From: Baolin Wang <baolin.wang@linux.alibaba.com>
To: akpm@linux-foundation.org, hughd@google.com, david@kernel.org
Cc: ziy@nvidia.com, liam@infradead.org, nico.pache@linux.dev,
ryan.roberts@arm.com, dev.jain@arm.com, baohua@kernel.org,
lance.yang@linux.dev, usama.arif@linux.dev, kas@kernel.org,
ljs@kernel.org, baolin.wang@linux.alibaba.com,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: [PATCH 07/12] mm: khugepaged: add an order check for PMD-sized THP statistics
Date: Fri, 18 Sep 2026 11:58:38 +0800 [thread overview]
Message-ID: <880d5e981b8af49f956cea49074ef6dc553a575a.1789701677.git.baolin.wang@linux.alibaba.com> (raw)
In-Reply-To: <cover.1789701677.git.baolin.wang@linux.alibaba.com>
In order to support shmem mTHP collapse in the following patches, add
an PMD-sized THP order check to avoid PMD-sized THP statistics errors.
No functional changes.
Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com>
---
mm/khugepaged.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index a987d233ec47..6c648ede24c4 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -2518,8 +2518,9 @@ static enum scan_result collapse_file(struct mm_struct *mm, unsigned long addr,
if (is_shmem) {
lruvec_stat_mod_folio(new_folio, NR_SHMEM, nr_pages);
- lruvec_stat_mod_folio(new_folio, NR_SHMEM_THPS, HPAGE_PMD_NR);
- } else {
+ if (is_pmd_order(order))
+ lruvec_stat_mod_folio(new_folio, NR_SHMEM_THPS, HPAGE_PMD_NR);
+ } else if (is_pmd_order(order)) {
lruvec_stat_mod_folio(new_folio, NR_FILE_THPS, HPAGE_PMD_NR);
}
lruvec_stat_mod_folio(new_folio, NR_FILE_PAGES, nr_pages);
--
2.47.3
next prev parent reply other threads:[~2026-09-18 3:58 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-18 3:58 [PATCH 00/12] add shmem mTHP collapse support Baolin Wang
2026-09-18 3:58 ` [PATCH 01/12] mm: khugepaged: remove outdated comments and check for shmem Baolin Wang
2026-09-18 5:31 ` Barry Song
2026-09-18 3:58 ` [PATCH 02/12] mm: khugepaged: drop the hugepage_madvise() Baolin Wang
2026-09-18 5:33 ` Barry Song
2026-09-18 3:58 ` [PATCH 03/12] mm: shmem: don't expose 'deny' and 'force' via the kernel command line Baolin Wang
2026-09-18 5:45 ` Barry Song
2026-09-18 8:31 ` Baolin Wang
2026-09-18 3:58 ` [PATCH 04/12] mm: khugepaged: move cc->scan_file and cc->scan_pgoff assignment into collapse_scan_file() Baolin Wang
2026-09-18 3:58 ` [PATCH 05/12] mm: khugepaged: add max_ptes_none check in collapse_file() Baolin Wang
2026-09-18 3:58 ` [PATCH 06/12] mm: khugepaged: generalize collapse_file() for shmem mTHP support Baolin Wang
2026-09-18 3:58 ` Baolin Wang [this message]
2026-09-18 3:58 ` [PATCH 08/12] mm: khugepaged: add a helper to get the minimal collapse order Baolin Wang
2026-09-18 3:58 ` [PATCH 09/12] mm: khugepaged: add shmem mTHP collapse support Baolin Wang
2026-09-18 3:58 ` [PATCH 10/12] mm: shmem: run khugepaged for all shmem mTHP orders Baolin Wang
2026-09-18 3:58 ` [PATCH 11/12] mm: khugepaged: allow khugepaged to check all shmem mTHP-sized orders Baolin Wang
2026-09-18 3:58 ` [PATCH 12/12] selftests: mm: add shmem mTHP collapse test cases Baolin Wang
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