linux-kernel - Re: [PATCH 1/7] ftrace, PPC: do not latency trace idle

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Message-ID: <18720.59484.266300.486911@drongo.ozlabs.ibm.com>
Date:	Mon, 17 Nov 2008 14:43:24 +1100
From:	Paul Mackerras <paulus@...ba.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	David Miller <davem@...emloft.net>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Pekka Paalanen <pq@....fi>, linuxppc-dev@...abs.org,
	Rusty Russell <rusty@...tcorp.com.au>,
	Paul Mundt <lethal@...ux-sh.org>,
	Steven Rostedt <srostedt@...hat.com>
Subject: Re: [PATCH 1/7] ftrace, PPC: do not latency trace idle

Steven Rostedt writes:

> When idle is called, interrupts are disabled, but the idle function
> will still wake up on an interrupt. The problem is that the interrupt
> disabled latency tracer will take this call to idle as a latency.
> 
> This patch disables the latency tracing when going into idle.

Patch looks OK, but what is the connection with ftrace?

Paul.
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