* Does function_graph support x86_32?
@ 2010-03-17 14:45 Ryan Wang
2010-03-18 0:56 ` Li Zefan
0 siblings, 1 reply; 3+ messages in thread
From: Ryan Wang @ 2010-03-17 14:45 UTC (permalink / raw)
To: linux-kernel
Does function_graph support x86_32?
thanks,
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Does function_graph support x86_32?
2010-03-17 14:45 Does function_graph support x86_32? Ryan Wang
@ 2010-03-18 0:56 ` Li Zefan
2010-03-20 3:00 ` Tim Bird
0 siblings, 1 reply; 3+ messages in thread
From: Li Zefan @ 2010-03-18 0:56 UTC (permalink / raw)
To: Ryan Wang; +Cc: linux-kernel
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
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Does function_graph support x86_32?
2010-03-18 0:56 ` Li Zefan
@ 2010-03-20 3:00 ` Tim Bird
0 siblings, 0 replies; 3+ messages in thread
From: Tim Bird @ 2010-03-20 3:00 UTC (permalink / raw)
To: Li Zefan; +Cc: Ryan Wang, linux-kernel@vger.kernel.org
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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2010-03-17 14:45 Does function_graph support x86_32? Ryan Wang
2010-03-18 0:56 ` Li Zefan
2010-03-20 3:00 ` Tim Bird
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