linux-kernel - Re: [GIT PULL v2] bkl tracepoints + filter regex support

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Date:	Thu, 24 Sep 2009 22:33:22 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	LKML <linux-kernel@...r.kernel.org>,
	Tom Zanussi <tzanussi@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Li Zefan <lizf@...fujitsu.com>
Subject: Re: [GIT PULL v2] bkl tracepoints + filter regex support

On Thu, Sep 24, 2009 at 10:16:22PM +0200, Ingo Molnar wrote:
> 
> * Ingo Molnar <mingo@...e.hu> wrote:
> 
> > 
> > * Frederic Weisbecker <fweisbec@...il.com> wrote:
> > 
> > > Ingo,
> > > 
> > > This is new iteration of the bkl tracepoints + filter
> > > regex support. It addresses the reviews that were posted
> > > in the previous RFC version.
> > > 
> > > Please pull from:
> > > 
> > > git://git.kernel.org/pub/scm/linux/kernel/git/frederic/random-tracing.git
> > > 	tracing/core
> > > 
> > > Thanks;
> > > Frederic.
> > > 
> > > Frederic Weisbecker (5):
> > >       tracing/bkl: Add bkl ftrace events
> > >       tracing/filters: Cleanup useless headers
> > >       tracing/event: Cleanup the useless dentry variable
> > >       tracing/filters: Provide basic regex support
> > >       tracing/filters: Unify the regex parsing helpers
> > > 
> > >  include/linux/smp_lock.h           |   19 ++++-
> > >  include/trace/events/bkl.h         |   61 ++++++++++++++
> > >  kernel/trace/ftrace.c              |   64 +--------------
> > >  kernel/trace/trace.h               |   36 ++++++--
> > >  kernel/trace/trace_events.c        |   23 +++---
> > >  kernel/trace/trace_events_filter.c |  155 +++++++++++++++++++++++++++++++----
> > >  lib/kernel_lock.c                  |   11 ++-
> > >  7 files changed, 262 insertions(+), 107 deletions(-)
> > >  create mode 100644 include/trace/events/bkl.h
> > 
> > Pulled, thanks a lot Frederic! These bits look very useful.
> > 
> > It would be perf-ect now to complete the filters-via-perf-events changes 
> > Li Zefan is working on ;-)
> 
> There's one thing Peter noticed: this is not C syntax anymore. It would 
> be really nice to keep filter expressions a subset of C.
> 
> 	Ingo


You mean the use of stars for the regexes?
Hm, but that looks a intuitive way to define a regex string.
We can't stricly imitate the C without sticking into its
limitations. But it's still a subset of C with this feature.

Or I'm probably missing something?

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