linux-kernel - Re: [RFC][PATCH 0/3] x86/nmi: Print all cpu stacks from NMI safely

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Message-ID: <20140619193635.1949b469@gandalf.local.home>
Date:	Thu, 19 Jun 2014 19:36:35 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Jiri Kosina <jkosina@...e.cz>
Cc:	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Michal Hocko <mhocko@...e.cz>, Jan Kara <jack@...e.cz>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Dave Anderson <anderson@...hat.com>,
	Petr Mladek <pmladek@...e.cz>
Subject: Re: [RFC][PATCH 0/3] x86/nmi: Print all cpu stacks from NMI safely

On Fri, 20 Jun 2014 01:27:26 +0200 (CEST)
Jiri Kosina <jkosina@...e.cz> wrote:

> 
> I don't think there is a need for a global stop_machine()-like 
> synchronization here. The printing CPU will be sending IPI to the CPU N+1 
> only after it has finished printing CPU N stacktrace.

So you plan on sending an IPI to a CPU then wait for it to acknowledge
that it is spinning, and then print out the data and then tell the CPU
it can stop spinning?

-- Steve
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