linux-kernel - Re: RFC vmstat: On demand vmstat threads

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Message-ID: <CAOtvUMdfqyg80_9J8AnOaAdahuRYGC-bpemdo_oucDBPguXbVA@mail.gmail.com>
Date:	Tue, 10 Sep 2013 09:15:24 +0300
From:	Gilad Ben-Yossef <gilad@...yossef.com>
To:	Christoph Lameter <cl@...ux.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	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@...lcomm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Linux-MM <linux-mm@...ck.org>
Subject: Re: RFC vmstat: On demand vmstat threads

On Wed, Sep 4, 2013 at 7:48 PM, Christoph Lameter <cl@...ux.com> wrote:
>
> vmstat threads are used for folding counter differentials into the
> zone, per node and global counters at certain time intervals.
>
> They currently run at defined intervals on all processors which will
> cause some holdoff for processors that need minimal intrusion by the
> OS.
>
> This patch creates a vmstat sheperd task that monitors the
> per cpu differentials on all processors. If there are differentials
> on a processor then a vmstat thread local to the processors with
> the differentials is created. That process will then start
> folding the diffs in regular intervals. Should the vmstat
> process find that there is no work to be done then it will
> terminate itself and make the sheperd task monitor the differentials
> again.
>

I wasn't happy with the results of my own attempt to accomplish the same and I
like this much better. So, for what it's worth -

Reviewed-by: Gilad Ben-Yossef <gilad@...yossef.com>

Thanks,
Gilad


-- 
Gilad Ben-Yossef
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gilad@...yossef.com
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