linux-kernel - Re: [PATCH] tracing/filters: allow on-the-fly filter switching

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Message-ID: <49E681B5.8070505@cn.fujitsu.com>
Date:	Thu, 16 Apr 2009 08:54:13 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
CC:	Tom Zanussi <tzanussi@...il.com>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>,
	paulmck@...ux.vnet.ibm.com
Subject: Re: [PATCH] tracing/filters: allow on-the-fly filter switching

Frederic Weisbecker wrote:
>>> Also, is filter_add_pred() supposed to be available for in-kernel
>>> uses by other tracers or something?
>> No, the current callers were the only ones I'd planned on (it's not
>> static because code in trace_events.c needs to call it).  But, do you
>> see a use for it by other tracers?
> 
> 
> 
> May be in the future, it's possible that a tracer might want to
> set filters by itself.
> But I don't think it has to be fixed now because there are nothing
> like that for now.
> 
> So, no problem :-)
> 

If we restricted the mutex in trace_events_filters.c only, all the
extern functions can be called without lock, and this is what I did
in my previous patch.

>  
>>> If this is planned, the locking could be even deeper than my comments.

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