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Message-ID: <68b6a7e92d48a3285a5707378459bb9ae805f333.camel@intel.com>
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(-)
>
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