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    Subject[PATCH v10 23/25] mm: add speculative page fault vmstats
    Date
    Add speculative_pgfault vmstat counter to count successful speculative page
    fault handling.

    Also fixing a minor typo in include/linux/vm_event_item.h.

    Signed-off-by: Laurent Dufour <ldufour@linux.vnet.ibm.com>
    ---
    include/linux/vm_event_item.h | 3 +++
    mm/memory.c | 1 +
    mm/vmstat.c | 5 ++++-
    3 files changed, 8 insertions(+), 1 deletion(-)

    diff --git a/include/linux/vm_event_item.h b/include/linux/vm_event_item.h
    index 5c7f010676a7..a240acc09684 100644
    --- a/include/linux/vm_event_item.h
    +++ b/include/linux/vm_event_item.h
    @@ -111,6 +111,9 @@ enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
    SWAP_RA,
    SWAP_RA_HIT,
    #endif
    +#ifdef CONFIG_SPECULATIVE_PAGE_FAULT
    + SPECULATIVE_PGFAULT,
    +#endif
    NR_VM_EVENT_ITEMS
    };

    diff --git a/mm/memory.c b/mm/memory.c
    index 425f07e0bf38..1cd5bc000643 100644
    --- a/mm/memory.c
    +++ b/mm/memory.c
    @@ -4508,6 +4508,7 @@ int __handle_speculative_fault(struct mm_struct *mm, unsigned long address,
    * If there is no need to retry, don't return the vma to the caller.
    */
    if (ret != VM_FAULT_RETRY) {
    + count_vm_event(SPECULATIVE_PGFAULT);
    put_vma(vmf.vma);
    *vma = NULL;
    }
    diff --git a/mm/vmstat.c b/mm/vmstat.c
    index 536332e988b8..c6b49bfa8139 100644
    --- a/mm/vmstat.c
    +++ b/mm/vmstat.c
    @@ -1289,7 +1289,10 @@ const char * const vmstat_text[] = {
    "swap_ra",
    "swap_ra_hit",
    #endif
    -#endif /* CONFIG_VM_EVENTS_COUNTERS */
    +#ifdef CONFIG_SPECULATIVE_PAGE_FAULT
    + "speculative_pgfault"
    +#endif
    +#endif /* CONFIG_VM_EVENT_COUNTERS */
    };
    #endif /* CONFIG_PROC_FS || CONFIG_SYSFS || CONFIG_NUMA */

    --
    2.7.4
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