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From: Yang Shi <yang.shi@linux.alibaba.com>
To: Dave Hansen <dave.hansen@intel.com>, Michal Hocko <mhocko@kernel.org>
Cc: 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, linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [v2 RFC PATCH 0/9] Another Approach to Use PMEM as NUMA Node
Date: Tue, 16 Apr 2019 16:17:44 -0700	[thread overview]
Message-ID: <8bc32012-b747-3827-1814-91942357d170@linux.alibaba.com> (raw)
In-Reply-To: <1556283f-de69-ce65-abf8-22f6f8d7d358@intel.com>



On 4/16/19 4:04 PM, Dave Hansen wrote:
> On 4/16/19 2:59 PM, Yang Shi wrote:
>> On 4/16/19 2:22 PM, Dave Hansen wrote:
>>> Keith Busch had a set of patches to let you specify the demotion order
>>> via sysfs for fun.  The rules we came up with were:
>>> 1. Pages keep no history of where they have been
>>> 2. Each node can only demote to one other node
>> Does this mean any remote node? Or just DRAM to PMEM, but remote PMEM
>> might be ok?
> In Keith's code, I don't think we differentiated.  We let any node
> demote to any other node you want, as long as it follows the cycle rule.

I recall Keith's code let the userspace define the target node. Anyway, 
we may need add one rule: not migrate-on-reclaim from PMEM node. 
Demoting from PMEM to DRAM sounds pointless.



  reply	other threads:[~2019-04-16 23:17 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
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 [this message]
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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