From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: linuxppc-dev <linuxppc-dev@ozlabs.org>,
Andrew Morton <akpm@linux-foundation.org>,
Joerg Sommer <joerg@alea.gnuu.de>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH][GIT PULL] powerpc64/tracing: Add frame buffer to calls of trace_hardirqs_on/off
Date: Tue, 28 Dec 2010 08:38:37 +1100 [thread overview]
Message-ID: <1293485917.16694.821.camel@pasglop> (raw)
In-Reply-To: <1293311043.22802.434.camel@gandalf.stny.rr.com>
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.
prev parent reply other threads:[~2010-12-27 21:39 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-24 5:46 [PATCH][GIT PULL] powerpc64/tracing: Add frame buffer to calls of trace_hardirqs_on/off Steven Rostedt
2010-12-24 21:11 ` Benjamin Herrenschmidt
2010-12-25 21:04 ` Steven Rostedt
2010-12-27 21:38 ` Benjamin Herrenschmidt [this message]
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