linux-kernel - Re: [PATCH tracing/kprobes 4/7] tracing/kprobes: Add event profiling support

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Message-ID: <20090915045227.GA26458@in.ibm.com>
Date:	Tue, 15 Sep 2009 10:22:27 +0530
From:	Ananth N Mavinakayanahalli <ananth@...ibm.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Masami Hiramatsu <mhiramat@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...e.hu>,
	lkml <linux-kernel@...r.kernel.org>,
	systemtap <systemtap@...rces.redhat.com>,
	DLE <dle-develop@...ts.sourceforge.net>,
	Jim Keniston <jkenisto@...ibm.com>,
	Andi Kleen <ak@...ux.intel.com>,
	Christoph Hellwig <hch@...radead.org>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Jason Baron <jbaron@...hat.com>,
	"K.Prasad" <prasad@...ux.vnet.ibm.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Li Zefan <lizf@...fujitsu.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Tom Zanussi <tzanussi@...il.com>
Subject: Re: [PATCH tracing/kprobes 4/7] tracing/kprobes: Add event
	profiling support

On Mon, Sep 14, 2009 at 11:07:13PM +0200, Frederic Weisbecker wrote:
> On Mon, Sep 14, 2009 at 03:36:33PM -0400, Masami Hiramatsu wrote:
> > Frederic Weisbecker wrote:
> >> On Mon, Sep 14, 2009 at 12:54:24PM -0400, Masami Hiramatsu wrote:
> 
> 
> >> There might be some of such factors that would force you to handle a
> >> lot of corner cases, things that you wouldn't need to worry about
> >> if you just had to maintain a simple rcu list of probes to call.
> >
> >
> > Anyway, I never see who are using post_handler:). I'm not sure why
> > it is needed...
> 
> 
> May be it's a legacy of code that was used by the past, in which case
> that could perhaps be cleaned up?

No, kprobe post_handlers are used in various places, especially for
debug purposes. It is part of the ABI and should be retained.

Ananth
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