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Message-ID: <20250502083624.49849-1-osalvador@suse.de>
Date: Fri, 2 May 2025 10:36:21 +0200
From: Oscar Salvador <osalvador@...e.de>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: 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>,
Jonathan Cameron <Jonathan.Cameron@...wei.com>,
Rakie Kim <rakie.kim@...com>,
Oscar Salvador <osalvador@...e.de>
Subject: [PATCH v3 0/3] Implement numa node notifier
v2 -> v3:
- Add Suggested-by (David)
- Replace last N_NORMAL_MEMORY mention in slub (David)
- Replace the notifier for autoweitght-mempolicy
- Fix build on !CONFIG_MEMORY_HOTPLUG
v1 -> v2:
- Remove status_change_nid_normal and the code that
deals with it (David & Vlastimil)
- Remove slab_mem_offline_callback (David & Vlastimil)
- Change the order of canceling the notifiers
in {online,offline}_pages (Vlastimil)
- Fix up a couple of whitespaces (Jonathan Cameron)
- Add RBs-by
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 changes its
memory 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.
While we are doing this, remove status_change_nid_normal, as the only
current user (slub) does not really need it.
This allows us to further simplify and clean up the code.
The first patch gets rid of status_change_nid_normal in slub.
The second 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 third patch replaces 'status_change_nid{_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
- autoweight-mempolicy
Oscar Salvador (3):
mm,slub: Do not special case N_NORMAL nodes for slab_nodes
mm,memory_hotplug: Implement numa node notifier
mm,memory_hotplug: Rename status_change_nid parameter in memory_notify
drivers/acpi/numa/hmat.c | 6 +-
drivers/base/node.c | 21 +++++++
drivers/cxl/core/region.c | 14 ++---
drivers/cxl/cxl.h | 4 +-
include/linux/memory.h | 38 ++++++++++++-
kernel/cgroup/cpuset.c | 2 +-
mm/memory-tiers.c | 8 +--
mm/memory_hotplug.c | 117 +++++++++++++++++++++-----------------
mm/mempolicy.c | 8 +--
mm/page_ext.c | 12 +---
mm/slub.c | 45 +++------------
11 files changed, 153 insertions(+), 122 deletions(-)
--
2.49.0
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