linux-kernel - Re: [PATCH][GIT PULL] powerpc64/tracing: Add frame buffer to calls of trace_hardirqs

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Message-ID: <1293485917.16694.821.camel@pasglop>
Date:	Tue, 28 Dec 2010 08:38:37 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Joerg Sommer <joerg@...a.gnuu.de>,
	linuxppc-dev <linuxppc-dev@...abs.org>
Subject: Re: [PATCH][GIT PULL] powerpc64/tracing: Add frame buffer to calls
 of trace_hardirqs_on/off

On Sat, 2010-12-25 at 16:04 -0500, Steven Rostedt wrote:
> 
> Note, when CONFIG_IRQSOFF_TRACE is set, there's already a bit of
> overhead :-)
> 
> Anyway, I'll have to take a look at how the frame pointer is set up.
> Or
> we could also set up all stacks coming into the kernel to have a
> "dummy"
> frame pointer that wont hurt anything if we index into it.
> 
> Anyway, I'm off till the new year, so I'll worry about it then ;-)

Right, might be simpler to just make them loop back onto themselves or
something like that. I can have a look too if I get a chance.

Cheers,
Ben.

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