linux-kernel - Re: [PATCH tracing/kprobes] kprobes: Disable booster when CONFIG

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Message-ID: <20100128042139.GA29044@in.ibm.com>
Date:	Thu, 28 Jan 2010 09:51:39 +0530
From:	Ananth N Mavinakayanahalli <ananth@...ibm.com>
To:	Masami Hiramatsu <mhiramat@...hat.com>
Cc:	Ingo Molnar <mingo@...e.hu>, lkml <linux-kernel@...r.kernel.org>,
	systemtap <systemtap@...rces.redhat.com>,
	DLE <dle-develop@...ts.sourceforge.net>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jim Keniston <jkenisto@...ibm.com>,
	Mathieu Desnoyers <compudj@...stal.dyndns.org>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH tracing/kprobes] kprobes: Disable booster when
	CONFIG_PREEMPT=y

On Wed, Jan 27, 2010 at 04:55:31PM -0500, Masami Hiramatsu wrote:
> Disable kprobe booster when CONFIG_PREEMPT=y, because it can't ensure
> that all kernel threads preempted on kprobe's boosted slot run out from
> the slot even using freeze_processes().
> 
> The booster on preemptive kernel will be resumed if synchronize_tasks()
> or something like that is introduced.
> 
> Signed-off-by: Masami Hiramatsu <mhiramat@...hat.com>

Acked-by: Ananth N Mavinakayanahalli <ananth@...ibm.com>
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