kernel/linux.git/tools/perf/tests/shell/coresight, branch v7.2.2

perf test cs-etm: Move existing tests to coresight folder

2026-06-10T21:55:49+00:00

There is a subfolder for Coresight tests so might as well keep them all in here. 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

perf test cs-etm: Remove unused Coresight workloads

2026-06-10T21:55:49+00:00

These are now unused and had various issues like not working with out of source builds and being slow to compile. Delete them. Signed-off-by: James Clark Tested-by: Leo Yan 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

perf test cs-etm: Test decoding for concurrent threads test

2026-06-10T21:55:49+00:00

The thread_loop test only looks for context IDs in the raw trace. There's a lot more that can go wrong when decoding these, so replace it with a test that looks at the final output for matching thread names and symbols. In the future we might use timestamps and context switch events to track threads, so looking at context IDs in the raw trace wouldn't always work. Reviewed-by: Leo Yan Signed-off-by: James Clark Tested-by: Leo Yan 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

perf test cs-etm: Replace memcpy test with raw dump stress test

2026-06-10T21:55:49+00:00

Like asm_pure_loop, this memcpy test only checks that 10 of each of a few trace packet types occur after recording a lot of trace, which isn't more specific than other existing Coresight tests. Assume it was supposed to be a stress test for dumping and replace it with one that doesn't require a custom binary and checks for a specific amount of raw output. Don't bother checking for packets because the other tests that test decoding will catch issues with malformed data. This also adds coverage for exit snapshot mode which was missing. Signed-off-by: James Clark Tested-by: Leo Yan 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

perf test cs-etm: Remove asm_pure_loop test

2026-06-10T21:55:48+00:00

It's not obvious what this test is for so remove it. It's not a stress test because it doesn't output lots of data and it's not a functional test because it only looks for raw trace output. It seems to imply that a program written in assembly influences whether trace would be generated by the CPU or not, but the CPU doesn't know what language the program is written in. We already have lots of Coresight tests that test the full pipeline including decoding, and in many more modes of operation than this one, so if no trace was collected they will already fail leaving this one redundant. 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

perf test cs-etm: Replace unroll loop thread with deterministic decode test

2026-06-10T21:55:48+00:00

Testing a long sequence without branches seems like it would be better as a decoder unit test, and this test doesn't test decoding either, so it's not clear what bugs this is trying to catch. The new deterministic workload has somewhat long sequences when built unoptimized, and we can always increase them later if we want to. But now we test that decoding always gives the same result for the same sequence of code which we've never had before. Signed-off-by: James Clark Tested-by: Leo Yan 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

perf test cs-etm: Test process attribution

2026-06-10T21:55:48+00:00

Run the context switch workload on one CPU and trace it to test that symbols are attributed to the correct process and that the attribution changes at the exact point that the context switch happened. 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

perf test coresight: Dismiss clang warning for unroll loop thread

2025-10-06T19:49:25+00:00

clang-18.1.3 on Ubuntu 24.04.2 reports warning: unroll_loop_thread.c:35:25: warning: value size does not match register size specified by the constraint and modifier [-Wasm-operand-widths] 35 | : /* in */ [in] "r" (in) | ^ unroll_loop_thread.c:39:1: warning: non-void function does not return a value [-Wreturn-type] 39 | } | ^ Use the modifier "w" for 32-bit register access and return NULL at the end of thread function. Signed-off-by: Leo Yan Reviewed-by: Ian Rogers Link: https://lore.kernel.org/r/20251006-perf_build_android_ndk-v3-7-4305590795b2@arm.com Cc: Palmer Dabbelt Cc: Albert Ou Cc: Alexandre Ghiti Cc: Nick Desaulniers Cc: Justin Stitt Cc: Bill Wendling Cc: Adrian Hunter Cc: Arnaldo Carvalho de Melo Cc: Jiri Olsa Cc: Namhyung Kim Cc: Nathan Chancellor Cc: James Clark Cc: linux-riscv@lists.infradead.org Cc: llvm@lists.linux.dev Cc: Paul Walmsley Cc: linux-kernel@vger.kernel.org Cc: linux-perf-users@vger.kernel.org Signed-off-by: Arnaldo Carvalho de Melo

perf test coresight: Dismiss clang warning for thread loop

2025-10-06T19:49:25+00:00

clang-18.1.3 on Ubuntu 24.04.2 reports warning: thread_loop.c:41:23: warning: value size does not match register size specified by the constraint and modifier [-Wasm-operand-widths] 41 | : /* in */ [i] "r" (i), [len] "r" (len) | ^ thread_loop.c:37:8: note: use constraint modifier "w" 37 | "add %[i], %[i], #1\n" | ^~~~ | %w[i] thread_loop.c:41:23: warning: value size does not match register size specified by the constraint and modifier [-Wasm-operand-widths] 41 | : /* in */ [i] "r" (i), [len] "r" (len) | ^ thread_loop.c:37:14: note: use constraint modifier "w" 37 | "add %[i], %[i], #1\n" | ^~~~ | %w[i] thread_loop.c:41:23: warning: value size does not match register size specified by the constraint and modifier [-Wasm-operand-widths] 41 | : /* in */ [i] "r" (i), [len] "r" (len) | ^ thread_loop.c:38:8: note: use constraint modifier "w" 38 | "cmp %[i], %[len]\n" | ^~~~ | %w[i] thread_loop.c:41:38: warning: value size does not match register size specified by the constraint and modifier [-Wasm-operand-widths] 41 | : /* in */ [i] "r" (i), [len] "r" (len) | ^ thread_loop.c:38:14: note: use constraint modifier "w" 38 | "cmp %[i], %[len]\n" | ^~~~~~ | %w[len] Use the modifier "w" for 32-bit register access. Signed-off-by: Leo Yan Reviewed-by: Ian Rogers Link: https://lore.kernel.org/r/20251006-perf_build_android_ndk-v3-6-4305590795b2@arm.com Cc: Palmer Dabbelt Cc: Albert Ou Cc: Alexandre Ghiti Cc: Nick Desaulniers Cc: Justin Stitt Cc: Bill Wendling Cc: Adrian Hunter Cc: Arnaldo Carvalho de Melo Cc: Jiri Olsa Cc: Namhyung Kim Cc: Nathan Chancellor Cc: James Clark Cc: linux-riscv@lists.infradead.org Cc: llvm@lists.linux.dev Cc: Paul Walmsley Cc: linux-kernel@vger.kernel.org Cc: linux-perf-users@vger.kernel.org Signed-off-by: Arnaldo Carvalho de Melo

perf test coresight: Dismiss clang warning for memcpy thread

2025-10-06T19:49:25+00:00

clang-18.1.3 on Ubuntu 24.04.2 reports warning: memcpy_thread.c:30:1: warning: non-void function does not return a value in all control paths [-Wreturn-type] 30 | } | ^ Dismiss the warning with returning NULL from the thread function. Signed-off-by: Leo Yan Reviewed-by: Ian Rogers Link: https://lore.kernel.org/r/20251006-perf_build_android_ndk-v3-5-4305590795b2@arm.com Cc: Palmer Dabbelt Cc: Albert Ou Cc: Alexandre Ghiti Cc: Nick Desaulniers Cc: Justin Stitt Cc: Bill Wendling Cc: Adrian Hunter Cc: Arnaldo Carvalho de Melo Cc: Jiri Olsa Cc: Namhyung Kim Cc: Nathan Chancellor Cc: James Clark Cc: linux-riscv@lists.infradead.org Cc: llvm@lists.linux.dev Cc: Paul Walmsley Cc: linux-kernel@vger.kernel.org Cc: linux-perf-users@vger.kernel.org Signed-off-by: Arnaldo Carvalho de Melo