+ mm-compaction-remove-unnecessary-cursor-page-in-isolate_freepages_block.patch added to mm-unstable branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: mm/compaction: remove unnecessary cursor page in isolate_freepages_block
has been added to the -mm mm-unstable branch.  Its filename is
     mm-compaction-remove-unnecessary-cursor-page-in-isolate_freepages_block.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-compaction-remove-unnecessary-cursor-page-in-isolate_freepages_block.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Kemeng Shi <shikemeng@huaweicloud.com>
Subject: mm/compaction: remove unnecessary cursor page in isolate_freepages_block
Date: Sun, 30 Jul 2023 01:43:53 +0800

The cursor is only used for page forward currently.  We can simply move
page forward directly to remove unnecessary cursor.

Link: https://lkml.kernel.org/r/20230729174354.2239980-5-shikemeng@huaweicloud.com
Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Kemeng Shi <shikemeng@huawei.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Mel Gorman <mgorman@techsingularity.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/compaction.c |   11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

--- a/mm/compaction.c~mm-compaction-remove-unnecessary-cursor-page-in-isolate_freepages_block
+++ a/mm/compaction.c
@@ -584,7 +584,7 @@ static unsigned long isolate_freepages_b
 				bool strict)
 {
 	int nr_scanned = 0, total_isolated = 0;
-	struct page *cursor;
+	struct page *page;
 	unsigned long flags = 0;
 	bool locked = false;
 	unsigned long blockpfn = *start_pfn;
@@ -594,12 +594,11 @@ static unsigned long isolate_freepages_b
 	if (strict)
 		stride = 1;
 
-	cursor = pfn_to_page(blockpfn);
+	page = pfn_to_page(blockpfn);
 
 	/* Isolate free pages. */
-	for (; blockpfn < end_pfn; blockpfn += stride, cursor += stride) {
+	for (; blockpfn < end_pfn; blockpfn += stride, page += stride) {
 		int isolated;
-		struct page *page = cursor;
 
 		/*
 		 * Periodically drop the lock (if held) regardless of its
@@ -624,7 +623,7 @@ static unsigned long isolate_freepages_b
 
 			if (likely(order <= MAX_ORDER)) {
 				blockpfn += (1UL << order) - 1;
-				cursor += (1UL << order) - 1;
+				page += (1UL << order) - 1;
 				nr_scanned += (1UL << order) - 1;
 			}
 			goto isolate_fail;
@@ -661,7 +660,7 @@ static unsigned long isolate_freepages_b
 		}
 		/* Advance to the end of split page */
 		blockpfn += isolated - 1;
-		cursor += isolated - 1;
+		page += isolated - 1;
 		continue;
 
 isolate_fail:
_

Patches currently in -mm which might be from shikemeng@huaweicloud.com are

mm-correct-stale-comment-of-function-check_pte.patch
mm-page_table_check-remove-unused-parameters-in-page_table_check_clear.patch
mm-page_table_check-remove-unused-parameters-in-page_table_check_set.patch
mm-page_table_check-remove-unused-parameter-in-page_table_check_pte_clear.patch
mm-page_table_check-remove-unused-parameter-in-page_table_check_pmd_clear.patch
mm-page_table_check-remove-unused-parameter-in-page_table_check_pud_clear.patch
mm-page_table_check-remove-unused-parameter-in-page_table_check_pte_set.patch
mm-page_table_check-remove-unused-parameter-in-page_table_check_pmd_set.patch
mm-page_table_check-remove-unused-parameter-in-page_table_check_pud_set.patch
mm-page_ext-remove-unused-return-value-of-offline_page_ext.patch
mm-page_ext-remove-rollback-for-untouched-mem_section-in-online_page_ext.patch
mm-page_ext-move-functions-around-for-minor-cleanups-to-page_ext.patch
mm-page_ext-add-common-function-to-get-client-data-from-page_ext.patch
mm-page_ext-use-page_ext_data-helper-in-page_table_check.patch
mm-page_ext-use-page_ext_data-helper-in-page_owner.patch
mm-rmap-correct-stale-comment-of-rmap_walk_anon-and-rmap_walk_file.patch
mm-page_poison-remove-unused-page_exth-from-page_poison.patch
mm-vmstat-remove-unused-page_exth-from-vmstat.patch
mm-page_ext-move-page_ext_operations-definition-under-config_page_extension.patch
mm-compaction-allow-blockpfn-outside-of-pageblock-for-high-order-buddy-page.patch
mm-compaction-set-compact_cached_free_pfn-correctly-in-update_pageblock_skip.patch
mm-compaction-remove-unnecessary-cursor-page-in-isolate_freepages_block.patch
mm-compaction-remove-unnecessary-else-continue-at-end-of-loop-in-isolate_freepages_block.patch