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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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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