kernel-fxtec-pro1x/net/ipv4
Glauber Costa 3f13461939 memcg: decrement static keys at real destroy time
We call the destroy function when a cgroup starts to be removed, such as
by a rmdir event.

However, because of our reference counters, some objects are still
inflight.  Right now, we are decrementing the static_keys at destroy()
time, meaning that if we get rid of the last static_key reference, some
objects will still have charges, but the code to properly uncharge them
won't be run.

This becomes a problem specially if it is ever enabled again, because now
new charges will be added to the staled charges making keeping it pretty
much impossible.

We just need to be careful with the static branch activation: since there
is no particular preferred order of their activation, we need to make sure
that we only start using it after all call sites are active.  This is
achieved by having a per-memcg flag that is only updated after
static_key_slow_inc() returns.  At this time, we are sure all sites are
active.

This is made per-memcg, not global, for a reason: it also has the effect
of making socket accounting more consistent.  The first memcg to be
limited will trigger static_key() activation, therefore, accounting.  But
all the others will then be accounted no matter what.  After this patch,
only limited memcgs will have its sockets accounted.

[akpm@linux-foundation.org: move enum sock_flag_bits into sock.h,
                            document enum sock_flag_bits,
                            convert memcg_proto_active() and memcg_proto_activated() to test_bit(),
                            redo tcp_update_limit() comment to 80 cols]
Signed-off-by: Glauber Costa <glommer@parallels.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Li Zefan <lizefan@huawei.com>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.cz>
Acked-by: David Miller <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-05-29 16:22:28 -07:00
..
netfilter net: Convert net_ratelimit uses to net_<level>_ratelimited 2012-05-15 13:45:03 -04:00
af_inet.c sock: Introduce named constants for sk_reuse 2012-04-21 15:52:25 -04:00
ah4.c net: ipv4 and ipv6: Convert printk(KERN_DEBUG to pr_debug 2012-05-16 01:01:03 -04:00
arp.c Merge branch 'delete-tokenring' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux 2012-05-16 01:02:40 -04:00
cipso_ipv4.c ipv4: Convert call_rcu() to kfree_rcu(), drop opt_kfree_rcu() 2012-02-21 09:03:31 -08:00
datagram.c ipv4: Lock socket and use cork flow in ip4_datagram_connect(). 2011-05-08 13:48:57 -07:00
devinet.c net: ipv4 and ipv6: Convert printk(KERN_DEBUG to pr_debug 2012-05-16 01:01:03 -04:00
esp4.c net: ipv4: Standardize prefixes for message logging 2012-03-12 17:05:21 -07:00
fib_frontend.c net: cleanup unsigned to unsigned int 2012-04-15 12:44:40 -04:00
fib_lookup.h
fib_rules.c ipv4: Stop using NLA_PUT*(). 2012-04-02 04:33:43 -04:00
fib_semantics.c ipv4: fix the rcu race between free_fib_info and ip_route_output_slow 2012-05-24 00:28:21 -04:00
fib_trie.c ipv4: Do not use dead fib_info entries. 2012-05-10 22:16:32 -04:00
gre.c net: ipv4: Standardize prefixes for message logging 2012-03-12 17:05:21 -07:00
icmp.c net: Convert net_ratelimit uses to net_<level>_ratelimited 2012-05-15 13:45:03 -04:00
igmp.c ipv4: fix checkpatch errors 2012-04-15 12:37:19 -04:00
inet_connection_sock.c sock: Introduce named constants for sk_reuse 2012-04-21 15:52:25 -04:00
inet_diag.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2012-05-07 23:35:40 -04:00
inet_fragment.c
inet_hashtables.c ipv4: fix checkpatch errors 2012-04-15 12:37:19 -04:00
inet_lro.c net: add skb frag size accessors 2011-10-19 03:10:46 -04:00
inet_timewait_sock.c net: ipv4 and ipv6: Convert printk(KERN_DEBUG to pr_debug 2012-05-16 01:01:03 -04:00
inetpeer.c route: Remove redirect_genid 2012-03-08 00:30:32 -08:00
ip_forward.c ipv4: fix checkpatch errors 2012-04-15 12:37:19 -04:00
ip_fragment.c ipv4: use skb coalescing in defragmentation 2012-05-19 18:34:57 -04:00
ip_gre.c ipv4: fix checkpatch errors 2012-04-15 12:37:19 -04:00
ip_input.c net: Convert net_ratelimit uses to net_<level>_ratelimited 2012-05-15 13:45:03 -04:00
ip_options.c net: Convert net_ratelimit uses to net_<level>_ratelimited 2012-05-15 13:45:03 -04:00
ip_output.c net: Convert net_ratelimit uses to net_<level>_ratelimited 2012-05-15 13:45:03 -04:00
ip_sockglue.c net: IP_MULTICAST_IF setsockopt now recognizes struct mreq 2012-05-07 23:03:22 -04:00
ipcomp.c net: Convert printks to pr_<level> 2012-03-11 23:42:51 -07:00
ipconfig.c net/ipv4/ipconfig: neaten __setup placement 2012-05-20 04:06:16 -04:00
ipip.c ipv4: fix checkpatch errors 2012-04-15 12:37:19 -04:00
ipmr.c net: Convert net_ratelimit uses to net_<level>_ratelimited 2012-05-15 13:45:03 -04:00
Kconfig net: delete all instances of special processing for token ring 2012-05-15 20:14:35 -04:00
Makefile tcp memory pressure controls 2011-12-12 19:04:10 -05:00
netfilter.c net: Delete all remaining instances of ctl_path 2012-04-20 21:22:30 -04:00
ping.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace 2012-05-23 17:42:39 -07:00
proc.c tcp: reduce out_of_order memory use 2012-03-19 16:53:08 -04:00
protocol.c
raw.c ipv4: fix checkpatch errors 2012-04-15 12:37:19 -04:00
route.c mm: add a low limit to alloc_large_system_hash 2012-05-24 00:28:21 -04:00
syncookies.c tcp: fix syncookie regression 2012-03-11 15:52:12 -07:00
sysctl_net_ipv4.c tcp: early retransmit 2012-05-02 20:56:10 -04:00
tcp.c mm: add a low limit to alloc_large_system_hash 2012-05-24 00:28:21 -04:00
tcp_bic.c tcp: fix undo after RTO for BIC 2012-01-20 14:17:26 -05:00
tcp_cong.c tcp: bool conversions 2012-05-17 14:59:59 -04:00
tcp_cubic.c tcp: fix undo after RTO for CUBIC 2012-01-20 14:17:26 -05:00
tcp_diag.c inet_diag: Rename inet_diag_req into inet_diag_req_v2 2012-01-11 12:56:06 -08:00
tcp_highspeed.c
tcp_htcp.c
tcp_hybla.c tcp: bool conversions 2012-05-17 14:59:59 -04:00
tcp_illinois.c
tcp_input.c tcp: take care of overlaps in tcp_try_coalesce() 2012-05-24 00:28:21 -04:00
tcp_ipv4.c tcp: bool conversions 2012-05-17 14:59:59 -04:00
tcp_lp.c
tcp_memcontrol.c memcg: decrement static keys at real destroy time 2012-05-29 16:22:28 -07:00
tcp_minisocks.c tcp: bool conversions 2012-05-17 14:59:59 -04:00
tcp_output.c tcp: bool conversions 2012-05-17 14:59:59 -04:00
tcp_probe.c net: cleanup unsigned to unsigned int 2012-04-15 12:44:40 -04:00
tcp_scalable.c
tcp_timer.c tcp: early retransmit: delayed fast retransmit 2012-05-02 20:56:10 -04:00
tcp_vegas.c
tcp_vegas.h
tcp_veno.c
tcp_westwood.c
tcp_yeah.c
tunnel4.c net: Convert printks to pr_<level> 2012-03-11 23:42:51 -07:00
udp.c mm: add a low limit to alloc_large_system_hash 2012-05-24 00:28:21 -04:00
udp_diag.c udp_diag: implement idiag_get_info for udp/udplite to get queue information 2012-04-25 20:43:01 -04:00
udp_impl.h ipv4: fix checkpatch errors 2012-04-15 12:37:19 -04:00
udplite.c net: ipv4: Standardize prefixes for message logging 2012-03-12 17:05:21 -07:00
xfrm4_input.c
xfrm4_mode_beet.c ipsec: be careful of non existing mac headers 2012-02-23 16:50:45 -05:00
xfrm4_mode_transport.c
xfrm4_mode_tunnel.c ipsec: be careful of non existing mac headers 2012-02-23 16:50:45 -05:00
xfrm4_output.c xfrm4: Don't call icmp_send on local error 2011-07-01 17:33:19 -07:00
xfrm4_policy.c net: Convert all sysctl registrations to register_net_sysctl 2012-04-20 21:22:30 -04:00
xfrm4_state.c net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00
xfrm4_tunnel.c net: ipv4: Standardize prefixes for message logging 2012-03-12 17:05:21 -07:00