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Date: Fri, 07 Dec 2007 12:23:10 +0100 From: stefano.brivio@...imi.it To: Nick Piggin <nickpiggin@...oo.com.au> Cc: Ingo Molnar <mingo@...e.hu>, 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 Quoting Nick Piggin <nickpiggin@...oo.com.au>: > On Friday 07 December 2007 19:45, Ingo Molnar 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? I guess so. Definitely, it didn't look like a printk issue. Drivers don't read logs, usually. But they got confused anyway (it seems that udelay's get scaled or fail or somesuch - I can't test it right now, will provide more feedback in a few hours). -- Ciao Stefano -- 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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