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

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Message-ID: <20160714221437.GF3057@ubuntu>
Date:	Thu, 14 Jul 2016 15:14:37 -0700
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Jan Kara <jack@...e.cz>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
	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, akpm@...ux-foundation.org,
	rostedt@...dmis.org, linux-pm@...r.kernel.org,
	Petr Mladek <pmladek@...e.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [Query] Preemption (hogging) of the work handler

On 14-07-16, 16:55, Jan Kara wrote:
> Agree on that - but that seems to be a problem of a particular wakeup
> implementation of the 3.10 kernel Viresh is using, not a problem of the
> upstream kernel.

I think we can get it to trigger on mainline as well. Also to mention that I
also don't see it on every suspend. Probably hrtimer_active() call returns true
in the sequence somewhere earlier, and we don't have to go activate a hrtimer.

-- 
viresh