linux-kernel - Re: [RFC PATCH 0/3] Cgroup accounting of memory tier usage

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Date:   Wed, 15 Jun 2022 12:58:50 +0800
From:   Ying Huang <ying.huang@...el.com>
To:     Tim Chen <tim.c.chen@...ux.intel.com>, linux-mm@...ck.org,
        akpm@...ux-foundation.org
Cc:     Wei Xu <weixugc@...gle.com>, Greg Thelen <gthelen@...gle.com>,
        Yang Shi <shy828301@...il.com>,
        Davidlohr Bueso <dave@...olabs.net>,
        Brice Goglin <brice.goglin@...il.com>,
        Michal Hocko <mhocko@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Hesham Almatary <hesham.almatary@...wei.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Alistair Popple <apopple@...dia.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Feng Tang <feng.tang@...el.com>,
        Jagdish Gediya <jvgediya@...ux.ibm.com>,
        Baolin Wang <baolin.wang@...ux.alibaba.com>,
        David Rientjes <rientjes@...gle.com>,
        "Aneesh Kumar K . V" <aneesh.kumar@...ux.ibm.com>,
        Shakeel Butt <shakeelb@...gle.com>
Subject: Re: [RFC PATCH 0/3] Cgroup accounting of memory tier usage

On Tue, 2022-06-14 at 15:25 -0700, Tim Chen wrote:
> For controlling usage of a top tiered memory by a cgroup, accounting
> of top tier memory usage is needed.  This patch set implements the
> following:
> 
> Patch 1 introduces interface and simple implementation to retrieve
> 	cgroup tiered memory usage
> Patch 2 introduces more efficient accounting with top tier memory page counter 
> Patch 3 provides a sysfs interface to repot the the top tiered memory
> 	usage.
> 
> The patchset works with Aneesh's v6 memory-tiering implementation [1].
> It is a preparatory patch set before introducing features to
> control top tiered memory in cgroups.
> 
> I'll like to first get feedback to see if 
> (1) Controllng the topmost tiered memory is enough 
> or
> (2) Multiple tiers at the top levels need to be grouped into "toptier"
> or

If we combine top-N tiers, I think the better name could be "fast-tier",
in contrast to "slow-tier".

> (3) There are use cases not covered by (1) and (2). 

Is it necessary to control memory usage of each tier (except the
lowest/slowest)?  I am not the right person to answer the question, but
I want to ask it.

Best Regards,
Huang, Ying

> Thanks.
> 
> Tim
> 
> [1] https://lore.kernel.org/linux-mm/20220610135229.182859-1-aneesh.kumar@linux.ibm.com/ 
> 
> Tim Chen (3):
>   mm/memory-tiers Add functions for tier memory usage in a cgroup
>   mm/memory-tiers: Use page counter to track toptier memory usage
>   mm/memory-tiers: Show toptier memory usage for cgroup
> 
>  include/linux/memcontrol.h   |  1 +
>  include/linux/memory-tiers.h |  2 +
>  mm/memcontrol.c              | 86 +++++++++++++++++++++++++++++++++++-
>  mm/memory-tiers.c            |  3 +-
>  4 files changed, 89 insertions(+), 3 deletions(-)
>