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

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Date:	Tue, 12 Jul 2016 13:08:34 -0700
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	"Rafael J. Wysocki" <rafael@...nel.org>
Cc:	Petr Mladek <pmladek@...e.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
	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

On 12-07-16, 21:59, Rafael J. Wysocki wrote:
> It looks like a new printk() waits for a previous one to make progress
> and since progress cannot be made under the suspend conditions, it
> waits forever.

Thanks.

Maybe, but to mention this clearly again, this doesn't happen
every time. Sometime it takes 100 suspend/resume cycles to hit this
thing.

Lets see what Jan and Sergey have to say on this, as they were the
ones who wrote these patches :)

-- 
viresh