Kuniyuki Iwashima afd20b9290 af_unix: Replace the big lock with small locks. ... The hash table of AF_UNIX sockets is protected by the single lock. This patch replaces it with per-hash locks. The effect is noticeable when we handle multiple sockets simultaneously. Here is a test result on an EC2 c5.24xlarge instance. It shows latency (under 10us only) in unix_insert_unbound_socket() while 64 CPUs creating 1024 sockets for each in parallel. Without this patch: nsec : count distribution 0 : 179 | | 500 : 3021 |********* | 1000 : 6271 |******************* | 1500 : 6318 |******************* | 2000 : 5828 |***************** | 2500 : 5124 |*************** | 3000 : 4426 |************* | 3500 : 3672 |*********** | 4000 : 3138 |********* | 4500 : 2811 |******** | 5000 : 2384 |******* | 5500 : 2023 |****** | 6000 : 1954 |***** | 6500 : 1737 |***** | 7000 : 1749 |***** | 7500 : 1520 |**** | 8000 : 1469 |**** | 8500 : 1394 |**** | 9000 : 1232 |*** | 9500 : 1138 |*** | 10000 : 994 |*** | With this patch: nsec : count distribution 0 : 1634 |**** | 500 : 13170 |****************************************| 1000 : 13156 |*************************************** | 1500 : 9010 |*************************** | 2000 : 6363 |******************* | 2500 : 4443 |************* | 3000 : 3240 |********* | 3500 : 2549 |******* | 4000 : 1872 |***** | 4500 : 1504 |**** | 5000 : 1247 |*** | 5500 : 1035 |*** | 6000 : 889 |** | 6500 : 744 |** | 7000 : 634 |* | 7500 : 498 |* | 8000 : 433 |* | 8500 : 355 |* | 9000 : 336 |* | 9500 : 284 | | 10000 : 243 | | Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.co.jp> Signed-off-by: Jakub Kicinski <kuba@kernel.org>		2021-11-26 18:01:58 -08:00
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af_unix.c	af_unix: Replace the big lock with small locks.	2021-11-26 18:01:58 -08:00
diag.c	af_unix: Replace the big lock with small locks.	2021-11-26 18:01:58 -08:00
garbage.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 62	2019-05-24 17:36:46 +02:00
Kconfig	af_unix: Add OOB support	2021-08-04 09:55:52 +01:00
Makefile	af_unix: Implement ->psock_update_sk_prot()	2021-07-15 18:17:50 -07:00
scm.c	io_uring: move io_uring_get_socket() into io_uring.h	2020-09-30 20:32:33 -06:00
scm.h	net: split out functions related to registering inflight socket files	2019-02-28 08:24:23 -07:00
sysctl_net_unix.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152	2019-05-30 11:26:32 -07:00
unix_bpf.c	net: Implement ->sock_is_readable() for UDP and AF_UNIX	2021-10-26 12:29:33 -07:00