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    Subject[PATCHv5 10/28] mm, vmstats: new THP splitting event
    Date
    The patch replaces THP_SPLIT with tree events: THP_SPLIT_PAGE,
    THP_SPLIT_PAGE_FAILT and THP_SPLIT_PMD. It reflects the fact that we
    are going to be able split PMD without the compound page and that
    split_huge_page() can fail.

    Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
    Acked-by: Christoph Lameter <cl@linux.com>
    Tested-by: Sasha Levin <sasha.levin@oracle.com>
    ---
    include/linux/vm_event_item.h | 4 +++-
    mm/huge_memory.c | 2 +-
    mm/vmstat.c | 4 +++-
    3 files changed, 7 insertions(+), 3 deletions(-)

    diff --git a/include/linux/vm_event_item.h b/include/linux/vm_event_item.h
    index 2b1cef88b827..3261bfe2156a 100644
    --- a/include/linux/vm_event_item.h
    +++ b/include/linux/vm_event_item.h
    @@ -69,7 +69,9 @@ enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
    THP_FAULT_FALLBACK,
    THP_COLLAPSE_ALLOC,
    THP_COLLAPSE_ALLOC_FAILED,
    - THP_SPLIT,
    + THP_SPLIT_PAGE,
    + THP_SPLIT_PAGE_FAILED,
    + THP_SPLIT_PMD,
    THP_ZERO_PAGE_ALLOC,
    THP_ZERO_PAGE_ALLOC_FAILED,
    #endif
    diff --git a/mm/huge_memory.c b/mm/huge_memory.c
    index ccbfacf07160..be6d0e0f5050 100644
    --- a/mm/huge_memory.c
    +++ b/mm/huge_memory.c
    @@ -1961,7 +1961,7 @@ int split_huge_page_to_list(struct page *page, struct list_head *list)

    BUG_ON(!PageSwapBacked(page));
    __split_huge_page(page, anon_vma, list);
    - count_vm_event(THP_SPLIT);
    + count_vm_event(THP_SPLIT_PAGE);

    BUG_ON(PageCompound(page));
    out_unlock:
    diff --git a/mm/vmstat.c b/mm/vmstat.c
    index 1fd0886a389f..e1c87425fe11 100644
    --- a/mm/vmstat.c
    +++ b/mm/vmstat.c
    @@ -821,7 +821,9 @@ const char * const vmstat_text[] = {
    "thp_fault_fallback",
    "thp_collapse_alloc",
    "thp_collapse_alloc_failed",
    - "thp_split",
    + "thp_split_page",
    + "thp_split_page_failed",
    + "thp_split_pmd",
    "thp_zero_page_alloc",
    "thp_zero_page_alloc_failed",
    #endif
    --
    2.1.4


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