[merged mm-stable] mm-page_alloc-batch-vmstat-updates-in-expand.patch removed from -mm tree

[merged mm-stable] mm-page_alloc-batch-vmstat-updates-in-expand.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: mm: page_alloc: batch vmstat updates in expand()
has been removed from the -mm tree.  Its filename was
     mm-page_alloc-batch-vmstat-updates-in-expand.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: Johannes Weiner <hannes@cmpxchg.org>
Subject: mm: page_alloc: batch vmstat updates in expand()
Date: Wed, 27 Mar 2024 15:01:11 -0400

expand() currently updates vmstat for every subpage.  This is unnecessary,
since they're all of the same zone and migratetype.

Count added pages locally, then do a single vmstat update.

Link: https://lkml.kernel.org/r/20240327190111.GC7597@cmpxchg.org
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Suggested-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/page_alloc.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/mm/page_alloc.c~mm-page_alloc-batch-vmstat-updates-in-expand
+++ a/mm/page_alloc.c
@@ -1335,6 +1335,7 @@ static inline void expand(struct zone *z
 	int low, int high, int migratetype)
 {
 	unsigned long size = 1 << high;
+	unsigned long nr_added = 0;
 
 	while (high > low) {
 		high--;
@@ -1350,9 +1351,11 @@ static inline void expand(struct zone *z
 		if (set_page_guard(zone, &page[size], high))
 			continue;
 
-		add_to_free_list(&page[size], zone, high, migratetype, false);
+		__add_to_free_list(&page[size], zone, high, migratetype, false);
 		set_buddy_order(&page[size], high);
+		nr_added += size;
 	}
+	account_freepages(zone, nr_added, migratetype);
 }
 
 static void check_new_page_bad(struct page *page)
_

Patches currently in -mm which might be from hannes@cmpxchg.org are