per-zone and reclaim enhancements for memory controller: calculate the number of pages to be scanned per cgroup
Define function for calculating the number of scan target on each Zone/LRU. Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Balbir Singh <balbir@linux.vnet.ibm.com> Cc: David Rientjes <rientjes@google.com> Cc: Herbert Poetzl <herbert@13thfloor.at> Cc: Kirill Korotaev <dev@sw.ru> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Cc: Paul Menage <menage@google.com> Cc: Pavel Emelianov <xemul@openvz.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com> Cc: Rik van Riel <riel@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -76,6 +76,10 @@ extern void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem,
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extern void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem,
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int priority);
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extern long mem_cgroup_calc_reclaim_active(struct mem_cgroup *mem,
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struct zone *zone, int priority);
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extern long mem_cgroup_calc_reclaim_inactive(struct mem_cgroup *mem,
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struct zone *zone, int priority);
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#else /* CONFIG_CGROUP_MEM_CONT */
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static inline void mm_init_cgroup(struct mm_struct *mm,
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@ -173,6 +177,17 @@ static inline void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem,
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{
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}
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static inline long mem_cgroup_calc_reclaim_active(struct mem_cgroup *mem,
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struct zone *zone, int priority)
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{
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return 0;
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}
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static inline long mem_cgroup_calc_reclaim_inactive(struct mem_cgroup *mem,
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struct zone *zone, int priority)
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{
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return 0;
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}
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#endif /* CONFIG_CGROUP_MEM_CONT */
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#endif /* _LINUX_MEMCONTROL_H */
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@ -471,6 +471,39 @@ void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem, int priority)
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mem->prev_priority = priority;
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}
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/*
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* Calculate # of pages to be scanned in this priority/zone.
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* See also vmscan.c
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*
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* priority starts from "DEF_PRIORITY" and decremented in each loop.
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* (see include/linux/mmzone.h)
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*/
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long mem_cgroup_calc_reclaim_active(struct mem_cgroup *mem,
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struct zone *zone, int priority)
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{
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long nr_active;
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int nid = zone->zone_pgdat->node_id;
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int zid = zone_idx(zone);
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struct mem_cgroup_per_zone *mz = mem_cgroup_zoneinfo(mem, nid, zid);
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nr_active = MEM_CGROUP_ZSTAT(mz, MEM_CGROUP_ZSTAT_ACTIVE);
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return (nr_active >> priority);
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}
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long mem_cgroup_calc_reclaim_inactive(struct mem_cgroup *mem,
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struct zone *zone, int priority)
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{
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long nr_inactive;
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int nid = zone->zone_pgdat->node_id;
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int zid = zone_idx(zone);
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struct mem_cgroup_per_zone *mz = mem_cgroup_zoneinfo(mem, nid, zid);
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nr_inactive = MEM_CGROUP_ZSTAT(mz, MEM_CGROUP_ZSTAT_INACTIVE);
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return (nr_inactive >> priority);
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}
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unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan,
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struct list_head *dst,
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unsigned long *scanned, int order,
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