linux-kernel - Re: [PATCH] vmstat: on demand updates from differentials V7

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Message-ID: <20140603165526.GG23860@localhost.localdomain>
Date:	Tue, 3 Jun 2014 18:55:28 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Christoph Lameter <cl@...two.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Gilad Ben-Yossef <gilad@...yossef.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Tejun Heo <tj@...nel.org>, John Stultz <johnstul@...ibm.com>,
	Hakan Akkan <hakanakkan@...il.com>,
	Max Krasnyansky <maxk@...lcomm.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org, hughd@...gle.com,
	viresh.kumar@...aro.org, hpa@...or.com, mingo@...nel.org,
	peterz@...radead.org, Mike Frysinger <vapier@...too.org>,
	Minchan Kim <minchan.kim@...il.com>
Subject: Re: [PATCH] vmstat: on demand updates from differentials V7

On Tue, Jun 03, 2014 at 11:38:02AM -0500, Christoph Lameter wrote:
> On Tue, 3 Jun 2014, Frederic Weisbecker wrote:
> 
> > So after the cpumask_var_t conversion I have no other concern except
> 
> Is there some way to observe which worker threads are queued on which
> processor? I see nothing in /sys/devices/virtual/workqueues (urg should be
> /sys/kernel/workqueues) that shows that?

Yeah you can see that with workqueue tracing events.

Check out /sys/kernel/debug/tracing/events/workqueue/ and more specifically
workqueue_execute_start/ and workqueue_queue_work/.
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