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575eec2180
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Yang Jihong 575eec2180 perf sched timehist: Skip print non-idle task samples when only show idle events 
when only show idle events, runtime stats of non-idle tasks is not updated,
and the value is 0, there is no need to print non-idle samples.

Before:

  # perf sched timehist -I
  Samples of sched_switch event do not have callchains.
             time    cpu  task name                       wait time  sch delay   run time
                          [tid/pid]                          (msec)     (msec)     (msec)
  --------------- ------  ------------------------------  ---------  ---------  ---------
   2090450.763235 [0000]  migration/0[15]                     0.000      0.000      0.000
   2090450.763268 [0001]  migration/1[21]                     0.000      0.000      0.000
   2090450.763309 [0002]  migration/2[27]                     0.000      0.000      0.000
   2090450.763343 [0003]  migration/3[33]                     0.000      0.000      0.000
   2090450.763469 [0004]  migration/4[39]                     0.000      0.000      0.000
   2090450.763501 [0005]  migration/5[45]                     0.000      0.000      0.000
   2090450.763622 [0006]  migration/6[51]                     0.000      0.000      0.000
   2090450.763660 [0007]  migration/7[57]                     0.000      0.000      0.000
   2090450.763741 [0009]  migration/9[69]                     0.000      0.000      0.000
   2090450.763862 [0010]  migration/10[75]                    0.000      0.000      0.000
   2090450.763894 [0011]  migration/11[81]                    0.000      0.000      0.000
   2090450.764021 [0012]  migration/12[87]                    0.000      0.000      0.000
   2090450.764056 [0013]  migration/13[93]                    0.000      0.000      0.000
   2090450.764135 [0014]  migration/14[99]                    0.000      0.000      0.000
   2090450.764163 [0015]  migration/15[105]                   0.000      0.000      0.000
   2090450.764292 [0016]  migration/16[111]                   0.000      0.000      0.000
   2090450.764371 [0017]  migration/17[117]                   0.000      0.000      0.000
   2090450.764422 [0018]  migration/18[123]                   0.000      0.000      0.000
   2090450.764490 [0000]  <idle>                              0.000      0.000      1.255
   2090450.764505 [0000]  s1-perf[8235/7168]                  0.000      0.000      0.000
   2090450.764571 [0016]  <idle>                              0.000      0.000      0.278
   2090450.764588 [0010]  <idle>                              0.000      0.000      0.725
   2090450.764590 [0016]  s1-agent[7179/7162]                 0.000      0.000      0.000
   2090450.764635 [0000]  <idle>                              0.015      0.015      0.129
   2090450.764637 [0017]  <idle>                              0.000      0.000      0.266
   2090450.764639 [0000]  s1-perf[8235/7168]                  0.000      0.000      0.000
   2090450.764668 [0017]  s1-agent[7180/7162]                 0.000      0.000      0.000
   2090450.764669 [0000]  <idle>                              0.003      0.003      0.029
   2090450.764672 [0000]  s1-perf[8235/7168]                  0.000      0.000      0.000
   2090450.764683 [0000]  <idle>                              0.003      0.003      0.010

After:

  # perf sched timehist -I
  Samples of sched_switch event do not have callchains.
             time    cpu  task name                       wait time  sch delay   run time
                          [tid/pid]                          (msec)     (msec)     (msec)
  --------------- ------  ------------------------------  ---------  ---------  ---------
   2090450.764490 [0000]  <idle>                              0.000      0.000      1.255
   2090450.764571 [0016]  <idle>                              0.000      0.000      0.278
   2090450.764588 [0010]  <idle>                              0.000      0.000      0.725
   2090450.764635 [0000]  <idle>                              0.015      0.015      0.129
   2090450.764637 [0017]  <idle>                              0.000      0.000      0.266
   2090450.764669 [0000]  <idle>                              0.003      0.003      0.029
   2090450.764683 [0000]  <idle>                              0.003      0.003      0.010
   2090450.764688 [0016]  <idle>                              0.019      0.019      0.097
   2090450.764694 [0000]  <idle>                              0.001      0.001      0.009
   2090450.764706 [0000]  <idle>                              0.001      0.001      0.010
   2090450.764725 [0002]  <idle>                              0.000      0.000      1.415
   2090450.764728 [0000]  <idle>                              0.002      0.002      0.019
   2090450.764823 [0000]  <idle>                              0.003      0.003      0.091
   2090450.764838 [0019]  <idle>                              0.000      0.000      0.154
   2090450.764865 [0002]  <idle>                              0.109      0.109      0.029
   2090450.764866 [0000]  <idle>                              0.012      0.012      0.030
   2090450.764880 [0002]  <idle>                              0.013      0.013      0.001
   2090450.764880 [0000]  <idle>                              0.002      0.002      0.011
   2090450.764896 [0000]  <idle>                              0.001      0.001      0.013
   2090450.764903 [0019]  <idle>                              0.063      0.063      0.002
   2090450.764908 [0019]  <idle>                              0.003      0.003      0.001

Fixes: 07235f84ec ("perf sched timehist: Add -I/--idle-hist option")
Signed-off-by: Yang Jihong <yangjihong@bytedance.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@arm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20240812132606.3126490-1-yangjihong@bytedance.com
Reviewed-and-tested-by: Madadi Vineeth Reddy <vineethr@linux.ibm.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2024-09-03 15:43:03 -03:00
arch RISC-V Fixes for 6.11-rc4 2024-08-16 11:18:09 -07:00
block block: Fix lockdep warning in blk_mq_mark_tag_wait 2024-08-15 19:25:03 -06:00
certs kbuild: use $(src) instead of $(srctree)/$(src) for source directory 2024-05-10 04:34:52 +09:00
crypto crypto: testmgr - generate power-of-2 lengths more often 2024-07-13 11:50:28 +12:00
Documentation Devicetree fixes for v6.11, part 2: 2024-08-16 13:50:33 -07:00
drivers block-6.11-20240824 2024-08-16 14:03:31 -07:00
fs for-6.11-rc3-tag 2024-08-14 17:56:15 -07:00
include io_uring-6.11-20240824 2024-08-16 14:00:05 -07:00
init Rust fixes for v6.11 2024-08-16 11:24:06 -07:00
io_uring io_uring/sqpoll: annotate debug task == current with data_race() 2024-08-13 06:10:59 -06:00
ipc sysctl: treewide: constify the ctl_table argument of proc_handlers 2024-07-24 20:59:29 +02:00
kernel A couple of fixes for tracing: 2024-08-16 11:12:29 -07:00
lib kunit/overflow: Fix UB in overflow_allocation_test 2024-08-15 09:24:55 -07:00
LICENSES LICENSES: Add the copyleft-next-0.3.1 license 2022-11-08 15:44:01 +01:00
mm 9 hotfixes. 5 are cc:stable, 4 either pertain to post-6.10 material or 2024-08-08 07:32:20 -07:00
net Including fixes from wireless and netfilter 2024-08-15 10:35:20 -07:00
rust Rust fixes for v6.11 2024-08-16 11:24:06 -07:00
samples Driver core changes for 6.11-rc1 2024-07-25 10:42:22 -07:00
scripts Rust fixes for v6.11 2024-08-16 11:24:06 -07:00
security KEYS: trusted: dcp: fix leak of blob encryption key 2024-08-15 22:01:14 +03:00
sound ALSA: hda/tas2781: Use correct endian conversion 2024-08-14 16:58:26 +02:00
tools perf sched timehist: Skip print non-idle task samples when only show idle events 2024-09-03 15:43:03 -03:00
usr initramfs: shorten cmd_initfs in usr/Makefile 2024-07-16 01:07:52 +09:00
virt KVM: x86: Disallow read-only memslots for SEV-ES and SEV-SNP (and TDX) 2024-08-14 12:28:24 -04:00
.clang-format Docs: Move clang-format from process/ to dev-tools/ 2024-06-26 16:36:00 -06:00
.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: add script and target to generate pacman package 2024-07-22 01:24:22 +09:00
.mailmap mailmap: update entry for David Heidelberg 2024-08-07 18:33:56 -07:00
.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 tracing: Update of MAINTAINERS and CREDITS file 2024-07-18 14:08:42 -07:00
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 sound fixes for 6.11-rc3 2024-08-09 09:25:30 -07:00
Makefile Rust fixes for v6.11 2024-08-16 11:24:06 -07:00
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.