linux-kernel - Re: [PATCH -V11 8/9] mm/vmscan: never demote for memcg reclaim

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Wed, 21 Jul 2021 17:59:26 -0400
From:   Zi Yan <ziy@...dia.com>
To:     Dave Hansen <dave.hansen@...el.com>
Cc:     Huang Ying <ying.huang@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Yang Shi <yang.shi@...ux.alibaba.com>,
        Yang Shi <shy828301@...il.com>, Michal Hocko <mhocko@...e.com>,
        Wei Xu <weixugc@...gle.com>,
        Oscar Salvador <osalvador@...e.de>,
        David Rientjes <rientjes@...gle.com>,
        Dan Williams <dan.j.williams@...el.com>,
        David Hildenbrand <david@...hat.com>,
        Greg Thelen <gthelen@...gle.com>,
        Keith Busch <kbusch@...nel.org>
Subject: Re: [PATCH -V11 8/9] mm/vmscan: never demote for memcg reclaim

On 21 Jul 2021, at 17:58, Dave Hansen wrote:

> On 7/21/21 2:38 PM, Zi Yan wrote:
>> On 21 Jul 2021, at 2:39, Huang Ying wrote:
>>> From: Dave Hansen <dave.hansen@...ux.intel.com>
>>>
>>> Global reclaim aims to reduce the amount of memory used on a
>>> given node or set of nodes.  Migrating pages to another node
>>> serves this purpose.
>>>
>>> memcg reclaim is different.  Its goal is to reduce the total
>>> memory consumption of the entire memcg, across all nodes.
>>> Migration does not assist memcg reclaim because it just moves
>>> page contents between nodes rather than actually reducing memory
>>> consumption.
> ...
>> Should this be folded into Patch 4 when can_demote() is
>> introduced?
>
> I guess it could be.  But, it's logically separate since it has its
> own justification which is rather discrete.
>
> I think it's best to keep it separate.

Sure. I am OK with it.

—
Best Regards,
Yan, Zi

Download attachment "signature.asc" of type "application/pgp-signature" (855 bytes)