Move local variables to innermost possible scopes and use local variables to cache calculations/reads done more than once. No change in functionality (intended). Signed-off-by: Johannes Weiner --- mm/vmscan.c | 23 +++++++++++------------ 1 file changed, 11 insertions(+), 12 deletions(-) --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -2057,31 +2057,31 @@ static unsigned long shrink_all_zones(un int pass, struct scan_control *sc) { struct zone *zone; - unsigned long nr_to_scan, ret = 0; - enum lru_list l; + unsigned long ret = 0; for_each_zone(zone) { + enum lru_list l; if (!populated_zone(zone)) continue; - if (zone_is_all_unreclaimable(zone) && prio != DEF_PRIORITY) continue; for_each_evictable_lru(l) { + enum zone_stat_item ls = NR_LRU_BASE + l; + unsigned long lru_pages = zone_page_state(zone, ls); + /* For pass = 0, we don't shrink the active list */ - if (pass == 0 && - (l == LRU_ACTIVE || l == LRU_ACTIVE_FILE)) + if (pass == 0 && (l == LRU_ACTIVE_ANON || + l == LRU_ACTIVE_FILE)) continue; - zone->lru[l].nr_scan += - (zone_page_state(zone, NR_LRU_BASE + l) - >> prio) + 1; + zone->lru[l].nr_scan += (lru_pages >> prio) + 1; if (zone->lru[l].nr_scan >= nr_pages || pass > 3) { + unsigned long nr_to_scan; + zone->lru[l].nr_scan = 0; - nr_to_scan = min(nr_pages, - zone_page_state(zone, - NR_LRU_BASE + l)); + nr_to_scan = min(nr_pages, lru_pages); ret += shrink_list(l, nr_to_scan, zone, sc, prio); if (ret >= nr_pages) @@ -2089,7 +2089,6 @@ static unsigned long shrink_all_zones(un } } } - return ret; } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/