linux-kernel - Re: [PATCH][GIT PULL] tracing: Fix compile issue for trace_sched

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Date:	Thu, 21 Oct 2010 09:22:24 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	Jason Baron <jbaron@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	2nddept-manager@....hitachi.co.jp
Subject: Re: [PATCH][GIT PULL] tracing: Fix compile issue for
 trace_sched_wakeup.c

On Thu, 2010-10-21 at 11:58 +0900, Masami Hiramatsu wrote:

> It seems there can be a bug in stop_machine() routine under
> heavy use. usually that is called just once at a time, but jump
> label and optprobe might call it heavily (thousands times?).
> So some racy situation can be happen easily.

There are people doing hotplug stress testing, that too results in heavy
stop_machine usage.

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