linux-kernel - Re: [PATCH -perf/perf/core 4/6] perf: Add strfilter for general purpose string filter

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Message-ID: <4D2EFB8A.5050105@hitachi.com>
Date:	Thu, 13 Jan 2011 22:18:02 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Franck Bui-Huu <fbuihuu@...il.com>,
	linux-kernel@...r.kernel.org, 2nddept-manager@....hitachi.co.jp,
	Paul Mackerras <paulus@...ba.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Subject: Re: [PATCH -perf/perf/core 4/6] perf: Add strfilter for general purpose
 string filter

(2011/01/13 22:01), Peter Zijlstra wrote:
> On Thu, 2011-01-13 at 21:46 +0900, Masami Hiramatsu wrote:
>> Format:
>> <rule> ::= <glob-exp> | "!" <rule> | <rule> <op> <rule> | "(" <rule> ")"
>> <op> ::= "&" | "|"
>>
>> e.g.
>>  "(add* | del*) & *timer" filter rules pass strings which
>>  start with add or del and end with timer. 
> 
> Why not simply use regexps?

IMHO, regexp is usually too complex and too powerful just for
filtering and the combination of wild cards are simple and enough. :)
Moreover, if you'd like to filter with regexp, you just can use
"| grep" or "| egrep". ;)

(Of course, it is possible to expand this filter to support regexp by simply
 adding "~REGEXP" rule as ftrace does)

Thank you,

-- 
Masami HIRAMATSU
2nd Dept. Linux Technology Center
Hitachi, Ltd., Systems Development Laboratory
E-mail: masami.hiramatsu.pt@...achi.com
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