Changes in Build

904708945c07b2b27558b6ffe8923b3df99448f4 - perf test: Compile named_threads workload with -O0

Thu, 11 Jun 2026 13:13:46 +0200

perf test: Compile named_threads workload with -O0The work loop relies on the compiler not optimizing it away, althoughnamed_threads_work is not static for that reason, the compiler couldstill do it.Fix it by compiling without optimization. Also add -fno-inline forconsistency and in case anyone wants to look at callstacks.Fixes: b5dd510be55e8670 ("perf test: Add named_threads workload")Closes: https://lore.kernel.org/all/20260609160001.2739E1F00893@smtp.kernel.orgReported-by: sashiko-bot Reviewed-by: Leo Yan Signed-off-by: James Clark Cc: Ian Rogers Cc: Namhyung Kim Signed-off-by: Arnaldo Carvalho de Melo List of files: /linux/tools/perf/tests/workloads/Build

2540d48595b9289f1fe6288e080c329a0fd7ce47 - perf test: Add named_threads workload

Tue, 09 Jun 2026 16:40:14 +0200

perf test: Add named_threads workloadAdd a workload that runs X threads that run a unique function named"named_threads_thread[x]" which performs a multiplication in a loop forY loops. Each thread sets its name to "thread[x]".This can be used to test that processor trace decoding handlesconcurrent threads correctly and the correct symbols and thread namesare assigned to samples.Signed-off-by: James Clark Cc: Amir Ayupov Cc: Ian Rogers Cc: Jiri Olsa Cc: Jonathan Corbet Cc: Leo Yan Cc: Mike Leach Cc: Namhyung Kim Cc: Paschalis Mpeis Cc: Shuah Khan Cc: Suzuki Poulouse Signed-off-by: Arnaldo Carvalho de Melo List of files: /linux/tools/perf/tests/workloads/Build

3fdf30607e28290d914c44b035f35a9a92512562 - perf test: Add deterministic workload

Tue, 09 Jun 2026 16:40:10 +0200

perf test: Add deterministic workloadAdd a workload that does the same thing every time for testing CPU tracedecoding.Reviewed-by: Leo Yan Signed-off-by: James Clark Cc: Amir Ayupov Cc: Ian Rogers Cc: Jiri Olsa Cc: Jonathan Corbet Cc: Mike Leach Cc: Namhyung Kim Cc: Paschalis Mpeis Cc: Shuah Khan Cc: Suzuki Poulouse Signed-off-by: Arnaldo Carvalho de Melo List of files: /linux/tools/perf/tests/workloads/Build

4cb5dd0379999af455941ab87d0b30c2ba7d9d66 - perf test: Add a workload that forces context switches

Tue, 09 Jun 2026 16:40:08 +0200

perf test: Add a workload that forces context switchesThis workload launches two processes that block when reading and writingto each other forcing the other process to be scheduled for eachread/write pair.Signed-off-by: James Clark Cc: Amir Ayupov Cc: Ian Rogers Cc: Jiri Olsa Cc: Jonathan Corbet Cc: Leo Yan Cc: Mike Leach Cc: Namhyung Kim Cc: Paschalis Mpeis Cc: Shuah Khan Cc: Suzuki Poulouse Signed-off-by: Arnaldo Carvalho de Melo List of files: /linux/tools/perf/tests/workloads/Build

a77ecea7ced2fef7cc0a8ad0323542f781ad9788 - perf test: Remove /usr/bin/cc dependency from Intel PT shell test

Tue, 02 Jun 2026 19:41:27 +0200

perf test: Remove /usr/bin/cc dependency from Intel PT shell testIn test_intel_pt.sh, the test script compiled two external C programs atruntime using /usr/bin/cc (a thread loop workload and a JIT self-modifying workload). Relying on external C compilers inside shell testsfrequently causes failures in continuous integration environments.Create a built-in 'jitdump' workload and switch test_intel_pt.sh to use'perf test -w thloop' and 'perf test -w jitdump'. Also add multi-architecture compatibility without external C compiler dependencies, theworkload instruction arrays dynamically encode CHK_BYTE into opcodesacross x86, ARM32, ARM64, RISC-V, PowerPC, MIPS, LoongArch, and s390x.Some minor include fixes for util/jitdump.h.Assisted-by: Gemini-CLI:Google Gemini 3Signed-off-by: Ian Rogers Tested-by: Arnaldo Carvalho de Melo Cc: Adrian Hunter Cc: Alexander Shishkin 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/workloads/Build

2e05bb52a12d3cdb81f3b6f5de5cb3905d383552 - perf test workload: Add code_with_type test workload

Sun, 08 Feb 2026 13:22:24 +0100

perf test workload: Add code_with_type test workloadThe purpose of the workload is to gather samples of rust runtime. Toachieve that it has a dummy rust library linked with it.Per recommendations for such scenarios [1], the rust library isstatically linked.An example:$ perf record perf test -w code_with_type[ perf record: Woken up 1 times to write data ][ perf record: Captured and wrote 0.160 MB perf.data (4074 samples) ]$ perf report --stdio --dso perf -s srcfile,srcline 45.16% ub_checks.rs ub_checks.rs:72 6.72% code_with_type.rs code_with_type.rs:15 6.64% range.rs range.rs:767 4.26% code_with_type.rs code_with_type.rs:21 4.23% range.rs range.rs:0 3.99% code_with_type.rs code_with_type.rs:16 [...][1]: https://doc.rust-lang.org/reference/linkage.html#mixed-rust-and-foreign-codebasesSigned-off-by: Dmitrii Dolgov <9erthalion6@gmail.com>Tested-by: Arnaldo Carvalho de Melo Cc: Ian Rogers Cc: Namhyung Kim Signed-off-by: Arnaldo Carvalho de Melo List of files: /linux/tools/perf/tests/workloads/Build

27fc6f565d06837e71001368c84ee71e5221ce48 - perf test workload: Add inlineloop test workload

Sun, 11 Jan 2026 05:13:37 +0100

perf test workload: Add inlineloop test workloadThe purpose of this workload is to gather samples in an inlinedfunction. This can be used to test whether inlined addr2line workscorrectly.Committer testing: $ perf record perf test -w inlineloop 1 [ perf record: Woken up 2 times to write data ] [ perf record: Captured and wrote 0.161 MB perf.data (4005 samples) ] $ perf report --stdio --dso perf -s srcfile,srcline # # Total Lost Samples: 0 # # Samples: 4K of event 'cpu/cycles/Pu' # Event count (approx.): 5535180842 # # Overhead Source File Source:Line # ........ ............ ............... # 99.04% inlineloop.c inlineloop.c:21 0.46% inlineloop.c inlineloop.c:20 # $Reviewed-by: James Clark Signed-off-by: Ian Rogers Tested-by: Arnaldo Carvalho de Melo Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Howard Chu Cc: Ingo Molnar Cc: Jiri Olsa Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Stephen Brennan Cc: Tony Jones Signed-off-by: Arnaldo Carvalho de Melo List of files: /linux/tools/perf/tests/workloads/Build

9f0fa213790e3633d37e981386da99149573135b - perf test: Extend branch stack sampling test for Arm64 BRBE

Wed, 13 Aug 2025 15:38:51 +0200

perf test: Extend branch stack sampling test for Arm64 BRBEBRBE emits IRQ and ERET branches for branching and returning fromtrapped instructions. Add a test that loops on a trapped instruction(MRS - Read special register) for this.Extend the expected 'any_call' branches to include FAULT_DATA andFAULT_INST as these are emitted by BRBE.Reviewed-by: Ian Rogers Co-developed-by: German Gomez Signed-off-by: German Gomez Signed-off-by: James Clark Cc: Adam Young Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Anshuman Khandual Cc: Ingo Molnar Cc: Jiri Olsa Cc: Mark Rutland Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Rob Herring Cc: Will Deacon Signed-off-by: Arnaldo Carvalho de Melo List of files: /linux/tools/perf/tests/workloads/Build

3656e566cf03ab0f959b2bd6f8274ee9799641e6 - perf test: Add landlock workload

Mon, 24 Jun 2024 20:13:42 +0200

perf test: Add landlock workloadWe'll use it to add a regression test for the BTF augmentation of enumarguments for tracepoints in 'perf trace': root@x1:~# perf trace -e landlock_add_rule perf test -w landlock 0.000 ( 0.009 ms): perf/747160 landlock_add_rule(ruleset_fd: 11, rule_type: LANDLOCK_RULE_PATH_BENEATH, rule_attr: 0x7ffd8e258594, flags: 45) = -1 EINVAL (Invalid argument) 0.011 ( 0.002 ms): perf/747160 landlock_add_rule(ruleset_fd: 11, rule_type: LANDLOCK_RULE_NET_PORT, rule_attr: 0x7ffd8e2585a0, flags: 45) = -1 EINVAL (Invalid argument) root@x1:~#Committer notes:It was agreed on the discussion (see Link below) to shorten then name ofthe workload from 'landlock_add_rule' to 'landlock', and I moved it to aseparate patch.Also, to address a build failure from Namhyung, I stopped loadinglinux/landlock.h and instead added the used defines, enums and types tomake this build in older systems. All we want is to emit the syscall andintercept it.Suggested-by: Arnaldo Carvalho de Melo Signed-off-by: Howard Chu Tested-by: Arnaldo Carvalho de Melo Cc: Adrian Hunter Cc: Ian Rogers Cc: Jiri Olsa Cc: Kan Liang Cc: Namhyung Kim Link: https://lore.kernel.org/lkml/CAH0uvohaypdTV6Z7O5QSK+va_qnhZ6BP6oSJ89s1c1E0CjgxDA@mail.gmail.comLink: https://lore.kernel.org/r/20240624181345.124764-1-howardchu95@gmail.comLink: https://lore.kernel.org/r/20240624181345.124764-6-howardchu95@gmail.comSigned-off-by: Arnaldo Carvalho de Melo List of files: /linux/tools/perf/tests/workloads/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/workloads/Build

3dfc01fe9d12a1e832f49deab37279faa8a9ebc8 - perf test: Add 'datasym' test workload

Thu, 17 Nov 2022 00:38:53 +0100

perf test: Add 'datasym' test workloadThe datasym workload is to check if perf mem command gets the dataaddresses precisely. This is needed for data symbol test. $ perf test -w datasymI had to keep the buf1 in the data section, otherwise it could endup in the BSS and was mmaped as a separate //anon region, then itwas not symbolized at all. It needs to be fixed separately.Committer notes:Add a -U _FORTIFY_SOURCE to the datasym CFLAGS, as the main perf flagsset it and it requires building with optimization, and this new test hasa -O0.Signed-off-by: Namhyung Kim Cc: Adrian Hunter Cc: Athira Jajeev Cc: German Gomez Cc: Ian Rogers Cc: Ingo Molnar Cc: James Clark Cc: Jiri Olsa Cc: Leo Yan Cc: Peter Zijlstra Cc: Zhengjun Xing Link: https://lore.kernel.org/r/20221116233854.1596378-12-namhyung@kernel.orgSigned-off-by: Arnaldo Carvalho de Melo List of files: /linux/tools/perf/tests/workloads/Build

a104f0ea99d846df19aad8a5476eb9bc39fa42ca - perf test: Add 'brstack' test workload

Thu, 17 Nov 2022 00:38:51 +0100

perf test: Add 'brstack' test workloadThe brstack is to run different kinds of branches repeatedly. This isnecessary for brstack test case to verify if it has correct branch info. $ perf test -w brstackI renamed the internal functions to have brstack_ prefix as it's toogeneric name.Add a -U_FORTIFY_SOURCE to the brstack CFLAGS, as the main perf flagsset it and it requires building with optimization, and this new test hasa -O0.Signed-off-by: Namhyung Kim Cc: Adrian Hunter Cc: Athira Jajeev Cc: German Gomez Cc: Ian Rogers Cc: Ingo Molnar Cc: James Clark Cc: Jiri Olsa Cc: Leo Yan Cc: Peter Zijlstra Cc: Zhengjun Xing Link: https://lore.kernel.org/r/20221116233854.1596378-10-namhyung@kernel.orgSigned-off-by: Arnaldo Carvalho de Melo List of files: /linux/tools/perf/tests/workloads/Build

39281709a6e2301ac4c6ac7015c7793392ca2dfe - perf test: Add 'sqrtloop' test workload

Thu, 17 Nov 2022 00:38:49 +0100

perf test: Add 'sqrtloop' test workloadThe sqrtloop creates a child process to run an infinite loop callingsqrt() with rand(). This is needed for ARM SPE fork test. $ perf test -w sqrtloopIt can take an optional argument to specify how long it will run inseconds (default: 1).Committer notes:Explicitely ignored the sqrt() return to fix the build on systems wherethe compiler complains it isn't being used.And added a sqrtloop specific CFLAGS to disable optimizations to makethis a bit more robust wrt dead code elimination.Doing that a -U_FORTIFY_SOURCE needs to be added, as -O0 is incompatiblewith it.Signed-off-by: Namhyung Kim Cc: Adrian Hunter Cc: Athira Jajeev Cc: German Gomez Cc: Ian Rogers Cc: Ingo Molnar Cc: James Clark Cc: Jiri Olsa Cc: Leo Yan Cc: Peter Zijlstra Cc: Zhengjun Xing Link: https://lore.kernel.org/r/20221116233854.1596378-8-namhyung@kernel.orgSigned-off-by: Arnaldo Carvalho de Melo List of files: /linux/tools/perf/tests/workloads/Build

41522f7442905814c654dbe2ca7b8d3605c7e0cc - perf test: Add 'leafloop' test workload

Thu, 17 Nov 2022 00:38:47 +0100

perf test: Add 'leafloop' test workloadThe leafloop workload is to run an infinite loop in the test_leaffunction. This is needed for the ARM fp callgraph test to verify if itgets the correct callchains. $ perf test -w leafloopCommitter notes:Add a: -U_FORTIFY_SOURCEto the leafloop CFLAGS as the main perf flags set it and it requiresbuilding with optimization, and this new test has a -O0.Signed-off-by: Namhyung Kim Cc: Adrian Hunter Cc: Athira Jajeev Cc: German Gomez Cc: Ian Rogers Cc: Ingo Molnar Cc: James Clark Cc: Jiri Olsa Cc: Leo Yan Cc: Peter Zijlstra Cc: Zhengjun Xing Link: https://lore.kernel.org/r/20221116233854.1596378-6-namhyung@kernel.orgSigned-off-by: Arnaldo Carvalho de Melo List of files: /linux/tools/perf/tests/workloads/Build

69b352927885b17f03d3ee4ee38f580699af107a - perf test: Add 'thloop' test workload

Thu, 17 Nov 2022 00:38:45 +0100

perf test: Add 'thloop' test workloadThe thloop is similar to noploop but runs in two threads. This isneeded to verify perf record --per-thread to handle multi-threadedprograms properly. $ perf test -w thloopIt also takes an optional argument to specify runtime in seconds(default: 1).Signed-off-by: Namhyung Kim Cc: Adrian Hunter Cc: Athira Jajeev Cc: German Gomez Cc: Ian Rogers Cc: Ingo Molnar Cc: James Clark Cc: Jiri Olsa Cc: Leo Yan Cc: Peter Zijlstra Cc: Zhengjun Xing Link: https://lore.kernel.org/r/20221116233854.1596378-4-namhyung@kernel.orgSigned-off-by: Arnaldo Carvalho de Melo List of files: /linux/tools/perf/tests/workloads/Build

f215054d749b17c56e014fdca2fcc592dac4529c - perf test: Add -w/--workload option

Thu, 17 Nov 2022 00:38:43 +0100

perf test: Add -w/--workload optionThe -w/--workload option is to run a simple workload used by testing.This adds a basic framework to run the workloads and 'noploop' workloadas an example. $ perf test -w noploopThe noploop does a loop doing nothing (NOP) for a second by default.It can have an optional argument to specify the time in seconds.Signed-off-by: Namhyung Kim Cc: Adrian Hunter Cc: Athira Jajeev Cc: German Gomez Cc: Ian Rogers Cc: Ingo Molnar Cc: James Clark Cc: Jiri Olsa Cc: Leo Yan Cc: Peter Zijlstra Cc: Zhengjun Xing Link: https://lore.kernel.org/r/20221116233854.1596378-2-namhyung@kernel.orgSigned-off-by: Arnaldo Carvalho de Melo List of files: /linux/tools/perf/tests/workloads/Build