diff options
| author | Glauber Costa <glommer@parallels.com> | 2011-12-11 21:47:08 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2011-12-12 19:04:11 -0500 |
| commit | ffea59e50494198a0db4d6ad8f6721b8fd994f65 (patch) | |
| tree | 371719583a5a14bc1a86e0e6247e9dd04ce79774 /net/ipv4/tcp_memcontrol.c | |
| parent | 5a6dd343770d2ae2c25f7a4b1998c091e6252f42 (diff) | |
Display current tcp failcnt in kmem cgroup
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@parallels.com>
Reviewed-by: Hiroyouki Kamezawa <kamezawa.hiroyu@jp.fujitsu.com>
CC: David S. Miller <davem@davemloft.net>
CC: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp_memcontrol.c')
| -rw-r--r-- | net/ipv4/tcp_memcontrol.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/net/ipv4/tcp_memcontrol.c b/net/ipv4/tcp_memcontrol.c index 9481f235803..d438fba31ba 100644 --- a/net/ipv4/tcp_memcontrol.c +++ b/net/ipv4/tcp_memcontrol.c @@ -9,6 +9,7 @@ static u64 tcp_cgroup_read(struct cgroup *cont, struct cftype *cft); static int tcp_cgroup_write(struct cgroup *cont, struct cftype *cft, const char *buffer); +static int tcp_cgroup_reset(struct cgroup *cont, unsigned int event); static struct cftype tcp_files[] = { { @@ -22,6 +23,12 @@ static struct cftype tcp_files[] = { .read_u64 = tcp_cgroup_read, .private = RES_USAGE, }, + { + .name = "kmem.tcp.failcnt", + .private = RES_FAILCNT, + .trigger = tcp_cgroup_reset, + .read_u64 = tcp_cgroup_read, + }, }; static inline struct tcp_memcontrol *tcp_from_cgproto(struct cg_proto *cg_proto) @@ -197,12 +204,36 @@ static u64 tcp_cgroup_read(struct cgroup *cont, struct cftype *cft) case RES_USAGE: val = tcp_read_usage(memcg); break; + case RES_FAILCNT: + val = tcp_read_stat(memcg, RES_FAILCNT, 0); + break; default: BUG(); } return val; } +static int tcp_cgroup_reset(struct cgroup *cont, unsigned int event) +{ + struct mem_cgroup *memcg; + struct tcp_memcontrol *tcp; + struct cg_proto *cg_proto; + + memcg = mem_cgroup_from_cont(cont); + cg_proto = tcp_prot.proto_cgroup(memcg); + if (!cg_proto) + return 0; + tcp = tcp_from_cgproto(cg_proto); + + switch (event) { + case RES_FAILCNT: + res_counter_reset_failcnt(&tcp->tcp_memory_allocated); + break; + } + + return 0; +} + unsigned long long tcp_max_memory(const struct mem_cgroup *memcg) { struct tcp_memcontrol *tcp; |