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memcg: add zone_reclaim_stat
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Introduce mem_cgroup_per_zone::reclaim_stat member and its statics
collecting function.

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

[hugh@veritas.com: avoid reclaim_stat oops when disabled]
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: Rik van Riel <riel@redhat.com>
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Cc: Hugh Dickins <hugh@veritas.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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KOSAKI Motohiro authored and Linus Torvalds committed Jan 8, 2009
1 parent a3d8e05 commit 3e2f41f
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Showing 4 changed files with 83 additions and 23 deletions.
16 changes: 16 additions & 0 deletions include/linux/memcontrol.h
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Original file line number Diff line number Diff line change
Expand Up @@ -105,6 +105,10 @@ 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,
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_from_page(struct page *page);

#ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
extern int do_swap_account;
Expand Down Expand Up @@ -271,6 +275,18 @@ mem_cgroup_zone_nr_pages(struct mem_cgroup *memcg, struct zone *zone,
}


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_from_page(struct page *page)
{
return NULL;
}

#endif /* CONFIG_CGROUP_MEM_CONT */

#endif /* _LINUX_MEMCONTROL_H */
Expand Down
29 changes: 29 additions & 0 deletions mm/memcontrol.c
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Original file line number Diff line number Diff line change
Expand Up @@ -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)])
Expand Down Expand Up @@ -458,6 +460,33 @@ unsigned long mem_cgroup_zone_nr_pages(struct mem_cgroup *memcg,
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_from_page(struct page *page)
{
struct page_cgroup *pc;
struct mem_cgroup_per_zone *mz;

if (mem_cgroup_disabled())
return NULL;

pc = lookup_page_cgroup(page);
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,
Expand Down
34 changes: 25 additions & 9 deletions mm/swap.c
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Original file line number Diff line number Diff line change
Expand Up @@ -151,13 +151,32 @@ void rotate_reclaimable_page(struct page *page)
}
}

static void update_page_reclaim_stat(struct zone *zone, struct page *page,
int file, int rotated)
{
struct zone_reclaim_stat *reclaim_stat = &zone->reclaim_stat;
struct zone_reclaim_stat *memcg_reclaim_stat;

memcg_reclaim_stat = mem_cgroup_get_reclaim_stat_from_page(page);

reclaim_stat->recent_scanned[file]++;
if (rotated)
reclaim_stat->recent_rotated[file]++;

if (!memcg_reclaim_stat)
return;

memcg_reclaim_stat->recent_scanned[file]++;
if (rotated)
memcg_reclaim_stat->recent_rotated[file]++;
}

/*
* FIXME: speed this up?
*/
void activate_page(struct page *page)
{
struct zone *zone = page_zone(page);
struct zone_reclaim_stat *reclaim_stat = &zone->reclaim_stat;

spin_lock_irq(&zone->lru_lock);
if (PageLRU(page) && !PageActive(page) && !PageUnevictable(page)) {
Expand All @@ -170,8 +189,7 @@ void activate_page(struct page *page)
add_page_to_lru_list(zone, page, lru);
__count_vm_event(PGACTIVATE);

reclaim_stat->recent_rotated[!!file]++;
reclaim_stat->recent_scanned[!!file]++;
update_page_reclaim_stat(zone, page, !!file, 1);
}
spin_unlock_irq(&zone->lru_lock);
}
Expand Down Expand Up @@ -386,32 +404,30 @@ void ____pagevec_lru_add(struct pagevec *pvec, enum lru_list lru)
{
int i;
struct zone *zone = NULL;
struct zone_reclaim_stat *reclaim_stat = NULL;

VM_BUG_ON(is_unevictable_lru(lru));

for (i = 0; i < pagevec_count(pvec); i++) {
struct page *page = pvec->pages[i];
struct zone *pagezone = page_zone(page);
int file;
int active;

if (pagezone != zone) {
if (zone)
spin_unlock_irq(&zone->lru_lock);
zone = pagezone;
reclaim_stat = &zone->reclaim_stat;
spin_lock_irq(&zone->lru_lock);
}
VM_BUG_ON(PageActive(page));
VM_BUG_ON(PageUnevictable(page));
VM_BUG_ON(PageLRU(page));
SetPageLRU(page);
active = is_active_lru(lru);
file = is_file_lru(lru);
reclaim_stat->recent_scanned[file]++;
if (is_active_lru(lru)) {
if (active)
SetPageActive(page);
reclaim_stat->recent_rotated[file]++;
}
update_page_reclaim_stat(zone, page, file, active);
add_page_to_lru_list(zone, page, lru);
}
if (zone)
Expand Down
27 changes: 13 additions & 14 deletions mm/vmscan.c
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Original file line number Diff line number Diff line change
Expand Up @@ -133,6 +133,9 @@ 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))
return mem_cgroup_get_reclaim_stat(sc->mem_cgroup, zone);

return &zone->reclaim_stat;
}

Expand Down Expand Up @@ -1087,17 +1090,14 @@ static unsigned long shrink_inactive_list(unsigned long max_scan,
__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;
Expand Down Expand Up @@ -1155,7 +1155,7 @@ static unsigned long shrink_inactive_list(unsigned long max_scan,
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]++;
}
Expand Down Expand Up @@ -1230,8 +1230,8 @@ static void shrink_active_list(unsigned long nr_pages, struct zone *zone,
*/
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);
Expand Down Expand Up @@ -1272,8 +1272,7 @@ static void shrink_active_list(unsigned long nr_pages, struct zone *zone,
* 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;

while (!list_empty(&l_inactive)) {
page = lru_to_page(&l_inactive);
Expand Down

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