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From: Jonathan Cameron <jonathan.cameron@huawei.com>
To: Michal Hocko <mhocko@kernel.org>
Cc: Fengguang Wu <fengguang.wu@intel.com>,
	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>,
	"Mel Gorman" <mgorman@suse.de>,
	Andrea Arcangeli <aarcange@redhat.com>,
	<linux-accelerators@lists.ozlabs.org>
Subject: Re: [RFC][PATCH v2 00/21] PMEM NUMA node and hotness accounting/migration
Date: Thu, 10 Jan 2019 18:26:10 +0000	[thread overview]
Message-ID: <20190110182610.00004250@huawei.com> (raw)
Message-ID: <20190110182610.yYQae1aWsghEcPv6J8O4SIBAaPFwneqXmL1b3DtDLtM@z> (raw)
In-Reply-To: <20190108145256.GX31793@dhcp22.suse.cz>

On Tue, 8 Jan 2019 15:52:56 +0100
Michal Hocko <mhocko@kernel.org> wrote:

> On Wed 02-01-19 12:21:10, Jonathan Cameron wrote:
> [...]
> > So ideally I'd love this set to head in a direction that helps me tick off
> > at least some of the above usecases and hopefully have some visibility on
> > how to address the others moving forwards,  
> 
> Is it sufficient to have such a memory marked as movable (aka only have
> ZONE_MOVABLE)? That should rule out most of the kernel allocations and
> it fits the "balance by migration" concept.

Yes, to some degree. That's exactly what we are doing, though a things currently
stand I think you have to turn it on via a kernel command line and mark it
hotpluggable in ACPI. Given it my or may not actually be hotpluggable
that's less than elegant.

Let's randomly decide not to explore that one further for a few more weeks.
la la la la

If we have general balancing by migration then things are definitely
heading in a useful direction as long as 'hot' takes into account the
main user not being a CPU.  You are right that migration dealing with
the movable kernel allocations is a nice side effect though which I
hadn't thought about.  Long run we might end up with everything where
it should be after some level of burn in period. A generic version of
this proposal is looking nicer and nicer!

Thanks,

Jonathan






  parent reply	other threads:[~2019-01-10 18:26 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
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 [this message]
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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