linux

mirror of https://github.com/torvalds/linux synced 2024-07-21 02:23:16 +00:00

Go to file

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
arch	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2021-11-26 13:45:19 -08:00
block	block: fix parameter not described warning	2021-11-25 09:32:19 -07:00
certs	certs: Add support for using elliptic curve keys for signing modules	2021-08-23 19:55:42 +03:00
crypto	Update to zstd-1.4.10	2021-11-13 15:32:30 -08:00
Documentation	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2021-11-26 13:45:19 -08:00
drivers	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2021-11-26 13:45:19 -08:00
fs	fuse fixes for 5.16-rc3	2021-11-26 12:01:31 -08:00
include	af_unix: Replace the big lock with small locks.	2021-11-26 18:01:58 -08:00
init	kbuild: Fix -Wimplicit-fallthrough=5 error for GCC 5.x and 6.x	2021-11-14 18:59:49 -08:00
ipc	shm: extend forced shm destroy to support objects from several IPC nses	2021-11-20 10:35:54 -08:00
kernel	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2021-11-26 13:45:19 -08:00
lib	parisc: Increase FRAME_WARN to 2048 bytes on parisc	2021-11-22 07:37:31 +01:00
LICENSES	LICENSES/dual/CC-BY-4.0: Git rid of "smart quotes"	2021-07-15 06:31:24 -06:00
mm	Fixes for 5.16 folios:	2021-11-25 10:13:56 -08:00
net	af_unix: Replace the big lock with small locks.	2021-11-26 18:01:58 -08:00
samples	s390 updates for 5.16-rc2	2021-11-20 10:55:50 -08:00
scripts	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid	2021-11-24 09:44:13 -08:00
security	selinux: fix NULL-pointer dereference when hashtab allocation fails	2021-11-19 16:11:39 -05:00
sound	xen: branch for v5.16-rc3	2021-11-26 09:54:13 -08:00
tools	af_unix: Remove UNIX_ABSTRACT() macro and test sun_path[0] instead.	2021-11-26 18:01:56 -08:00
usr	initramfs: Check timestamp to prevent broken cpio archive	2021-10-24 13:48:40 +09:00
virt	Merge branch 'kvm-5.16-fixes' into kvm-master	2021-11-18 02:11:57 -05:00
.clang-format	clang-format: Update with the latest for_each macro list	2021-05-12 23:32:39 +02:00
.cocciconfig
.get_maintainer.ignore	Opt out of scripts/get_maintainer.pl	2019-05-16 10:53:40 -07:00
.gitattributes	.gitattributes: use 'dts' diff driver for dts files	2019-12-04 19:44:11 -08:00
.gitignore	.gitignore: ignore only top-level modules.builtin	2021-05-02 00:43:35 +09:00
.mailmap	MAINTAINERS: update email address of Christian Borntraeger	2021-11-18 17:50:54 +01:00
COPYING	COPYING: state that all contributions really are covered by this file	2020-02-10 13:32:20 -08:00
CREDITS	MAINTAINERS: Move Daniel Drake to credits	2021-09-21 08:34:58 +03:00
Kbuild	kbuild: rename hostprogs-y/always to hostprogs/always-y	2020-02-04 01:53:07 +09:00
Kconfig	kbuild: ensure full rebuild when the compiler is updated	2020-05-12 13:28:33 +09:00
MAINTAINERS	Networking fixes for 5.16-rc3, including fixes from netfilter.	2021-11-26 12:58:53 -08:00
Makefile	drm fixes for 5.16-rc3	2021-11-25 18:21:20 -08:00
README	Drop all 00-INDEX files from Documentation/	2018-09-09 15:08:58 -06:00

README

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.