* [PATCH 1/4] mm: Track NR_KERNEL_STACK in KiB instead of number of stacks
[not found] <cover.1468523549.git.luto@kernel.org>
@ 2016-07-14 19:14 ` Andy Lutomirski
2016-07-14 19:22 ` Johannes Weiner
2016-07-14 19:14 ` [PATCH 2/4] mm: Fix memcg stack accounting for sub-page stacks Andy Lutomirski
1 sibling, 1 reply; 5+ messages in thread
From: Andy Lutomirski @ 2016-07-14 19:14 UTC (permalink / raw)
To: Andrew Morton
Cc: x86, linux-kernel, Brian Gerst, Andy Lutomirski,
Vladimir Davydov, Johannes Weiner, Michal Hocko, linux-mm
Currently, NR_KERNEL_STACK tracks the number of kernel stacks in a
zone. This only makes sense if each kernel stack exists entirely in
one zone, and allowing vmapped stacks could break this assumption.
Since frv has THREAD_SIZE < PAGE_SIZE, we need to track kernel stack
allocations in a unit that divides both THREAD_SIZE and PAGE_SIZE on
all architectures. Keep it simple and use KiB.
Cc: Vladimir Davydov <vdavydov@virtuozzo.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: linux-mm@kvack.org
Reviewed-by: Josh Poimboeuf <jpoimboe@redhat.com>
Reviewed-by: Vladimir Davydov <vdavydov@virtuozzo.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Andy Lutomirski <luto@kernel.org>
---
drivers/base/node.c | 3 +--
fs/proc/meminfo.c | 2 +-
include/linux/mmzone.h | 2 +-
kernel/fork.c | 3 ++-
mm/page_alloc.c | 3 +--
5 files changed, 6 insertions(+), 7 deletions(-)
diff --git a/drivers/base/node.c b/drivers/base/node.c
index 560751bad294..27dc68a0ed2d 100644
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -121,8 +121,7 @@ static ssize_t node_read_meminfo(struct device *dev,
nid, K(node_page_state(nid, NR_FILE_MAPPED)),
nid, K(node_page_state(nid, NR_ANON_PAGES)),
nid, K(i.sharedram),
- nid, node_page_state(nid, NR_KERNEL_STACK) *
- THREAD_SIZE / 1024,
+ nid, node_page_state(nid, NR_KERNEL_STACK_KB),
nid, K(node_page_state(nid, NR_PAGETABLE)),
nid, K(node_page_state(nid, NR_UNSTABLE_NFS)),
nid, K(node_page_state(nid, NR_BOUNCE)),
diff --git a/fs/proc/meminfo.c b/fs/proc/meminfo.c
index 83720460c5bc..239b5a06cee0 100644
--- a/fs/proc/meminfo.c
+++ b/fs/proc/meminfo.c
@@ -145,7 +145,7 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
global_page_state(NR_SLAB_UNRECLAIMABLE)),
K(global_page_state(NR_SLAB_RECLAIMABLE)),
K(global_page_state(NR_SLAB_UNRECLAIMABLE)),
- global_page_state(NR_KERNEL_STACK) * THREAD_SIZE / 1024,
+ global_page_state(NR_KERNEL_STACK_KB),
K(global_page_state(NR_PAGETABLE)),
#ifdef CONFIG_QUICKLIST
K(quicklist_total_size()),
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 02069c23486d..63f05a7efb54 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -127,7 +127,7 @@ enum zone_stat_item {
NR_SLAB_RECLAIMABLE,
NR_SLAB_UNRECLAIMABLE,
NR_PAGETABLE, /* used for pagetables */
- NR_KERNEL_STACK,
+ NR_KERNEL_STACK_KB, /* measured in KiB */
/* Second 128 byte cacheline */
NR_UNSTABLE_NFS, /* NFS unstable pages */
NR_BOUNCE,
diff --git a/kernel/fork.c b/kernel/fork.c
index 4a7ec0c6c88c..466ba8febe3b 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -225,7 +225,8 @@ static void account_kernel_stack(unsigned long *stack, int account)
{
struct zone *zone = page_zone(virt_to_page(stack));
- mod_zone_page_state(zone, NR_KERNEL_STACK, account);
+ mod_zone_page_state(zone, NR_KERNEL_STACK_KB,
+ THREAD_SIZE / 1024 * account);
}
void free_task(struct task_struct *tsk)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 6903b695ebae..a277dea926c9 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4457,8 +4457,7 @@ void show_free_areas(unsigned int filter)
K(zone_page_state(zone, NR_SHMEM)),
K(zone_page_state(zone, NR_SLAB_RECLAIMABLE)),
K(zone_page_state(zone, NR_SLAB_UNRECLAIMABLE)),
- zone_page_state(zone, NR_KERNEL_STACK) *
- THREAD_SIZE / 1024,
+ zone_page_state(zone, NR_KERNEL_STACK_KB),
K(zone_page_state(zone, NR_PAGETABLE)),
K(zone_page_state(zone, NR_UNSTABLE_NFS)),
K(zone_page_state(zone, NR_BOUNCE)),
--
2.7.4
--
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^ permalink raw reply related [flat|nested] 5+ messages in thread* [PATCH 2/4] mm: Fix memcg stack accounting for sub-page stacks
[not found] <cover.1468523549.git.luto@kernel.org>
2016-07-14 19:14 ` [PATCH 1/4] mm: Track NR_KERNEL_STACK in KiB instead of number of stacks Andy Lutomirski
@ 2016-07-14 19:14 ` Andy Lutomirski
2016-07-14 19:24 ` Johannes Weiner
2016-07-14 20:53 ` Andrew Morton
1 sibling, 2 replies; 5+ messages in thread
From: Andy Lutomirski @ 2016-07-14 19:14 UTC (permalink / raw)
To: Andrew Morton
Cc: x86, linux-kernel, Brian Gerst, Andy Lutomirski,
Vladimir Davydov, Johannes Weiner, Michal Hocko, linux-mm
We should account for stacks regardless of stack size, and we need
to account in sub-page units if THREAD_SIZE < PAGE_SIZE. Change the
units to kilobytes and Move it into account_kernel_stack().
Fixes: 12580e4b54ba8 ("mm: memcontrol: report kernel stack usage in cgroup2 memory.stat")
Cc: Vladimir Davydov <vdavydov@virtuozzo.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: linux-mm@kvack.org
Reviewed-by: Josh Poimboeuf <jpoimboe@redhat.com>
Reviewed-by: Vladimir Davydov <vdavydov@virtuozzo.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Andy Lutomirski <luto@kernel.org>
---
include/linux/memcontrol.h | 2 +-
kernel/fork.c | 19 ++++++++-----------
mm/memcontrol.c | 2 +-
3 files changed, 10 insertions(+), 13 deletions(-)
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index a805474df4ab..3b653b86bb8f 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -52,7 +52,7 @@ enum mem_cgroup_stat_index {
MEM_CGROUP_STAT_SWAP, /* # of pages, swapped out */
MEM_CGROUP_STAT_NSTATS,
/* default hierarchy stats */
- MEMCG_KERNEL_STACK = MEM_CGROUP_STAT_NSTATS,
+ MEMCG_KERNEL_STACK_KB = MEM_CGROUP_STAT_NSTATS,
MEMCG_SLAB_RECLAIMABLE,
MEMCG_SLAB_UNRECLAIMABLE,
MEMCG_SOCK,
diff --git a/kernel/fork.c b/kernel/fork.c
index 466ba8febe3b..146c9840c079 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -165,20 +165,12 @@ static unsigned long *alloc_thread_stack_node(struct task_struct *tsk,
struct page *page = alloc_kmem_pages_node(node, THREADINFO_GFP,
THREAD_SIZE_ORDER);
- if (page)
- memcg_kmem_update_page_stat(page, MEMCG_KERNEL_STACK,
- 1 << THREAD_SIZE_ORDER);
-
return page ? page_address(page) : NULL;
}
static inline void free_thread_stack(unsigned long *stack)
{
- struct page *page = virt_to_page(stack);
-
- memcg_kmem_update_page_stat(page, MEMCG_KERNEL_STACK,
- -(1 << THREAD_SIZE_ORDER));
- __free_kmem_pages(page, THREAD_SIZE_ORDER);
+ free_kmem_pages((unsigned long)stack, THREAD_SIZE_ORDER);
}
# else
static struct kmem_cache *thread_stack_cache;
@@ -223,10 +215,15 @@ static struct kmem_cache *mm_cachep;
static void account_kernel_stack(unsigned long *stack, int account)
{
- struct zone *zone = page_zone(virt_to_page(stack));
+ /* 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(zone, NR_KERNEL_STACK_KB,
+ mod_zone_page_state(page_zone(first_page), NR_KERNEL_STACK_KB,
THREAD_SIZE / 1024 * account);
+
+ memcg_kmem_update_page_stat(
+ first_page, MEMCG_KERNEL_STACK_KB,
+ account * (THREAD_SIZE / 1024));
}
void free_task(struct task_struct *tsk)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index ac8664db3823..ee44afc1f2d0 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -5133,7 +5133,7 @@ static int memory_stat_show(struct seq_file *m, void *v)
seq_printf(m, "file %llu\n",
(u64)stat[MEM_CGROUP_STAT_CACHE] * PAGE_SIZE);
seq_printf(m, "kernel_stack %llu\n",
- (u64)stat[MEMCG_KERNEL_STACK] * PAGE_SIZE);
+ (u64)stat[MEMCG_KERNEL_STACK_KB] * 1024);
seq_printf(m, "slab %llu\n",
(u64)(stat[MEMCG_SLAB_RECLAIMABLE] +
stat[MEMCG_SLAB_UNRECLAIMABLE]) * PAGE_SIZE);
--
2.7.4
--
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^ permalink raw reply related [flat|nested] 5+ messages in thread