linux-kernel - Re: [RFC 0/4] tracing,x86_64 - function/graph trace without mcount/-pg/framepointer

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Message-ID: <1297114367.23343.3.camel@gandalf.stny.rr.com>
Date:	Mon, 07 Feb 2011 16:32:47 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Josh Triplett <josh@...htriplett.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [RFC 0/4] tracing,x86_64 - function/graph trace without
 mcount/-pg/framepointer

On Mon, 2011-02-07 at 13:22 -0800, Josh Triplett wrote:

> GCC 4.6 may help here.  According to
> http://gcc.gnu.org/gcc-4.6/changes.html:
> 
> "Support for emitting profiler counter calls before function prologues.
> This is enabled via a new command-line option -mfentry."
> 
> Looks like that option might only support x86 (32-bit and 64-bit) at the
> moment, but it still seems like an improvement over the current
> mechanism to work around GCC's placement of mcount.
> 

I may need to download this and try it out.

Thanks for the reference!

-- Steve


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