linux-kernel - [PATCH 2/2] mm/page_alloc: use get_pfnblock_migratetype to avoid extra page_to

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Message-Id: <20230811115945.3423894-3-shikemeng@huaweicloud.com>
Date:   Fri, 11 Aug 2023 19:59:45 +0800
From:   Kemeng Shi <shikemeng@...weicloud.com>
To:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        akpm@...ux-foundation.org, baolin.wang@...ux.alibaba.com,
        mgorman@...hsingularity.net, david@...hat.com, willy@...radead.org
Cc:     shikemeng@...weicloud.com
Subject: [PATCH 2/2] mm/page_alloc: use get_pfnblock_migratetype to avoid extra page_to_pfn

We have get_pageblock_migratetype and get_pfnblock_migratetype to get
migratetype of page. get_pfnblock_migratetype accepts both page and pfn
from caller while get_pageblock_migratetype only accept page and get pfn
with page_to_pfn from page.
In case we already record pfn of page, we can simply call
get_pfnblock_migratetype to avoid a page_to_pfn.

Signed-off-by: Kemeng Shi <shikemeng@...weicloud.com>
---
 mm/page_alloc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 6c2294ccc6cb..56db21666611 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -813,7 +813,7 @@ static inline void __free_one_page(struct page *page,
 			 * pageblock isolation could cause incorrect freepage or CMA
 			 * accounting or HIGHATOMIC accounting.
 			 */
-			int buddy_mt = get_pageblock_migratetype(buddy);
+			int buddy_mt = get_pfnblock_migratetype(buddy, buddy_pfn);
 
 			if (migratetype != buddy_mt
 					&& (!migratetype_is_mergeable(migratetype) ||
@@ -889,7 +889,7 @@ int split_free_page(struct page *free_page,
 		goto out;
 	}
 
-	mt = get_pageblock_migratetype(free_page);
+	mt = get_pfnblock_migratetype(free_page, free_page_pfn);
 	if (likely(!is_migrate_isolate(mt)))
 		__mod_zone_freepage_state(zone, -(1UL << order), mt);
 
-- 
2.30.0