On Fri, 02 Mar 2012 10:11:18 +0400 Konstantin Khlebnikov <khlebnikov@xxxxxxxxxx> wrote: > KAMEZAWA Hiroyuki wrote: > > On Wed, 29 Feb 2012 13:15:56 +0400 > > Konstantin Khlebnikov<khlebnikov@xxxxxxxxxx> wrote: > > > >> Currently there is two types of reclaim-stat counters: > >> recent_scanned (pages picked from from lru), > >> recent_rotated (pages putted back to active lru). > >> Reclaimer uses ratio recent_rotated / recent_scanned > >> for balancing pressure between file and anon pages. > >> > >> But if we pick page from lru we can either reclaim it or put it back to lru, thus: > >> recent_scanned == recent_rotated[inactive] + recent_rotated[active] + reclaimed > >> This can be called "The Law of Conservation of Memory" =) > >> > > I'm sorry....where is the count for active->incative ? > > If reclaimer deactivates page it will bump recent_rotated[LRU_INACTIVE_ANON/FILE], > (if I understand your question right) recent_rotated[] now count each evictable lru independently > Hm, then active -> active : recent_rotated[active] += 1 active -> inactive : recent_rotated[inacitve] += 1 inactive->inactive : recent_rotated[inactive] += 1 inactive->active : recent_rotated[active] += 1 ? Ok, it seems rotated[active] + rotated[inactive] == scan. Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>