[nacked] mm-page_alloc-speeding-up-the-iteration-of-max_order.patch removed from -mm tree

[nacked] mm-page_alloc-speeding-up-the-iteration-of-max_order.patch removed from -mm tree

[akpm]

The patch titled
     Subject: mm/page_alloc: speed up the iteration of max_order
has been removed from the -mm tree.  Its filename was
     mm-page_alloc-speeding-up-the-iteration-of-max_order.patch

This patch was dropped because it was nacked

------------------------------------------------------
From: Muchun Song <songmuchun@bytedance.com>
Subject: mm/page_alloc: speed up the iteration of max_order

When we free a page whose order is very close to MAX_ORDER and greater
than pageblock_order, it wastes some CPU cycles to increase max_order to
MAX_ORDER one by one and check the pageblock migratetype of that page
repeatedly especially when MAX_ORDER is much larger than pageblock_order.

Link: https://lkml.kernel.org/r/20201202121838.75218-1-songmuchun@bytedance.com
Signed-off-by: Muchun Song <songmuchun@bytedance.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/page_alloc.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/mm/page_alloc.c~mm-page_alloc-speeding-up-the-iteration-of-max_order
+++ a/mm/page_alloc.c
@@ -1035,7 +1035,7 @@ continue_merging:
 		pfn = combined_pfn;
 		order++;
 	}
-	if (max_order < MAX_ORDER) {
+	if (max_order < MAX_ORDER && order < MAX_ORDER - 1) {
 		/* If we are here, it means order is >= pageblock_order.
 		 * We want to prevent merge between freepages on isolate
 		 * pageblock and normal pageblock. Without this, pageblock
@@ -1056,6 +1056,8 @@ continue_merging:
 						is_migrate_isolate(buddy_mt)))
 				goto done_merging;
 		}
+		if (unlikely(order != max_order - 1))
+			max_order = order + 1;
 		max_order++;
 		goto continue_merging;
 	}
_

Patches currently in -mm which might be from songmuchun@bytedance.com are

mm-memcontrol-remove-unused-mod_memcg_obj_state.patch
mm-memcg-slab-fix-return-child-memcg-objcg-for-root-memcg.patch
mm-memcg-slab-fix-use-after-free-in-obj_cgroup_charge.patch
mm-memcg-slab-rename-_lruvec_slab_state-to-_lruvec_kmem_state.patch
mm-page_isolation-do-not-isolate-the-max-order-page.patch