linux/net/sctp
Eric Dumazet 4890b686f4 net: keep sk->sk_forward_alloc as small as possible
Currently, tcp_memory_allocated can hit tcp_mem[] limits quite fast.

Each TCP socket can forward allocate up to 2 MB of memory, even after
flow became less active.

10,000 sockets can have reserved 20 GB of memory,
and we have no shrinker in place to reclaim that.

Instead of trying to reclaim the extra allocations in some places,
just keep sk->sk_forward_alloc values as small as possible.

This should not impact performance too much now we have per-cpu
reserves: Changes to tcp_memory_allocated should not be too frequent.

For sockets not using SO_RESERVE_MEM:
 - idle sockets (no packets in tx/rx queues) have zero forward alloc.
 - non idle sockets have a forward alloc smaller than one page.

Note:

 - Removal of SK_RECLAIM_CHUNK and SK_RECLAIM_THRESHOLD
   is left to MPTCP maintainers as a follow up.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Shakeel Butt <shakeelb@google.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2022-06-10 16:21:27 -07:00
..
associola.c sctp: enable PLPMTUD when the transport is ready 2021-06-22 11:28:52 -07:00
auth.c sctp: move the active_key update after sh_keys is added 2021-08-03 11:43:43 +01:00
bind_addr.c sctp: validate from_addr_param return 2021-06-28 15:34:50 -07:00
chunk.c net: sctp: chunk.c: delete duplicated word 2020-08-24 16:21:43 -07:00
debug.c sctp: add the probe timer in transport for PLPMTUD 2021-06-22 11:28:52 -07:00
diag.c sctp: fix kernel-infoleak for SCTP sockets 2022-03-10 14:46:42 -08:00
endpointola.c sctp: use call_rcu to free endpoint 2021-12-25 17:13:37 +00:00
input.c sctp: read sk->sk_bound_dev_if once in sctp_rcv() 2022-05-16 10:31:06 +01:00
inqueue.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 104 2019-05-24 17:39:00 +02:00
ipv6.c ipv6: Remove __ipv6_only_sock(). 2022-04-22 12:47:50 +01:00
Kconfig sctp: create udp4 sock and add its encap_rcv 2020-10-30 15:23:52 -07:00
Makefile sctp: rename sctp_diag.c as diag.c 2018-02-13 13:56:31 -05:00
objcnt.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 104 2019-05-24 17:39:00 +02:00
offload.c sctp: remove the NETIF_F_SG flag before calling skb_segment 2021-01-16 19:05:59 -08:00
output.c net: allow gso_max_size to exceed 65536 2022-05-16 10:18:55 +01:00
outqueue.c sctp: count singleton chunks in assoc user stats 2022-04-05 09:51:12 +02:00
primitive.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 104 2019-05-24 17:39:00 +02:00
proc.c sctp: move hlist_node and hashent out of sctp_ep_common 2021-12-23 11:15:30 +00:00
protocol.c net: remove SK_MEM_QUANTUM and SK_MEM_QUANTUM_SHIFT 2022-06-10 16:21:26 -07:00
sm_make_chunk.c sctp: account stream padding length for reconf chunk 2021-10-14 07:15:22 -07:00
sm_sideeffect.c sctp: check asoc strreset_chunk in sctp_generate_reconf_event 2022-04-23 22:34:17 +01:00
sm_statefuns.c net: keep sk->sk_forward_alloc as small as possible 2022-06-10 16:21:27 -07:00
sm_statetable.c sctp: add the probe timer in transport for PLPMTUD 2021-06-22 11:28:52 -07:00
socket.c net: keep sk->sk_forward_alloc as small as possible 2022-06-10 16:21:27 -07:00
stream_interleave.c net: keep sk->sk_forward_alloc as small as possible 2022-06-10 16:21:27 -07:00
stream_sched_prio.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 104 2019-05-24 17:39:00 +02:00
stream_sched_rr.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 104 2019-05-24 17:39:00 +02:00
stream_sched.c stcp: Use memset_after() to zero sctp_stream_out_ext 2022-05-20 17:42:53 -07:00
stream.c net: sctp: Fix negotiation of the number of data streams. 2020-08-20 16:37:37 -07:00
sysctl.c sctp: add probe_interval in sysctl and sock/asoc/transport 2021-06-22 11:28:51 -07:00
transport.c sctp: make the raise timer more simple and accurate 2021-11-25 21:00:45 -08:00
tsnmap.c net: sctp: trivial: fix typo in comment 2021-03-04 13:48:32 -08:00
ulpevent.c net: remove noblock parameter from recvmsg() entities 2022-04-12 15:00:25 +02:00
ulpqueue.c net: keep sk->sk_forward_alloc as small as possible 2022-06-10 16:21:27 -07:00