linux-kernel - [PATCH] mm/page_alloc: only search higher order when fallback

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Date:   Wed,  3 Aug 2022 10:51:21 +0800
From:   Abel Wu <wuyun.abel@...edance.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Michal Hocko <mhocko@...nel.org>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Muchun Song <songmuchun@...edance.com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Abel Wu <wuyun.abel@...edance.com>
Subject: [PATCH] mm/page_alloc: only search higher order when fallback

It seems unnecessary to search pages with order < alloc_order in
fallback allocation.

Signed-off-by: Abel Wu <wuyun.abel@...edance.com>
---
 mm/page_alloc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index e008a3df0485..0abafc2fc3e0 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2934,7 +2934,7 @@ __rmqueue_fallback(struct zone *zone, int order, int start_migratetype,
 	 * i.e. orders < pageblock_order. If there are no local zones free,
 	 * the zonelists will be reiterated without ALLOC_NOFRAGMENT.
 	 */
-	if (alloc_flags & ALLOC_NOFRAGMENT)
+	if (order < pageblock_order && alloc_flags & ALLOC_NOFRAGMENT)
 		min_order = pageblock_order;
 
 	/*
-- 
2.31.1