linux-kernel - [PATCH 2/5] mm/compaction: set compact_cached_free_pfn correctly in update_pageblock

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Message-Id: <20230729174354.2239980-3-shikemeng@huaweicloud.com>
Date:   Sun, 30 Jul 2023 01:43:51 +0800
From:   Kemeng Shi <shikemeng@...weicloud.com>
To:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        akpm@...ux-foundation.org
Cc:     baolin.wang@...ux.alibaba.com, mgorman@...hsingularity.net,
        willy@...radead.org, david@...hat.com, shikemeng@...weicloud.com
Subject: [PATCH 2/5] mm/compaction: set compact_cached_free_pfn correctly in update_pageblock_skip

We will set skip to page block of block_start_pfn, it's more reasonable
to set compact_cached_free_pfn to page block before the block_start_pfn.

Signed-off-by: Kemeng Shi <shikemeng@...weicloud.com>
---
 mm/compaction.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mm/compaction.c b/mm/compaction.c
index d1d28d57e5bd..4a784872565a 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -1690,7 +1690,8 @@ static void isolate_freepages(struct compact_control *cc)
 
 		/* Update the skip hint if the full pageblock was scanned */
 		if (isolate_start_pfn >= block_end_pfn)
-			update_pageblock_skip(cc, page, block_start_pfn);
+			update_pageblock_skip(cc, page, block_start_pfn -
+					      pageblock_nr_pages);
 
 		/* Are enough freepages isolated? */
 		if (cc->nr_freepages >= cc->nr_migratepages) {
-- 
2.30.0