cgel.zte@xxxxxxxxx writes:
> From: Yang Yang <yang.yang29@xxxxxxxxxx>
>
> There are interfaces to adjust max_ptes_none, max_ptes_swap,
> max_ptes_shared values, see
> /sys/kernel/mm/transparent_hugepage/khugepaged/.
>
> But system administrator maynot know which value is the best. So
> Add those events to support adjusting max_ptes_* to suitable values.
>
> For example, if default max_ptes_swap value causes too much failures,
> and system uses zram whose IO is fast, administrator could increase
> max_ptes_swap until THP_SCAN_EXCEED_SWAP_PTE not increase anymore.
>
> Signed-off-by: Yang Yang <yang.yang29@xxxxxxxxxx>
> ---
> include/linux/vm_event_item.h | 3 +++
> mm/khugepaged.c | 7 +++++++
> mm/vmstat.c | 3 +++
> 3 files changed, 13 insertions(+)
>
> diff --git a/include/linux/vm_event_item.h b/include/linux/vm_event_item.h
> index a185cc75ff52..7b2363388bfa 100644
> --- a/include/linux/vm_event_item.h
> +++ b/include/linux/vm_event_item.h
> @@ -98,6 +98,9 @@ enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
> THP_SPLIT_PAGE_FAILED,
> THP_DEFERRED_SPLIT_PAGE,
> THP_SPLIT_PMD,
> + THP_SCAN_EXCEED_NONE_PTE,
> + THP_SCAN_EXCEED_SWAP_PTE,
> + THP_SCAN_EXCEED_SHARED_PTE,
"SCAN" appears too general, how about
THP_COLLAPSE_EXCEED_SWAP_PTE
?
Best Regards,
Huang, Ying
[snip]
