[PATCH 08/11] memcg: make zone_reclaim_stat

KOSAKI Motohiro
2008-12-01T12:18:06Z

introduce mem_cgroup_per_zone::reclaim_stat member and its statics collecting
function.

Now, get_scan_ratio() can calculate correct value although memcg reclaim.

Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
---
include/linux/memcontrol.h | 16 ++++++++++++++++
mm/memcontrol.c | 23 +++++++++++++++++++++++
mm/swap.c | 14 ++++++++++++++
mm/vmscan.c | 27 +++++++++++++--------------
4 files changed, 66 insertions(+), 14 deletions(-)

Index: b/include/linux/memcontrol.h
===================================================================
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -95,6 +95,10 @@ int mem_cgroup_inactive_anon_is_low(stru
unsigned long mem_cgroup_zone_nr_pages(struct mem_cgroup *memcg,
struct zone *zone,
enum lru_list lru);
+struct zone_reclaim_stat *mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg,
+ struct zone *zone);
+struct zone_reclaim_stat*
+mem_cgroup_get_reclaim_stat_by_page(struct page *page);

#ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
extern int do_swap_account;
@@ -261,6 +265,18 @@ mem_cgroup_zone_nr_pages(struct mem_cgro
}

+static inline struct zone_reclaim_stat*
+mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg, struct zone *zone)
+{
+ return NULL;
+}
+
+static inline struct zone_reclaim_stat*
+mem_cgroup_get_reclaim_stat_by_page(struct page *page)
+{
+ return NULL;
+}
+
#endif /* CONFIG_CGROUP_MEM_CONT */

#endif /* _LINUX_MEMCONTROL_H */
Index: b/mm/memcontrol.c
===================================================================
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -103,6 +103,8 @@ struct mem_cgroup_per_zone {
*/
struct list_head lists[NR_LRU_LISTS];
unsigned long count[NR_LRU_LISTS];
+
+ struct zone_reclaim_stat reclaim_stat;
};
/* Macro for accessing counter */
#define MEM_CGROUP_ZSTAT(mz, idx) ((mz)->count[(idx)])
@@ -458,6 +460,27 @@ unsigned long mem_cgroup_zone_nr_pages(s
return MEM_CGROUP_ZSTAT(mz, lru);
}

+struct zone_reclaim_stat *mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg,
+ struct zone *zone)
+{
+ int nid = zone->zone_pgdat->node_id;
+ int zid = zone_idx(zone);
+ struct mem_cgroup_per_zone *mz = mem_cgroup_zoneinfo(memcg, nid, zid);
+
+ return &mz->reclaim_stat;
+}
+
+struct zone_reclaim_stat *mem_cgroup_get_reclaim_stat_by_page(struct page *page)
+{
+ struct page_cgroup *pc = lookup_page_cgroup(page);
+ struct mem_cgroup_per_zone *mz = page_cgroup_zoneinfo(pc);
+
+ if (!mz)
+ return NULL;
+
+ return &mz->reclaim_stat;
+}
+
unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan,
struct list_head *dst,
unsigned long *scanned, int order,
Index: b/mm/swap.c
===================================================================
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -158,6 +158,7 @@ void activate_page(struct page *page)
{
struct zone *zone = page_zone(page);
struct zone_reclaim_stat *reclaim_stat = &zone->reclaim_stat;
+ struct zone_reclaim_stat *memcg_reclaim_stat;

spin_lock_irq(&zone->lru_lock);
if (PageLRU(page) && !PageActive(page) && !PageUnevictable(page)) {
@@ -172,6 +173,12 @@ void activate_page(struct page *page)

reclaim_stat->recent_rotated[!!file]++;
reclaim_stat->recent_scanned[!!file]++;
+
+ memcg_reclaim_stat = mem_cgroup_get_reclaim_stat_by_page(page);
+ if (memcg_reclaim_stat) {
+ memcg_reclaim_stat->recent_rotated[!!file]++;
+ memcg_reclaim_stat->recent_scanned[!!file]++;
+ }
}
spin_unlock_irq(&zone->lru_lock);
}
@@ -400,6 +407,7 @@ void ____pagevec_lru_add(struct pagevec
int i;
struct zone *zone = NULL;
struct zone_reclaim_stat *reclaim_stat = NULL;
+ struct zone_reclaim_stat *memcg_reclaim_stat = NULL;

VM_BUG_ON(is_unevictable_lru(lru));

@@ -413,6 +421,8 @@ void ____pagevec_lru_add(struct pagevec
spin_unlock_irq(&zone->lru_lock);
zone = pagezone;
reclaim_stat = &zone->reclaim_stat;
+ memcg_reclaim_stat =
+ mem_cgroup_get_reclaim_stat_by_page(page);
spin_lock_irq(&zone->lru_lock);
}
VM_BUG_ON(PageActive(page));
@@ -421,9 +431,13 @@ void ____pagevec_lru_add(struct pagevec
SetPageLRU(page);
file = is_file_lru(lru);
reclaim_stat->recent_scanned[file]++;
+ if (memcg_reclaim_stat)
+ memcg_reclaim_stat->recent_scanned[file]++;
if (is_active_lru(lru)) {
SetPageActive(page);
reclaim_stat->recent_rotated[file]++;
+ if (memcg_reclaim_stat)
+ memcg_reclaim_stat->recent_rotated[file]++;
}
add_page_to_lru_list(zone, page, lru);
}
Index: b/mm/vmscan.c
===================================================================
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -134,6 +134,9 @@ static DECLARE_RWSEM(shrinker_rwsem);
static struct zone_reclaim_stat *get_reclaim_stat(struct zone *zone,
struct scan_control *sc)
{
+ if (!scan_global_lru(sc))
+ mem_cgroup_get_reclaim_stat(sc->mem_cgroup, zone);
+
return &zone->reclaim_stat;
}

@@ -1141,17 +1144,14 @@ static unsigned long shrink_inactive_lis
__mod_zone_page_state(zone, NR_INACTIVE_ANON,
-count[LRU_INACTIVE_ANON]);

- if (scan_global_lru(sc)) {
+ if (scan_global_lru(sc))
zone->pages_scanned += nr_scan;
- reclaim_stat->recent_scanned[0] +=
- count[LRU_INACTIVE_ANON];
- reclaim_stat->recent_scanned[0] +=
- count[LRU_ACTIVE_ANON];
- reclaim_stat->recent_scanned[1] +=
- count[LRU_INACTIVE_FILE];
- reclaim_stat->recent_scanned[1] +=
- count[LRU_ACTIVE_FILE];
- }
+
+ reclaim_stat->recent_scanned[0] += count[LRU_INACTIVE_ANON];
+ reclaim_stat->recent_scanned[0] += count[LRU_ACTIVE_ANON];
+ reclaim_stat->recent_scanned[1] += count[LRU_INACTIVE_FILE];
+ reclaim_stat->recent_scanned[1] += count[LRU_ACTIVE_FILE];
+
spin_unlock_irq(&zone->lru_lock);

nr_scanned += nr_scan;
@@ -1209,7 +1209,7 @@ static unsigned long shrink_inactive_lis
SetPageLRU(page);
lru = page_lru(page);
add_page_to_lru_list(zone, page, lru);
- if (PageActive(page) && scan_global_lru(sc)) {
+ if (PageActive(page)) {
int file = !!page_is_file_cache(page);
reclaim_stat->recent_rotated[file]++;
}
@@ -1289,8 +1289,8 @@ static void shrink_active_list(unsigned
*/
if (scan_global_lru(sc)) {
zone->pages_scanned += pgscanned;
- reclaim_stat->recent_scanned[!!file] += pgmoved;
}
+ reclaim_stat->recent_scanned[!!file] += pgmoved;

if (file)
__mod_zone_page_state(zone, NR_ACTIVE_FILE, -pgmoved);
@@ -1323,8 +1323,7 @@ static void shrink_active_list(unsigned
* This helps balance scan pressure between file and anonymous
* pages in get_scan_ratio.
*/
- if (scan_global_lru(sc))
- reclaim_stat->recent_rotated[!!file] += pgmoved;
+ reclaim_stat->recent_rotated[!!file] += pgmoved;

/*
* Move the pages to the [file or anon] inactive list.