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Subject[PATCH 3/10] mm/memcg: add zone pointer into lruvec
The lruvec is looking rather useful: if we just add a zone pointer
into the lruvec, then we can pass the lruvec pointer around and save
some superfluous arguments and recomputations in various places.

Just occasionally we do want mem_cgroup_from_lruvec() to get back from
lruvec to memcg; but then we can remove all uses of vmscan.c's private
mem_cgroup_zone *mz, passing the lruvec pointer instead.

And while we're there, get_scan_count() can call vmscan_swappiness()
once, instead of twice in a row.

Signed-off-by: Hugh Dickins <hughd@google.com>
---
include/linux/memcontrol.h | 23 ++-
include/linux/mmzone.h | 1
mm/memcontrol.c | 47 ++++----
mm/page_alloc.c | 1
mm/vmscan.c | 203 +++++++++++++++--------------------
5 files changed, 128 insertions(+), 147 deletions(-)
--- mmotm.orig/include/linux/memcontrol.h 2012-02-18 11:57:20.391524062 -0800
+++ mmotm/include/linux/memcontrol.h 2012-02-18 11:57:28.371524252 -0800
@@ -63,6 +63,7 @@ extern int mem_cgroup_cache_charge(struc
gfp_t gfp_mask);

struct lruvec *mem_cgroup_zone_lruvec(struct zone *, struct mem_cgroup *);
+extern struct mem_cgroup *mem_cgroup_from_lruvec(struct lruvec *lruvec);
struct lruvec *mem_cgroup_lru_add_list(struct zone *, struct page *,
enum lru_list);
void mem_cgroup_lru_del_list(struct page *, enum lru_list);
@@ -113,13 +114,11 @@ void mem_cgroup_iter_break(struct mem_cg
/*
* 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_inactive_anon_is_low(struct lruvec *lruvec);
+int mem_cgroup_inactive_file_is_low(struct lruvec *lruvec);
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);
+unsigned long mem_cgroup_zone_nr_lru_pages(struct lruvec *lruvec,
+ unsigned int lrumask);
struct zone_reclaim_stat*
mem_cgroup_get_reclaim_stat_from_page(struct page *page);
extern void mem_cgroup_print_oom_info(struct mem_cgroup *memcg,
@@ -249,6 +248,11 @@ static inline struct lruvec *mem_cgroup_
return &zone->lruvec;
}

+static inline struct mem_cgroup *mem_cgroup_from_lruvec(struct lruvec *lruvec)
+{
+ return NULL;
+}
+
static inline struct lruvec *mem_cgroup_lru_add_list(struct zone *zone,
struct page *page,
enum lru_list lru)
@@ -331,20 +335,19 @@ static inline bool mem_cgroup_disabled(v
}

static inline int
-mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg, struct zone *zone)
+mem_cgroup_inactive_anon_is_low(struct lruvec *lruvec)
{
return 1;
}

static inline int
-mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg, struct zone *zone)
+mem_cgroup_inactive_file_is_low(struct lruvec *lruvec)
{
return 1;
}

static inline unsigned long
-mem_cgroup_zone_nr_lru_pages(struct mem_cgroup *memcg, int nid, int zid,
- unsigned int lru_mask)
+mem_cgroup_zone_nr_lru_pages(struct lruvec *lruvec, unsigned int lru_mask)
{
return 0;
}
--- mmotm.orig/include/linux/mmzone.h 2012-02-18 11:57:20.391524062 -0800
+++ mmotm/include/linux/mmzone.h 2012-02-18 11:57:28.371524252 -0800
@@ -173,6 +173,7 @@ struct zone_reclaim_stat {
};

struct lruvec {
+ struct zone *zone;
struct list_head lists[NR_LRU_LISTS];
struct zone_reclaim_stat reclaim_stat;
};
--- mmotm.orig/mm/memcontrol.c 2012-02-18 11:57:20.391524062 -0800
+++ mmotm/mm/memcontrol.c 2012-02-18 11:57:28.371524252 -0800
@@ -703,14 +703,13 @@ static void mem_cgroup_charge_statistics
}

unsigned long
-mem_cgroup_zone_nr_lru_pages(struct mem_cgroup *memcg, int nid, int zid,
- unsigned int lru_mask)
+mem_cgroup_zone_nr_lru_pages(struct lruvec *lruvec, unsigned int lru_mask)
{
struct mem_cgroup_per_zone *mz;
enum lru_list lru;
unsigned long ret = 0;

- mz = mem_cgroup_zoneinfo(memcg, nid, zid);
+ mz = container_of(lruvec, struct mem_cgroup_per_zone, lruvec);

for_each_lru(lru) {
if (BIT(lru) & lru_mask)
@@ -723,12 +722,14 @@ static unsigned long
mem_cgroup_node_nr_lru_pages(struct mem_cgroup *memcg,
int nid, unsigned int lru_mask)
{
+ struct mem_cgroup_per_zone *mz;
u64 total = 0;
int zid;

- for (zid = 0; zid < MAX_NR_ZONES; zid++)
- total += mem_cgroup_zone_nr_lru_pages(memcg,
- nid, zid, lru_mask);
+ for (zid = 0; zid < MAX_NR_ZONES; zid++) {
+ mz = mem_cgroup_zoneinfo(memcg, nid, zid);
+ total += mem_cgroup_zone_nr_lru_pages(&mz->lruvec, lru_mask);
+ }

return total;
}
@@ -1003,13 +1004,24 @@ struct lruvec *mem_cgroup_zone_lruvec(st
{
struct mem_cgroup_per_zone *mz;

- if (mem_cgroup_disabled())
+ if (!memcg || mem_cgroup_disabled())
return &zone->lruvec;

mz = mem_cgroup_zoneinfo(memcg, zone_to_nid(zone), zone_idx(zone));
return &mz->lruvec;
}

+struct mem_cgroup *mem_cgroup_from_lruvec(struct lruvec *lruvec)
+{
+ struct mem_cgroup_per_zone *mz;
+
+ if (mem_cgroup_disabled())
+ return NULL;
+
+ mz = container_of(lruvec, struct mem_cgroup_per_zone, lruvec);
+ return mz->memcg;
+}
+
/*
* Following LRU functions are allowed to be used without PCG_LOCK.
* Operations are called by routine of global LRU independently from memcg.
@@ -1161,19 +1173,15 @@ int task_in_mem_cgroup(struct task_struc
return ret;
}

-int mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg, struct zone *zone)
+int mem_cgroup_inactive_anon_is_low(struct lruvec *lruvec)
{
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));
+ inactive = mem_cgroup_zone_nr_lru_pages(lruvec, BIT(LRU_INACTIVE_ANON));
+ active = mem_cgroup_zone_nr_lru_pages(lruvec, BIT(LRU_ACTIVE_ANON));

gb = (inactive + active) >> (30 - PAGE_SHIFT);
if (gb)
@@ -1184,17 +1192,13 @@ int mem_cgroup_inactive_anon_is_low(stru
return inactive * inactive_ratio < active;
}

-int mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg, struct zone *zone)
+int mem_cgroup_inactive_file_is_low(struct lruvec *lruvec)
{
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));
+ inactive = mem_cgroup_zone_nr_lru_pages(lruvec, BIT(LRU_INACTIVE_FILE));
+ active = mem_cgroup_zone_nr_lru_pages(lruvec, BIT(LRU_ACTIVE_FILE));

return (active > inactive);
}
@@ -4755,6 +4759,7 @@ static int alloc_mem_cgroup_per_zone_inf

for (zone = 0; zone < MAX_NR_ZONES; zone++) {
mz = &pn->zoneinfo[zone];
+ mz->lruvec.zone = &NODE_DATA(node)->node_zones[zone];
for_each_lru(lru)
INIT_LIST_HEAD(&mz->lruvec.lists[lru]);
mz->usage_in_excess = 0;
--- mmotm.orig/mm/page_alloc.c 2012-02-18 11:57:20.395524062 -0800
+++ mmotm/mm/page_alloc.c 2012-02-18 11:57:28.375524252 -0800
@@ -4365,6 +4365,7 @@ static void __paginginit free_area_init_
zone->zone_pgdat = pgdat;

zone_pcp_init(zone);
+ zone->lruvec.zone = zone;
for_each_lru(lru)
INIT_LIST_HEAD(&zone->lruvec.lists[lru]);
zone->lruvec.reclaim_stat.recent_rotated[0] = 0;
--- mmotm.orig/mm/vmscan.c 2012-02-18 11:57:20.395524062 -0800
+++ mmotm/mm/vmscan.c 2012-02-18 11:57:28.375524252 -0800
@@ -115,11 +115,6 @@ struct scan_control {
nodemask_t *nodemask;
};

-struct mem_cgroup_zone {
- struct mem_cgroup *mem_cgroup;
- struct zone *zone;
-};
-
#define lru_to_page(_head) (list_entry((_head)->prev, struct page, lru))

#ifdef ARCH_HAS_PREFETCH
@@ -171,21 +166,12 @@ static bool global_reclaim(struct scan_c
}
#endif

-static struct zone_reclaim_stat *get_reclaim_stat(struct mem_cgroup_zone *mz)
-{
- return &mem_cgroup_zone_lruvec(mz->zone, mz->mem_cgroup)->reclaim_stat;
-}
-
-static unsigned long zone_nr_lru_pages(struct mem_cgroup_zone *mz,
- enum lru_list lru)
+static unsigned long zone_nr_lru_pages(struct lruvec *lruvec, enum lru_list lru)
{
if (!mem_cgroup_disabled())
- return mem_cgroup_zone_nr_lru_pages(mz->mem_cgroup,
- zone_to_nid(mz->zone),
- zone_idx(mz->zone),
- BIT(lru));
+ return mem_cgroup_zone_nr_lru_pages(lruvec, BIT(lru));

- return zone_page_state(mz->zone, NR_LRU_BASE + lru);
+ return zone_page_state(lruvec->zone, NR_LRU_BASE + lru);
}


@@ -688,13 +674,13 @@ enum page_references {
};

static enum page_references page_check_references(struct page *page,
- struct mem_cgroup_zone *mz,
+ struct mem_cgroup *memcg,
struct scan_control *sc)
{
int referenced_ptes, referenced_page;
unsigned long vm_flags;

- referenced_ptes = page_referenced(page, 1, mz->mem_cgroup, &vm_flags);
+ referenced_ptes = page_referenced(page, 1, memcg, &vm_flags);
referenced_page = TestClearPageReferenced(page);

/* Lumpy reclaim - ignore references */
@@ -750,12 +736,13 @@ static enum page_references page_check_r
* shrink_page_list() returns the number of reclaimed pages
*/
static unsigned long shrink_page_list(struct list_head *page_list,
- struct mem_cgroup_zone *mz,
+ struct lruvec *lruvec,
struct scan_control *sc,
int priority,
unsigned long *ret_nr_dirty,
unsigned long *ret_nr_writeback)
{
+ struct mem_cgroup *memcg = mem_cgroup_from_lruvec(lruvec);
LIST_HEAD(ret_pages);
LIST_HEAD(free_pages);
int pgactivate = 0;
@@ -781,7 +768,7 @@ static unsigned long shrink_page_list(st
goto keep;

VM_BUG_ON(PageActive(page));
- VM_BUG_ON(page_zone(page) != mz->zone);
+ VM_BUG_ON(page_zone(page) != lruvec->zone);

sc->nr_scanned++;

@@ -815,7 +802,7 @@ static unsigned long shrink_page_list(st
}
}

- references = page_check_references(page, mz, sc);
+ references = page_check_references(page, memcg, sc);
switch (references) {
case PAGEREF_ACTIVATE:
goto activate_locked;
@@ -1007,7 +994,7 @@ keep_lumpy:
* will encounter the same problem
*/
if (nr_dirty && nr_dirty == nr_congested && global_reclaim(sc))
- zone_set_flag(mz->zone, ZONE_CONGESTED);
+ zone_set_flag(lruvec->zone, ZONE_CONGESTED);

free_hot_cold_page_list(&free_pages, 1);

@@ -1122,7 +1109,7 @@ int __isolate_lru_page(struct page *page
* Appropriate locks must be held before calling this function.
*
* @nr_to_scan: The number of pages to look through on the list.
- * @mz: The mem_cgroup_zone to pull pages from.
+ * @lruvec: The mem_cgroup/zone lruvec to pull pages from.
* @dst: The temp list to put pages on to.
* @nr_scanned: The number of pages that were scanned.
* @sc: The scan_control struct for this reclaim session
@@ -1133,11 +1120,10 @@ int __isolate_lru_page(struct page *page
* returns how many pages were moved onto *@dst.
*/
static unsigned long isolate_lru_pages(unsigned long nr_to_scan,
- struct mem_cgroup_zone *mz, struct list_head *dst,
+ struct lruvec *lruvec, struct list_head *dst,
unsigned long *nr_scanned, struct scan_control *sc,
isolate_mode_t mode, int active, int file)
{
- struct lruvec *lruvec;
struct list_head *src;
unsigned long nr_taken = 0;
unsigned long nr_lumpy_taken = 0;
@@ -1146,7 +1132,6 @@ static unsigned long isolate_lru_pages(u
unsigned long scan;
int lru = LRU_BASE;

- lruvec = mem_cgroup_zone_lruvec(mz->zone, mz->mem_cgroup);
if (active)
lru += LRU_ACTIVE;
if (file)
@@ -1344,11 +1329,10 @@ static int too_many_isolated(struct zone
}

static noinline_for_stack void
-putback_inactive_pages(struct mem_cgroup_zone *mz,
- struct list_head *page_list)
+putback_inactive_pages(struct lruvec *lruvec, struct list_head *page_list)
{
- struct zone_reclaim_stat *reclaim_stat = get_reclaim_stat(mz);
- struct zone *zone = mz->zone;
+ struct zone_reclaim_stat *reclaim_stat = &lruvec->reclaim_stat;
+ struct zone *zone = lruvec->zone;
LIST_HEAD(pages_to_free);

/*
@@ -1395,12 +1379,9 @@ putback_inactive_pages(struct mem_cgroup
}

static noinline_for_stack void
-update_isolated_counts(struct mem_cgroup_zone *mz,
- struct list_head *page_list,
- unsigned long *nr_anon,
- unsigned long *nr_file)
+update_isolated_counts(struct zone *zone, struct list_head *page_list,
+ unsigned long *nr_anon, unsigned long *nr_file)
{
- struct zone *zone = mz->zone;
unsigned int count[NR_LRU_LISTS] = { 0, };
unsigned long nr_active = 0;
struct page *page;
@@ -1486,9 +1467,11 @@ static inline bool should_reclaim_stall(
* of reclaimed pages
*/
static noinline_for_stack unsigned long
-shrink_inactive_list(unsigned long nr_to_scan, struct mem_cgroup_zone *mz,
+shrink_inactive_list(unsigned long nr_to_scan, struct lruvec *lruvec,
struct scan_control *sc, int priority, int file)
{
+ struct zone_reclaim_stat *reclaim_stat = &lruvec->reclaim_stat;
+ struct zone *zone = lruvec->zone;
LIST_HEAD(page_list);
unsigned long nr_scanned;
unsigned long nr_reclaimed = 0;
@@ -1498,8 +1481,6 @@ shrink_inactive_list(unsigned long nr_to
unsigned long nr_dirty = 0;
unsigned long nr_writeback = 0;
isolate_mode_t isolate_mode = ISOLATE_INACTIVE;
- struct zone *zone = mz->zone;
- struct zone_reclaim_stat *reclaim_stat = get_reclaim_stat(mz);

while (unlikely(too_many_isolated(zone, file, sc))) {
congestion_wait(BLK_RW_ASYNC, HZ/10);
@@ -1522,31 +1503,29 @@ shrink_inactive_list(unsigned long nr_to

spin_lock_irq(&zone->lru_lock);

- nr_taken = isolate_lru_pages(nr_to_scan, mz, &page_list, &nr_scanned,
- sc, isolate_mode, 0, file);
+ nr_taken = isolate_lru_pages(nr_to_scan, lruvec, &page_list,
+ &nr_scanned, sc, isolate_mode, 0, file);
if (global_reclaim(sc)) {
zone->pages_scanned += nr_scanned;
if (current_is_kswapd())
- __count_zone_vm_events(PGSCAN_KSWAPD, zone,
- nr_scanned);
+ __count_zone_vm_events(PGSCAN_KSWAPD, zone, nr_scanned);
else
- __count_zone_vm_events(PGSCAN_DIRECT, zone,
- nr_scanned);
+ __count_zone_vm_events(PGSCAN_DIRECT, zone, nr_scanned);
}
spin_unlock_irq(&zone->lru_lock);

if (nr_taken == 0)
return 0;

- update_isolated_counts(mz, &page_list, &nr_anon, &nr_file);
+ update_isolated_counts(zone, &page_list, &nr_anon, &nr_file);

- nr_reclaimed = shrink_page_list(&page_list, mz, sc, priority,
+ nr_reclaimed = shrink_page_list(&page_list, lruvec, sc, priority,
&nr_dirty, &nr_writeback);

/* Check if we should syncronously wait for writeback */
if (should_reclaim_stall(nr_taken, nr_reclaimed, priority, sc)) {
set_reclaim_mode(priority, sc, true);
- nr_reclaimed += shrink_page_list(&page_list, mz, sc,
+ nr_reclaimed += shrink_page_list(&page_list, lruvec, sc,
priority, &nr_dirty, &nr_writeback);
}

@@ -1559,7 +1538,7 @@ shrink_inactive_list(unsigned long nr_to
__count_vm_events(KSWAPD_STEAL, nr_reclaimed);
__count_zone_vm_events(PGSTEAL, zone, nr_reclaimed);

- putback_inactive_pages(mz, &page_list);
+ putback_inactive_pages(lruvec, &page_list);

__mod_zone_page_state(zone, NR_ISOLATED_ANON, -nr_anon);
__mod_zone_page_state(zone, NR_ISOLATED_FILE, -nr_file);
@@ -1659,10 +1638,13 @@ static void move_active_pages_to_lru(str
}

static void shrink_active_list(unsigned long nr_to_scan,
- struct mem_cgroup_zone *mz,
+ struct lruvec *lruvec,
struct scan_control *sc,
int priority, int file)
{
+ struct mem_cgroup *memcg = mem_cgroup_from_lruvec(lruvec);
+ struct zone_reclaim_stat *reclaim_stat = &lruvec->reclaim_stat;
+ struct zone *zone = lruvec->zone;
unsigned long nr_taken;
unsigned long nr_scanned;
unsigned long vm_flags;
@@ -1670,10 +1652,8 @@ static void shrink_active_list(unsigned
LIST_HEAD(l_active);
LIST_HEAD(l_inactive);
struct page *page;
- struct zone_reclaim_stat *reclaim_stat = get_reclaim_stat(mz);
unsigned long nr_rotated = 0;
isolate_mode_t isolate_mode = ISOLATE_ACTIVE;
- struct zone *zone = mz->zone;

lru_add_drain();

@@ -1684,8 +1664,8 @@ static void shrink_active_list(unsigned

spin_lock_irq(&zone->lru_lock);

- nr_taken = isolate_lru_pages(nr_to_scan, mz, &l_hold, &nr_scanned, sc,
- isolate_mode, 1, file);
+ nr_taken = isolate_lru_pages(nr_to_scan, lruvec, &l_hold,
+ &nr_scanned, sc, isolate_mode, 1, file);
if (global_reclaim(sc))
zone->pages_scanned += nr_scanned;

@@ -1717,7 +1697,7 @@ static void shrink_active_list(unsigned
}
}

- if (page_referenced(page, 0, mz->mem_cgroup, &vm_flags)) {
+ if (page_referenced(page, 0, memcg, &vm_flags)) {
nr_rotated += hpage_nr_pages(page);
/*
* Identify referenced, file-backed active pages and
@@ -1776,13 +1756,12 @@ static int inactive_anon_is_low_global(s

/**
* inactive_anon_is_low - check if anonymous pages need to be deactivated
- * @zone: zone to check
- * @sc: scan control of this context
+ * @lruvec: The mem_cgroup/zone lruvec to check
*
* Returns true if the zone does not have enough inactive anon pages,
* meaning some active anon pages need to be deactivated.
*/
-static int inactive_anon_is_low(struct mem_cgroup_zone *mz)
+static int inactive_anon_is_low(struct lruvec *lruvec)
{
/*
* If we don't have swap space, anonymous page deactivation
@@ -1792,13 +1771,12 @@ static int inactive_anon_is_low(struct m
return 0;

if (!mem_cgroup_disabled())
- return mem_cgroup_inactive_anon_is_low(mz->mem_cgroup,
- mz->zone);
+ return mem_cgroup_inactive_anon_is_low(lruvec);

- return inactive_anon_is_low_global(mz->zone);
+ return inactive_anon_is_low_global(lruvec->zone);
}
#else
-static inline int inactive_anon_is_low(struct mem_cgroup_zone *mz)
+static inline int inactive_anon_is_low(struct lruvec *lruvec)
{
return 0;
}
@@ -1816,7 +1794,7 @@ static int inactive_file_is_low_global(s

/**
* inactive_file_is_low - check if file pages need to be deactivated
- * @mz: memory cgroup and zone to check
+ * @lruvec: The mem_cgroup/zone lruvec to check
*
* When the system is doing streaming IO, memory pressure here
* ensures that active file pages get deactivated, until more
@@ -1828,44 +1806,44 @@ static int inactive_file_is_low_global(s
* This uses a different ratio than the anonymous pages, because
* the page cache uses a use-once replacement algorithm.
*/
-static int inactive_file_is_low(struct mem_cgroup_zone *mz)
+static int inactive_file_is_low(struct lruvec *lruvec)
{
if (!mem_cgroup_disabled())
- return mem_cgroup_inactive_file_is_low(mz->mem_cgroup,
- mz->zone);
+ return mem_cgroup_inactive_file_is_low(lruvec);

- return inactive_file_is_low_global(mz->zone);
+ return inactive_file_is_low_global(lruvec->zone);
}

-static int inactive_list_is_low(struct mem_cgroup_zone *mz, int file)
+static int inactive_list_is_low(struct lruvec *lruvec, int file)
{
if (file)
- return inactive_file_is_low(mz);
+ return inactive_file_is_low(lruvec);
else
- return inactive_anon_is_low(mz);
+ return inactive_anon_is_low(lruvec);
}

static unsigned long shrink_list(enum lru_list lru, unsigned long nr_to_scan,
- struct mem_cgroup_zone *mz,
+ struct lruvec *lruvec,
struct scan_control *sc, int priority)
{
int file = is_file_lru(lru);

if (is_active_lru(lru)) {
- if (inactive_list_is_low(mz, file))
- shrink_active_list(nr_to_scan, mz, sc, priority, file);
+ if (inactive_list_is_low(lruvec, file))
+ shrink_active_list(nr_to_scan, lruvec, sc, priority,
+ file);
return 0;
}

- return shrink_inactive_list(nr_to_scan, mz, sc, priority, file);
+ return shrink_inactive_list(nr_to_scan, lruvec, sc, priority, file);
}

-static int vmscan_swappiness(struct mem_cgroup_zone *mz,
+static int vmscan_swappiness(struct lruvec *lruvec,
struct scan_control *sc)
{
if (global_reclaim(sc))
return vm_swappiness;
- return mem_cgroup_swappiness(mz->mem_cgroup);
+ return mem_cgroup_swappiness(mem_cgroup_from_lruvec(lruvec));
}

/*
@@ -1876,13 +1854,14 @@ static int vmscan_swappiness(struct mem_
*
* nr[0] = anon pages to scan; nr[1] = file pages to scan
*/
-static void get_scan_count(struct mem_cgroup_zone *mz, struct scan_control *sc,
+static void get_scan_count(struct lruvec *lruvec, struct scan_control *sc,
unsigned long *nr, int priority)
{
+ struct zone_reclaim_stat *reclaim_stat = &lruvec->reclaim_stat;
+ struct zone *zone = lruvec->zone;
unsigned long anon, file, free;
unsigned long anon_prio, file_prio;
unsigned long ap, fp;
- struct zone_reclaim_stat *reclaim_stat = get_reclaim_stat(mz);
u64 fraction[2], denominator;
enum lru_list lru;
int noswap = 0;
@@ -1898,7 +1877,7 @@ static void get_scan_count(struct mem_cg
* latencies, so it's better to scan a minimum amount there as
* well.
*/
- if (current_is_kswapd() && mz->zone->all_unreclaimable)
+ if (current_is_kswapd() && zone->all_unreclaimable)
force_scan = true;
if (!global_reclaim(sc))
force_scan = true;
@@ -1912,16 +1891,16 @@ static void get_scan_count(struct mem_cg
goto out;
}

- anon = zone_nr_lru_pages(mz, LRU_ACTIVE_ANON) +
- zone_nr_lru_pages(mz, LRU_INACTIVE_ANON);
- file = zone_nr_lru_pages(mz, LRU_ACTIVE_FILE) +
- zone_nr_lru_pages(mz, LRU_INACTIVE_FILE);
+ anon = zone_nr_lru_pages(lruvec, LRU_ACTIVE_ANON) +
+ zone_nr_lru_pages(lruvec, LRU_INACTIVE_ANON);
+ file = zone_nr_lru_pages(lruvec, LRU_ACTIVE_FILE) +
+ zone_nr_lru_pages(lruvec, LRU_INACTIVE_FILE);

if (global_reclaim(sc)) {
- free = zone_page_state(mz->zone, NR_FREE_PAGES);
+ free = zone_page_state(zone, NR_FREE_PAGES);
/* If we have very few page cache pages,
force-scan anon pages. */
- if (unlikely(file + free <= high_wmark_pages(mz->zone))) {
+ if (unlikely(file + free <= high_wmark_pages(zone))) {
fraction[0] = 1;
fraction[1] = 0;
denominator = 1;
@@ -1933,8 +1912,8 @@ static void get_scan_count(struct mem_cg
* With swappiness at 100, anonymous and file have the same priority.
* This scanning priority is essentially the inverse of IO cost.
*/
- anon_prio = vmscan_swappiness(mz, sc);
- file_prio = 200 - vmscan_swappiness(mz, sc);
+ anon_prio = vmscan_swappiness(lruvec, sc);
+ file_prio = 200 - anon_prio;

/*
* OK, so we have swap space and a fair amount of page cache
@@ -1947,7 +1926,7 @@ static void get_scan_count(struct mem_cg
*
* anon in [0], file in [1]
*/
- spin_lock_irq(&mz->zone->lru_lock);
+ spin_lock_irq(&zone->lru_lock);
if (unlikely(reclaim_stat->recent_scanned[0] > anon / 4)) {
reclaim_stat->recent_scanned[0] /= 2;
reclaim_stat->recent_rotated[0] /= 2;
@@ -1968,7 +1947,7 @@ static void get_scan_count(struct mem_cg

fp = (file_prio + 1) * (reclaim_stat->recent_scanned[1] + 1);
fp /= reclaim_stat->recent_rotated[1] + 1;
- spin_unlock_irq(&mz->zone->lru_lock);
+ spin_unlock_irq(&zone->lru_lock);

fraction[0] = ap;
fraction[1] = fp;
@@ -1978,7 +1957,7 @@ out:
int file = is_file_lru(lru);
unsigned long scan;

- scan = zone_nr_lru_pages(mz, lru);
+ scan = zone_nr_lru_pages(lruvec, lru);
if (priority || noswap) {
scan >>= priority;
if (!scan && force_scan)
@@ -1996,7 +1975,7 @@ out:
* back to the allocator and call try_to_compact_zone(), we ensure that
* there are enough free pages for it to be likely successful
*/
-static inline bool should_continue_reclaim(struct mem_cgroup_zone *mz,
+static inline bool should_continue_reclaim(struct lruvec *lruvec,
unsigned long nr_reclaimed,
unsigned long nr_scanned,
struct scan_control *sc)
@@ -2036,15 +2015,16 @@ static inline bool should_continue_recla
* inactive lists are large enough, continue reclaiming
*/
pages_for_compaction = (2UL << sc->order);
- inactive_lru_pages = zone_nr_lru_pages(mz, LRU_INACTIVE_FILE);
+ inactive_lru_pages = zone_nr_lru_pages(lruvec, LRU_INACTIVE_FILE);
if (nr_swap_pages > 0)
- inactive_lru_pages += zone_nr_lru_pages(mz, LRU_INACTIVE_ANON);
+ inactive_lru_pages += zone_nr_lru_pages(lruvec,
+ LRU_INACTIVE_ANON);
if (sc->nr_reclaimed < pages_for_compaction &&
inactive_lru_pages > pages_for_compaction)
return true;

/* If compaction would go ahead or the allocation would succeed, stop */
- switch (compaction_suitable(mz->zone, sc->order)) {
+ switch (compaction_suitable(lruvec->zone, sc->order)) {
case COMPACT_PARTIAL:
case COMPACT_CONTINUE:
return false;
@@ -2056,7 +2036,7 @@ static inline bool should_continue_recla
/*
* This is a basic per-zone page freer. Used by both kswapd and direct reclaim.
*/
-static void shrink_mem_cgroup_zone(int priority, struct mem_cgroup_zone *mz,
+static void shrink_mem_cgroup_zone(int priority, struct lruvec *lruvec,
struct scan_control *sc)
{
unsigned long nr[NR_LRU_LISTS];
@@ -2069,7 +2049,7 @@ static void shrink_mem_cgroup_zone(int p
restart:
nr_reclaimed = 0;
nr_scanned = sc->nr_scanned;
- get_scan_count(mz, sc, nr, priority);
+ get_scan_count(lruvec, sc, nr, priority);

blk_start_plug(&plug);
while (nr[LRU_INACTIVE_ANON] || nr[LRU_ACTIVE_FILE] ||
@@ -2081,7 +2061,7 @@ restart:
nr[lru] -= nr_to_scan;

nr_reclaimed += shrink_list(lru, nr_to_scan,
- mz, sc, priority);
+ lruvec, sc, priority);
}
}
/*
@@ -2107,11 +2087,11 @@ restart:
* Even if we did not try to evict anon pages at all, we want to
* rebalance the anon lru active/inactive ratio.
*/
- if (inactive_anon_is_low(mz))
- shrink_active_list(SWAP_CLUSTER_MAX, mz, sc, priority, 0);
+ if (inactive_anon_is_low(lruvec))
+ shrink_active_list(SWAP_CLUSTER_MAX, lruvec, sc, priority, 0);

/* reclaim/compaction might need reclaim to continue */
- if (should_continue_reclaim(mz, nr_reclaimed,
+ if (should_continue_reclaim(lruvec, nr_reclaimed,
sc->nr_scanned - nr_scanned, sc))
goto restart;

@@ -2130,12 +2110,9 @@ static void shrink_zone(int priority, st

memcg = mem_cgroup_iter(root, NULL, &reclaim);
do {
- struct mem_cgroup_zone mz = {
- .mem_cgroup = memcg,
- .zone = zone,
- };
+ struct lruvec *lruvec = mem_cgroup_zone_lruvec(zone, memcg);

- shrink_mem_cgroup_zone(priority, &mz, sc);
+ shrink_mem_cgroup_zone(priority, lruvec, sc);
/*
* Limit reclaim has historically picked one memcg and
* scanned it with decreasing priority levels until
@@ -2463,10 +2440,7 @@ unsigned long mem_cgroup_shrink_node_zon
.order = 0,
.target_mem_cgroup = memcg,
};
- struct mem_cgroup_zone mz = {
- .mem_cgroup = memcg,
- .zone = zone,
- };
+ struct lruvec *lruvec = mem_cgroup_zone_lruvec(zone, memcg);

sc.gfp_mask = (gfp_mask & GFP_RECLAIM_MASK) |
(GFP_HIGHUSER_MOVABLE & ~GFP_RECLAIM_MASK);
@@ -2482,7 +2456,7 @@ unsigned long mem_cgroup_shrink_node_zon
* will pick up pages from other mem cgroup's as well. We hack
* the priority and make it zero.
*/
- shrink_mem_cgroup_zone(0, &mz, &sc);
+ shrink_mem_cgroup_zone(0, lruvec, &sc);

trace_mm_vmscan_memcg_softlimit_reclaim_end(sc.nr_reclaimed);

@@ -2543,13 +2517,10 @@ static void age_active_anon(struct zone

memcg = mem_cgroup_iter(NULL, NULL, NULL);
do {
- struct mem_cgroup_zone mz = {
- .mem_cgroup = memcg,
- .zone = zone,
- };
+ struct lruvec *lruvec = mem_cgroup_zone_lruvec(zone, memcg);

- if (inactive_anon_is_low(&mz))
- shrink_active_list(SWAP_CLUSTER_MAX, &mz,
+ if (inactive_anon_is_low(lruvec))
+ shrink_active_list(SWAP_CLUSTER_MAX, lruvec,
sc, priority, 0);

memcg = mem_cgroup_iter(NULL, memcg, NULL);

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  Last update: 2012-02-21 00:33    [from the cache]
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