[merged mm-stable] memory-tiering-read-last_cpupid-correctly-in-do_huge_pmd_numa_page.patch removed from -mm tree

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The quilt patch titled
     Subject: memory tiering: read last_cpupid correctly in do_huge_pmd_numa_page()
has been removed from the -mm tree.  Its filename was
     memory-tiering-read-last_cpupid-correctly-in-do_huge_pmd_numa_page.patch

This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: Zi Yan <ziy@xxxxxxxxxx>
Subject: memory tiering: read last_cpupid correctly in do_huge_pmd_numa_page()
Date: Wed, 24 Jul 2024 09:01:13 -0400

Patch series "Various memory tiering fixes", v3.


This patch (of 3):

last_cpupid is only available when memory tiering is off or the folio is
in toptier node.  Complete the check to read last_cpupid when it is
available.

Before the fix, the default last_cpupid will be used even if memory
tiering mode is turned off at runtime instead of the actual value.  This
can prevent task_numa_fault() from getting right numa fault stats, but
should not cause any crash.  User might see performance changes after the
fix.

Link: https://lkml.kernel.org/r/20240724130115.793641-1-ziy@xxxxxxxxxx
Link: https://lkml.kernel.org/r/20240724130115.793641-2-ziy@xxxxxxxxxx
Fixes: 33024536bafd ("memory tiering: hot page selection with hint page fault latency")
Signed-off-by: Zi Yan <ziy@xxxxxxxxxx>
Reported-by: David Hildenbrand <david@xxxxxxxxxx>
Closes: https://lore.kernel.org/linux-mm/9af34a6b-ca56-4a64-8aa6-ade65f109288@xxxxxxxxxx/
Reviewed-by: "Huang, Ying" <ying.huang@xxxxxxxxx>
Reviewed-by: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx>
Acked-by: David Hildenbrand <david@xxxxxxxxxx>
Reviewed-by: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
Cc: Lorenzo Stoakes <lorenzo.stoakes@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 mm/huge_memory.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/mm/huge_memory.c~memory-tiering-read-last_cpupid-correctly-in-do_huge_pmd_numa_page
+++ a/mm/huge_memory.c
@@ -1707,7 +1707,8 @@ vm_fault_t do_huge_pmd_numa_page(struct
 	 * For memory tiering mode, cpupid of slow memory page is used
 	 * to record page access time.  So use default value.
 	 */
-	if (node_is_toptier(nid))
+	if (!(sysctl_numa_balancing_mode & NUMA_BALANCING_MEMORY_TIERING) ||
+	    node_is_toptier(nid))
 		last_cpupid = folio_last_cpupid(folio);
 	target_nid = numa_migrate_prep(folio, vmf, haddr, nid, &flags);
 	if (target_nid == NUMA_NO_NODE)
_

Patches currently in -mm which might be from ziy@xxxxxxxxxx are






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