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From: Yang Shi <yang.shi@linux.alibaba.com>
To: Dave Hansen <dave.hansen@intel.com>,
	mhocko@suse.com, mgorman@techsingularity.net, riel@surriel.com,
	hannes@cmpxchg.org, akpm@linux-foundation.org,
	keith.busch@intel.com, dan.j.williams@intel.com,
	fengguang.wu@intel.com, fan.du@intel.com, ying.huang@intel.com,
	ziy@nvidia.com
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [v2 PATCH 5/9] mm: vmscan: demote anon DRAM pages to PMEM node
Date: Mon, 15 Apr 2019 15:10:00 -0700	[thread overview]
Message-ID: <0f4d092d-1421-7163-d937-f8aa681db594@linux.alibaba.com> (raw)
In-Reply-To: <bc4cd9b2-327d-199b-6de4-61561b45c661@intel.com>



On 4/11/19 7:31 AM, Dave Hansen wrote:
> On 4/10/19 8:56 PM, Yang Shi wrote:
>>   include/linux/gfp.h            |  12 ++++
>>   include/linux/migrate.h        |   1 +
>>   include/trace/events/migrate.h |   3 +-
>>   mm/debug.c                     |   1 +
>>   mm/internal.h                  |  13 +++++
>>   mm/migrate.c                   |  15 ++++-
>>   mm/vmscan.c                    | 127 +++++++++++++++++++++++++++++++++++------
>>   7 files changed, 149 insertions(+), 23 deletions(-)
> Yikes, that's a lot of code.
>
> And it only handles anonymous pages?

Yes, for the time being. But, it is easy to extend to all kind of pages.

>
> Also, I don't see anything in the code tying this to strictly demote
> from DRAM to PMEM.  Is that the end effect, or is it really implemented
> that way and I missed it?

No, not restrict to PMEM. It just tries to demote from "preferred node" 
(or called compute node) to a memory-only node. In the hardware with 
PMEM, PMEM would be the memory-only node.

Thanks,
Yang



  reply	other threads:[~2019-04-15 22:10 UTC|newest]

Thread overview: 55+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-11  3:56 [v2 RFC PATCH 0/9] Another Approach to Use PMEM as NUMA Node Yang Shi
2019-04-11  3:56 ` [v2 PATCH 1/9] mm: define N_CPU_MEM node states Yang Shi
2019-04-11  3:56 ` [v2 PATCH 2/9] mm: page_alloc: make find_next_best_node find return cpuless node Yang Shi
2019-04-11  3:56 ` [v2 PATCH 3/9] mm: numa: promote pages to DRAM when it gets accessed twice Yang Shi
2019-04-11  3:56 ` [v2 PATCH 4/9] mm: migrate: make migrate_pages() return nr_succeeded Yang Shi
2019-04-11  3:56 ` [v2 PATCH 5/9] mm: vmscan: demote anon DRAM pages to PMEM node Yang Shi
2019-04-11 14:31   ` Dave Hansen
2019-04-15 22:10     ` Yang Shi [this message]
2019-04-15 22:14       ` Dave Hansen
2019-04-15 22:26         ` Yang Shi
2019-04-11  3:56 ` [v2 PATCH 6/9] mm: vmscan: don't demote for memcg reclaim Yang Shi
2019-04-11  3:56 ` [v2 PATCH 7/9] mm: vmscan: check if the demote target node is contended or not Yang Shi
2019-04-11 16:06   ` Dave Hansen
2019-04-15 22:06     ` Yang Shi
2019-04-15 22:13       ` Dave Hansen
2019-04-15 22:23         ` Yang Shi
2019-04-11  3:56 ` [v2 PATCH 8/9] mm: vmscan: add page demotion counter Yang Shi
2019-04-11  3:56 ` [v2 PATCH 9/9] mm: numa: add page promotion counter Yang Shi
2019-04-11 14:28 ` [v2 RFC PATCH 0/9] Another Approach to Use PMEM as NUMA Node Dave Hansen
2019-04-12  8:47 ` Michal Hocko
2019-04-16  0:09   ` Yang Shi
2019-04-16  7:47     ` Michal Hocko
2019-04-16 14:30       ` Dave Hansen
2019-04-16 14:39         ` Michal Hocko
2019-04-16 15:46           ` Dave Hansen
2019-04-16 18:34             ` Michal Hocko
2019-04-16 15:33         ` Zi Yan
2019-04-16 15:55           ` Dave Hansen
2019-04-16 16:12             ` Zi Yan
2019-04-16 19:19       ` Yang Shi
2019-04-16 21:22         ` Dave Hansen
2019-04-16 21:59           ` Yang Shi
2019-04-16 23:04             ` Dave Hansen
2019-04-16 23:17               ` Yang Shi
2019-04-17 15:13                 ` Keith Busch
2019-04-17  9:23           ` Michal Hocko
2019-04-17 15:23             ` Keith Busch
2019-04-17 15:39               ` Michal Hocko
2019-04-17 15:37                 ` Keith Busch
2019-04-17 16:39                   ` Michal Hocko
2019-04-17 17:26                     ` Yang Shi
2019-04-17 17:29                       ` Keith Busch
2019-04-17 17:51                       ` Michal Hocko
2019-04-18 16:24                         ` Yang Shi
2019-04-17 17:13             ` Dave Hansen
2019-04-17 17:57               ` Michal Hocko
2019-04-18 18:16               ` Keith Busch
2019-04-18 19:23                 ` Yang Shi
2019-04-18 21:07                   ` Zi Yan
2019-04-16 23:18         ` Yang Shi
2019-04-17  9:17         ` Michal Hocko
2019-05-01  6:43           ` Fengguang Wu
2019-04-17 20:43         ` Yang Shi
2019-04-18  9:02           ` Michal Hocko
2019-05-01  5:20             ` Fengguang Wu

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