linux-kernel - Re: [RFC][PATCH 4/5] tracing/filters: Provide basic regex support

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Date:	Mon, 03 Aug 2009 13:39:58 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
CC:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Tom Zanussi <tzanussi@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [RFC][PATCH 4/5] tracing/filters: Provide basic regex support

Frederic Weisbecker wrote:
> This patch provides basic support for regular expressions in filters.
> The common filter file doesn't support any regex but a new
> filter_regex file is created for each subsystem/event.
> 
> It supports the following types of regexp:
> 
> - *match_beginning
> - *match_middle*
> - match_end*
> - !don't match
> 

I don't see why adding "filter_regex" is necessary, why not just make
"filter" support regex?

> Every string is now handled as a regexp in the filter framework, which
> helps to factorize the code for handling both simple strings and
> regexp comparisons.
> 
> (The regexp code has been savagely cherry picked from ftrace.c
> writtent by Steve. If this patch makes its way, I'll be happy
> to change ftrace to use the new filter helpers)
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