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Chun-Tse Shao 122fb9d2df perf lock: Fix parse_lock_type which only retrieve one lock flag [ Upstream commit `1be9264158` ] `parse_lock_type` can only add the first lock flag in `lock_type_table` given input `str`. For example, for `Y rwlock`, it only adds `rwlock:R` into this perf session. Another example is for `-Y mutex`, it only adds the mutex without `LCB_F_SPIN` flag. The patch fixes this issue, makes sure both `rwlock:R` and `rwlock:W` will be added with `-Y rwlock`, and so on. Testing: $ ./perf lock con -ab -Y mutex,rwlock -- perf bench sched pipe # Running 'sched/pipe' benchmark: # Executed 1000000 pipe operations between two processes Total time: 9.313 [sec] 9.313976 usecs/op 107365 ops/sec contended total wait max wait avg wait type caller 176 1.65 ms 19.43 us 9.38 us mutex pipe_read+0x57 34 180.14 us 10.93 us 5.30 us mutex pipe_write+0x50 7 77.48 us 16.09 us 11.07 us mutex do_epoll_wait+0x24d 7 74.70 us 13.50 us 10.67 us mutex do_epoll_wait+0x24d 3 35.97 us 14.44 us 11.99 us rwlock:W ep_done_scan+0x2d 3 35.00 us 12.23 us 11.66 us rwlock:W do_epoll_wait+0x255 2 15.88 us 11.96 us 7.94 us rwlock:W do_epoll_wait+0x47c 1 15.23 us 15.23 us 15.23 us rwlock:W do_epoll_wait+0x4d0 1 14.26 us 14.26 us 14.26 us rwlock:W ep_done_scan+0x2d 2 14.00 us 7.99 us 7.00 us mutex pipe_read+0x282 1 12.29 us 12.29 us 12.29 us rwlock:R ep_poll_callback+0x35 1 12.02 us 12.02 us 12.02 us rwlock:W do_epoll_ctl+0xb65 1 10.25 us 10.25 us 10.25 us rwlock:R ep_poll_callback+0x35 1 7.86 us 7.86 us 7.86 us mutex do_epoll_ctl+0x6c1 1 5.04 us 5.04 us 5.04 us mutex do_epoll_ctl+0x3d4 [namhyung: Add a comment and rename to 'mutex:spin' for consistency Fixes: `d783ea8f62` ("perf lock contention: Simplify parse_lock_type()") Reviewed-by: Namhyung Kim <namhyung@kernel.org> Signed-off-by: Chun-Tse Shao <ctshao@google.com> Cc: nick.forrington@arm.com Link: https://lore.kernel.org/r/20250116235838.2769691-1-ctshao@google.com Signed-off-by: Namhyung Kim <namhyung@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		History 2025-02-08 09:57:35 +01:00
arch	arm64: dts: imx93: Use IMX93_CLK_SPDIF_IPG as SPDIF IPG clock	2025-02-08 09:57:09 +01:00
block	partitions: ldm: remove the initial kernel-doc notation	2025-02-08 09:56:52 +01:00
certs	sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3	2024-09-20 19:52:48 +03:00
crypto	crypto: api - Fix boot-up self-test race	2025-02-08 09:57:28 +01:00
Documentation	crypto: iaa - Fix IAA disabling that occurs when sync_mode is set to 'async'	2025-02-08 09:57:30 +01:00
drivers	iommu/amd: Remove unused amd_iommu_domain_update()	2025-02-08 09:57:34 +01:00
fs	afs: Fix the fallback handling for the YFS.RemoveFile2 RPC call	2025-02-08 09:56:53 +01:00
include	ALSA: hda: Fix compilation of snd_hdac_adsp_xxx() helpers	2025-02-08 09:57:32 +01:00
init	Compiler Attributes: disable __counted_by for clang < 19.1.3	2024-12-05 14:02:45 +01:00
io_uring	io_uring/rsrc: require cloned buffers to share accounting contexts	2025-02-01 18:39:40 +01:00
ipc	ipc: fix memleak if msg_init_ns failed in create_ipc_ns	2024-12-05 14:03:02 +01:00
kernel	bpf: Send signals asynchronously if !preemptible	2025-02-08 09:57:33 +01:00
lib	rhashtable: Fix potential deadlock by moving schedule_work outside lock	2025-02-08 09:57:29 +01:00
LICENSES	LICENSES: add 0BSD license text	2024-09-01 20:43:24 -07:00
mm	cachestat: fix page cache statistics permission checking	2025-02-01 18:39:38 +01:00
net	bpf: tcp: Mark bpf_load_hdr_opt() arg2 as read-write	2025-02-08 09:57:34 +01:00
rust	rust: kbuild: set `bindgen`'s Rust target version	2024-12-19 18:13:22 +01:00
samples	samples/landlock: Fix possible NULL dereference in parse_path()	2025-02-08 09:57:11 +01:00
scripts	scripts/sorttable: fix orc_sort_cmp() to maintain symmetry and transitivity	2025-01-09 13:33:50 +01:00
security	landlock: Handle weird files	2025-02-08 09:57:16 +01:00
sound	ALSA: hda/realtek - Fixed headphone distorted sound on Acer Aspire A115-31 laptop	2025-02-08 09:57:34 +01:00
tools	perf lock: Fix parse_lock_type which only retrieve one lock flag	2025-02-08 09:57:35 +01:00
usr	initramfs: shorten cmd_initfs in usr/Makefile	2024-07-16 01:07:52 +09:00
virt	KVM: x86: switch hugepage recovery thread to vhost_task	2024-12-05 14:02:43 +01:00
.clang-format	clang-format: Update with v6.11-rc1's `for_each` macro list	2024-08-02 13:20:31 +02:00
.cocciconfig	scripts: add Linux .cocciconfig for coccinelle	2016-07-22 12:13:39 +02:00
.editorconfig	.editorconfig: remove trim_trailing_whitespace option	2024-06-13 16:47:52 +02:00
.get_maintainer.ignore	Add Jeff Kirsher to .get_maintainer.ignore	2024-03-08 11:36:54 +00:00
.gitattributes	.gitattributes: set diff driver for Rust source code files	2023-05-31 17:48:25 +02:00
.gitignore	Kbuild updates for v6.12	2024-09-24 13:02:06 -07:00
.mailmap	mailmap: add entry for Thorsten Blum	2024-11-07 14:14:59 -08:00
.rustfmt.toml	rust: add `.rustfmt.toml`	2022-09-28 09:02:20 +02:00
COPYING	COPYING: state that all contributions really are covered by this file	2020-02-10 13:32:20 -08:00
CREDITS	MAINTAINERS: Remove self from DSA entry	2024-11-03 12:52:38 -08:00
Kbuild	Kbuild updates for v6.1	2022-10-10 12:00:45 -07:00
Kconfig	kbuild: ensure full rebuild when the compiler is updated	2020-05-12 13:28:33 +09:00
MAINTAINERS	MAINTAINERS: update location of media main tree	2024-12-05 14:02:42 +01:00
Makefile	Linux 6.12.12	2025-02-01 18:39:40 +01:00
README	README: Fix spelling	2024-03-18 03:36:32 -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 reStructuredText 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.