linux-kernel - Re: [PATCH] scheduler: fix x86 regression in native_sched

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Date:	Fri, 7 Dec 2007 12:17:20 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Nick Piggin <nickpiggin@...oo.com.au>
Cc:	Stefano Brivio <stefano.brivio@...imi.it>,
	Robert Love <rml@...h9.net>, linux-kernel@...r.kernel.org,
	Dave Jones <davej@...hat.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Michael Buesch <mb@...sch.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Len Brown <lenb@...nel.org>
Subject: Re: [PATCH] scheduler: fix x86 regression in native_sched_clock


* Nick Piggin <nickpiggin@...oo.com.au> wrote:

> > ah, printk_clock() still uses sched_clock(), not jiffies. So it's 
> > not the jiffies counter that goes back and forth, it's sched_clock() 
> > - so this is a printk timestamps anomaly, not related to jiffies. I 
> > thought we have fixed this bug in the printk code already: 
> > sched_clock() is a 'raw' interface that should not be used directly 
> > - the proper interface is cpu_clock(cpu).
> 
> It's a single CPU box, so sched_clock() jumping would still be 
> problematic, no?

sched_clock() is an internal API - the non-jumping API to be used by 
printk is cpu_clock().

	Ingo
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