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From: Fengguang Wu <fengguang.wu@intel.com>
To: Michal Hocko <mhocko@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	Linux Memory Management List <linux-mm@kvack.org>,
	kvm@vger.kernel.org, LKML <linux-kernel@vger.kernel.org>,
	Fan Du <fan.du@intel.com>, Yao Yuan <yuan.yao@intel.com>,
	Peng Dong <dongx.peng@intel.com>,
	Huang Ying <ying.huang@intel.com>,
	Liu Jingqi <jingqi.liu@intel.com>,
	Dong Eddie <eddie.dong@intel.com>,
	Dave Hansen <dave.hansen@intel.com>,
	Zhang Yi <yi.z.zhang@linux.intel.com>,
	Dan Williams <dan.j.williams@intel.com>
Subject: Re: [RFC][PATCH v2 00/21] PMEM NUMA node and hotness accounting/migration
Date: Fri, 28 Dec 2018 21:31:11 +0800	[thread overview]
Message-ID: <20181228133111.zromvopkfcg3m5oy@wfg-t540p.sh.intel.com> (raw)
In-Reply-To: <20181228121515.GS16738@dhcp22.suse.cz>

>> > I haven't looked at the implementation yet but if you are proposing a
>> > special cased zone lists then this is something CDM (Coherent Device
>> > Memory) was trying to do two years ago and there was quite some
>> > skepticism in the approach.
>>
>> It looks we are pretty different than CDM. :)
>> We creating new NUMA nodes rather than CDM's new ZONE.
>> The zonelists modification is just to make PMEM nodes more separated.
>
>Yes, this is exactly what CDM was after. Have a zone which is not
>reachable without explicit request AFAIR. So no, I do not think you are
>too different, you just use a different terminology ;)

Got it. OK.. The fall back zonelists patch does need more thoughts.

In long term POV, Linux should be prepared for multi-level memory.
Then there will arise the need to "allocate from this level memory".
So it looks good to have separated zonelists for each level of memory.  

On the other hand, there will also be page allocations that don't care
about the exact memory level. So it looks reasonable to expect
different kind of fallback zonelists that can be selected by NUMA policy.

Thanks,
Fengguang

  parent reply	other threads:[~2018-12-28 13:31 UTC|newest]

Thread overview: 99+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-12-26 13:14 [RFC][PATCH v2 00/21] PMEM NUMA node and hotness accounting/migration Fengguang Wu
2018-12-26 13:14 ` Fengguang Wu
2018-12-26 13:14 ` [RFC][PATCH v2 01/21] e820: cheat PMEM as DRAM Fengguang Wu
2018-12-26 13:14   ` Fengguang Wu
2018-12-27  3:41   ` Matthew Wilcox
2018-12-27  4:11     ` Fengguang Wu
2018-12-27  5:13       ` Dan Williams
2018-12-27  5:13         ` Dan Williams
2018-12-27 19:32         ` Yang Shi
2018-12-27 19:32           ` Yang Shi
2018-12-28  3:27           ` Fengguang Wu
2018-12-26 13:14 ` [RFC][PATCH v2 02/21] acpi/numa: memorize NUMA node type from SRAT table Fengguang Wu
2018-12-26 13:14   ` Fengguang Wu
2018-12-26 13:14 ` [RFC][PATCH v2 03/21] x86/numa_emulation: fix fake NUMA in uniform case Fengguang Wu
2018-12-26 13:14   ` Fengguang Wu
2018-12-26 13:14 ` [RFC][PATCH v2 04/21] x86/numa_emulation: pass numa node type to fake nodes Fengguang Wu
2018-12-26 13:14   ` Fengguang Wu
2018-12-26 13:14 ` [RFC][PATCH v2 05/21] mmzone: new pgdat flags for DRAM and PMEM Fengguang Wu
2018-12-26 13:14   ` Fengguang Wu
2018-12-26 13:14 ` [RFC][PATCH v2 06/21] x86,numa: update numa node type Fengguang Wu
2018-12-26 13:14   ` Fengguang Wu
2018-12-26 13:14 ` [RFC][PATCH v2 07/21] mm: export node type {pmem|dram} under /sys/bus/node Fengguang Wu
2018-12-26 13:14   ` Fengguang Wu
2018-12-26 13:14 ` [RFC][PATCH v2 08/21] mm: introduce and export pgdat peer_node Fengguang Wu
2018-12-26 13:14   ` Fengguang Wu
2018-12-27 20:07   ` Christopher Lameter
2018-12-27 20:07     ` Christopher Lameter
2018-12-28  2:31     ` Fengguang Wu
2018-12-26 13:14 ` [RFC][PATCH v2 09/21] mm: avoid duplicate peer target node Fengguang Wu
2018-12-26 13:14   ` Fengguang Wu
2018-12-26 13:14 ` [RFC][PATCH v2 10/21] mm: build separate zonelist for PMEM and DRAM node Fengguang Wu
2018-12-26 13:14   ` Fengguang Wu
2019-01-01  9:14   ` Aneesh Kumar K.V
2019-01-01  9:14     ` Aneesh Kumar K.V
2019-01-07  9:57     ` Fengguang Wu
2019-01-07 14:09       ` Aneesh Kumar K.V
2018-12-26 13:14 ` [RFC][PATCH v2 11/21] kvm: allocate page table pages from DRAM Fengguang Wu
2018-12-26 13:14   ` Fengguang Wu
2019-01-01  9:23   ` Aneesh Kumar K.V
2019-01-01  9:23     ` Aneesh Kumar K.V
2019-01-02  0:59     ` Yuan Yao
2019-01-02 16:47   ` Dave Hansen
2019-01-07 10:21     ` Fengguang Wu
2018-12-26 13:14 ` [RFC][PATCH v2 12/21] x86/pgtable: " Fengguang Wu
2018-12-26 13:14   ` Fengguang Wu
2018-12-26 13:14 ` [RFC][PATCH v2 13/21] x86/pgtable: dont check PMD accessed bit Fengguang Wu
2018-12-26 13:14   ` Fengguang Wu
2018-12-26 13:15 ` [RFC][PATCH v2 14/21] kvm: register in mm_struct Fengguang Wu
2018-12-26 13:15   ` Fengguang Wu
2019-02-02  6:57   ` Peter Xu
2019-02-02 10:50     ` Fengguang Wu
2019-02-04 10:46     ` Paolo Bonzini
2018-12-26 13:15 ` [RFC][PATCH v2 15/21] ept-idle: EPT walk for virtual machine Fengguang Wu
2018-12-26 13:15   ` Fengguang Wu
2018-12-26 13:15 ` [RFC][PATCH v2 16/21] mm-idle: mm_walk for normal task Fengguang Wu
2018-12-26 13:15   ` Fengguang Wu
2018-12-26 13:15 ` [RFC][PATCH v2 17/21] proc: introduce /proc/PID/idle_pages Fengguang Wu
2018-12-26 13:15   ` Fengguang Wu
2018-12-26 13:15 ` [RFC][PATCH v2 18/21] kvm-ept-idle: enable module Fengguang Wu
2018-12-26 13:15   ` Fengguang Wu
2018-12-26 13:15 ` [RFC][PATCH v2 19/21] mm/migrate.c: add move_pages(MPOL_MF_SW_YOUNG) flag Fengguang Wu
2018-12-26 13:15   ` Fengguang Wu
2018-12-26 13:15 ` [RFC][PATCH v2 20/21] mm/vmscan.c: migrate anon DRAM pages to PMEM node Fengguang Wu
2018-12-26 13:15   ` Fengguang Wu
2018-12-26 13:15 ` [RFC][PATCH v2 21/21] mm/vmscan.c: shrink anon list if can migrate to PMEM Fengguang Wu
2018-12-26 13:15   ` Fengguang Wu
2018-12-27 20:31 ` [RFC][PATCH v2 00/21] PMEM NUMA node and hotness accounting/migration Michal Hocko
2018-12-28  5:08   ` Fengguang Wu
2018-12-28  8:41     ` Michal Hocko
2018-12-28  9:42       ` Fengguang Wu
2018-12-28 12:15         ` Michal Hocko
2018-12-28 13:15           ` Fengguang Wu
2018-12-28 13:15             ` Fengguang Wu
2018-12-28 19:46             ` Michal Hocko
2018-12-28 13:31           ` Fengguang Wu [this message]
2018-12-28 18:28             ` Yang Shi
2018-12-28 18:28               ` Yang Shi
2018-12-28 19:52             ` Michal Hocko
2019-01-02 12:21               ` Jonathan Cameron
2019-01-02 12:21                 ` Jonathan Cameron
2019-01-08 14:52                 ` Michal Hocko
2019-01-10 15:53                   ` Jerome Glisse
2019-01-10 15:53                     ` Jerome Glisse
2019-01-10 16:42                     ` Michal Hocko
2019-01-10 17:42                       ` Jerome Glisse
2019-01-10 17:42                         ` Jerome Glisse
2019-01-10 18:26                   ` Jonathan Cameron
2019-01-10 18:26                     ` Jonathan Cameron
2019-01-28 17:42                 ` Jonathan Cameron
2019-01-28 17:42                   ` Jonathan Cameron
2019-01-29  2:00                   ` Fengguang Wu
2019-01-03 10:57               ` Mel Gorman
2019-01-10 16:25               ` Jerome Glisse
2019-01-10 16:25                 ` Jerome Glisse
2019-01-10 16:50                 ` Michal Hocko
2019-01-10 18:02                   ` Jerome Glisse
2019-01-10 18:02                     ` Jerome Glisse
2019-01-02 18:12       ` Dave Hansen
2019-01-08 14:53         ` Michal Hocko

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