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| author |   Liu Shixin <liushixin2@huawei.com> | 2022-09-09 10:16:53 +0800 |
|---|---|---|
| committer |   Andrew Morton <akpm@linux-foundation.org> | 2022-10-03 14:03:08 -0700 |
| commit | f4981502088f8ea704beeedf3470e1d53bc2e46c (patch) | |
| tree | 01f5ad21737aabffcb9948a10fdf9aa5f4123c76 /Documentation/admin-guide | |
| parent | writeback: remove unused macro DIRTY_FULL_SCOPE (diff) | |
| download | linux-dev-f4981502088f8ea704beeedf3470e1d53bc2e46c.tar.xz linux-dev-f4981502088f8ea704beeedf3470e1d53bc2e46c.zip | |
mm/huge_memory: prevent THP_ZERO_PAGE_ALLOC increased twice
A user who reads THP_ZERO_PAGE_ALLOC may be more concerned about the huge
zero pages that are really allocated for thp. It is misleading to
increase THP_ZERO_PAGE_ALLOC twice if two threads call get_huge_zero_page
concurrently. Don't increase the value if the huge page is not really
used.
Update Documentation/admin-guide/mm/transhuge.rst to suit.
Link: https://lkml.kernel.org/r/20220909021653.3371879-1-liushixin2@huawei.com
Signed-off-by: Liu Shixin <liushixin2@huawei.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'Documentation/admin-guide')
| -rw-r--r-- | Documentation/admin-guide/mm/transhuge.rst | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/Documentation/admin-guide/mm/transhuge.rst b/Documentation/admin-guide/mm/transhuge.rst index c9c37f16eef8..8e3418ec4503 100644 --- a/Documentation/admin-guide/mm/transhuge.rst +++ b/Documentation/admin-guide/mm/transhuge.rst @@ -366,10 +366,9 @@ thp_split_pmd page table entry. thp_zero_page_alloc - is incremented every time a huge zero page is - successfully allocated. It includes allocations which where - dropped due race with other allocation. Note, it doesn't count - every map of the huge zero page, only its allocation. + is incremented every time a huge zero page used for thp is + successfully allocated. Note, it doesn't count every map of + the huge zero page, only its allocation. thp_zero_page_alloc_failed is incremented if kernel fails to allocate |