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

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Date:	Wed, 23 Apr 2014 09:50:21 -0700
From:	Max Krasnyansky <maxk@....qualcomm.com>
To:	Viresh Kumar <viresh.kumar@...aro.org>,
	Christoph Lameter <cl@...ux.com>
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>,
	Mike Frysinger <vapier@...too.org>,
	Minchan Kim <minchan.kim@...il.com>,
	Hakan Akkan <hakanakkan@...il.com>,
	Max Krasnyansky <maxk@....qualcomm.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

Hi Viresh,

On 04/22/2014 03:32 AM, Viresh Kumar wrote:
> On Thu, Oct 3, 2013 at 11:10 PM, Christoph Lameter <cl@...ux.com> wrote:
>> V2->V3:
>> - Introduce a new tick_get_housekeeping_cpu() function. Not sure
>>   if that is exactly what we want but it is a start. Thomas?
>> - Migrate the shepherd task if the output of
>>   tick_get_housekeeping_cpu() changes.
>> - Fixes recommended by Andrew.
> 
> Hi Christoph,
> 
> This vmstat interrupt is disturbing my core isolation :), have you got
> any far with this patchset?

You don't mean an interrupt, right?
The updates are done via the regular priority workqueue.

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.

Max
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