The patch titled
Subject: mm: shmem: add THP validation for PMD-mapped THP related statistics
has been added to the -mm mm-unstable branch. Its filename is
mm-shmem-add-thp-validation-for-pmd-mapped-thp-related-statistics.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-shmem-add-thp-validation-for-pmd-mapped-thp-related-statistics.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: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx>
Subject: mm: shmem: add THP validation for PMD-mapped THP related statistics
Date: Tue, 11 Jun 2024 18:11:06 +0800
In order to extend support for mTHP, add THP validation for PMD-mapped THP
related statistics to avoid statistical confusion.
Link: https://lkml.kernel.org/r/c4b04cbd51e6951cc2436a87be8eaa4a1516faec.1718090413.git.baolin.wang@xxxxxxxxxxxxxxxxx
Signed-off-by: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx>
Reviewed-by: Barry Song <v-songbaohua@xxxxxxxx>
Cc: Daniel Gomez <da.gomez@xxxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: "Huang, Ying" <ying.huang@xxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
Cc: Lance Yang <ioworker0@xxxxxxxxx>
Cc: Pankaj Raghav <p.raghav@xxxxxxxxxxx>
Cc: Ryan Roberts <ryan.roberts@xxxxxxx>
Cc: Yang Shi <shy828301@xxxxxxxxx>
Cc: Zi Yan <ziy@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/shmem.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
--- a/mm/shmem.c~mm-shmem-add-thp-validation-for-pmd-mapped-thp-related-statistics
+++ a/mm/shmem.c
@@ -1647,7 +1647,7 @@ static struct folio *shmem_alloc_and_add
return ERR_PTR(-E2BIG);
folio = shmem_alloc_folio(gfp, HPAGE_PMD_ORDER, info, index);
- if (!folio)
+ if (!folio && pages == HPAGE_PMD_NR)
count_vm_event(THP_FILE_FALLBACK);
} else {
pages = 1;
@@ -1665,7 +1665,7 @@ static struct folio *shmem_alloc_and_add
if (xa_find(&mapping->i_pages, &index,
index + pages - 1, XA_PRESENT)) {
error = -EEXIST;
- } else if (huge) {
+ } else if (pages == HPAGE_PMD_NR) {
count_vm_event(THP_FILE_FALLBACK);
count_vm_event(THP_FILE_FALLBACK_CHARGE);
}
@@ -2031,7 +2031,8 @@ repeat:
folio = shmem_alloc_and_add_folio(huge_gfp,
inode, index, fault_mm, true);
if (!IS_ERR(folio)) {
- count_vm_event(THP_FILE_ALLOC);
+ if (folio_test_pmd_mappable(folio))
+ count_vm_event(THP_FILE_ALLOC);
goto alloced;
}
if (PTR_ERR(folio) == -EEXIST)
_
Patches currently in -mm which might be from baolin.wang@xxxxxxxxxxxxxxxxx are
mm-memory-extend-finish_fault-to-support-large-folio.patch
mm-shmem-add-thp-validation-for-pmd-mapped-thp-related-statistics.patch
mm-shmem-add-multi-size-thp-sysfs-interface-for-anonymous-shmem.patch
mm-shmem-add-mthp-support-for-anonymous-shmem.patch
mm-shmem-add-mthp-size-alignment-in-shmem_get_unmapped_area.patch
mm-shmem-add-mthp-counters-for-anonymous-shmem.patch
