linux-kernel - Re: [PATCH tip/tracing/markers] new probes manager

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Message-ID: <18694.19224.210495.372922@cargo.ozlabs.ibm.com>
Date:	Tue, 28 Oct 2008 10:13:28 +1100
From:	Paul Mackerras <paulus@...ba.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Mathieu Desnoyers <compudj@...stal.dyndns.org>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH tip/tracing/markers] new probes manager

Ingo Molnar writes:

> yes, the statement that rmb() is very expensive looks dubious. It is 
> absolutely cheap everywhere.

On x86, maybe.  On powerpc it's as expensive as mb().

Paul.
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