The quilt patch titled
Subject: mm: page_alloc: consolidate free page accounting fix 3
has been removed from the -mm tree. Its filename was
mm-page_alloc-consolidate-free-page-accounting-fix-3.patch
This patch was dropped because it was folded into mm-page_alloc-consolidate-free-page-accounting.patch
------------------------------------------------------
From: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx>
Subject: mm: page_alloc: consolidate free page accounting fix 3
Date: Tue, 9 Apr 2024 15:48:04 +0800
If the released page is captured by compaction, now the free page accounting
is not correspondingly decreased, which can make the watermark checks false
positive and result in depleted reserves etc. And I can see the false positive
watermark checks in thpcompact benchmark, that led to a slight regression:
thpcompact Percentage Faults Huge
k6.9-rc2-base base + patch10 + 2 fixes
Percentage huge-1 78.18 ( 0.00%) 71.92 ( -8.01%)
Percentage huge-3 86.70 ( 0.00%) 86.07 ( -0.73%)
Percentage huge-5 90.26 ( 0.00%) 78.02 ( -13.57%)
Percentage huge-7 92.34 ( 0.00%) 78.67 ( -14.81%)
Percentage huge-12 91.18 ( 0.00%) 81.04 ( -11.12%)
Percentage huge-18 89.00 ( 0.00%) 79.57 ( -10.60%)
Percentage huge-24 90.52 ( 0.00%) 80.07 ( -11.54%)
Percentage huge-30 94.44 ( 0.00%) 96.28 ( 1.95%)
Percentage huge-32 93.09 ( 0.00%) 99.39 ( 6.77%)
After the fix, the regression is gone.
Link: https://lkml.kernel.org/r/a2a48baca69f103aa431fd201f8a06e3b95e203d.1712648441.git.baolin.wang@xxxxxxxxxxxxxxxxx
Signed-off-by: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx>
Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx>
Acked-by: Vlastimil Babka <vbabka@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_alloc.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/mm/page_alloc.c~mm-page_alloc-consolidate-free-page-accounting-fix-3
+++ a/mm/page_alloc.c
@@ -805,8 +805,10 @@ static inline void __free_one_page(struc
while (order < MAX_PAGE_ORDER) {
int buddy_mt = migratetype;
- if (compaction_capture(capc, page, order, migratetype))
+ if (compaction_capture(capc, page, order, migratetype)) {
+ account_freepages(zone, -(1 << order), migratetype);
return;
+ }
buddy = find_buddy_page_pfn(page, pfn, order, &buddy_pfn);
if (!buddy)
_
Patches currently in -mm which might be from baolin.wang@xxxxxxxxxxxxxxxxx are
mm-page_alloc-consolidate-free-page-accounting.patch
mm-record-the-migration-reason-for-struct-migration_target_control.patch
mm-hugetlb-make-the-hugetlb-migration-strategy-consistent.patch
docs-hugetlbpagerst-add-hugetlb-migration-description.patch
mm-factor-out-the-numa-mapping-rebuilding-into-a-new-helper.patch
mm-support-multi-size-thp-numa-balancing.patch
mm-support-multi-size-thp-numa-balancing-v3.patch
mm-huge_memory-add-the-missing-folio_test_pmd_mappable-for-thp-split-statistics.patch
mm-huge_memory-add-the-missing-folio_test_pmd_mappable-for-thp-split-statistics-v2.patch
mm-page_alloc-use-the-correct-thp-order-for-thp-pcp.patch
mm-set-pageblock_order-to-hpage_pmd_order-in-case-with-config_hugetlb_page-but-thp-enabled.patch
mm-page_alloc-allowing-mthp-compaction-to-capture-the-freed-page-directly.patch
