Date: Mon, 8 Jun 2015 12:35:35 -0700
From: Andrew Morton <akpm@linux-foundation.org>
To: Raghavendra KT <raghavendra.kt@linux.vnet.ibm.com>
Cc: Vladimir Davydov <vdavydov@parallels.com>,
        Minchan Kim <minchan@kernel.org>, Johannes Weiner <hannes@cmpxchg.org>,
        Michal Hocko <mhocko@suse.cz>, Greg Thelen <gthelen@google.com>,
        Michel Lespinasse <walken@google.com>,
        David Rientjes <rientjes@google.com>,
        Pavel Emelyanov <xemul@parallels.com>,
        Cyrill Gorcunov <gorcunov@openvz.org>,
        Jonathan Corbet <corbet@lwn.net>, linux-api@vger.kernel.org,
        linux-doc@vger.kernel.org, linux-mm@kvack.org, cgroups@vger.kernel.org,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v5 0/4] idle memory tracking
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On Sun, 7 Jun 2015 11:41:15 +0530 Raghavendra KT <raghavendra.kt@linux.vnet.ibm.com> wrote:

> On Tue, May 12, 2015 at 7:04 PM, Vladimir Davydov
> <vdavydov@parallels.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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