From: Dave Hansen <dave.hansen@intel.com>
To: Zi Yan <ziy@nvidia.com>, Huang Ying <ying.huang@intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Dave Hansen <dave.hansen@linux.intel.com>,
Yang Shi <yang.shi@linux.alibaba.com>,
Yang Shi <shy828301@gmail.com>, Michal Hocko <mhocko@suse.com>,
Wei Xu <weixugc@google.com>, Oscar Salvador <osalvador@suse.de>,
David Rientjes <rientjes@google.com>,
Dan Williams <dan.j.williams@intel.com>,
David Hildenbrand <david@redhat.com>,
Greg Thelen <gthelen@google.com>, Keith Busch <kbusch@kernel.org>
Subject: Re: [PATCH -V11 8/9] mm/vmscan: never demote for memcg reclaim
Date: Wed, 21 Jul 2021 14:58:05 -0700 [thread overview]
Message-ID: <59a92898-4a8a-05d3-5f75-1f8defb6feda@intel.com> (raw)
In-Reply-To: <43A1CB83-6127-427F-94AF-40CE1B283BE1@nvidia.com>
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@linux.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.
next prev parent reply other threads:[~2021-07-21 21:58 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-21 6:39 [PATCH -V11 1/9] mm/numa: automatically generate node migration order Huang Ying
2021-07-21 6:39 ` [PATCH -V11 2/9] mm/migrate: update node demotion order on hotplug events Huang Ying
2022-02-23 23:02 ` Abhishek Goel
2022-02-24 0:05 ` Dave Hansen
2022-02-24 23:37 ` Abhishek Goel
2022-02-25 0:49 ` Dave Hansen
2022-02-25 2:32 ` Huang, Ying
2022-02-25 20:35 ` Abhishek Goel
2022-03-08 10:27 ` Oscar Salvador
2022-03-08 17:07 ` Dave Hansen
2022-03-08 18:56 ` Oscar Salvador
2022-03-09 0:29 ` Huang, Ying
2021-07-21 6:39 ` [PATCH -V11 3/9] mm/migrate: enable returning precise migrate_pages() success count Huang Ying
2021-07-21 6:39 ` [PATCH -V11 4/9] mm/migrate: demote pages during reclaim Huang Ying
2021-07-21 21:11 ` Zi Yan
2021-07-21 6:39 ` [PATCH -V11 5/9] mm/vmscan: add page demotion counter Huang Ying
2021-07-21 21:13 ` Zi Yan
2021-07-21 6:39 ` [PATCH -V11 6/9] mm/vmscan: add helper for querying ability to age anonymous pages Huang Ying
2021-07-21 21:15 ` Zi Yan
2021-07-21 6:39 ` [PATCH -V11 7/9] mm/vmscan: Consider anonymous pages without swap Huang Ying
2021-07-21 21:21 ` Zi Yan
2021-07-21 6:39 ` [PATCH -V11 8/9] mm/vmscan: never demote for memcg reclaim Huang Ying
2021-07-21 21:38 ` Zi Yan
2021-07-21 21:58 ` Dave Hansen [this message]
2021-07-21 21:59 ` Zi Yan
2021-07-21 22:03 ` Yang Shi
2021-07-21 22:03 ` Yang Shi
2021-07-21 6:39 ` [PATCH -V11 9/9] mm/migrate: add sysfs interface to enable reclaim migration Huang Ying
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