From: Dave Hansen <dave.hansen@intel.com>
To: Zi Yan <ziy@nvidia.com>
Cc: Shakeel Butt <shakeelb@google.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
LKML <linux-kernel@vger.kernel.org>,
Linux MM <linux-mm@kvack.org>,
Yang Shi <yang.shi@linux.alibaba.com>,
David Rientjes <rientjes@google.com>,
Huang Ying <ying.huang@intel.com>,
Dan Williams <dan.j.williams@intel.com>
Subject: Re: [RFC] [PATCH 0/8] Migrate Pages in lieu of discard
Date: Wed, 1 Jul 2020 07:32:16 -0700 [thread overview]
Message-ID: <9c47b66b-f381-4b98-2e8f-7262e8567e15@intel.com> (raw)
In-Reply-To: <8927EC7B-76F2-4DFC-9AD8-EC2F15E3CEF9@nvidia.com>
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
On 7/1/20 7:24 AM, Zi Yan wrote:
> On 30 Jun 2020, at 15:31, Dave Hansen wrote:
>>> BTW is this proposal only for systems having multi-tiers of
>>> memory? Can a multi-node DRAM-only system take advantage of
>>> this proposal? For example I have a system with two DRAM nodes
>>> running two jobs hardwalled to each node. For each job the
>>> other node is kind of low-tier memory. If I can describe the
>>> per-job demotion paths then these jobs can take advantage of
>>> this proposal during occasional peaks.
>> I don't see any reason it could not work there. There would just
>> need to be a way to set up a different demotion path policy that
>> what was done here.
> We might need a different threshold (or GFP flag) for allocating
> new pages in remote node for demotion. Otherwise, we could see
> scenarios like: two nodes in a system are almost full and Node A
> is trying to demote some pages to Node B, which triggers page
> demotion from Node B to Node A.
I've always assumed that migration cycles would be illegal since it's
so hard to guarantee forward reclaim progress with them in place.
-----BEGIN PGP SIGNATURE-----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=MjgB
-----END PGP SIGNATURE-----
prev parent reply other threads:[~2020-07-01 14:32 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-29 23:45 [RFC][PATCH 0/8] Migrate Pages in lieu of discard Dave Hansen
2020-06-29 23:45 ` [RFC][PATCH 1/8] mm/numa: node demotion data structure and lookup Dave Hansen
2020-06-29 23:45 ` [RFC][PATCH 2/8] mm/migrate: Defer allocating new page until needed Dave Hansen
2020-07-01 8:47 ` Greg Thelen
2020-07-01 14:46 ` Dave Hansen
2020-07-01 18:32 ` Yang Shi
2020-06-29 23:45 ` [RFC][PATCH 3/8] mm/vmscan: Attempt to migrate page in lieu of discard Dave Hansen
2020-07-01 0:47 ` David Rientjes
2020-07-01 1:29 ` Yang Shi
2020-07-01 5:41 ` David Rientjes
2020-07-01 8:54 ` Huang, Ying
2020-07-01 18:20 ` Dave Hansen
2020-07-01 19:50 ` David Rientjes
2020-07-02 1:50 ` Huang, Ying
2020-07-01 15:15 ` Dave Hansen
2020-07-01 17:21 ` Yang Shi
2020-07-01 19:45 ` David Rientjes
2020-07-02 10:02 ` Jonathan Cameron
2020-07-01 1:40 ` Huang, Ying
2020-07-01 16:48 ` Dave Hansen
2020-07-01 19:25 ` David Rientjes
2020-07-02 5:02 ` Huang, Ying
2020-06-29 23:45 ` [RFC][PATCH 4/8] mm/vmscan: add page demotion counter Dave Hansen
2020-06-29 23:45 ` [RFC][PATCH 5/8] mm/numa: automatically generate node migration order Dave Hansen
2020-06-30 8:22 ` Huang, Ying
2020-07-01 18:23 ` Dave Hansen
2020-07-02 1:20 ` Huang, Ying
2020-06-29 23:45 ` [RFC][PATCH 6/8] mm/vmscan: Consider anonymous pages without swap Dave Hansen
2020-06-29 23:45 ` [RFC][PATCH 7/8] mm/vmscan: never demote for memcg reclaim Dave Hansen
2020-06-29 23:45 ` [RFC][PATCH 8/8] mm/numa: new reclaim mode to enable reclaim-based migration Dave Hansen
2020-06-30 7:23 ` Huang, Ying
[not found] ` <29c67873-3cb9-e121-382c-9b81491016bc@linux.alibaba.com>
2020-07-01 0:48 ` Huang, Ying
2020-07-01 1:12 ` Yang Shi
2020-07-01 1:28 ` Huang, Ying
2020-07-01 16:02 ` Dave Hansen
2020-07-03 9:30 ` Huang, Ying
2020-06-30 18:36 ` [RFC][PATCH 0/8] Migrate Pages in lieu of discard Shakeel Butt
2020-06-30 18:51 ` Dave Hansen
2020-06-30 19:25 ` Shakeel Butt
2020-06-30 19:31 ` Dave Hansen
2020-07-01 14:24 ` [RFC] [PATCH " Zi Yan
2020-07-01 14:32 ` Dave Hansen [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=9c47b66b-f381-4b98-2e8f-7262e8567e15@intel.com \
--to=dave.hansen@intel.com \
--cc=dan.j.williams@intel.com \
--cc=dave.hansen@linux.intel.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=rientjes@google.com \
--cc=shakeelb@google.com \
--cc=yang.shi@linux.alibaba.com \
--cc=ying.huang@intel.com \
--cc=ziy@nvidia.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).