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Subject[PATCH] mm: memcontrol: account kernel stack per node
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Currently the kernel stack is being accounted per-zone. There is no need
to do that. In addition due to being per-zone, memcg has to keep a
separate MEMCG_KERNEL_STACK_KB. Make the stat per-node and deprecate
MEMCG_KERNEL_STACK_KB as memcg_stat_item is an extension of
node_stat_item.

Signed-off-by: Shakeel Butt <shakeelb@google.com>
---
drivers/base/node.c | 4 ++--
fs/proc/meminfo.c | 4 ++--
include/linux/memcontrol.h | 2 --
include/linux/mmzone.h | 8 ++++----
kernel/fork.c | 29 ++++++++++-------------------
kernel/scs.c | 2 +-
mm/memcontrol.c | 2 +-
mm/page_alloc.c | 16 ++++++++--------
mm/vmstat.c | 8 ++++----
9 files changed, 32 insertions(+), 43 deletions(-)

diff --git a/drivers/base/node.c b/drivers/base/node.c
index 0cf13e31603c..508b80f6329b 100644
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -440,9 +440,9 @@ static ssize_t node_read_meminfo(struct device *dev,
nid, K(node_page_state(pgdat, NR_FILE_MAPPED)),
nid, K(node_page_state(pgdat, NR_ANON_MAPPED)),
nid, K(i.sharedram),
- nid, sum_zone_node_page_state(nid, NR_KERNEL_STACK_KB),
+ nid, node_page_state(pgdat, NR_KERNEL_STACK_KB),
#ifdef CONFIG_SHADOW_CALL_STACK
- nid, sum_zone_node_page_state(nid, NR_KERNEL_SCS_KB),
+ nid, node_page_state(pgdat, NR_KERNEL_SCS_KB),
#endif
nid, K(sum_zone_node_page_state(nid, NR_PAGETABLE)),
nid, 0UL,
diff --git a/fs/proc/meminfo.c b/fs/proc/meminfo.c
index f262bff3ca31..887a5532e449 100644
--- a/fs/proc/meminfo.c
+++ b/fs/proc/meminfo.c
@@ -101,10 +101,10 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
show_val_kb(m, "SReclaimable: ", sreclaimable);
show_val_kb(m, "SUnreclaim: ", sunreclaim);
seq_printf(m, "KernelStack: %8lu kB\n",
- global_zone_page_state(NR_KERNEL_STACK_KB));
+ global_node_page_state(NR_KERNEL_STACK_KB));
#ifdef CONFIG_SHADOW_CALL_STACK
seq_printf(m, "ShadowCallStack:%8lu kB\n",
- global_zone_page_state(NR_KERNEL_SCS_KB));
+ global_node_page_state(NR_KERNEL_SCS_KB));
#endif
show_val_kb(m, "PageTables: ",
global_zone_page_state(NR_PAGETABLE));
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index ba1e42715ecf..a3ddb236898e 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -33,8 +33,6 @@ enum memcg_stat_item {
MEMCG_SWAP = NR_VM_NODE_STAT_ITEMS,
MEMCG_SOCK,
MEMCG_PERCPU_B,
- /* XXX: why are these zone and not node counters? */
- MEMCG_KERNEL_STACK_KB,
MEMCG_NR_STAT,
};

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 8e859444927a..b79f73ce8b57 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -153,10 +153,6 @@ enum zone_stat_item {
NR_ZONE_WRITE_PENDING, /* Count of dirty, writeback and unstable pages */
NR_MLOCK, /* mlock()ed pages found and moved off LRU */
NR_PAGETABLE, /* used for pagetables */
- NR_KERNEL_STACK_KB, /* measured in KiB */
-#if IS_ENABLED(CONFIG_SHADOW_CALL_STACK)
- NR_KERNEL_SCS_KB, /* measured in KiB */
-#endif
/* Second 128 byte cacheline */
NR_BOUNCE,
#if IS_ENABLED(CONFIG_ZSMALLOC)
@@ -201,6 +197,10 @@ enum node_stat_item {
NR_KERNEL_MISC_RECLAIMABLE, /* reclaimable non-slab kernel pages */
NR_FOLL_PIN_ACQUIRED, /* via: pin_user_page(), gup flag: FOLL_PIN */
NR_FOLL_PIN_RELEASED, /* pages returned via unpin_user_page() */
+ NR_KERNEL_STACK_KB, /* measured in KiB */
+#if IS_ENABLED(CONFIG_SHADOW_CALL_STACK)
+ NR_KERNEL_SCS_KB, /* measured in KiB */
+#endif
NR_VM_NODE_STAT_ITEMS
};

diff --git a/kernel/fork.c b/kernel/fork.c
index 73fdfa9674b5..ee5393350ef7 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -278,7 +278,7 @@ static inline void free_thread_stack(struct task_struct *tsk)

for (i = 0; i < THREAD_SIZE / PAGE_SIZE; i++) {
mod_memcg_page_state(vm->pages[i],
- MEMCG_KERNEL_STACK_KB,
+ NR_KERNEL_STACK_KB,
-(int)(PAGE_SIZE / 1024));

memcg_kmem_uncharge_page(vm->pages[i], 0);
@@ -381,32 +381,23 @@ static void account_kernel_stack(struct task_struct *tsk, int account)
{
void *stack = task_stack_page(tsk);
struct vm_struct *vm = task_stack_vm_area(tsk);
+ struct page *page;

BUILD_BUG_ON(IS_ENABLED(CONFIG_VMAP_STACK) && PAGE_SIZE % 1024 != 0);

if (vm) {
- int i;
-
BUG_ON(vm->nr_pages != THREAD_SIZE / PAGE_SIZE);
+ page = vm->pages[0];

- for (i = 0; i < THREAD_SIZE / PAGE_SIZE; i++) {
- mod_zone_page_state(page_zone(vm->pages[i]),
- NR_KERNEL_STACK_KB,
- PAGE_SIZE / 1024 * account);
- }
} else {
- /*
- * All stack pages are in the same zone and belong to the
- * same memcg.
- */
- struct page *first_page = virt_to_page(stack);
-
- mod_zone_page_state(page_zone(first_page), NR_KERNEL_STACK_KB,
- THREAD_SIZE / 1024 * account);
-
- mod_memcg_obj_state(stack, MEMCG_KERNEL_STACK_KB,
+ page = virt_to_page(stack);
+ mod_memcg_obj_state(stack, NR_KERNEL_STACK_KB,
account * (THREAD_SIZE / 1024));
}
+
+ /* All stack pages are in the same node. */
+ mod_node_page_state(page_pgdat(page), NR_KERNEL_STACK_KB,
+ THREAD_SIZE / 1024 * account);
}

static int memcg_charge_kernel_stack(struct task_struct *tsk)
@@ -431,7 +422,7 @@ static int memcg_charge_kernel_stack(struct task_struct *tsk)
return ret;

mod_memcg_page_state(vm->pages[i],
- MEMCG_KERNEL_STACK_KB,
+ NR_KERNEL_STACK_KB,
PAGE_SIZE / 1024);
}
}
diff --git a/kernel/scs.c b/kernel/scs.c
index 5d4d9bbdec36..4ff4a7ba0094 100644
--- a/kernel/scs.c
+++ b/kernel/scs.c
@@ -17,7 +17,7 @@ static void __scs_account(void *s, int account)
{
struct page *scs_page = virt_to_page(s);

- mod_zone_page_state(page_zone(scs_page), NR_KERNEL_SCS_KB,
+ mod_node_page_state(page_pgdat(scs_page), NR_KERNEL_SCS_KB,
account * (SCS_SIZE / SZ_1K));
}

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index b1a644224383..06de63901f81 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1485,7 +1485,7 @@ static char *memory_stat_format(struct mem_cgroup *memcg)
(u64)memcg_page_state(memcg, NR_FILE_PAGES) *
PAGE_SIZE);
seq_buf_printf(&s, "kernel_stack %llu\n",
- (u64)memcg_page_state(memcg, MEMCG_KERNEL_STACK_KB) *
+ (u64)memcg_page_state(memcg, NR_KERNEL_STACK_KB) *
1024);
seq_buf_printf(&s, "slab %llu\n",
(u64)(memcg_page_state(memcg, NR_SLAB_RECLAIMABLE_B) +
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 174c849ba9f2..0568b126f719 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5402,6 +5402,10 @@ void show_free_areas(unsigned int filter, nodemask_t *nodemask)
" anon_thp: %lukB"
#endif
" writeback_tmp:%lukB"
+ " kernel_stack:%lukB"
+#ifdef CONFIG_SHADOW_CALL_STACK
+ " shadow_call_stack:%lukB"
+#endif
" all_unreclaimable? %s"
"\n",
pgdat->node_id,
@@ -5423,6 +5427,10 @@ void show_free_areas(unsigned int filter, nodemask_t *nodemask)
K(node_page_state(pgdat, NR_ANON_THPS) * HPAGE_PMD_NR),
#endif
K(node_page_state(pgdat, NR_WRITEBACK_TEMP)),
+ node_page_state(pgdat, NR_KERNEL_STACK_KB),
+#ifdef CONFIG_SHADOW_CALL_STACK
+ node_page_state(pgdat, NR_KERNEL_SCS_KB),
+#endif
pgdat->kswapd_failures >= MAX_RECLAIM_RETRIES ?
"yes" : "no");
}
@@ -5454,10 +5462,6 @@ void show_free_areas(unsigned int filter, nodemask_t *nodemask)
" present:%lukB"
" managed:%lukB"
" mlocked:%lukB"
- " kernel_stack:%lukB"
-#ifdef CONFIG_SHADOW_CALL_STACK
- " shadow_call_stack:%lukB"
-#endif
" pagetables:%lukB"
" bounce:%lukB"
" free_pcp:%lukB"
@@ -5479,10 +5483,6 @@ void show_free_areas(unsigned int filter, nodemask_t *nodemask)
K(zone->present_pages),
K(zone_managed_pages(zone)),
K(zone_page_state(zone, NR_MLOCK)),
- zone_page_state(zone, NR_KERNEL_STACK_KB),
-#ifdef CONFIG_SHADOW_CALL_STACK
- zone_page_state(zone, NR_KERNEL_SCS_KB),
-#endif
K(zone_page_state(zone, NR_PAGETABLE)),
K(zone_page_state(zone, NR_BOUNCE)),
K(free_pcp),
diff --git a/mm/vmstat.c b/mm/vmstat.c
index 2c5a96694490..96bf8bfffd1d 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -1158,10 +1158,6 @@ const char * const vmstat_text[] = {
"nr_zone_write_pending",
"nr_mlock",
"nr_page_table_pages",
- "nr_kernel_stack",
-#if IS_ENABLED(CONFIG_SHADOW_CALL_STACK)
- "nr_shadow_call_stack",
-#endif
"nr_bounce",
#if IS_ENABLED(CONFIG_ZSMALLOC)
"nr_zspages",
@@ -1212,6 +1208,10 @@ const char * const vmstat_text[] = {
"nr_kernel_misc_reclaimable",
"nr_foll_pin_acquired",
"nr_foll_pin_released",
+ "nr_kernel_stack",
+#if IS_ENABLED(CONFIG_SHADOW_CALL_STACK)
+ "nr_shadow_call_stack",
+#endif

/* enum writeback_stat_item counters */
"nr_dirty_threshold",
--
2.27.0.212.ge8ba1cc988-goog
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