linux-kernel - Re: Does function_graph support x86

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Message-ID: <4BA43A4A.4060607@am.sony.com>
Date:	Fri, 19 Mar 2010 20:00:26 -0700
From:	Tim Bird <tim.bird@...sony.com>
To:	Li Zefan <lizf@...fujitsu.com>
CC:	Ryan Wang <openspace.wang@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Does function_graph support x86_32?

On 03/17/2010 05:56 PM, Li Zefan wrote:
> Ryan Wang wrote:
>> Does function_graph support x86_32?
>>
> 
> Yes, but you need to disable CONFIG_CC_OPTIMIZE_FOR_SIZE
> 
> config FUNCTION_GRAPH_TRACER
>         bool "Kernel Function Graph Tracer"
>         depends on HAVE_FUNCTION_GRAPH_TRACER
>         depends on FUNCTION_TRACER
>         depends on !X86_32 || !CC_OPTIMIZE_FOR_SIZE

I've been bitten by this numerous times.  I most often
use ftrace on ARM, but when I go back to x86, I almost
always go through a sequence of searching for the
function graph tracer in the menus, then realizing it's
completely missing until I disable CC_OPTIMIZE_FOR_SIZE.

Is there any way to have the menu item appear, but be
unsettable unless the SIZE option is disabled?  I'm
not a Kconfig guru...
 -- Tim

=============================
Tim Bird
Architecture Group Chair, CE Linux Forum
Senior Staff Engineer, Sony Corporation of America
=============================

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