linux-kernel - Re: [PATCH 0/5] ftrace: to kill a daemon

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Message-Id: <200808111241.23686.rusty@rustcorp.com.au>
Date:	Mon, 11 Aug 2008 12:41:22 +1000
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	David Miller <davem@...emloft.net>,
	Roland McGrath <roland@...hat.com>,
	Ulrich Drepper <drepper@...hat.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Gregory Haskins <ghaskins@...ell.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	"Luis Claudio R. Goncalves" <lclaudio@...g.org>,
	Clark Williams <williams@...hat.com>
Subject: Re: [PATCH 0/5] ftrace: to kill a daemon

On Saturday 09 August 2008 04:41:06 Steven Rostedt wrote:
> On Fri, 8 Aug 2008, Mathieu Desnoyers wrote:
> > kstop_machine does not guarantee that you won't have _any_ thread
> > preempted with IP pointing exactly in the middle of your instructions
> > _before_ the modification scheduled back in _after_ the modification and
> > thus causing an illegal instruction.
> >
> > Still buggy. :/
>
> Hmm, good point. Unless...

You can walk the task list and fix them up, if you have to.  Of course, this 
could be extremely slow with a million threads.  Maybe just walking the 
runqueues would be sufficient?

Rusty.
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