linux-kernel - Re: [PATCH 0/2] unlikely profiler and tracer

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Message-ID: <20081112130714.GA24472@elte.hu>
Date:	Wed, 12 Nov 2008 14:07:14 +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>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Theodore Tso <tytso@....edu>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: [PATCH 0/2] unlikely profiler and tracer


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

> 
> On Wed, 12 Nov 2008, Ingo Molnar wrote:
> > * Steven Rostedt <rostedt@...dmis.org> wrote:
> > 
> > > Ingo,
> > > 
> > > The following patches are in:
> > > 
> > >   git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-2.6-trace.git
> > > 
> > >     branch: tip/devel
> > > 
> > > Steven Rostedt (2):
> > >       trace: profile likely and unlikely annotations
> > >       ftrace: unlikely annotation tracer
> > 
> > i've created a new topic branch for this tracer: 
> > tip/tracing/branch-tracer, and applied your patches to that branch. 
> 
> Good idea,
> 
> This profiler is very useful, but also very intrusive. I would like 
> it to get a broader audience for testing.

two more small details i noticed:

 - does it do proper self-test? It doesnt seem so at first sight.

 - i'd suggest a rename patch that does UNLIKELY_PROFILE => BRANCH_PROFILING.

    [ 'to profile' is the verb we use generally (it's a noun too but 
       we tend to use 'profiling' for that in other places of the
       kernel) - so we already have CONFIG_PROFILING, etc. ]

	Ingo
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