linux-kernel - Re: vmstat: On demand vmstat workers V3

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Message-ID: <alpine.DEB.2.10.1404231453410.16224@gentwo.org>
Date:	Wed, 23 Apr 2014 14:54:21 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Max Krasnyansky <maxk@....qualcomm.com>
cc:	Viresh Kumar <viresh.kumar@...aro.org>,
	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>,
	Mike Frysinger <vapier@...too.org>,
	Minchan Kim <minchan.kim@...il.com>,
	Hakan Akkan <hakanakkan@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-mm@...ck.org
Subject: Re: vmstat: On demand vmstat workers V3

On Wed, 23 Apr 2014, Max Krasnyansky wrote:

> The updates are done via the regular priority workqueue.

Yup so things could be fixed at that level with setting an additional
workqueue flag?

> I'm playing with isolation as well (has been more or less a background thing
> for the last 6+ years). Our threads that run on the isolated cores are SCHED_FIFO
> and therefor low prio workqueue stuff, like vmstat, doesn't get in the way.
> I do have a few patches for the workqueues to make things better for isolation.

Would you share those with us please?

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