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Message-ID: <18679.57954.270256.597333@cargo.ozlabs.ibm.com>
Date: Fri, 17 Oct 2008 11:54:58 +1100
From: Paul Mackerras <paulus@...ba.org>
To: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
linux-arch@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Thomas Gleixner <tglx@...utronix.de>,
David Miller <davem@...emloft.net>, benh@...nel.crashing.org,
Ingo Molnar <mingo@...hat.com>
Subject: Re: [RFC patch 04/15] get_cycles() : powerpc64 HAVE_GET_CYCLES
(update)
Mathieu Desnoyers writes:
> Do you know if mtfb implies an instruction synchronization (isync) ? I
It doesn't.
> think that if it does not, the new get_cycles_barrier() might have to be
> used at some locations in the kernel code if more precise timestamp
> order is required.
OK. I'll let you figure out where. :)
Paul.
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