mm: memcontrol: report kernel stack usage in cgroup2 memory.stat
Show how much memory is allocated to kernel stacks.
Signed-off-by: Vladimir Davydov <vdavydov@virtuozzo.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/Documentation/cgroup-v2.txt b/Documentation/cgroup-v2.txt
index e4e0c1d..e2f4e79 100644
--- a/Documentation/cgroup-v2.txt
+++ b/Documentation/cgroup-v2.txt
@@ -843,6 +843,10 @@
Amount of memory used to cache filesystem data,
including tmpfs and shared memory.
+ kernel_stack
+
+ Amount of memory allocated to kernel stacks.
+
slab
Amount of memory used for storing in-kernel data
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index e7af483..d630031 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -52,9 +52,10 @@
MEM_CGROUP_STAT_SWAP, /* # of pages, swapped out */
MEM_CGROUP_STAT_NSTATS,
/* default hierarchy stats */
- MEMCG_SOCK = MEM_CGROUP_STAT_NSTATS,
+ MEMCG_KERNEL_STACK = MEM_CGROUP_STAT_NSTATS,
MEMCG_SLAB_RECLAIMABLE,
MEMCG_SLAB_UNRECLAIMABLE,
+ MEMCG_SOCK,
MEMCG_NR_STAT,
};
diff --git a/kernel/fork.c b/kernel/fork.c
index 2e391c7..accb722 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -164,12 +164,20 @@
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_info(struct thread_info *ti)
{
- free_kmem_pages((unsigned long)ti, THREAD_SIZE_ORDER);
+ struct page *page = virt_to_page(ti);
+
+ memcg_kmem_update_page_stat(page, MEMCG_KERNEL_STACK,
+ -(1 << THREAD_SIZE_ORDER));
+ __free_kmem_pages(page, THREAD_SIZE_ORDER);
}
# else
static struct kmem_cache *thread_info_cache;
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 3ad64bf..4b7dda7 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -5106,6 +5106,8 @@
(u64)stat[MEM_CGROUP_STAT_RSS] * PAGE_SIZE);
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);
seq_printf(m, "slab %llu\n",
(u64)(stat[MEMCG_SLAB_RECLAIMABLE] +
stat[MEMCG_SLAB_UNRECLAIMABLE]) * PAGE_SIZE);