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

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Message-ID: <CAC4Lta1isOa+OK7mqCDjL+aV1j=mXBA8p5xnrMEMj+jy6dRMaw@mail.gmail.com>
Date:	Sun, 7 Jun 2015 11:41:15 +0530
From:	Raghavendra KT <raghavendra.kt@...ux.vnet.ibm.com>
To:	Vladimir Davydov <vdavydov@...allels.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	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>,
	Raghavendra KT <raghavendra.kt@...ux.vnet.ibm.com>
Subject: Re: [PATCH v5 0/4] idle memory tracking

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).
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