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

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Message-ID: <20090415015547.GJ5968@nowhere>
Date:	Wed, 15 Apr 2009 03:55:48 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Li Zefan <lizf@...fujitsu.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

On Wed, Apr 15, 2009 at 09:12:58AM +0800, Li Zefan wrote:
> > Ok, the whole design and concept looks nice.
> > 
> > But you really need to think about a locking scheme to protect
> > the filters from user files.
> > 
> 
> I noticed this and fixed it in that
> 	"[PATCH 7/7] tracing/filters: make filter preds RCU safe"
> 
> I'll try to fix it on top of Tom's on-the-fly filter swithcing,
> if Tom hasn't started to do this.


Ah, ok.

Thanks.

 
> > Also, is filter_add_pred() supposed to be available for in-kernel
> > uses by other tracers or something?
> > If this is planned, the locking could be even deeper than my comments.
> > 
> > Other than these comments:
> > 
> > Acked-by: Frederic Weisbecker <fweisbec@...il.com>
> > 
> > Thanks!

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