From mboxrd@z Thu Jan  1 00:00:00 1970
From: Paul Mackerras <paulus@samba.org>
Subject: Re: [RFC patch 04/15] get_cycles() : powerpc64 HAVE_GET_CYCLES
	(update)
Date: Fri, 17 Oct 2008 11:54:58 +1100
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To: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Linus Torvalds <torvalds@linux-foundation.org>, Andrew Morton <akpm@linux-foundation.org>, Ingo Molnar <mingo@elte.hu>, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, Steven Rostedt <rostedt@goodmis.org>, Peter Zijlstra <a.p.zijlstra@chello.nl>, Thomas Gleixner <tglx@linutronix.de>, David Miller <davem@davemloft.net>, benh@kernel.crashing.org, Ingo Molnar <mingo@redhat.com>

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.