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Subject[PATCH RFC 04/14] mm: vmstat: convert slab vmstat counter to bytes
Date
In order to prepare for per-object slab memory accounting,
convert NR_SLAB_RECLAIMABLE and NR_SLAB_UNRECLAIMABLE vmstat
items to bytes.

To make sure that these vmstats are in bytes, rename them
to NR_SLAB_RECLAIMABLE_B and NR_SLAB_UNRECLAIMABLE_B (similar to
NR_KERNEL_STACK_KB).

The size of slab memory shouldn't exceed 4Gb on 32-bit machines,
so it will fit into atomic_long_t we use for vmstats.

Signed-off-by: Roman Gushchin <guro@fb.com>
---
drivers/base/node.c | 11 ++++++++---
fs/proc/meminfo.c | 4 ++--
include/linux/mmzone.h | 10 ++++++++--
include/linux/vmstat.h | 8 ++++++++
kernel/power/snapshot.c | 2 +-
mm/memcontrol.c | 29 ++++++++++++++++-------------
mm/oom_kill.c | 2 +-
mm/page_alloc.c | 8 ++++----
mm/slab.h | 15 ++++++++-------
mm/slab_common.c | 4 ++--
mm/slob.c | 12 ++++++------
mm/slub.c | 8 ++++----
mm/vmscan.c | 3 ++-
mm/vmstat.c | 22 +++++++++++++++++++---
mm/workingset.c | 6 ++++--
15 files changed, 93 insertions(+), 51 deletions(-)

diff --git a/drivers/base/node.c b/drivers/base/node.c
index 296546ffed6c..56664222f3fd 100644
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -368,8 +368,8 @@ static ssize_t node_read_meminfo(struct device *dev,
unsigned long sreclaimable, sunreclaimable;

si_meminfo_node(&i, nid);
- sreclaimable = node_page_state(pgdat, NR_SLAB_RECLAIMABLE);
- sunreclaimable = node_page_state(pgdat, NR_SLAB_UNRECLAIMABLE);
+ sreclaimable = node_page_state_pages(pgdat, NR_SLAB_RECLAIMABLE_B);
+ sunreclaimable = node_page_state_pages(pgdat, NR_SLAB_UNRECLAIMABLE_B);
n = sprintf(buf,
"Node %d MemTotal: %8lu kB\n"
"Node %d MemFree: %8lu kB\n"
@@ -495,9 +495,14 @@ static ssize_t node_read_vmstat(struct device *dev,
int i;
int n = 0;

- for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
+ for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) {
+ unsigned long x = sum_zone_node_page_state(nid, i);
+
+ if (vmstat_item_in_bytes(i))
+ x >>= PAGE_SHIFT;
n += sprintf(buf+n, "%s %lu\n", vmstat_text[i],
sum_zone_node_page_state(nid, i));
+ }

#ifdef CONFIG_NUMA
for (i = 0; i < NR_VM_NUMA_STAT_ITEMS; i++)
diff --git a/fs/proc/meminfo.c b/fs/proc/meminfo.c
index ac9247371871..87afa8683c1b 100644
--- a/fs/proc/meminfo.c
+++ b/fs/proc/meminfo.c
@@ -53,8 +53,8 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
pages[lru] = global_node_page_state(NR_LRU_BASE + lru);

available = si_mem_available();
- sreclaimable = global_node_page_state(NR_SLAB_RECLAIMABLE);
- sunreclaim = global_node_page_state(NR_SLAB_UNRECLAIMABLE);
+ sreclaimable = global_node_page_state_pages(NR_SLAB_RECLAIMABLE_B);
+ sunreclaim = global_node_page_state_pages(NR_SLAB_UNRECLAIMABLE_B);

show_val_kb(m, "MemTotal: ", i.totalram);
show_val_kb(m, "MemFree: ", i.freeram);
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 6e8233d52971..2dbc2d042ef6 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -215,8 +215,8 @@ enum node_stat_item {
NR_INACTIVE_FILE, /* " " " " " */
NR_ACTIVE_FILE, /* " " " " " */
NR_UNEVICTABLE, /* " " " " " */
- NR_SLAB_RECLAIMABLE, /* Please do not reorder this item */
- NR_SLAB_UNRECLAIMABLE, /* and this one without looking at
+ NR_SLAB_RECLAIMABLE_B, /* Please do not reorder this item */
+ NR_SLAB_UNRECLAIMABLE_B,/* and this one without looking at
* memcg_flush_percpu_vmstats() first. */
NR_ISOLATED_ANON, /* Temporary isolated pages from anon lru */
NR_ISOLATED_FILE, /* Temporary isolated pages from file lru */
@@ -247,6 +247,12 @@ enum node_stat_item {
NR_VM_NODE_STAT_ITEMS
};

+static __always_inline bool vmstat_item_in_bytes(enum node_stat_item item)
+{
+ return (item == NR_SLAB_RECLAIMABLE_B ||
+ item == NR_SLAB_UNRECLAIMABLE_B);
+}
+
/*
* We do arithmetic on the LRU lists in various places in the code,
* so it is important to keep the active lists LRU_ACTIVE higher in
diff --git a/include/linux/vmstat.h b/include/linux/vmstat.h
index bdeda4b079fe..e5460e597e0c 100644
--- a/include/linux/vmstat.h
+++ b/include/linux/vmstat.h
@@ -194,6 +194,12 @@ static inline unsigned long global_node_page_state(enum node_stat_item item)
return x;
}

+static inline
+unsigned long global_node_page_state_pages(enum node_stat_item item)
+{
+ return global_node_page_state(item) >> PAGE_SHIFT;
+}
+
static inline unsigned long zone_page_state(struct zone *zone,
enum zone_stat_item item)
{
@@ -234,6 +240,8 @@ extern unsigned long sum_zone_node_page_state(int node,
extern unsigned long sum_zone_numa_state(int node, enum numa_stat_item item);
extern unsigned long node_page_state(struct pglist_data *pgdat,
enum node_stat_item item);
+extern unsigned long node_page_state_pages(struct pglist_data *pgdat,
+ enum node_stat_item item);
#else
#define sum_zone_node_page_state(node, item) global_zone_page_state(item)
#define node_page_state(node, item) global_node_page_state(item)
diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
index 83105874f255..ce9e5686e745 100644
--- a/kernel/power/snapshot.c
+++ b/kernel/power/snapshot.c
@@ -1659,7 +1659,7 @@ static unsigned long minimum_image_size(unsigned long saveable)
{
unsigned long size;

- size = global_node_page_state(NR_SLAB_RECLAIMABLE)
+ size = global_node_page_state_pages(NR_SLAB_RECLAIMABLE_B)
+ global_node_page_state(NR_ACTIVE_ANON)
+ global_node_page_state(NR_INACTIVE_ANON)
+ global_node_page_state(NR_ACTIVE_FILE)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index cb9adb31360e..e4af9810b59e 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -759,13 +759,16 @@ mem_cgroup_largest_soft_limit_node(struct mem_cgroup_tree_per_node *mctz)
*/
void __mod_memcg_state(struct mem_cgroup *memcg, int idx, int val)
{
- long x;
+ long x, threshold = MEMCG_CHARGE_BATCH;

if (mem_cgroup_disabled())
return;

+ if (vmstat_item_in_bytes(idx))
+ threshold <<= PAGE_SHIFT;
+
x = val + __this_cpu_read(memcg->vmstats_percpu->stat[idx]);
- if (unlikely(abs(x) > MEMCG_CHARGE_BATCH)) {
+ if (unlikely(abs(x) > threshold)) {
struct mem_cgroup *mi;

/*
@@ -807,7 +810,7 @@ void __mod_lruvec_state(struct lruvec *lruvec, enum node_stat_item idx,
pg_data_t *pgdat = lruvec_pgdat(lruvec);
struct mem_cgroup_per_node *pn;
struct mem_cgroup *memcg;
- long x;
+ long x, threshold = MEMCG_CHARGE_BATCH;

/* Update node */
__mod_node_page_state(pgdat, idx, val);
@@ -824,8 +827,11 @@ void __mod_lruvec_state(struct lruvec *lruvec, enum node_stat_item idx,
/* Update lruvec */
__this_cpu_add(pn->lruvec_stat_local->count[idx], val);

+ if (vmstat_item_in_bytes(idx))
+ threshold <<= PAGE_SHIFT;
+
x = val + __this_cpu_read(pn->lruvec_stat_cpu->count[idx]);
- if (unlikely(abs(x) > MEMCG_CHARGE_BATCH)) {
+ if (unlikely(abs(x) > threshold)) {
struct mem_cgroup_per_node *pi;

for (pi = pn; pi; pi = parent_nodeinfo(pi, pgdat->node_id))
@@ -1478,9 +1484,8 @@ static char *memory_stat_format(struct mem_cgroup *memcg)
(u64)memcg_page_state(memcg, MEMCG_KERNEL_STACK_KB) *
1024);
seq_buf_printf(&s, "slab %llu\n",
- (u64)(memcg_page_state(memcg, NR_SLAB_RECLAIMABLE) +
- memcg_page_state(memcg, NR_SLAB_UNRECLAIMABLE)) *
- PAGE_SIZE);
+ (u64)(memcg_page_state(memcg, NR_SLAB_RECLAIMABLE_B) +
+ memcg_page_state(memcg, NR_SLAB_UNRECLAIMABLE_B)));
seq_buf_printf(&s, "sock %llu\n",
(u64)memcg_page_state(memcg, MEMCG_SOCK) *
PAGE_SIZE);
@@ -1514,11 +1519,9 @@ static char *memory_stat_format(struct mem_cgroup *memcg)
PAGE_SIZE);

seq_buf_printf(&s, "slab_reclaimable %llu\n",
- (u64)memcg_page_state(memcg, NR_SLAB_RECLAIMABLE) *
- PAGE_SIZE);
+ (u64)memcg_page_state(memcg, NR_SLAB_RECLAIMABLE_B));
seq_buf_printf(&s, "slab_unreclaimable %llu\n",
- (u64)memcg_page_state(memcg, NR_SLAB_UNRECLAIMABLE) *
- PAGE_SIZE);
+ (u64)memcg_page_state(memcg, NR_SLAB_UNRECLAIMABLE_B));

/* Accumulated memory events */

@@ -3564,8 +3567,8 @@ static void memcg_flush_percpu_vmstats(struct mem_cgroup *memcg, bool slab_only)
int min_idx, max_idx;

if (slab_only) {
- min_idx = NR_SLAB_RECLAIMABLE;
- max_idx = NR_SLAB_UNRECLAIMABLE;
+ min_idx = NR_SLAB_RECLAIMABLE_B;
+ max_idx = NR_SLAB_UNRECLAIMABLE_B;
} else {
min_idx = 0;
max_idx = MEMCG_NR_STAT;
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 314ce1a3cf25..61476bf0f147 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -183,7 +183,7 @@ static bool is_dump_unreclaim_slabs(void)
global_node_page_state(NR_ISOLATED_FILE) +
global_node_page_state(NR_UNEVICTABLE);

- return (global_node_page_state(NR_SLAB_UNRECLAIMABLE) > nr_lru);
+ return (global_node_page_state_pages(NR_SLAB_UNRECLAIMABLE_B) > nr_lru);
}

/**
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index c5d62f1c2851..9da8ee92c226 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5100,8 +5100,8 @@ long si_mem_available(void)
* items that are in use, and cannot be freed. Cap this estimate at the
* low watermark.
*/
- reclaimable = global_node_page_state(NR_SLAB_RECLAIMABLE) +
- global_node_page_state(NR_KERNEL_MISC_RECLAIMABLE);
+ reclaimable = global_node_page_state_pages(NR_SLAB_RECLAIMABLE_B) +
+ global_node_page_state(NR_KERNEL_MISC_RECLAIMABLE);
available += reclaimable - min(reclaimable / 2, wmark_low);

if (available < 0)
@@ -5245,8 +5245,8 @@ void show_free_areas(unsigned int filter, nodemask_t *nodemask)
global_node_page_state(NR_FILE_DIRTY),
global_node_page_state(NR_WRITEBACK),
global_node_page_state(NR_UNSTABLE_NFS),
- global_node_page_state(NR_SLAB_RECLAIMABLE),
- global_node_page_state(NR_SLAB_UNRECLAIMABLE),
+ global_node_page_state_pages(NR_SLAB_RECLAIMABLE_B),
+ global_node_page_state_pages(NR_SLAB_UNRECLAIMABLE_B),
global_node_page_state(NR_FILE_MAPPED),
global_node_page_state(NR_SHMEM),
global_zone_page_state(NR_PAGETABLE),
diff --git a/mm/slab.h b/mm/slab.h
index 68e455f2b698..7c5577c2b9ea 100644
--- a/mm/slab.h
+++ b/mm/slab.h
@@ -272,7 +272,7 @@ int __kmem_cache_alloc_bulk(struct kmem_cache *, gfp_t, size_t, void **);
static inline int cache_vmstat_idx(struct kmem_cache *s)
{
return (s->flags & SLAB_RECLAIM_ACCOUNT) ?
- NR_SLAB_RECLAIMABLE : NR_SLAB_UNRECLAIMABLE;
+ NR_SLAB_RECLAIMABLE_B : NR_SLAB_UNRECLAIMABLE_B;
}

#ifdef CONFIG_MEMCG_KMEM
@@ -360,7 +360,7 @@ static __always_inline int memcg_charge_slab(struct page *page,

if (unlikely(!memcg || mem_cgroup_is_root(memcg))) {
mod_node_page_state(page_pgdat(page), cache_vmstat_idx(s),
- (1 << order));
+ (PAGE_SIZE << order));
percpu_ref_get_many(&s->memcg_params.refcnt, 1 << order);
return 0;
}
@@ -370,7 +370,7 @@ static __always_inline int memcg_charge_slab(struct page *page,
goto out;

lruvec = mem_cgroup_lruvec(page_pgdat(page), memcg);
- mod_lruvec_state(lruvec, cache_vmstat_idx(s), 1 << order);
+ mod_lruvec_state(lruvec, cache_vmstat_idx(s), PAGE_SIZE << order);

/* transer try_charge() page references to kmem_cache */
percpu_ref_get_many(&s->memcg_params.refcnt, 1 << order);
@@ -394,11 +394,12 @@ static __always_inline void memcg_uncharge_slab(struct page *page, int order,
memcg = READ_ONCE(s->memcg_params.memcg);
if (likely(!mem_cgroup_is_root(memcg))) {
lruvec = mem_cgroup_lruvec(page_pgdat(page), memcg);
- mod_lruvec_state(lruvec, cache_vmstat_idx(s), -(1 << order));
+ mod_lruvec_state(lruvec, cache_vmstat_idx(s),
+ -(PAGE_SIZE << order));
memcg_kmem_uncharge_memcg(page, order, memcg);
} else {
mod_node_page_state(page_pgdat(page), cache_vmstat_idx(s),
- -(1 << order));
+ -(PAGE_SIZE << order));
}
rcu_read_unlock();

@@ -482,7 +483,7 @@ static __always_inline int charge_slab_page(struct page *page,
{
if (is_root_cache(s)) {
mod_node_page_state(page_pgdat(page), cache_vmstat_idx(s),
- 1 << order);
+ PAGE_SIZE << order);
return 0;
}

@@ -494,7 +495,7 @@ static __always_inline void uncharge_slab_page(struct page *page, int order,
{
if (is_root_cache(s)) {
mod_node_page_state(page_pgdat(page), cache_vmstat_idx(s),
- -(1 << order));
+ -(PAGE_SIZE << order));
return;
}

diff --git a/mm/slab_common.c b/mm/slab_common.c
index c29f03adca91..79695d9c34f3 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -1303,8 +1303,8 @@ void *kmalloc_order(size_t size, gfp_t flags, unsigned int order)
page = alloc_pages(flags, order);
if (likely(page)) {
ret = page_address(page);
- mod_node_page_state(page_pgdat(page), NR_SLAB_UNRECLAIMABLE,
- 1 << order);
+ mod_node_page_state(page_pgdat(page), NR_SLAB_UNRECLAIMABLE_B,
+ PAGE_SIZE << order);
}
ret = kasan_kmalloc_large(ret, size, flags);
/* As ret might get tagged, call kmemleak hook after KASAN. */
diff --git a/mm/slob.c b/mm/slob.c
index fa53e9f73893..8b7b56235438 100644
--- a/mm/slob.c
+++ b/mm/slob.c
@@ -202,8 +202,8 @@ static void *slob_new_pages(gfp_t gfp, int order, int node)
if (!page)
return NULL;

- mod_node_page_state(page_pgdat(page), NR_SLAB_UNRECLAIMABLE,
- 1 << order);
+ mod_node_page_state(page_pgdat(page), NR_SLAB_UNRECLAIMABLE_B,
+ PAGE_SIZE << order);
return page_address(page);
}

@@ -214,8 +214,8 @@ static void slob_free_pages(void *b, int order)
if (current->reclaim_state)
current->reclaim_state->reclaimed_slab += 1 << order;

- mod_node_page_state(page_pgdat(sp), NR_SLAB_UNRECLAIMABLE,
- -(1 << order));
+ mod_node_page_state(page_pgdat(sp), NR_SLAB_UNRECLAIMABLE_B,
+ -(PAGE_SIZE << order));
__free_pages(sp, order);
}

@@ -550,8 +550,8 @@ void kfree(const void *block)
slob_free(m, *m + align);
} else {
unsigned int order = compound_order(sp);
- mod_node_page_state(page_pgdat(sp), NR_SLAB_UNRECLAIMABLE,
- -(1 << order));
+ mod_node_page_state(page_pgdat(sp), NR_SLAB_UNRECLAIMABLE_B,
+ -(PAGE_SIZE << order));
__free_pages(sp, order);

}
diff --git a/mm/slub.c b/mm/slub.c
index c9856a9807f1..0873b77727bf 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -3825,8 +3825,8 @@ static void *kmalloc_large_node(size_t size, gfp_t flags, int node)
page = alloc_pages_node(node, flags, order);
if (page) {
ptr = page_address(page);
- mod_node_page_state(page_pgdat(page), NR_SLAB_UNRECLAIMABLE,
- 1 << order);
+ mod_node_page_state(page_pgdat(page), NR_SLAB_UNRECLAIMABLE_B,
+ PAGE_SIZE << order);
}

return kmalloc_large_node_hook(ptr, size, flags);
@@ -3957,8 +3957,8 @@ void kfree(const void *x)

BUG_ON(!PageCompound(page));
kfree_hook(object);
- mod_node_page_state(page_pgdat(page), NR_SLAB_UNRECLAIMABLE,
- -(1 << order));
+ mod_node_page_state(page_pgdat(page), NR_SLAB_UNRECLAIMABLE_B,
+ -(PAGE_SIZE << order));
__free_pages(page, order);
return;
}
diff --git a/mm/vmscan.c b/mm/vmscan.c
index ee47bbcb99b5..283da9a39de2 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -4272,7 +4272,8 @@ int node_reclaim(struct pglist_data *pgdat, gfp_t gfp_mask, unsigned int order)
* unmapped file backed pages.
*/
if (node_pagecache_reclaimable(pgdat) <= pgdat->min_unmapped_pages &&
- node_page_state(pgdat, NR_SLAB_RECLAIMABLE) <= pgdat->min_slab_pages)
+ node_page_state_pages(pgdat, NR_SLAB_RECLAIMABLE_B) <=
+ pgdat->min_slab_pages)
return NODE_RECLAIM_FULL;

/*
diff --git a/mm/vmstat.c b/mm/vmstat.c
index 98f43725d910..d04f53997fd2 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -344,6 +344,8 @@ void __mod_node_page_state(struct pglist_data *pgdat, enum node_stat_item item,
x = delta + __this_cpu_read(*p);

t = __this_cpu_read(pcp->stat_threshold);
+ if (vmstat_item_in_bytes(item))
+ t <<= PAGE_SHIFT;

if (unlikely(x > t || x < -t)) {
node_page_state_add(x, pgdat, item);
@@ -555,6 +557,8 @@ static inline void mod_node_state(struct pglist_data *pgdat,
* for all cpus in a node.
*/
t = this_cpu_read(pcp->stat_threshold);
+ if (vmstat_item_in_bytes(item))
+ t <<= PAGE_SHIFT;

o = this_cpu_read(*p);
n = delta + o;
@@ -999,6 +1003,12 @@ unsigned long node_page_state(struct pglist_data *pgdat,
#endif
return x;
}
+
+unsigned long node_page_state_pages(struct pglist_data *pgdat,
+ enum node_stat_item item)
+{
+ return node_page_state(pgdat, item) >> PAGE_SHIFT;
+}
#endif

#ifdef CONFIG_COMPACTION
@@ -1547,10 +1557,13 @@ static void zoneinfo_show_print(struct seq_file *m, pg_data_t *pgdat,
if (is_zone_first_populated(pgdat, zone)) {
seq_printf(m, "\n per-node stats");
for (i = 0; i < NR_VM_NODE_STAT_ITEMS; i++) {
+ unsigned long x = node_page_state(pgdat, i);
+
+ if (vmstat_item_in_bytes(i))
+ x >>= PAGE_SHIFT;
seq_printf(m, "\n %-12s %lu",
vmstat_text[i + NR_VM_ZONE_STAT_ITEMS +
- NR_VM_NUMA_STAT_ITEMS],
- node_page_state(pgdat, i));
+ NR_VM_NUMA_STAT_ITEMS], x);
}
}
seq_printf(m,
@@ -1679,8 +1692,11 @@ static void *vmstat_start(struct seq_file *m, loff_t *pos)
v += NR_VM_NUMA_STAT_ITEMS;
#endif

- for (i = 0; i < NR_VM_NODE_STAT_ITEMS; i++)
+ for (i = 0; i < NR_VM_NODE_STAT_ITEMS; i++) {
v[i] = global_node_page_state(i);
+ if (vmstat_item_in_bytes(i))
+ v[i] >>= PAGE_SHIFT;
+ }
v += NR_VM_NODE_STAT_ITEMS;

global_dirty_limits(v + NR_DIRTY_BG_THRESHOLD,
diff --git a/mm/workingset.c b/mm/workingset.c
index c963831d354f..675792387e58 100644
--- a/mm/workingset.c
+++ b/mm/workingset.c
@@ -430,8 +430,10 @@ static unsigned long count_shadow_nodes(struct shrinker *shrinker,
for (pages = 0, i = 0; i < NR_LRU_LISTS; i++)
pages += lruvec_page_state_local(lruvec,
NR_LRU_BASE + i);
- pages += lruvec_page_state_local(lruvec, NR_SLAB_RECLAIMABLE);
- pages += lruvec_page_state_local(lruvec, NR_SLAB_UNRECLAIMABLE);
+ pages += lruvec_page_state_local(
+ lruvec, NR_SLAB_RECLAIMABLE_B) >> PAGE_SHIFT;
+ pages += lruvec_page_state_local(
+ lruvec, NR_SLAB_UNRECLAIMABLE_B) >> PAGE_SHIFT;
} else
#endif
pages = node_present_pages(sc->nid);
--
2.21.0
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