Messages in this thread Patch in this message | | | From | KOSAKI Motohiro <> | Subject | [PATCH] mm: remove zone->prev_prioriy | Date | Tue, 10 Feb 2009 18:42:30 +0900 (JST) |
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KAMEZAWA Hiroyuki sugessted to remove zone->prev_priority. it's because Split-LRU VM doesn't use this parameter at all.
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> --- include/linux/memcontrol.h | 27 ------------------------- include/linux/mmzone.h | 15 -------------- mm/memcontrol.c | 31 ----------------------------- mm/page_alloc.c | 2 - mm/vmscan.c | 48 ++------------------------------------------- mm/vmstat.c | 2 - 6 files changed, 3 insertions(+), 122 deletions(-)
Index: b/mm/memcontrol.c =================================================================== --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -150,8 +150,6 @@ struct mem_cgroup { */ spinlock_t reclaim_param_lock; - int prev_priority; /* for recording reclaim priority */ - /* * While reclaiming in a hiearchy, we cache the last child we * reclaimed from. Protected by hierarchy_mutex @@ -464,35 +462,6 @@ int mem_cgroup_calc_mapped_ratio(struct return (int)((rss * 100L) / total); } -/* - * prev_priority control...this will be used in memory reclaim path. - */ -int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem) -{ - int prev_priority; - - spin_lock(&mem->reclaim_param_lock); - prev_priority = mem->prev_priority; - spin_unlock(&mem->reclaim_param_lock); - - return prev_priority; -} - -void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem, int priority) -{ - spin_lock(&mem->reclaim_param_lock); - if (priority < mem->prev_priority) - mem->prev_priority = priority; - spin_unlock(&mem->reclaim_param_lock); -} - -void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem, int priority) -{ - spin_lock(&mem->reclaim_param_lock); - mem->prev_priority = priority; - spin_unlock(&mem->reclaim_param_lock); -} - static int calc_inactive_ratio(struct mem_cgroup *memcg, unsigned long *present_pages) { unsigned long active; Index: b/mm/vmscan.c =================================================================== --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -1174,20 +1174,6 @@ done: } /* - * We are about to scan this zone at a certain priority level. If that priority - * level is smaller (ie: more urgent) than the previous priority, then note - * that priority level within the zone. This is done so that when the next - * process comes in to scan this zone, it will immediately start out at this - * priority level rather than having to build up its own scanning priority. - * Here, this priority affects only the reclaim-mapped threshold. - */ -static inline void note_zone_scanning_priority(struct zone *zone, int priority) -{ - if (priority < zone->prev_priority) - zone->prev_priority = priority; -} - -/* * This moves pages from the active list to the inactive list. * * We move them the other way if the page is referenced by one or more @@ -1553,22 +1539,18 @@ static void shrink_zones(int priority, s if (scanning_global_lru(sc)) { if (!cpuset_zone_allowed_hardwall(zone, GFP_KERNEL)) continue; - note_zone_scanning_priority(zone, priority); if (zone_is_all_unreclaimable(zone) && priority != DEF_PRIORITY) continue; /* Let kswapd poll it */ - sc->all_unreclaimable = 0; + } else { /* * Ignore cpuset limitation here. We just want to reduce * # of used pages by us regardless of memory shortage. */ - sc->all_unreclaimable = 0; - mem_cgroup_note_reclaim_priority(sc->mem_cgroup, - priority); } - + sc->all_unreclaimable = 0; shrink_zone(priority, zone, sc); } } @@ -1676,11 +1658,8 @@ out: if (!cpuset_zone_allowed_hardwall(zone, GFP_KERNEL)) continue; - - zone->prev_priority = priority; } - } else - mem_cgroup_record_reclaim_priority(sc->mem_cgroup, priority); + } delayacct_freepages_end(); @@ -1769,11 +1748,6 @@ static unsigned long balance_pgdat(pg_da .mem_cgroup = NULL, .isolate_pages = isolate_pages_global, }; - /* - * temp_priority is used to remember the scanning priority at which - * this zone was successfully refilled to free_pages == pages_high. - */ - int temp_priority[MAX_NR_ZONES]; loop_again: total_scanned = 0; @@ -1781,9 +1755,6 @@ loop_again: sc.may_writepage = !laptop_mode; count_vm_event(PAGEOUTRUN); - for (i = 0; i < pgdat->nr_zones; i++) - temp_priority[i] = DEF_PRIORITY; - for (priority = DEF_PRIORITY; priority >= 0; priority--) { int end_zone = 0; /* Inclusive. 0 = ZONE_DMA */ unsigned long lru_pages = 0; @@ -1854,9 +1825,7 @@ loop_again: if (!zone_watermark_ok(zone, order, zone->pages_high, end_zone, 0)) all_zones_ok = 0; - temp_priority[i] = priority; sc.nr_scanned = 0; - note_zone_scanning_priority(zone, priority); /* * We put equal pressure on every zone, unless one * zone has way too many pages free already. @@ -1903,16 +1872,6 @@ loop_again: break; } out: - /* - * Note within each zone the priority level at which this zone was - * brought into a happy state. So that the next thread which scans this - * zone will start out at that priority level. - */ - for (i = 0; i < pgdat->nr_zones; i++) { - struct zone *zone = pgdat->node_zones + i; - - zone->prev_priority = temp_priority[i]; - } if (!all_zones_ok) { cond_resched(); @@ -2321,7 +2280,6 @@ static int __zone_reclaim(struct zone *z */ priority = ZONE_RECLAIM_PRIORITY; do { - note_zone_scanning_priority(zone, priority); shrink_zone(priority, zone, &sc); priority--; } while (priority >= 0 && sc.nr_reclaimed < nr_pages); Index: b/include/linux/mmzone.h =================================================================== --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -337,21 +337,6 @@ struct zone { atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS]; /* - * prev_priority holds the scanning priority for this zone. It is - * defined as the scanning priority at which we achieved our reclaim - * target at the previous try_to_free_pages() or balance_pgdat() - * invokation. - * - * We use prev_priority as a measure of how much stress page reclaim is - * under - it drives the swappiness decision: whether to unmap mapped - * pages. - * - * Access to both this field is quite racy even on uniprocessor. But - * it is expected to average out OK. - */ - int prev_priority; - - /* * The target ratio of ACTIVE_ANON to INACTIVE_ANON pages on * this zone's LRU. Maintained by the pageout code. */ Index: b/mm/page_alloc.c =================================================================== --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -3516,8 +3516,6 @@ static void __paginginit free_area_init_ zone_seqlock_init(zone); zone->zone_pgdat = pgdat; - zone->prev_priority = DEF_PRIORITY; - zone_pcp_init(zone); for_each_lru(l) { INIT_LIST_HEAD(&zone->lru[l].list); Index: b/mm/vmstat.c =================================================================== --- a/mm/vmstat.c +++ b/mm/vmstat.c @@ -775,11 +775,9 @@ static void zoneinfo_show_print(struct s } seq_printf(m, "\n all_unreclaimable: %u" - "\n prev_priority: %i" "\n start_pfn: %lu" "\n inactive_ratio: %u", zone_is_all_unreclaimable(zone), - zone->prev_priority, zone->zone_start_pfn, zone->inactive_ratio); seq_putc(m, '\n'); Index: b/include/linux/memcontrol.h =================================================================== --- a/include/linux/memcontrol.h +++ b/include/linux/memcontrol.h @@ -88,14 +88,7 @@ extern void mem_cgroup_end_migration(str /* * For memory reclaim. */ -extern int mem_cgroup_calc_mapped_ratio(struct mem_cgroup *mem); extern long mem_cgroup_reclaim_imbalance(struct mem_cgroup *mem); - -extern int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem); -extern void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem, - int priority); -extern void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem, - int priority); int mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg); unsigned long mem_cgroup_zone_nr_pages(struct mem_cgroup *memcg, struct zone *zone, @@ -209,31 +202,11 @@ static inline void mem_cgroup_end_migrat { } -static inline int mem_cgroup_calc_mapped_ratio(struct mem_cgroup *mem) -{ - return 0; -} - static inline int mem_cgroup_reclaim_imbalance(struct mem_cgroup *mem) { return 0; } -static inline int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem) -{ - return 0; -} - -static inline void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem, - int priority) -{ -} - -static inline void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem, - int priority) -{ -} - static inline bool mem_cgroup_disabled(void) { return true;
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