This patch introduces kmem.tcp.usage_in_bytes file, living in the
kmem_cgroup filesystem. It is a simple read-only file that displays the
amount of kernel memory currently consumed by the cgroup.
Signed-off-by: Glauber Costa <glommer@xxxxxxxxxxxxx>
CC: David S. Miller <davem@xxxxxxxxxxxxx>
CC: Hiroyouki Kamezawa <kamezawa.hiroyu@xxxxxxxxxxxxxx>
CC: Eric W. Biederman <ebiederm@xxxxxxxxxxxx>
---
Documentation/cgroups/memory.txt | 1 +
mm/memcontrol.c | 14 +++++++++++---
2 files changed, 12 insertions(+), 3 deletions(-)
diff --git a/Documentation/cgroups/memory.txt b/Documentation/cgroups/memory.txt
index c1db134..00f1a88 100644
--- a/Documentation/cgroups/memory.txt
+++ b/Documentation/cgroups/memory.txt
@@ -79,6 +79,7 @@ Brief summary of control files.
memory.independent_kmem_limit # select whether or not kernel memory limits are
independent of user limits
memory.kmem.tcp.limit_in_bytes # set/show hard limit for tcp buf memory
+ memory.kmem.tcp.usage_in_bytes # show current tcp buf memory allocation
1. History
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index ee122a6..51b5a55 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -528,6 +528,11 @@ static struct cftype tcp_files[] = {
.read_u64 = mem_cgroup_read,
.private = MEMFILE_PRIVATE(_KMEM_TCP, RES_LIMIT),
},
+ {
+ .name = "kmem.tcp.usage_in_bytes",
+ .read_u64 = mem_cgroup_read,
+ .private = MEMFILE_PRIVATE(_KMEM_TCP, RES_USAGE),
+ },
};
static void tcp_create_cgroup(struct mem_cgroup *cg, struct cgroup_subsys *ss)
@@ -4126,9 +4131,12 @@ static u64 mem_cgroup_read(struct cgroup *cont, struct cftype *cft)
#if defined(CONFIG_CGROUP_MEM_RES_CTLR_KMEM) && defined(CONFIG_INET)
case _KMEM_TCP:
/* Be explicit: tcp root does not have a res_counter */
- if (mem_cgroup_is_root(mem))
- val = RESOURCE_MAX;
- else
+ if (mem_cgroup_is_root(mem)) {
+ if (name == RES_USAGE)
+ val = atomic_long_read(&tcp_memory_allocated) << PAGE_SHIFT;
+ else
+ val = RESOURCE_MAX;
+ } else
val = res_counter_read_u64(&mem->tcp.tcp_memory_allocated, name);
break;
#endif
--
1.7.6.4
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