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authorGlauber Costa <glommer@parallels.com>2012-01-20 04:57:16 +0000
committerDavid S. Miller <davem@davemloft.net>2012-01-22 15:08:46 -0500
commit0e90b31f4ba77027a7c21cbfc66404df0851ca21 (patch)
tree10dc6c443e2f058869d3953a90e6d48fb53f83ae /include/net
parent8cfd14ad1eb52e44cb1fe7b47a68126e45e04026 (diff)
downloadlwn-0e90b31f4ba77027a7c21cbfc66404df0851ca21.tar.gz
lwn-0e90b31f4ba77027a7c21cbfc66404df0851ca21.zip
net: introduce res_counter_charge_nofail() for socket allocations
There is a case in __sk_mem_schedule(), where an allocation is beyond the maximum, but yet we are allowed to proceed. It happens under the following condition: sk->sk_wmem_queued + size >= sk->sk_sndbuf The network code won't revert the allocation in this case, meaning that at some point later it'll try to do it. Since this is never communicated to the underlying res_counter code, there is an inbalance in res_counter uncharge operation. I see two ways of fixing this: 1) storing the information about those allocations somewhere in memcg, and then deducting from that first, before we start draining the res_counter, 2) providing a slightly different allocation function for the res_counter, that matches the original behavior of the network code more closely. I decided to go for #2 here, believing it to be more elegant, since #1 would require us to do basically that, but in a more obscure way. Signed-off-by: Glauber Costa <glommer@parallels.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Michal Hocko <mhocko@suse.cz> CC: Tejun Heo <tj@kernel.org> CC: Li Zefan <lizf@cn.fujitsu.com> CC: Laurent Chavey <chavey@google.com> Acked-by: Tejun Heo <tj@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net')
-rw-r--r--include/net/sock.h10
1 files changed, 4 insertions, 6 deletions
diff --git a/include/net/sock.h b/include/net/sock.h
index 0e7a9b05f92b..4c69ac165e6b 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -1008,9 +1008,8 @@ static inline void memcg_memory_allocated_add(struct cg_proto *prot,
struct res_counter *fail;
int ret;
- ret = res_counter_charge(prot->memory_allocated,
- amt << PAGE_SHIFT, &fail);
-
+ ret = res_counter_charge_nofail(prot->memory_allocated,
+ amt << PAGE_SHIFT, &fail);
if (ret < 0)
*parent_status = OVER_LIMIT;
}
@@ -1054,12 +1053,11 @@ sk_memory_allocated_add(struct sock *sk, int amt, int *parent_status)
}
static inline void
-sk_memory_allocated_sub(struct sock *sk, int amt, int parent_status)
+sk_memory_allocated_sub(struct sock *sk, int amt)
{
struct proto *prot = sk->sk_prot;
- if (mem_cgroup_sockets_enabled && sk->sk_cgrp &&
- parent_status != OVER_LIMIT) /* Otherwise was uncharged already */
+ if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
memcg_memory_allocated_sub(sk->sk_cgrp, amt);
atomic_long_sub(amt, prot->memory_allocated);