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mm: shmem: add THP validation for PMD-mapped THP related statistics

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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@linux.alibaba.com
Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Reviewed-by: Barry Song <v-songbaohua@oppo.com>
Cc: Daniel Gomez <da.gomez@samsung.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: "Huang, Ying" <ying.huang@intel.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Lance Yang <ioworker0@gmail.com>
Cc: Pankaj Raghav <p.raghav@samsung.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Yang Shi <shy828301@gmail.com>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Baolin Wang 2024-06-11 18:11:06 +08:00 committed by Andrew Morton
parent 43e027e414
commit 3d95bc21ce
1 changed files with 4 additions and 3 deletions
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7
mm/shmem.c
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@ -1647,7 +1647,7 @@ static struct folio *shmem_alloc_and_add_folio(gfp_t gfp,
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_folio(gfp_t gfp,
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)