This patch introduces kmem.tcp.failcnt file, living in the
kmem_cgroup filesystem. Following the pattern in the other
memcg resources, this files keeps a counter of how many times
allocation failed due to limits being hit in this cgroup.
The root cgroup will always show a failcnt of 0.
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>
---
mm/memcontrol.c | 13 +++++++++++++
1 files changed, 13 insertions(+), 0 deletions(-)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 51b5a55..9394224 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -517,6 +517,7 @@ static int mem_cgroup_write(struct cgroup *cont, struct cftype *cft,
const char *buffer);
static u64 mem_cgroup_read(struct cgroup *cont, struct cftype *cft);
+static int mem_cgroup_reset(struct cgroup *cont, unsigned int event);
/*
* We need those things internally in pages, so don't reuse
* mem_cgroup_{read,write}
@@ -533,6 +534,12 @@ static struct cftype tcp_files[] = {
.read_u64 = mem_cgroup_read,
.private = MEMFILE_PRIVATE(_KMEM_TCP, RES_USAGE),
},
+ {
+ .name = "kmem.tcp.failcnt",
+ .private = MEMFILE_PRIVATE(_KMEM_TCP, RES_FAILCNT),
+ .trigger = mem_cgroup_reset,
+ .read_u64 = mem_cgroup_read,
+ },
};
static void tcp_create_cgroup(struct mem_cgroup *cg, struct cgroup_subsys *ss)
@@ -4134,6 +4141,8 @@ static u64 mem_cgroup_read(struct cgroup *cont, struct cftype *cft)
if (mem_cgroup_is_root(mem)) {
if (name == RES_USAGE)
val = atomic_long_read(&tcp_memory_allocated) << PAGE_SHIFT;
+ else if (name == RES_FAILCNT)
+ val = 0;
else
val = RESOURCE_MAX;
} else
@@ -4251,6 +4260,10 @@ static int mem_cgroup_reset(struct cgroup *cont, unsigned int event)
case RES_FAILCNT:
if (type == _MEM)
res_counter_reset_failcnt(&mem->res);
+#if defined(CONFIG_CGROUP_MEM_RES_CTLR_KMEM) && defined(CONFIG_INET)
+ else if (type == _KMEM_TCP)
+ res_counter_reset_failcnt(&mem->tcp.tcp_memory_allocated);
+#endif
else
res_counter_reset_failcnt(&mem->memsw);
break;
--
1.7.6.4
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