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

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Date:	Sat, 3 Oct 2009 13:36:29 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>,
	Tom Zanussi <tzanussi@...il.com>,
	Li Zefan <lizf@...fujitsu.com>
Subject: Re: [GIT PULL v2] bkl tracepoints + filter regex support

On Sat, Sep 26, 2009 at 06:44:21AM -0400, Steven Rostedt wrote:
> 
> Perhaps when we put full perl regex into the kernel (my goal ;-) then we
> should look to keep different kinds of equals.
> 
>   ==  - is direct match. Only use of strcmp is needed.
> 
>   ~ - is globing. We can add a '*' which means match anything.
> 
> and if we do add true regex...
> 
>   =~ could be that.  field =~ '^spin.*{lock|unlock}$'


Ok.
I'm personnally fine with it.



> Perl is considered a much better language for regex. It has one of the
> most (if not the most) powerful regex engines. I'm sure recordmcount.pl
> would be much larger if I chose to do it in python. Same goes with
> streamline_config.pl.  They both have strong needs for complex regex.


Yeah, python was a joke. I mean I think it's a nice language
but not a syntax for what we want to do. It's an object oriented
language and I guess we don't want to do:

import re

r = re.compile("blah")
m = r.match("string")
m.group(1)
....

:-)


> > 
> > More seriously, as I said above, I think most developers are familiar with C
> > syntax, so IMHO this is one of our best possibility.
> > 
> 
> To avoid the Python vs Perl, I say we stick with sed/awk. That is also a
> requirement for most unix developers.


Yeah I'm fine with it. As long as this is something already familiar
for most users.

Let's then pick ~ for glob and ~= for regex

I'll fix that soon.

Thanks.

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