linux-kernel - Re: [PATCH 0/2] Implement numa node notifier

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Message-ID: <20250403132954.0000779f@huawei.com>
Date: Thu, 3 Apr 2025 13:29:54 +0100
From: Jonathan Cameron <Jonathan.Cameron@...wei.com>
To: Oscar Salvador <osalvador@...e.de>
CC: Andrew Morton <akpm@...ux-foundation.org>, David Hildenbrand
	<david@...hat.com>, <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
	Vlastimil Babka <vbabka@...e.cz>, Hyeonggon Yoo <42.hyeyoo@...il.com>,
	<mkoutny@...e.com>, Dan Williams <dan.j.williams@...el.com>,
	<linux-cxl@...r.kernel.org>
Subject: Re: [PATCH 0/2] Implement numa node notifier

On Tue,  1 Apr 2025 11:27:14 +0200
Oscar Salvador <osalvador@...e.de> wrote:

> Memory notifier is a tool that allow consumers to get notified whenever
> memory gets onlined or offlined in the system.
> Currently, there are 10 consumers of that, but 5 out of those 10 consumers
> are only interested in getting notifications when a numa node has changed its
> state.
> That means going from memoryless to memory-aware of vice versa.
> 
> Which means that for every {online,offline}_pages operation they get
> notified even though the numa node might not have changed its state.
> 
> The first patch implements a numa node notifier that does just that, and have
> those consumers register in there, so they get notified only when they are
> interested.
> 
> The second patch replaces 'status_change_normal{_normal}' fields within
> memory_notify with a 'nid', as that is only what we need for memory
> notifer and update the only user of it (page_ext).
> 
> Consumers that are only interested in numa node states change are:
> 
>  - memory-tier
>  - slub
>  - cpuset
>  - hmat
>  - cxl
> 
Hi Oscar,

Idea seems good to me.

+CC linux-cxl for information of others not on the thread.

> 
> Oscar Salvador (2):
>   mm,memory_hotplug: Implement numa node notifier
>   mm,memory_hotplug: Replace status_change_nid parameter in
>     memory_notify
> 
>  drivers/acpi/numa/hmat.c  |  6 +--
>  drivers/base/node.c       | 19 +++++++++
>  drivers/cxl/core/region.c | 14 +++----
>  drivers/cxl/cxl.h         |  4 +-
>  include/linux/memory.h    | 37 ++++++++++++++++++
>  kernel/cgroup/cpuset.c    |  2 +-
>  mm/memory-tiers.c         |  8 ++--
>  mm/memory_hotplug.c       | 82 +++++++++++++++++++++++++++++----------
>  mm/page_ext.c             | 12 +-----
>  mm/slub.c                 | 22 +++++------
>  10 files changed, 146 insertions(+), 60 deletions(-)
>