The patch titled
Subject: mm-only-re-generate-demotion-targets-when-a-numa-node-changes-its-n_cpu-state-v3
has been added to the -mm tree. Its filename is
mm-only-re-generate-demotion-targets-when-a-numa-node-changes-its-n_cpu-state-v3.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-only-re-generate-demotion-targets-when-a-numa-node-changes-its-n_cpu-state-v3.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-only-re-generate-demotion-targets-when-a-numa-node-changes-its-n_cpu-state-v3.patch
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Oscar Salvador <osalvador@xxxxxxx>
Subject: mm-only-re-generate-demotion-targets-when-a-numa-node-changes-its-n_cpu-state-v3
add feedback from Huang Ying
Link: https://lkml.kernel.org/r/20220314150945.12694-1-osalvador@xxxxxxx
Fixes: 884a6e5d1f93b ("mm/migrate: update node demotion order on hotplug events")
Reviewed-by: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx>
Tested-by: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx>
Reported-by: Abhishek Goel <huntbag@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Oscar Salvador <osalvador@xxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/migrate.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
--- a/mm/migrate.c~mm-only-re-generate-demotion-targets-when-a-numa-node-changes-its-n_cpu-state-v3
+++ a/mm/migrate.c
@@ -3280,12 +3280,16 @@ void __init migrate_on_reclaim_init(void
GFP_KERNEL);
WARN_ON(!node_demotion);
+ hotplug_memory_notifier(migrate_on_reclaim_callback, 100);
/*
* At this point, all numa nodes with memory/CPus have their state
* properly set, so we can build the demotion order now.
+ * Let us hold the cpu_hotplug lock just, as we could possibily have
+ * CPU hotplug events during boot.
*/
+ cpus_read_lock();
set_migration_target_nodes();
- hotplug_memory_notifier(migrate_on_reclaim_callback, 100);
+ cpus_read_unlock();
}
#endif /* CONFIG_HOTPLUG_CPU */
_
Patches currently in -mm which might be from osalvador@xxxxxxx are
arch-x86-mm-numa-do-not-initialize-nodes-twice.patch
arch-x86-mm-numa-do-not-initialize-nodes-twice-v2.patch
mm-only-re-generate-demotion-targets-when-a-numa-node-changes-its-n_cpu-state.patch
mm-only-re-generate-demotion-targets-when-a-numa-node-changes-its-n_cpu-state-v3.patch
