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Subject[PATCH v3 01/21] memcg: unify inactive_ratio calculation
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This patch removes precalculated zone->inactive_ratio.
Now it always calculated in inactive_anon_is_low() from current lru sizes.
After that we can merge memcg and non-memcg cases and drop duplicated code.

Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
---
include/linux/memcontrol.h | 16 --------
include/linux/mmzone.h | 7 ----
mm/memcontrol.c | 38 -------------------
mm/page_alloc.c | 44 ----------------------
mm/vmscan.c | 88 ++++++++++++++++++++++++++++----------------
mm/vmstat.c | 6 +--
6 files changed, 58 insertions(+), 141 deletions(-)

diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index bf4e1f4..8c4d74f 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -113,10 +113,6 @@ void mem_cgroup_iter_break(struct mem_cgroup *, struct mem_cgroup *);
/*
* For memory reclaim.
*/
-int mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg,
- struct zone *zone);
-int mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg,
- struct zone *zone);
int mem_cgroup_select_victim_node(struct mem_cgroup *memcg);
unsigned long mem_cgroup_zone_nr_lru_pages(struct mem_cgroup *memcg,
int nid, int zid, unsigned int lrumask);
@@ -319,18 +315,6 @@ static inline bool mem_cgroup_disabled(void)
return true;
}

-static inline int
-mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg, struct zone *zone)
-{
- return 1;
-}
-
-static inline int
-mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg, struct zone *zone)
-{
- return 1;
-}
-
static inline unsigned long
mem_cgroup_zone_nr_lru_pages(struct mem_cgroup *memcg, int nid, int zid,
unsigned int lru_mask)
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index f10a54c..3e1f7ff 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -382,13 +382,6 @@ struct zone {
/* Zone statistics */
atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS];

- /*
- * The target ratio of ACTIVE_ANON to INACTIVE_ANON pages on
- * this zone's LRU. Maintained by the pageout code.
- */
- unsigned int inactive_ratio;
-
-
ZONE_PADDING(_pad2_)
/* Rarely used or read-mostly fields */

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index ab315ab..b8039d2 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1157,44 +1157,6 @@ int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *memcg)
return ret;
}

-int mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg, struct zone *zone)
-{
- unsigned long inactive_ratio;
- int nid = zone_to_nid(zone);
- int zid = zone_idx(zone);
- unsigned long inactive;
- unsigned long active;
- unsigned long gb;
-
- inactive = mem_cgroup_zone_nr_lru_pages(memcg, nid, zid,
- BIT(LRU_INACTIVE_ANON));
- active = mem_cgroup_zone_nr_lru_pages(memcg, nid, zid,
- BIT(LRU_ACTIVE_ANON));
-
- gb = (inactive + active) >> (30 - PAGE_SHIFT);
- if (gb)
- inactive_ratio = int_sqrt(10 * gb);
- else
- inactive_ratio = 1;
-
- return inactive * inactive_ratio < active;
-}
-
-int mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg, struct zone *zone)
-{
- unsigned long active;
- unsigned long inactive;
- int zid = zone_idx(zone);
- int nid = zone_to_nid(zone);
-
- inactive = mem_cgroup_zone_nr_lru_pages(memcg, nid, zid,
- BIT(LRU_INACTIVE_FILE));
- active = mem_cgroup_zone_nr_lru_pages(memcg, nid, zid,
- BIT(LRU_ACTIVE_FILE));
-
- return (active > inactive);
-}
-
struct zone_reclaim_stat *mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg,
struct zone *zone)
{
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index a547177..38f6744 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5051,49 +5051,6 @@ void setup_per_zone_wmarks(void)
}

/*
- * The inactive anon list should be small enough that the VM never has to
- * do too much work, but large enough that each inactive page has a chance
- * to be referenced again before it is swapped out.
- *
- * The inactive_anon ratio is the target ratio of ACTIVE_ANON to
- * INACTIVE_ANON pages on this zone's LRU, maintained by the
- * pageout code. A zone->inactive_ratio of 3 means 3:1 or 25% of
- * the anonymous pages are kept on the inactive list.
- *
- * total target max
- * memory ratio inactive anon
- * -------------------------------------
- * 10MB 1 5MB
- * 100MB 1 50MB
- * 1GB 3 250MB
- * 10GB 10 0.9GB
- * 100GB 31 3GB
- * 1TB 101 10GB
- * 10TB 320 32GB
- */
-static void __meminit calculate_zone_inactive_ratio(struct zone *zone)
-{
- unsigned int gb, ratio;
-
- /* Zone size in gigabytes */
- gb = zone->present_pages >> (30 - PAGE_SHIFT);
- if (gb)
- ratio = int_sqrt(10 * gb);
- else
- ratio = 1;
-
- zone->inactive_ratio = ratio;
-}
-
-static void __meminit setup_per_zone_inactive_ratio(void)
-{
- struct zone *zone;
-
- for_each_zone(zone)
- calculate_zone_inactive_ratio(zone);
-}
-
-/*
* Initialise min_free_kbytes.
*
* For small machines we want it small (128k min). For large machines
@@ -5131,7 +5088,6 @@ int __meminit init_per_zone_wmark_min(void)
setup_per_zone_wmarks();
refresh_zone_stat_thresholds();
setup_per_zone_lowmem_reserve();
- setup_per_zone_inactive_ratio();
return 0;
}
module_init(init_per_zone_wmark_min)
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 87e4d6a..39aa4d7 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1779,29 +1779,38 @@ static void shrink_active_list(unsigned long nr_to_scan,
}

#ifdef CONFIG_SWAP
-static int inactive_anon_is_low_global(struct zone *zone)
-{
- unsigned long active, inactive;
-
- active = zone_page_state(zone, NR_ACTIVE_ANON);
- inactive = zone_page_state(zone, NR_INACTIVE_ANON);
-
- if (inactive * zone->inactive_ratio < active)
- return 1;
-
- return 0;
-}
-
/**
* inactive_anon_is_low - check if anonymous pages need to be deactivated
* @zone: zone to check
- * @sc: scan control of this context
*
* Returns true if the zone does not have enough inactive anon pages,
* meaning some active anon pages need to be deactivated.
+ *
+ * The inactive anon list should be small enough that the VM never has to
+ * do too much work, but large enough that each inactive page has a chance
+ * to be referenced again before it is swapped out.
+ *
+ * The inactive_anon ratio is the target ratio of ACTIVE_ANON to
+ * INACTIVE_ANON pages on this zone's LRU, maintained by the
+ * pageout code. A zone->inactive_ratio of 3 means 3:1 or 25% of
+ * the anonymous pages are kept on the inactive list.
+ *
+ * total target max
+ * memory ratio inactive anon
+ * -------------------------------------
+ * 10MB 1 5MB
+ * 100MB 1 50MB
+ * 1GB 3 250MB
+ * 10GB 10 0.9GB
+ * 100GB 31 3GB
+ * 1TB 101 10GB
+ * 10TB 320 32GB
*/
static int inactive_anon_is_low(struct mem_cgroup_zone *mz)
{
+ unsigned long active, inactive;
+ unsigned int gb, ratio;
+
/*
* If we don't have swap space, anonymous page deactivation
* is pointless.
@@ -1809,11 +1818,26 @@ static int inactive_anon_is_low(struct mem_cgroup_zone *mz)
if (!total_swap_pages)
return 0;

- if (!scanning_global_lru(mz))
- return mem_cgroup_inactive_anon_is_low(mz->mem_cgroup,
- mz->zone);
+ if (scanning_global_lru(mz)) {
+ active = zone_page_state(mz->zone, NR_ACTIVE_ANON);
+ inactive = zone_page_state(mz->zone, NR_INACTIVE_ANON);
+ } else {
+ active = mem_cgroup_zone_nr_lru_pages(mz->mem_cgroup,
+ zone_to_nid(mz->zone), zone_idx(mz->zone),
+ BIT(LRU_ACTIVE_ANON));
+ inactive = mem_cgroup_zone_nr_lru_pages(mz->mem_cgroup,
+ zone_to_nid(mz->zone), zone_idx(mz->zone),
+ BIT(LRU_INACTIVE_ANON));
+ }
+
+ /* Total size in gigabytes */
+ gb = (active + inactive) >> (30 - PAGE_SHIFT);
+ if (gb)
+ ratio = int_sqrt(10 * gb);
+ else
+ ratio = 1;

- return inactive_anon_is_low_global(mz->zone);
+ return inactive * ratio < active;
}
#else
static inline int inactive_anon_is_low(struct mem_cgroup_zone *mz)
@@ -1822,16 +1846,6 @@ static inline int inactive_anon_is_low(struct mem_cgroup_zone *mz)
}
#endif

-static int inactive_file_is_low_global(struct zone *zone)
-{
- unsigned long active, inactive;
-
- active = zone_page_state(zone, NR_ACTIVE_FILE);
- inactive = zone_page_state(zone, NR_INACTIVE_FILE);
-
- return (active > inactive);
-}
-
/**
* inactive_file_is_low - check if file pages need to be deactivated
* @mz: memory cgroup and zone to check
@@ -1848,11 +1862,21 @@ static int inactive_file_is_low_global(struct zone *zone)
*/
static int inactive_file_is_low(struct mem_cgroup_zone *mz)
{
- if (!scanning_global_lru(mz))
- return mem_cgroup_inactive_file_is_low(mz->mem_cgroup,
- mz->zone);
+ unsigned long active, inactive;
+
+ if (scanning_global_lru(mz)) {
+ active = zone_page_state(mz->zone, NR_ACTIVE_FILE);
+ inactive = zone_page_state(mz->zone, NR_INACTIVE_FILE);
+ } else {
+ active = mem_cgroup_zone_nr_lru_pages(mz->mem_cgroup,
+ zone_to_nid(mz->zone), zone_idx(mz->zone),
+ BIT(LRU_ACTIVE_FILE));
+ inactive = mem_cgroup_zone_nr_lru_pages(mz->mem_cgroup,
+ zone_to_nid(mz->zone), zone_idx(mz->zone),
+ BIT(LRU_INACTIVE_FILE));
+ }

- return inactive_file_is_low_global(mz->zone);
+ return inactive < active;
}

static int inactive_list_is_low(struct mem_cgroup_zone *mz, int file)
diff --git a/mm/vmstat.c b/mm/vmstat.c
index f600557..2c813e1 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -1017,11 +1017,9 @@ static void zoneinfo_show_print(struct seq_file *m, pg_data_t *pgdat,
}
seq_printf(m,
"\n all_unreclaimable: %u"
- "\n start_pfn: %lu"
- "\n inactive_ratio: %u",
+ "\n start_pfn: %lu",
zone->all_unreclaimable,
- zone->zone_start_pfn,
- zone->inactive_ratio);
+ zone->zone_start_pfn);
seq_putc(m, '\n');
}



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