linux-kernel - Re: [PATCH 7/7] printk: Wake up klogd using irq

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Message-ID: <CAFTL4hzox08W_Uz6BP=7vM4Vq1ezHW0kMYG5br8fYAZ6E08Vig@mail.gmail.com>
Date:	Thu, 15 Nov 2012 16:33:44 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Paul Gortmaker <paul.gortmaker@...driver.com>
Subject: Re: [PATCH 7/7] printk: Wake up klogd using irq_work

2012/11/15 Frederic Weisbecker <fweisbec@...il.com>:
> ----->
> CPU that offilines                                          CPU offlining
> -----------------
> ---------------------
> cpu_down() {
>     __stop_machine(take_cpu_down)
>
> take_cpu_down() {
>
> __cpu_disable() {
>
>     * disable irqs in hw
>
>     * clear from online mask
>                                                                        }
>
> move all tasks somewhere
>                                                                    }
> while (!idle_cpu(offlining))
>     cpu_relax()
>
> cpu_die();
> <---------

Oh thanks gmail for the mess. Sometimes it mangles contents, sometimes
not. Probably depend if the moon is odd or even.

Here is a pastebin: http://pastebin.com/aACvyu6p
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