linux-kernel - Re: [PATCH 0/3][RFC] tracing/kprobes: prevent jprobes from crashing function graph tracer

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Message-ID: <y0m4opfz5u6.fsf@fche.csb>
Date:	Sat, 31 Oct 2009 16:06:09 -0400
From:	fche@...hat.com (Frank Ch. Eigler)
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Li Zefan <lizf@...fujitsu.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	"David S. Miller" <davem@...emloft.net>,
	Stephen Hemminger <shemminger@...ux-foundation.org>
Subject: Re: [PATCH 0/3][RFC] tracing/kprobes: prevent jprobes from crashing function graph tracer

Steven Rostedt <rostedt@...dmis.org> writes:

> [...]  Jprobes and the function graph tracer use the same mechanism
> to trace the exit of a function. Unfortunately, only one can be done
> at a time.  The function graph tracer replaces the return address
> with its own handler, but so does jprobes. The two are not
> compatible. [...]

What about kretprobes?  It too uses the same mechanism.

- FChE
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