Provide statistics on how much of a cgroup's memory footprint is made
up of socket buffers from network connections owned by the group.
Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx>
---
v2: add item description in cgroup.txt and rebase to updated 1/2
Documentation/cgroup.txt | 4 ++++
include/linux/memcontrol.h | 5 ++++-
mm/memcontrol.c | 6 ++++++
3 files changed, 14 insertions(+), 1 deletion(-)
diff --git a/Documentation/cgroup.txt b/Documentation/cgroup.txt
index 65b3eac..e8d25e7 100644
--- a/Documentation/cgroup.txt
+++ b/Documentation/cgroup.txt
@@ -843,6 +843,10 @@ PAGE_SIZE multiple when read back.
Amount of memory used to cache filesystem data,
including tmpfs and shared memory.
+ sock
+
+ Amount of memory used in network transmission buffers
+
file_mapped
Amount of cached filesystem data mapped with mmap()
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 1666617..9ae48d4 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -50,6 +50,9 @@ enum mem_cgroup_stat_index {
MEM_CGROUP_STAT_WRITEBACK, /* # of pages under writeback */
MEM_CGROUP_STAT_SWAP, /* # of pages, swapped out */
MEM_CGROUP_STAT_NSTATS,
+ /* default hierarchy stats */
+ MEMCG_SOCK,
+ MEMCG_NR_STAT,
};
struct mem_cgroup_reclaim_cookie {
@@ -87,7 +90,7 @@ enum mem_cgroup_events_target {
#ifdef CONFIG_MEMCG
struct mem_cgroup_stat_cpu {
- long count[MEM_CGROUP_STAT_NSTATS];
+ long count[MEMCG_NR_STAT];
unsigned long events[MEMCG_NR_EVENTS];
unsigned long nr_page_events;
unsigned long targets[MEM_CGROUP_NTARGETS];
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index cdb51a9..97e47de 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -5127,6 +5127,8 @@ static int memory_stat_show(struct seq_file *m, void *v)
(u64)tree_stat(memcg, MEM_CGROUP_STAT_RSS) * PAGE_SIZE);
seq_printf(m, "file %llu\n",
(u64)tree_stat(memcg, MEM_CGROUP_STAT_CACHE) * PAGE_SIZE);
+ seq_printf(m, "sock %llu\n",
+ (u64)tree_stat(memcg, MEMCG_SOCK) * PAGE_SIZE);
seq_printf(m, "file_mapped %llu\n",
(u64)tree_stat(memcg, MEM_CGROUP_STAT_FILE_MAPPED) *
@@ -5630,6 +5632,8 @@ bool mem_cgroup_charge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages)
if (in_softirq())
gfp_mask = GFP_NOWAIT;
+ this_cpu_add(memcg->stat->count[MEMCG_SOCK], nr_pages);
+
if (try_charge(memcg, gfp_mask, nr_pages) == 0)
return true;
@@ -5649,6 +5653,8 @@ void mem_cgroup_uncharge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages)
return;
}
+ this_cpu_sub(memcg->stat->count[MEMCG_SOCK], nr_pages);
+
page_counter_uncharge(&memcg->memory, nr_pages);
css_put_many(&memcg->css, nr_pages);
}
--
2.7.0
--
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