linux-kernel - [PATCH] mm: remove lru_add_drain_all in alloc_contig

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Date:   Tue,  9 Feb 2021 09:50:48 -0800
From:   Minchan Kim <minchan@...nel.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-mm <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>,
        Michal Hocko <mhocko@...e.com>,
        David Hildenbrand <david@...hat.com>,
        Minchan Kim <minchan@...nel.org>
Subject: [PATCH] mm: remove lru_add_drain_all in alloc_contig_range

__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 called is pointless.

This patch removes it.

Signed-off-by: Minchan Kim <minchan@...nel.org>
---
 mm/page_alloc.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 6446778cbc6b..f8fbee73dd6d 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -8603,8 +8603,6 @@ 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))) {
-- 
2.30.0.478.g8a0d178c01-goog