Re: [PATCH 1/2 v2][RFC] trace: profile likely and unlikelyannotations

[Arjan van de Ven]

On Wed, 29 Oct 2008 12:35:44 -0400 (EDT)
Steven Rostedt <rostedt@xxxxxxxxxxx> wrote:

> 
> Andrew Morton recently suggested having an in-kernel way to profile
> likely and unlikely macros. This patch achieves that goal.
> 
> When configured, every(*) likely and unlikely macro gets a counter
> attached to it. When the condition is hit, the hit and misses of that
> condition are recorded. These numbers can later be retrieved by:
> 
>   /debugfs/tracing/profile_likely    - All likely markers
>   /debugfs/tracing/profile_unlikely  - All unlikely markers.
> 

I like the general approach
it'd be very convenient if the debugfs files also had a
percentage-incorrect (or percentage-correct, either way) listed,
so that we humans can focus straight on which ones are outliers rather
than having to do math in our heads first...


-- 
Arjan van de Ven 	Intel Open Source Technology Centre
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