linux-kernel - Re: [PATCH] perf: Avoid horrible stack usage

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Message-ID: <20141217154507.GA20471@krava.brq.redhat.com>
Date:	Wed, 17 Dec 2014 16:45:07 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	mingo@...nel.org, linux-kernel@...r.kernel.org,
	Frederic Weisbecker <fweisbec@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH] perf: Avoid horrible stack usage

On Wed, Dec 17, 2014 at 04:35:08PM +0100, Peter Zijlstra wrote:
> On Wed, Dec 17, 2014 at 03:31:05PM +0100, Jiri Olsa wrote:
> > looks like we could also sanitize the perf_ftrace_function_call
> > in the same way.. like below (untested)
> > 
> > hum, I just noticed it actually has pt_regs arg ;-)
> 
> Bu if it has pt_regs should we not use that instead of filling one out
> again?

yep, I talked to Steven about that and the thing is that
it's not guaranteed on all archs.. I'll send patch that
take that in account

jirka
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