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

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Date:	Tue, 18 Jan 2011 22:45:13 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Arnaldo Carvalho de Melo <acme@...hat.com>
Cc:	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,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>
Subject: Re: [PATCH -perf/perf/core 4/6] perf: Add strfilter for general	purpose
 string filter

(2011/01/18 1:39), Masami Hiramatsu wrote:
> (2011/01/17 21:55), Arnaldo Carvalho de Melo wrote:
>> Em Mon, Jan 17, 2011 at 10:40:29AM -0200, Arnaldo Carvalho de Melo escreveu:
>>> Em Thu, Jan 13, 2011 at 09:46:17PM +0900, Masami Hiramatsu escreveu:
>>>> Add strfilter for general purpose string filter.
>>>> Every filter rules are descrived by glob matching pattern
>>>> and '!' prefix which means Logical NOT.
>>>> A strfilter consists of those filter rules connected
>>>> with '&' and '|'. A set of rules can be folded by using
>>>> '(' and ')'. It also accepts spaces around rules and those
>>>
>>> You're not checking strfilter__alloc results, I'm fixing this for you
>>> this time :-)
>>
>> Not really, please check strdup() result and strfilter__delete() needs
>> to traverse all the nodes, not just the ones pointed at the root, right?
> 
> Would you mean that it should release all the node including
> ascendants? Hmm, I think we might just need to update its parent
> so that it doesn't get affected, because the strfilter__delete()
> doesn't know which user variable points the parent of the given node.
> E.g. If we remove "b*" from "(a* | b*)", just update it as "(a* | !*)"

Hmm, I changed my mind. I think this is more than enough.
It should be prohibited to pass the strfilter which is not
the tree root. So, I think current strfilter__delete() is enough, isn't it?

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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