as the old code - have to investigate 
> that some more.

FYI, figured that out today and fixed it, so the topic has green lights 
again.

	Ingo
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