linux-kernel - Re: [Query] Preemption (hogging) of the work handler

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Date:	Wed, 13 Jul 2016 21:57:04 +0900
From:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:	"Rafael J. Wysocki" <rafael@...nel.org>
Cc:	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Petr Mladek <pmladek@...e.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>, Jan Kara <jack@...e.cz>,
	Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
	Tejun Heo <tj@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	vlevenetz@...sol.com, vaibhav.hiremath@...aro.org,
	alex.elder@...aro.org, johan@...nel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Linux PM <linux-pm@...r.kernel.org>
Subject: Re: [Query] Preemption (hogging) of the work handler

Hello Rafael,

On (07/13/16 14:05), Rafael J. Wysocki wrote:
[..]
> > ah, just saw this. OK, very close to what I sent in another thread, so I
> > guess it will work on your side.
> > let me know if it doesn't, I'll fold it into 0001 and re-spin the series.
> > thanks for your help!
> 
> But you need to do an analogous thing for hibernation.  Essentially,
> wherever disable_nonboot_cpus() is called.

hibernation() suspends console, and suspend_console() forces printk to
switch to sync mode. resume_console() lets printk to operate in async
mode (if printk was configured to operate in async mode at all).

the patch I'm talking about is:
 http://marc.info/?l=linux-kernel&m=146838876027364&w=2

am I missing something?

	-ss