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Yang Jihong 877c08e04e perf record: Check conflict between '--timestamp-filename' option and pipe mode before recording 
[ Upstream commit 02f9b50e04 ]

In pipe mode, no need to switch perf data output, therefore,
'--timestamp-filename' option should not take effect.
Check the conflict before recording and output WARNING.
In this case, the check pipe mode in perf_data__switch() can be removed.

Before:

  # perf record --timestamp-filename -o- perf test -w noploop | perf report -i- --percent-limit=1
  # To display the perf.data header info, please use --header/--header-only options.
  #
  [ perf record: Woken up 1 times to write data ]
  [ perf record: Dump -.2024011812110182 ]
  #
  # Total Lost Samples: 0
  #
  # Samples: 4K of event 'cycles:P'
  # Event count (approx.): 2176784359
  #
  # Overhead  Command  Shared Object         Symbol
  # ........  .......  ....................  ......................................
  #
      97.83%  perf     perf                  [.] noploop

  #
  # (Tip: Print event counts in CSV format with: perf stat -x,)
  #

After:

  # perf record --timestamp-filename -o- perf test -w noploop | perf report -i- --percent-limit=1
  WARNING: --timestamp-filename option is not available in pipe mode.
  # To display the perf.data header info, please use --header/--header-only options.
  #
  [ perf record: Woken up 1 times to write data ]
  [ perf record: Captured and wrote 0.000 MB - ]
  #
  # Total Lost Samples: 0
  #
  # Samples: 4K of event 'cycles:P'
  # Event count (approx.): 2185575421
  #
  # Overhead  Command  Shared Object          Symbol
  # ........  .......  .....................  .............................................
  #
      97.75%  perf     perf                   [.] noploop

  #
  # (Tip: Profiling branch (mis)predictions with: perf record -b / perf report)
  #

Fixes: ecfd7a9c04 ("perf record: Add '--timestamp-filename' option to append timestamp to output file name")
Signed-off-by: Yang Jihong <yangjihong1@huawei.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20240119040304.3708522-3-yangjihong1@huawei.com
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
 		2024-03-26 18:17:01 -04:00
Documentation soundwire: stream: add missing const to Documentation 2024-03-26 18:17:00 -04:00
LICENSES LICENSES: Add the copyleft-next-0.3.1 license 2022-11-08 15:44:01 +01:00
arch s390/cache: prevent rebuild of shared_cpu_list 2024-03-26 18:16:55 -04:00
block block: fix deadlock between bd_link_disk_holder and partition scan 2024-03-26 18:16:27 -04:00
certs This update includes the following changes: 2023-11-02 16:15:30 -10:00
crypto crypto: lskcipher - Copy IV in lskcipher glue code always 2024-02-24 08:37:24 +08:00
drivers PCI/DPC: Print all TLP Prefixes, not just the first 2024-03-26 18:17:00 -04:00
fs erofs: fix lockdep false positives on initializing erofs_pseudo_mnt 2024-03-26 18:16:56 -04:00
include drm: Don't treat 0 as -1 in drm_fixp2int_ceil 2024-03-26 18:16:59 -04:00
init init/Kconfig: lower GCC version check for -Warray-bounds 2024-03-04 16:40:33 -08:00
io_uring io_uring/net: fix overflow check in io_recvmsg_mshot_prep() 2024-03-26 18:16:29 -04:00
ipc shm: Slim down dependencies 2023-12-20 19:26:31 -05:00
kernel bpf: hardcode BPF_PROG_PACK_SIZE to 2MB * num_possible_nodes() 2024-03-26 18:16:57 -04:00
lib net: blackhole_dev: fix build warning for ethh set but not used 2024-03-26 18:16:38 -04:00
mm 6 hotfixes. 4 are cc:stable and the remainder pertain to post-6.7 2024-03-07 17:16:38 -08:00
net devlink: Fix length of eswitch inline-mode 2024-03-26 18:16:57 -04:00
rust Rust changes for v6.8 2024-01-11 13:05:41 -08:00
samples work around gcc bugs with 'asm goto' with outputs 2024-02-09 15:57:48 -08:00
scripts 6 hotfixes. 4 are cc:stable and the remainder pertain to post-6.7 2024-03-07 17:16:38 -08:00
security integrity-v6.8-fix 2024-03-05 13:21:30 -08:00
sound ASoC: SOF: amd: Compute file paths on firmware load 2024-03-26 18:17:00 -04:00
tools perf record: Check conflict between '--timestamp-filename' option and pipe mode before recording 2024-03-26 18:17:01 -04:00
usr Kbuild updates for v6.8 2024-01-18 17:57:07 -08:00
virt KVM: Make KVM_MEM_GUEST_MEMFD mutually exclusive with KVM_MEM_READONLY 2024-02-22 17:07:06 -08:00
.clang-format clang-format: Update with v6.7-rc4's `for_each` macro list 2023-12-08 23:54:38 +01:00
.cocciconfig
…
.editorconfig Add .editorconfig file for basic formatting 2023-12-28 16:22:47 +09:00
.get_maintainer.ignore get_maintainer: add Alan to .get_maintainer.ignore 2022-08-20 15:17:44 -07:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore Add .editorconfig file for basic formatting 2023-12-28 16:22:47 +09:00
.mailmap drm fixes for 6.8 final 2024-03-08 12:44:56 -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: supplement of zswap maintainers update 2024-01-25 23:52:21 -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 drm fixes for 6.8 final 2024-03-08 12:44:56 -08:00
Makefile Linux 6.8.1 2024-03-15 14:19:29 -04:00
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.