linux-kernel - Re: RFC: How to handle function tracing, frame pointers and -mfentry?

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Message-ID: <20120428121631.GL27374@one.firstfloor.org>
Date:	Sat, 28 Apr 2012 14:16:31 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-kbuild <linux-kbuild@...r.kernel.org>,
	Michal Marek <mmarek@...e.cz>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: RFC: How to handle function tracing, frame pointers and -mfentry?

> "make defconfig" in my box calls gcc 50 times.
> This looks much closer to the actual usage of cc-option in the
> above mentioned files.
> How did you manage to achieve 144 calls to gcc?
> 
> Any specific configuration that triggers this?

Hmm, thanks for double checking. I suspect I misgrepped
(included the children of the gcc from the strace log). 
If it calls two children that would be roughly your number.

But even 50 is quite bad.

-Andi
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