linux-kernel - [PATCH 3/4] mm, compaction: Finish scanning the current pageblock if requested

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Date:   Wed, 25 Jan 2023 13:44:33 +0000
From:   Mel Gorman <mgorman@...hsingularity.net>
To:     Vlastimil Babka <vbabka@...e.cz>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Maxim Levitsky <mlevitsk@...hat.com>,
        Michal Hocko <mhocko@...nel.org>,
        Pedro Falcato <pedro.falcato@...il.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Chuyi Zhou <zhouchuyi@...edance.com>,
        Linux-MM <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Mel Gorman <mgorman@...hsingularity.net>
Subject: [PATCH 3/4] mm, compaction: Finish scanning the current pageblock if requested

cc->finish_pageblock is set when the current pageblock should be
rescanned but fast_find_migrateblock can select an alternative
block. Disable fast_find_migrateblock when the current pageblock
scan should be completed.

Signed-off-by: Mel Gorman <mgorman@...hsingularity.net>
---
 mm/compaction.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/mm/compaction.c b/mm/compaction.c
index 28711a21a8a2..4b3a0238879c 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -1762,6 +1762,13 @@ static unsigned long fast_find_migrateblock(struct compact_control *cc)
 	if (cc->ignore_skip_hint)
 		return pfn;
 
+	/*
+	 * If the pageblock should be finished then do not select a different
+	 * pageblock.
+	 */
+	if (cc->finish_pageblock)
+		return pfn;
+
 	/*
 	 * If the migrate_pfn is not at the start of a zone or the start
 	 * of a pageblock then assume this is a continuation of a previous
-- 
2.35.3