linux-kernel - Re: [RFC GIT PULL] nohz: Kconfig layout improvements

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Date:	Thu, 4 Apr 2013 22:48:20 +0300
From:	Gilad Ben-Yossef <gilad@...yossef.com>
To:	Christoph Lameter <cl@...ux.com>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Chris Metcalf <cmetcalf@...era.com>,
	Geoff Levand <geoff@...radead.org>,
	Gilad Ben Yossef <gilad@...yossef.com>,
	Hakan Akkan <hakanakkan@...il.com>,
	Kevin Hilman <khilman@...aro.org>,
	Li Zhong <zhong@...ux.vnet.ibm.com>,
	Namhyung Kim <namhyung.kim@....com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Michal Marek <mmarek@...e.cz>
Subject: Re: [RFC GIT PULL] nohz: Kconfig layout improvements

Hi,

[ Sorry for dropping LKML on my previous email. It was caused by
replying from my smartphone. Adding everyone back now ]

On Thu, Apr 4, 2013 at 9:23 PM, Christoph Lameter <cl@...ux.com> wrote:
>
> On Thu, 4 Apr 2013, Gilad Ben-Yossef wrote:
>
> > The vmstat work item leaving a timer running on the CPU, perhaps?
>
> Of course there is always a timer running for VM work.
>
> > Check /proc/timers
>
> Not compiled in.
>
> > I've sent a patch previously to make vmstat disable the timer if no VM work
> > has been detected since the last run. Maybe you can try it? It was against
> > 3.4 though. Probably won't apply...
>
> Can you repost it? CC me on future postings. I wrote the vmstat handling.
>

Here is the last version I posted over a year ago. You were CCed and
provided very useful feedback:

http://lkml.indiana.edu/hypermail/linux/kernel/1205.0/01291.html

Based on your feedback I re-spun them but never gotten around to port
them to recent kernel and post them. The latest (yet unpublished
versions) are here:

https://github.com/gby/linux/commit/04e041327036772383c14ebdc450f522d782f264
https://github.com/gby/linux/commit/f5b8ae815670a289af9ff22ad83da3295472e63c

I'll try to resurrect them, but maybe they'll prove useful as a
reference as they are in the meantime.

Hope it helps,
Gilad


--
Gilad Ben-Yossef
Chief Coffee Drinker
gilad@...yossef.com
Israel Cell: +972-52-8260388
US Cell: +1-973-8260388
http://benyossef.com

"If you take a class in large-scale robotics, can you end up in a
situation where the homework eats your dog?"
 -- Jean-Baptiste Queru
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