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

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Message-ID: <p737ijqkcxw.fsf@bingen.suse.de>
Date:	Fri, 07 Dec 2007 11:37:47 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Stefano Brivio <stefano.brivio@...imi.it>,
	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>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Len Brown <lenb@...nel.org>
Subject: Re: [PATCH] scheduler: fix x86 regression in native_sched_clock

Thomas Gleixner <tglx@...utronix.de> writes:
>
> Hmrpf. sched_clock() is used for the time stamp of the printks. We
> need to find some better solution other than killing off the tsc
> access completely.

Doing it properly requires pretty much most of my old sched-clock ff patch.
Complicated and not pretty, but ..
Unfortunately that version still had some jumps on cpufreq, but they
are fixable there.

-Andi
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