linux-kernel - Re: [PATCH -mm v8 0/7] idle memory tracking

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Date:	Thu, 16 Jul 2015 13:02:11 +0300
From:	Vladimir Davydov <vdavydov@...allels.com>
To:	Andres Lagar-Cavilla <andreslc@...gle.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Minchan Kim <minchan@...nel.org>,
	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...e.cz>,
	Greg Thelen <gthelen@...gle.com>,
	Michel Lespinasse <walken@...gle.com>,
	David Rientjes <rientjes@...gle.com>,
	Pavel Emelyanov <xemul@...allels.com>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	Jonathan Corbet <corbet@....net>, <linux-api@...r.kernel.org>,
	<linux-doc@...r.kernel.org>, <linux-mm@...ck.org>,
	<cgroups@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -mm v8 0/7] idle memory tracking

On Wed, Jul 15, 2015 at 01:47:15PM -0700, Andres Lagar-Cavilla wrote:
> I think the remaining question here is performance.
> 
> Have you conducted any studies where
> - there is a workload
> - a daemon is poking kpageidle every N seconds/minutes
> - what is the daemon cpu consumption?
> - what is the workload degradation if any?
> 
> N candidates include 30 seconds, 1 minute, 2 minutes, 5 minutes....
> 
> Workload candidates include TPC, spec int memory intensive things like
> 429.mcf, stream (http://www.cs.virginia.edu/stream/ "sustainable
> memory bandwidth" vs floating point performance)
> 
> I'm not asking for a research paper, but if, say, a 2 minute-period
> daemon introduces no degradation and adds up to a minute of cpu per
> hour, then we're golden.

Fair enough. Will do that soon and report back.

Thanks a lot for the review, it was really helpful!

Vladimir
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