The patch titled
Subject: mm/compaction: avoid missing last page block in section after skip offline sections
has been added to the -mm mm-unstable branch. Its filename is
mm-compaction-skip-the-memory-hole-rapidly-when-isolating-free-pages-fix.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-compaction-skip-the-memory-hole-rapidly-when-isolating-free-pages-fix.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@xxxxxxxxxxxxxxx>
Subject: mm/compaction: avoid missing last page block in section after skip offline sections
Date: Fri, 4 Aug 2023 19:04:47 +0800
skip_offline_sections_reverse will return the last pfn in found online
section. Then we set block_start_pfn to start of page block which
contains the last pfn in section. Then we continue, move one page block
forward and ignore the last page block in the online section. Make
block_start_pfn point to first page block after online section to fix
this:
1. make skip_offline_sections_reverse return end pfn of online section,
i.e. pfn of page block after online section.
2. assign block_start_pfn with next_pfn.
Link: https://lkml.kernel.org/r/20230804110454.2935878-1-shikemeng@xxxxxxxxxxxxxxx
Link: https://lkml.kernel.org/r/20230804110454.2935878-2-shikemeng@xxxxxxxxxxxxxxx
Fixes: f63224525309 ("mm: compaction: skip the memory hole rapidly when isolating free pages")
Signed-off-by: Kemeng Shi <shikemeng@xxxxxxxxxxxxxxx>
Acked-by: David Hildenbrand <david@xxxxxxxxxx>
Cc: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/compaction.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
--- a/mm/compaction.c~mm-compaction-skip-the-memory-hole-rapidly-when-isolating-free-pages-fix
+++ a/mm/compaction.c
@@ -250,6 +250,11 @@ static unsigned long skip_offline_sectio
return 0;
}
+/*
+ * If the PFN falls into an offline section, return the end PFN of the
+ * next online section in reverse. If the PFN falls into an online section
+ * or if there is no next online section in reverse, return 0.
+ */
static unsigned long skip_offline_sections_reverse(unsigned long start_pfn)
{
unsigned long start_nr = pfn_to_section_nr(start_pfn);
@@ -259,7 +264,7 @@ static unsigned long skip_offline_sectio
while (start_nr-- > 0) {
if (online_section_nr(start_nr))
- return section_nr_to_pfn(start_nr) + PAGES_PER_SECTION - 1;
+ return section_nr_to_pfn(start_nr) + PAGES_PER_SECTION;
}
return 0;
@@ -1694,8 +1699,7 @@ static void isolate_freepages(struct com
next_pfn = skip_offline_sections_reverse(block_start_pfn);
if (next_pfn)
- block_start_pfn = max(pageblock_start_pfn(next_pfn),
- low_pfn);
+ block_start_pfn = max(next_pfn, low_pfn);
continue;
}
_
Patches currently in -mm which might be from shikemeng@xxxxxxxxxxxxxxx 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
