linux-kernel - Re: [PATCH v5 0/4] idle memory tracking

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Date:	Mon, 8 Jun 2015 12:35:35 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Raghavendra KT <raghavendra.kt@...ux.vnet.ibm.com>
Cc:	Vladimir Davydov <vdavydov@...allels.com>,
	Minchan Kim <minchan@...nel.org>,
	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 Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 0/4] idle memory tracking

On Sun, 7 Jun 2015 11:41:15 +0530 Raghavendra KT <raghavendra.kt@...ux.vnet.ibm.com> wrote:

> On Tue, May 12, 2015 at 7:04 PM, Vladimir Davydov
> <vdavydov@...allels.com> wrote:
> > Hi,
> >
> > This patch set introduces a new user API for tracking user memory pages
> > that have not been used for a given period of time. The purpose of this
> > is to provide the userspace with the means of tracking a workload's
> > working set, i.e. the set of pages that are actively used by the
> > workload. Knowing the working set size can be useful for partitioning
> > the system more efficiently, e.g. by tuning memory cgroup limits
> > appropriately, or for job placement within a compute cluster.
> >
> > ---- USE CASES ----
> >
> > The unified cgroup hierarchy has memory.low and memory.high knobs, which
> > are defined as the low and high boundaries for the workload working set
> > size. However, the working set size of a workload may be unknown or
> > change in time. With this patch set, one can periodically estimate the
> > amount of memory unused by each cgroup and tune their memory.low and
> > memory.high parameters accordingly, therefore optimizing the overall
> > memory utilization.
> >
> 
> Hi Vladimir,
> 
> Thanks for the patches, I was able test how the series is helpful to determine
> docker container workingset / idlemem with these patches. (tested on ppc64le
> after porting to a distro kernel).

And what were the results of your testing?  The more details the
better, please.

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