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

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Message-ID: <CAJZ5v0gu7pfjNhzdO1x5D3coHzvZKepLBS=X4G0wjKVkhBxSGQ@mail.gmail.com>
Date:	Wed, 13 Jul 2016 15:22:58 +0200
From:	"Rafael J. Wysocki" <rafael@...nel.org>
To:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Cc:	"Rafael J. Wysocki" <rafael@...nel.org>,
	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>,
	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 <vaibhav.hiremath@...aro.org>,
	Alex Elder <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

On Wed, Jul 13, 2016 at 2:57 PM, Sergey Senozhatsky
<sergey.senozhatsky@...il.com> wrote:
> 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

Ah OK.  That should work for hibernation too.

> am I missing something?

No, I got confused for some reason.

Thanks,
Rafael