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* [PATCH RESEND v2] mm: remove lru_add_drain_all in alloc_contig_range
@ 2021-03-03 20:45 Minchan Kim
  0 siblings, 0 replies; only message in thread
From: Minchan Kim @ 2021-03-03 20:45 UTC (permalink / raw)
  To: Andrew Morton
  Cc: LKML, linux-mm, joaodias, Minchan Kim, Oscar Salvador,
	Vlastimil Babka, Michal Hocko

__alloc_contig_migrate_range already has lru_add_drain_all call
via migrate_prep. It's necessary to move LRU taget pages into
LRU list to be able to isolated. However, lru_add_drain_all call
after __alloc_contig_migrate_range is pointless since it has changed
source page freeing from putback_lru_pages to put_page[1].

This patch removes it.

[1] c6c919eb90e0, ("mm: use put_page() to free page instead of putback_lru_page()"

Reviewed-by: Oscar Salvador <>
Acked-by: Vlastimil Babka <>
Acked-by: Michal Hocko <>
Signed-off-by: Minchan Kim <>
* From v1 -
  * add [Acked|Reviewed]-by - vbabka, mhocko, osalvador
  * add history to the description - vbabka

 mm/page_alloc.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index f10966e3b4a5..11579f0ddba9 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -8616,8 +8616,6 @@ int alloc_contig_range(unsigned long start, unsigned long end,
 	 * isolated thus they won't get removed from buddy.
-	lru_add_drain_all();
 	order = 0;
 	outer_start = start;
 	while (!PageBuddy(pfn_to_page(outer_start))) {

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2021-03-03 20:45 [PATCH RESEND v2] mm: remove lru_add_drain_all in alloc_contig_range Minchan Kim

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