Changes in Build

9f116f4b811b5846808e27507a3aa2824819edeb - perf tests: Add test for uncore event sorting

Mon, 18 May 2026 08:29:03 +0200

perf tests: Add test for uncore event sortingAdd a test for uncore event sorting matching multiple PMUs.Uncore PMUs may have a common prefix, like the PMUsuncore_imc_free_running_0 and uncore_imc_free_running_1 have a prefix ofuncore_imc_free_running.Parsing an event group like "{data_read,data_write}" for those PMUsshould result with two groups: "{uncore_imc_free_running_0/data_read/,uncore_imc_free_running_0/data_write/}, {uncore_imc_free_running_1/data_read/,uncore_imc_free_running_1/data_write/}"which means the evsels need resorting as when initially parsed theevsels are ordered with mixed PMUs: "{uncore_imc_free_running_0/data_read/,uncore_imc_free_running_1/data_read/, uncore_imc_free_running_0/data_write/,uncore_imc_free_running_1/data_write/}".Signed-off-by: Ian Rogers Tested-by: Zide Chen Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Collin Funk Cc: Dmitrii Dolgov <9erthalion6@gmail.com>Cc: German Gomez Cc: Ingo Molnar Cc: James Clark Cc: Jiri Olsa Cc: Namhyung Kim Cc: Peter Zijlstra Signed-off-by: Arnaldo Carvalho de Melo List of files: /linux/tools/perf/tests/Build

34e271ae55382fbdb04f3e13e856457d8e0dee45 - perf test: Add kallsyms split test

Wed, 03 Dec 2025 00:57:18 +0100

perf test: Add kallsyms split testCreate a fake root directory for /proc/{version,modules,kallsyms} in/tmp for testing. The kallsyms has a bad symbol in the module and itcauses the main map splitted. The test ensures it only has two maps -kernel and the module and it finds the initial map after the modulewithout creating the split maps like [kernel].0 and so on. $ perf test -vv "split kallsyms" 69: split kallsyms: --- start --- test child forked, pid 1016196 try to create fake root directory create kernel maps from the fake root directory maps__set_modules_path_dir: cannot open /tmp/perf-test.Zrv6Sy/lib/modules/X.Y.Z dir Problems setting modules path maps, continuing anyway... Failed to open /tmp/perf-test.Zrv6Sy/proc/kcore. Note /proc/kcore requires CAP_SYS_RAWIO capability to access. Using /tmp/perf-test.Zrv6Sy/proc/kallsyms for symbols kernel map loaded - check symbol and map ---- end(0) ---- 69: split kallsyms : OkReviewed-by: Ian Rogers Signed-off-by: Namhyung Kim List of files: /linux/tools/perf/tests/Build

d18020cf1e92c9f77819c49b61e2d558ed9fad70 - perf test: Remove C python_use test

Wed, 03 Sep 2025 20:42:48 +0200

perf test: Remove C python_use testRemoved in favor of the shell script version.Signed-off-by: Ian Rogers Tested-by: Arnaldo Carvalho de Melo Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Collin Funk Cc: Ingo Molnar Cc: James Clark Cc: Jiri Olsa Cc: Kan Liang Cc: Mark Rutland Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Ravi Bangoria Signed-off-by: Arnaldo Carvalho de Melo List of files: /linux/tools/perf/tests/Build

34c4ff1cbf7e7b600496c5adb72131ec5510e459 - perf test: Add libsubcmd help tests

Tue, 01 Jul 2025 22:10:26 +0200

perf test: Add libsubcmd help testsAdd a set of tests for subcmd routines. Currently it fails the last onesince there's a bug. It'll be fixed by the next commit. $ perf test subcmd 69: libsubcmd help tests : 69.1: Load subcmd names : Ok 69.2: Uniquify subcmd names : Ok 69.3: Exclude duplicate subcmd names : FAILED!Reviewed-by: Ian Rogers Link: https://lore.kernel.org/r/20250701201027.1171561-2-namhyung@kernel.orgSigned-off-by: Namhyung Kim List of files: /linux/tools/perf/tests/Build

114339ee4d66a328d186264ffa23a766542a9a15 - perf build: Specify shellcheck should use bash

Sat, 28 Jun 2025 05:41:25 +0200

perf build: Specify shellcheck should use bashWhen someone has a global shellcheckrc file, for example at~/.config/shellcheckrc, with the directive 'shell=sh', building perfwill fail with many shellcheck errors like: In tests/shell/base_probe/test_adding_kernel.sh line 294: (( TEST_RESULT += $? )) ^---------------------^ SC3006 (warning): In POSIX sh, standalone ((..)) is undefined. For more information: https://www.shellcheck.net/wiki/SC3006 -- In POSIX sh, standalone ((..)) is... make[5]: *** [tests/Build:91: tests/shell/base_probe/test_adding_kernel.sh.shellcheck_log] Error 1Passing the '-s bash' option ensures that it runs correctly regardlessof a developers global configuration.This patch adds '-s bash' and other options to the SHELLCHECK variablein Makefile.perf and makes use of the variable consistently.Signed-off-by: Collin Funk Link: https://lore.kernel.org/r/63491dbc8439edf2e949d80e264b9d22332fea61.1751082075.git.collin.funk1@gmail.comSigned-off-by: Namhyung Kim List of files: /linux/tools/perf/tests/Build

bdf05ccd1841427445e7a7d117b47f1737e879bc - perf test demangle-rust: Add Rust demangling test

Wed, 30 Apr 2025 02:41:26 +0200

perf test demangle-rust: Add Rust demangling testThe test cases are listed examples in:https://doc.rust-lang.org/rustc/symbol-mangling/v0.htmlThis test was previously part of a different Rust v0 demangler:https://lore.kernel.org/lkml/20250129193037.573431-1-irogers@google.com/Signed-off-by: Ian Rogers Cc: Adrian Hunter Cc: Alex Gaynor Cc: Alexander Shishkin Cc: Alice Ryhl Cc: Andreas Hindborg Cc: Ariel Ben-Yehuda Cc: Benno Lossin Cc: Bill Wendling Cc: Björn Roy Baron Cc: Boqun Feng Cc: Daniel Xu Cc: Danilo Krummrich Cc: Gary Guo Cc: Howard Chu Cc: Ingo Molnar Cc: James Clark Cc: Jiapeng Chong Cc: Jiri Olsa Cc: Justin Stitt Cc: Kan Liang Cc: Mark Rutland Cc: Masami Hiramatsu Cc: Miguel Ojeda Cc: Namhyung Kim Cc: Nathan Chancellor Cc: Nick Desaulniers Cc: Peter Zijlstra Cc: Ravi Bangoria Cc: Stephen Brennan Cc: Trevor Gross Link: https://lore.kernel.org/r/20250430004128.474388-5-irogers@google.comSigned-off-by: Arnaldo Carvalho de Melo List of files: /linux/tools/perf/tests/Build

8a54784e708b51c1dcead1471bbee5fb31ae92cc - perf build: Add pylint build tests

Tue, 11 Mar 2025 22:36:26 +0100

perf build: Add pylint build testsIf PYLINT=1 is passed to the build then run pylint over python code inperf. Unlike shellcheck this isn't default on as there are currentlytoo many errors.An example of an error:```************* Module setuputil/setup.py:19:0: C0301: Line too long (127/100) (line-too-long)util/setup.py:20:0: C0301: Line too long (138/100) (line-too-long)util/setup.py:63:0: C0301: Line too long (106/100) (line-too-long)util/setup.py:1:0: C0114: Missing module docstring (missing-module-docstring)util/setup.py:24:4: W0622: Redefining built-in 'vars' (redefined-builtin)util/setup.py:11:4: C0103: Constant name "cc_options" doesn't conform to UPPER_CASE naming style (invalid-name)util/setup.py:13:4: C0103: Constant name "cc_options" doesn't conform to UPPER_CASE naming style (invalid-name)util/setup.py:15:34: R1732: Consider using 'with' for resource-allocating operations (consider-using-with)util/setup.py:18:0: C0116: Missing function or method docstring (missing-function-docstring)util/setup.py:19:16: R1732: Consider using 'with' for resource-allocating operations (consider-using-with)util/setup.py:44:0: C0413: Import "from setuptools import setup, Extension" should be placed at the top of the module (wrong-import-position)util/setup.py:46:0: C0413: Import "from setuptools.command.build_ext import build_ext as _build_ext" should be placed at the top of the module (wrong-import-position)util/setup.py:47:0: C0413: Import "from setuptools.command.install_lib import install_lib as _install_lib" should be placed at the top of the module (wrong-import-position)util/setup.py:49:0: C0115: Missing class docstring (missing-class-docstring)util/setup.py:49:0: C0103: Class name "build_ext" doesn't conform to PascalCase naming style (invalid-name)util/setup.py:52:8: W0201: Attribute 'build_lib' defined outside __init__ (attribute-defined-outside-init)util/setup.py:53:8: W0201: Attribute 'build_temp' defined outside __init__ (attribute-defined-outside-init)util/setup.py:55:0: C0115: Missing class docstring (missing-class-docstring)util/setup.py:55:0: C0103: Class name "install_lib" doesn't conform to PascalCase naming style (invalid-name)util/setup.py:58:8: W0201: Attribute 'build_dir' defined outside __init__ (attribute-defined-outside-init)*-----------------------------------------------------------------Your code has been rated at 6.67/10 (previous run: 6.51/10, +0.16)make[4]: *** [util/Build:442: util/setup.py.pylint_log] Error 1```Reviewed-by: James Clark Signed-off-by: Ian Rogers Link: https://lore.kernel.org/r/20250311213628.569562-5-irogers@google.comSigned-off-by: Namhyung Kim List of files: /linux/tools/perf/tests/Build

168910d0f9377b23b98404c88c13d4c51cdc5f15 - perf build: Add mypy build tests

Tue, 11 Mar 2025 22:36:25 +0100

perf build: Add mypy build testsIf MYPY=1 is passed to the build then run mypy over python code inperf. Unlike shellcheck this isn't default on as there are currentlytoo many errors.An example of an error:```util/setup.py:8: error: Item "None" of "str | None" has no attribute "split" [union-attr]util/setup.py:15: error: Item "None" of "IO[bytes] | None" has no attribute "readline" [union-attr]util/setup.py:15: error: List item 0 has incompatible type "str | None"; expected "str | bytes | PathLike[str] | PathLike[bytes]" [list-item]util/setup.py:16: error: Unsupported left operand type for + ("None") [operator]util/setup.py:16: note: Left operand is of type "str | None"util/setup.py:74: error: Unsupported left operand type for + ("None") [operator]util/setup.py:74: note: Left operand is of type "str | None"Found 5 errors in 1 file (checked 1 source file)make[4]: *** [util/Build:430: util/setup.py.mypy_log] Error 1```Reviewed-by: James Clark Signed-off-by: Ian Rogers Link: https://lore.kernel.org/r/20250311213628.569562-4-irogers@google.comSigned-off-by: Namhyung Kim List of files: /linux/tools/perf/tests/Build

ef238109a3d20a2af474bf758c50072a09591f19 - perf build: Rename TEST_LOGS to SHELL_TEST_LOGS

Tue, 11 Mar 2025 22:36:24 +0100

perf build: Rename TEST_LOGS to SHELL_TEST_LOGSRename TEST_LOGS to SHELL_TEST_LOGS as later changes will add morekinds of test logs.Minor comment tweak in Makefile.perf as more than just test shelltests are checked.Reviewed-by: James Clark Signed-off-by: Ian Rogers Link: https://lore.kernel.org/r/20250311213628.569562-3-irogers@google.comSigned-off-by: Namhyung Kim List of files: /linux/tools/perf/tests/Build

5e530a8287b7c935eeb56d65c11d0f823b3dc0a7 - perf tests: Enable tests disabled due to tracepoint parsing

Mon, 18 Nov 2024 23:53:45 +0100

perf tests: Enable tests disabled due to tracepoint parsingTracepoint parsing required libtraceevent but no longer does. Removethe Build logic and #ifdefs that caused the tests not to be run. Testcode that directly uses libtraceevent is still guarded.Reviewed-by: Namhyung Kim Signed-off-by: Ian Rogers Tested-by: Arnaldo Carvalho de Melo Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Andi Kleen Cc: Athira Rajeev Cc: Ben Gainey Cc: Colin Ian King Cc: Dominique Martinet Cc: Ilkka Koskinen Cc: Ingo Molnar Cc: James Clark Cc: Jiri Olsa Cc: Kan Liang Cc: Mark Rutland Cc: Oliver Upton Cc: Paran Lee Cc: Peter Zijlstra Cc: Steinar H. Gunderson Cc: Steven Rostedt (VMware) Cc: Thomas Falcon Cc: Weilin Wang Cc: Yang Jihong Cc: Yang Li Cc: Ze Gao Cc: Zixian Cai Cc: zhaimingbing Link: https://lore.kernel.org/r/20241118225345.889810-8-irogers@google.comSigned-off-by: Arnaldo Carvalho de Melo List of files: /linux/tools/perf/tests/Build

8c329057def8e3409a82839b1a730935b77feeab - perf test: Add hwmon filename parser test

Sat, 09 Nov 2024 01:37:55 +0100

perf test: Add hwmon filename parser testFilename parsing maps a hwmon filename to constituent parts enum/intparts for the hwmon config value. Add a test case for the parsing.Signed-off-by: Ian Rogers Cc: Ravi Bangoria Cc: Yoshihiro Furudera Cc: Howard Chu Cc: Ze Gao Cc: Changbin Du Cc: Junhao He Cc: Weilin Wang Cc: James Clark Cc: Oliver Upton Cc: Athira Jajeev [namhyung: add #include for strlcpy()]Link: https://lore.kernel.org/r/20241109003759.473460-4-irogers@google.comSigned-off-by: Namhyung Kim List of files: /linux/tools/perf/tests/Build

a52143aa2127aa92b11b3936b606de81d1ef6ef3 - perf test: Remove dangling CFLAGS for removed attr.o object

Mon, 04 Nov 2024 15:34:58 +0100

perf test: Remove dangling CFLAGS for removed attr.o objectSince the C test wrapper for attr.py was removed we don't have an attr.oobject for that CFLAGS_attr.o to apply for, remove it.Fixes: 3a447031f5fc21c4 ("perf test: Remove C test wrapper for attr.py")Signed-off-by: Arnaldo Carvalho de Melo Reviewed-by: Ian Rogers Cc: Athira Rajeev Cc: Howard Chu Cc: James Clark Cc: Leo Yan Cc: Stephen Rothwell Cc: Thomas Richter Cc: Veronika Molnarova Cc: Weilin Wang Cc: Ze Gao Cc: zhaimingbing Link: https://lore.kernel.org/r/ZyjbksKYnV22zmz-@x1Signed-off-by: Namhyung Kim List of files: /linux/tools/perf/tests/Build

3a447031f5fc21c4e112a5ca52d091d1ef33aeb6 - perf test: Remove C test wrapper for attr.py

Tue, 15 Oct 2024 02:01:57 +0200

perf test: Remove C test wrapper for attr.pyRemove the C wrapper now a shell script wrapper exists. Moveperf_event_attr dumping functions to evsel.c and reduce the scope ofvariables/defines. Use fprintf to avoid snprintf complexities inWRITE_ASS.Add __SANE_USERSPACE_TYPES__ to evsel.c to fix format flag issues onPowerPC triggered by moving attr.c functions to evsel.c.Signed-off-by: Ian Rogers Tested-by: Athira Rajeev Cc: Stephen Rothwell Cc: zhaimingbing Cc: Howard Chu Cc: Ze Gao Cc: Weilin Wang Cc: James Clark Cc: Leo Yan Cc: Thomas Richter Cc: Veronika Molnarova Link: https://lore.kernel.org/r/20241015000158.871828-3-irogers@google.comSigned-off-by: Namhyung Kim List of files: /linux/tools/perf/tests/Build

8c25df7af322040fdf5041e912af7cc810b0f86d - perf tests: Add tool PMU test

Wed, 02 Oct 2024 05:20:13 +0200

perf tests: Add tool PMU testEnsure parsing with and without PMU creates events with the expectedconfig values. This ensures the tool.json doesn't get out of sync withtool_pmu_event enum.Signed-off-by: Ian Rogers Acked-by: Namhyung Kim Link: https://lore.kernel.org/r/20241002032016.333748-11-irogers@google.comSigned-off-by: Namhyung Kim List of files: /linux/tools/perf/tests/Build

1dad99af1a8211e2afc1b711c0cda4fbdd445ae2 - perf test: Make tests its own library

Tue, 25 Jun 2024 23:41:13 +0200

perf test: Make tests its own libraryMake the tests code its own library. This is done to avoid compilingcode twice, once for the perf tool and once for the perf pythonmodule.Signed-off-by: Ian Rogers Reviewed-by: James Clark Cc: Suzuki K Poulose Cc: Kees Cook Cc: Palmer Dabbelt Cc: Albert Ou Cc: Nick Terrell Cc: Gary Guo Cc: Alex Gaynor Cc: Boqun Feng Cc: Wedson Almeida Filho Cc: Ze Gao Cc: Alice Ryhl Cc: Andrei Vagin Cc: Yicong Yang Cc: Jonathan Cameron Cc: Guo Ren Cc: Miguel Ojeda Cc: Will Deacon Cc: Mike Leach Cc: Leo Yan Cc: Oliver Upton Cc: John Garry Cc: Benno Lossin Cc: Björn Roy Baron Cc: Andreas Hindborg Cc: Paul Walmsley Signed-off-by: Namhyung Kim Link: https://lore.kernel.org/r/20240625214117.953777-5-irogers@google.com List of files: /linux/tools/perf/tests/Build

d5bcade989a86caa4314aa91d6d3f652e8a82fe5 - perf test: Rename builtin-test-list and add missed header guard

Wed, 21 Feb 2024 04:41:52 +0100

perf test: Rename builtin-test-list and add missed header guardbuiltin-test-list is primarily concerned with shell scripttests. Rename the file to better reflect this and add a missed headerguard.Signed-off-by: Ian Rogers Cc: James Clark Cc: Justin Stitt Cc: Bill Wendling Cc: Nick Desaulniers Cc: Yang Jihong Cc: Nathan Chancellor Cc: Kan Liang Cc: Athira Jajeev Cc: llvm@lists.linux.devSigned-off-by: Namhyung Kim Link: https://lore.kernel.org/r/20240221034155.1500118-6-irogers@google.com List of files: /linux/tools/perf/tests/Build

b809fc656e763296f227b9b31e8f225e5977a8af - perf build: Shellcheck support for OUTPUT directory

Wed, 29 Nov 2023 22:34:25 +0100

perf build: Shellcheck support for OUTPUT directoryMigrate Makefile.tests to Build so that variables like rule_mkdir aredefined via Makefile.build (needed so the output directory can becreated). This requires SHELLCHECK being exported and the clean ruletweaking to remove the files in find.Change find "-perm -o=x" as it was failing on my Debian based Linuxkernel tree, switch to using "-executable".Adding a filename prefix of "." to the shellcheck log files is a painand error prone in make, remove this prefix and just add theshellcheck log files to .gitignore.Fix the command echo so that running the test is displayed.Fixes: 1638b11ef8156c85 ("perf tools: Add perf binary dependent rule for shellcheck log in Makefile.perf")Reviewed-by: Athira Jajeev Signed-off-by: Ian Rogers Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Ingo Molnar Cc: James Clark Cc: Jiri Olsa Cc: Kan Liang Cc: Mark Rutland Cc: Namhyung Kim Cc: Peter Zijlstra Link: https://lore.kernel.org/r/20231129213428.2227448-1-irogers@google.comSigned-off-by: Arnaldo Carvalho de Melo List of files: /linux/tools/perf/tests/Build

8a55c1e2c9e123b399b272a7db23f09dbb74af21 - perf util: Add a function for replacing characters in a string

Mon, 04 Sep 2023 11:50:45 +0200

perf util: Add a function for replacing characters in a stringIt finds all occurrences of a single character and replaces them witha multi character string. This will be used in a test in a followingcommit.Reviewed-by: Ian Rogers Signed-off-by: James Clark Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Chen Zhongjin Cc: Eduard Zingerman Cc: Haixin Yu Cc: Ingo Molnar Cc: Jing Zhang Cc: Jiri Olsa Cc: John Garry Cc: Kajol Jain Cc: Kan Liang Cc: Leo Yan Cc: Liam Howlett Cc: Madhavan Srinivasan Cc: Mark Rutland Cc: Mike Leach Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Ravi Bangoria Cc: Will Deacon Cc: Yang Jihong Cc: linux-arm-kernel@lists.infradead.orgLink: https://lore.kernel.org/r/20230904095104.1162928-4-james.clark@arm.comSigned-off-by: Arnaldo Carvalho de Melo List of files: /linux/tools/perf/tests/Build

3d6dfae889174340af94c7357c8bae018966c524 - perf parse-events: Remove BPF event support

Fri, 11 Aug 2023 20:26:11 +0200

perf parse-events: Remove BPF event supportNew features like the BPF --filter support in perf record have made theBPF event functionality somewhat redundant. As shown by commitfcb027c1a4f6 ("perf tools: Revert enable indices setting syntax for BPFmap") and commit 14e4b9f4289a ("perf trace: Raw augmented syscalls fixlibbpf 1.0+ compatibility") the BPF event support hasn't been wellmaintained and it adds considerable complexity in areas like eventparsing, not least as '/' is a separator for event modifiers as well asin paths.This patch removes support in the event parser for BPF events and thenthe associated functions are removed. This leads to the removal of wholesource files like bpf-loader.c. Removing support means that augmentedsyscalls in perf trace is broken, this will be fixed in a later commitadding support using BPF skeletons.The removal of BPF events causes an unused label warning from flexgenerated code, so update build to ignore it: ``` util/parse-events-flex.c:2704:1: error: label ‘find_rule’ defined but not used [-Werror=unused-label] 2704 | find_rule: /* we branch to this label when backing up */ ```Committer notes:Extracted from a larger patch that was also removing the support forlinking with libllvm and libclang, that were an alternative to using anexternal clang execution to compile the .c event source code into BPFbytecode.Testing it: # perf trace -e /home/acme/git/perf/tools/perf/examples/bpf/augmented_raw_syscalls.c event syntax error: '/home/acme/git/perf/tools/perf/examples/bpf/augmented_raw_syscalls.c' \___ Bad event or PMU Unabled to find PMU or event on a PMU of 'home' Initial error: event syntax error: '/home/acme/git/perf/tools/perf/examples/bpf/augmented_raw_syscalls.c' \___ Cannot find PMU `home'. Missing kernel support? Run 'perf list' for a list of valid events Usage: perf trace [] [] or: perf trace [] -- [] or: perf trace record [] [] or: perf trace record [] -- [] -e, --event event/syscall selector. use 'perf list' to list available events #Signed-off-by: Ian Rogers Acked-by: Jiri Olsa Tested-by: Arnaldo Carvalho de Melo Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Andi Kleen Cc: Andrii Nakryiko Cc: Anshuman Khandual Cc: Athira Rajeev Cc: Brendan Gregg Cc: Carsten Haitzler Cc: Eduard Zingerman Cc: Fangrui Song Cc: He Kuang Cc: Ingo Molnar Cc: James Clark Cc: Kan Liang Cc: Leo Yan Cc: Madhavan Srinivasan Cc: Mark Rutland Cc: Namhyung Kim Cc: Nathan Chancellor Cc: Naveen N. Rao Cc: Nick Desaulniers Cc: Peter Zijlstra Cc: Ravi Bangoria Cc: Rob Herring Cc: Tiezhu Yang Cc: Tom Rix Cc: Wang Nan Cc: Wang ShaoBo Cc: Yang Jihong Cc: Yonghong Song Cc: YueHaibing Cc: bpf@vger.kernel.orgCc: llvm@lists.linux.devLink: https://lore.kernel.org/r/20230810184853.2860737-2-irogers@google.comSigned-off-by: Arnaldo Carvalho de Melo Signed-off-by: Arnaldo Carvalho de Melo List of files: /linux/tools/perf/tests/Build

56b11a2126bf2f422831ecf6112b87a4485b221b - perf bpf: Remove support for embedding clang for compiling BPF events (-e foo.c)

Fri, 11 Aug 2023 17:19:48 +0200

perf bpf: Remove support for embedding clang for compiling BPF events (-e foo.c)This never was in the default build for perf, is difficult to maintainas it uses clang/llvm internals so ditch it, keeping, for now, theexternal compilation of .c BPF into .o bytecode and its subsequentloading, that is also going to be removed, do it separately to helpbisection and to properly document what is being removed and why.Committer notes:Extracted from a larger patch and removed some leftovers, namelydeleting these now unused feature tests: tools/build/feature/test-clang.cpp tools/build/feature/test-cxx.cpp tools/build/feature/test-llvm-version.cpp tools/build/feature/test-llvm.cppTesting the use of BPF events after applying this patch:To use the external clang/llvm toolchain to compile a .c event and thenuse libbpf to load it, to get the syscalls:sys_enter_open* tracepointsand read the filename pointer, putting it into the ring buffer rightafter the usual tracepoint payload for 'perf trace' to then print it: [root@quaco ~]# perf trace -e /home/acme/git/perf-tools-next/tools/perf/examples/bpf/augmented_raw_syscalls.c,open* --max-events=10 0.000 systemd-oomd/959 openat(dfd: CWD, filename: "/proc/meminfo", flags: RDONLY|CLOEXEC) = 12 0.083 abrt-dump-jour/1453 openat(dfd: CWD, filename: "/var/log/journal/d6a97235307247e09f13f326fb607e3c/system.journal", flags: RDONLY|CLOEXEC|NONBLOCK) = 4 0.063 abrt-dump-jour/1454 openat(dfd: CWD, filename: "/var/log/journal/d6a97235307247e09f13f326fb607e3c/system.journal", flags: RDONLY|CLOEXEC|NONBLOCK) = 4 0.082 abrt-dump-jour/1455 openat(dfd: CWD, filename: "/var/log/journal/d6a97235307247e09f13f326fb607e3c/system.journal", flags: RDONLY|CLOEXEC|NONBLOCK) = 4 250.124 systemd-oomd/959 openat(dfd: CWD, filename: "/proc/meminfo", flags: RDONLY|CLOEXEC) = 12 250.521 systemd-oomd/959 openat(dfd: CWD, filename: "/sys/fs/cgroup/user.slice/user-1000.slice/user@1000.service/app.slice/memory.pressure", flags: RDONLY|CLOEXEC) = 12 251.047 systemd-oomd/959 openat(dfd: CWD, filename: "/sys/fs/cgroup/user.slice/user-1000.slice/user@1000.service/app.slice/memory.current", flags: RDONLY|CLOEXEC) = 12 251.162 systemd-oomd/959 openat(dfd: CWD, filename: "/sys/fs/cgroup/user.slice/user-1000.slice/user@1000.service/app.slice/memory.min", flags: RDONLY|CLOEXEC) = 12 251.242 systemd-oomd/959 openat(dfd: CWD, filename: "/sys/fs/cgroup/user.slice/user-1000.slice/user@1000.service/app.slice/memory.low", flags: RDONLY|CLOEXEC) = 12 251.353 systemd-oomd/959 openat(dfd: CWD, filename: "/sys/fs/cgroup/user.slice/user-1000.slice/user@1000.service/app.slice/memory.swap.current", flags: RDONLY|CLOEXEC) = 12 [root@quaco ~]#Same thing, but with a prebuilt .o BPF bytecode: [root@quaco ~]# perf trace -e /home/acme/git/perf-tools-next/tools/perf/examples/bpf/augmented_raw_syscalls.o,open* --max-events=10 0.000 systemd-oomd/959 openat(dfd: CWD, filename: "/proc/meminfo", flags: RDONLY|CLOEXEC) = 12 0.083 abrt-dump-jour/1453 openat(dfd: CWD, filename: "/var/log/journal/d6a97235307247e09f13f326fb607e3c/system.journal", flags: RDONLY|CLOEXEC|NONBLOCK) = 4 0.083 abrt-dump-jour/1455 openat(dfd: CWD, filename: "/var/log/journal/d6a97235307247e09f13f326fb607e3c/system.journal", flags: RDONLY|CLOEXEC|NONBLOCK) = 4 0.062 abrt-dump-jour/1454 openat(dfd: CWD, filename: "/var/log/journal/d6a97235307247e09f13f326fb607e3c/system.journal", flags: RDONLY|CLOEXEC|NONBLOCK) = 4 249.985 systemd-oomd/959 openat(dfd: CWD, filename: "/proc/meminfo", flags: RDONLY|CLOEXEC) = 12 466.763 thermald/1234 openat(dfd: CWD, filename: "/sys/class/powercap/intel-rapl/intel-rapl:0/intel-rapl:0:2/energy_uj") = 13 467.145 thermald/1234 openat(dfd: CWD, filename: "/sys/class/powercap/intel-rapl/intel-rapl:0/energy_uj") = 13 467.311 thermald/1234 openat(dfd: CWD, filename: "/sys/class/thermal/thermal_zone2/temp") = 13 500.040 cgroupify/24006 openat(dfd: 4, filename: ".", flags: RDONLY|CLOEXEC|DIRECTORY|NONBLOCK) = 5 500.295 cgroupify/24006 openat(dfd: 4, filename: "24616/cgroup.procs") = 5 [root@quaco ~]#Signed-off-by: Ian Rogers Tested-by: Arnaldo Carvalho de Melo Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Andi Kleen Cc: Andrii Nakryiko Cc: Anshuman Khandual Cc: Athira Rajeev Cc: Brendan Gregg Cc: Carsten Haitzler Cc: Eduard Zingerman Cc: Fangrui Song Cc: He Kuang Cc: Ingo Molnar Cc: James Clark Cc: Jiri Olsa Cc: Kan Liang Cc: Leo Yan Cc: Madhavan Srinivasan Cc: Mark Rutland Cc: Namhyung Kim Cc: Nathan Chancellor Cc: "Naveen N. Rao" Cc: Nick Desaulniers Cc: Peter Zijlstra Cc: Ravi Bangoria Cc: Rob Herring Cc: Tiezhu Yang Cc: Tom Rix Cc: Wang Nan Cc: Wang ShaoBo Cc: Yang Jihong Cc: Yonghong Song Cc: YueHaibing Link: https://lore.kernel.org/lkml/ZNZWsAXg2px1sm2h@kernel.orgSigned-off-by: Arnaldo Carvalho de Melo List of files: /linux/tools/perf/tests/Build