linux-kernel - Re: [PATCH 4/4] trace: profile all if conditionals

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Date:	Sun, 23 Nov 2008 16:48:30 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Theodore Tso <tytso@....edu>,
	Arjan van de Ven <arjan@...radead.org>,
	Steven Rostedt <srostedt@...hat.com>
Subject: Re: [PATCH 4/4] trace: profile all if conditionals


* Steven Rostedt <rostedt@...dmis.org> wrote:

> From: Steven Rostedt <srostedt@...hat.com>
> 
> Impact: feature to profile if statements
> 
> This patch adds a branch profiler for all if () statements.
> The results will be found in:
> 
>   /debugfs/tracing/profile_branch
> 
> For example:
> 
>    miss      hit    %        Function                  File              Line
>  ------- ---------  -        --------                  ----              ----
>        0        1 100 x86_64_start_reservations      head64.c             127
>        0        1 100 copy_bootdata                  head64.c             69
>        1        0   0 x86_64_start_kernel            head64.c             111
>       32        0   0 set_intr_gate                  desc.h               319
>        1        0   0 reserve_ebda_region            head.c               51
>        1        0   0 reserve_ebda_region            head.c               47
>        0        1 100 reserve_ebda_region            head.c               42
>        0        0   X maxcpus                        main.c               165

-tip testing found this build failure:

 net/wireless/reg.c:348:29: error: macro "if" passed 2 arguments, but takes just 1

with the attached config. Seems the macro confused some aspect of WARN() 
?

	Ingo

View attachment "config" of type "text/plain" (68644 bytes)