On Thu, Mar 24, 2022 at 10:43:33AM +0000, cgel.zte@xxxxxxxxx wrote: > +++ b/include/linux/vm_event_item.h > @@ -131,6 +131,7 @@ enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT, > SWAP_RA_HIT, > #ifdef CONFIG_KSM > KSM_SWPIN_COPY, > + COW_KSM, Shouldn't we call this KSM_COW? > +++ b/mm/vmstat.c > @@ -1390,6 +1390,7 @@ const char * const vmstat_text[] = { > "swap_ra_hit", > #ifdef CONFIG_KSM > "ksm_swpin_copy", > + "cow_ksm", ... and this "ksm_cow"?