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Thu, 28 Aug 2025 02:16:43 -0700 (PDT) Received: from localhost ([185.92.221.13]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-afedaa774d1sm151433566b.89.2025.08.28.02.16.42 (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Thu, 28 Aug 2025 02:16:43 -0700 (PDT) From: Wei Yang To: akpm@linux-foundation.org Cc: linux-mm@kvack.org, Wei Yang , Johannes Weiner , Zi Yan , Vlastimil Babka , David Hildenbrand Subject: [PATCH] mm/page_alloc: find_large_buddy() from start_pfn aligned order Date: Thu, 28 Aug 2025 09:16:18 +0000 Message-Id: <20250828091618.7869-1-richard.weiyang@gmail.com> X-Mailer: git-send-email 2.11.0 X-Rspamd-Queue-Id: 3953B100009 X-Rspam-User: X-Stat-Signature: s8wmte4q77uzyjcik5z1wckmpods1pt5 X-Rspamd-Server: rspam09 X-HE-Tag: 1756372605-613178 X-HE-Meta: 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 QfZAsUVQ 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: We iterate pfn from order 0 to MAX_PAGE_ORDER aligned to find large buddy. While if the order is less than start_pfn aligned order, we would get the same pfn and do the same check again. Iterate from start_pfn aligned order to reduce duplicated work. Signed-off-by: Wei Yang Cc: Johannes Weiner Cc: Zi Yan Cc: Vlastimil Babka Cc: David Hildenbrand --- I build this and run, but not sure how fully test this. --- 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 27ea4c7acd15..7f2dfd30106f 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -2033,7 +2033,7 @@ static int move_freepages_block(struct zone *zone, struct page *page, /* Look for a buddy that straddles start_pfn */ static unsigned long find_large_buddy(unsigned long start_pfn) { - int order = 0; + int order = start_pfn ? __ffs(start_pfn) : MAX_PAGE_ORDER; struct page *page; unsigned long pfn = start_pfn; -- 2.34.1