+ mm-page_alloc-remove-track-of-active-pcp-lists-range-in-bulk-free.patch added to mm-unstable branch

+ mm-page_alloc-remove-track-of-active-pcp-lists-range-in-bulk-free.patch added to mm-unstable branch

[Andrew Morton]

The patch titled
     Subject: mm/page_alloc: remove track of active PCP lists range in bulk free
has been added to the -mm mm-unstable branch.  Its filename is
     mm-page_alloc-remove-track-of-active-pcp-lists-range-in-bulk-free.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-page_alloc-remove-track-of-active-pcp-lists-range-in-bulk-free.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/page_alloc: remove track of active PCP lists range in bulk free
Date: Wed, 9 Aug 2023 18:07:53 +0800

Patch series "Two minor cleanups for pcp list in page_alloc".

There are two minor cleanups for pcp list in page_alloc. More details
can be found in respective patches.


This patch (of 2):

After commit fd56eef258a17 ("mm/page_alloc: simplify how many pages are
selected per pcp list during bulk free"), we will drain all pages in
selected pcp list.  And we ensured passed count is < pcp->count.  Then,
the search will finish before wrap-around and track of active PCP lists
range intended for wrap-around case is no longer needed.

Link: https://lkml.kernel.org/r/20230809100754.3094517-1-shikemeng@huaweicloud.com
Link: https://lkml.kernel.org/r/20230809100754.3094517-2-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: Matthew Wilcox <willy@infradead.org>
Cc: Mel Gorman <mgorman@techsingularity.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/page_alloc.c |   15 +++------------
 1 file changed, 3 insertions(+), 12 deletions(-)

--- a/mm/page_alloc.c~mm-page_alloc-remove-track-of-active-pcp-lists-range-in-bulk-free
+++ a/mm/page_alloc.c
@@ -1207,8 +1207,6 @@ static void free_pcppages_bulk(struct zo
 					int pindex)
 {
 	unsigned long flags;
-	int min_pindex = 0;
-	int max_pindex = NR_PCP_LISTS - 1;
 	unsigned int order;
 	bool isolated_pageblocks;
 	struct page *page;
@@ -1231,17 +1229,10 @@ static void free_pcppages_bulk(struct zo
 
 		/* Remove pages from lists in a round-robin fashion. */
 		do {
-			if (++pindex > max_pindex)
-				pindex = min_pindex;
+			if (++pindex > NR_PCP_LISTS - 1)
+				pindex = 0;
 			list = &pcp->lists[pindex];
-			if (!list_empty(list))
-				break;
-
-			if (pindex == max_pindex)
-				max_pindex--;
-			if (pindex == min_pindex)
-				min_pindex++;
-		} while (1);
+		} while (list_empty(list));
 
 		order = pindex_to_order(pindex);
 		nr_pages = 1 << order;
_

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

mm-correct-stale-comment-of-function-check_pte.patch
mm-compaction-skip-the-memory-hole-rapidly-when-isolating-free-pages-fix.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-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
mm-compaction-correct-last_migrated_pfn-update-in-compact_zone.patch
mm-compaction-skip-page-block-marked-skip-in-isolate_migratepages_block.patch
mm-compaction-correct-comment-of-fast_find_migrateblock-in-isolate_migratepages.patch
mm-compaction-correct-comment-of-cached-migrate-pfn-update.patch
mm-compaction-correct-comment-to-complete-migration-failure.patch
mm-compaction-remove-unnecessary-return-for-void-function.patch
mm-compaction-only-set-skip-flag-if-cc-no_set_skip_hint-is-false.patch
mm-page_alloc-remove-track-of-active-pcp-lists-range-in-bulk-free.patch
mm-page_alloc-remove-unnecessary-parameter-batch-of-nr_pcp_free.patch