kernel/linux.git/tools/testing/selftests/perf_events, branch v6.18.22

selftests: centralise maybe-unused definition in kselftest.h

2025-09-13T23:55:16+00:00

Several selftests subdirectories duplicated the define __maybe_unused, leading to redundant code. Move to kselftest.h header and remove other definitions. This addresses the duplication noted in the proc-pid-vm warning fix Link: https://lkml.kernel.org/r/20250821101159.2238-1-reddybalavignesh9979@gmail.com Signed-off-by: Bala-Vignesh-Reddy Suggested-by: Andrew Morton Link:https://lore.kernel.org/lkml/20250820143954.33d95635e504e94df01930d0@linux-foundation.org/ Reviewed-by: Wei Yang Acked-by: SeongJae Park Reviewed-by: Ming Lei Acked-by: Mickal Salan [landlock] Cc: Shuah Khan Signed-off-by: Andrew Morton

selftests/perf_events: Add a mmap() correctness test

2025-08-05T19:55:29+00:00

Exercise various mmap(), munmap() and mremap() invocations, which might cause a perf buffer mapping to be split or truncated. To avoid hard coding the perf event and having dependencies on architectures and configuration options, scan through event types in sysfs and try to open them. On success, try to mmap() and if that succeeds try to mmap() the AUX buffer. In case that no AUX buffer supporting event is found, only test the base buffer mapping. If no mappable event is found or permissions are not sufficient, skip the tests. Reserve a PROT_NONE region for both rb and aux tests to allow testing the case where mremap unmaps beyond the end of a mapped VMA to prevent it from unmapping unrelated mappings. Signed-off-by: Lorenzo Stoakes Co-developed-by: Thomas Gleixner Signed-off-by: Thomas Gleixner Reviewed-by: Lorenzo Stoakes

selftests/perf_events: Fix spelling mistake "sycnhronize" -> "synchronize"

2025-04-29T19:35:55+00:00

There is a spelling mistake in an error message. Fix it. Link: https://lore.kernel.org/r/20240327110649.283925-1-colin.i.king@gmail.com Signed-off-by: Colin Ian King Acked-by: Kyle Huey Signed-off-by: Shuah Khan

selftests/perf_events: Test FASYNC with watermark wakeups

2024-04-14T20:26:33+00:00

The test uses PERF_RECORD_SWITCH records to fill the ring buffer and trigger the watermark wakeup, which in turn should trigger an IO signal. Signed-off-by: Kyle Huey Signed-off-by: Ingo Molnar Link: https://lore.kernel.org/r/20240413141618.4160-4-khuey@kylehuey.com

selftests: perf_events: Fix incorrect kernel headers search path

2023-02-13T16:09:45+00:00

Use $(KHDR_INCLUDES) as lookup path for kernel headers. This prevents building against kernel headers from the build environment in scenarios where kernel headers are installed into a specific output directory (O=...). Signed-off-by: Mathieu Desnoyers Cc: Shuah Khan Cc: linux-kselftest@vger.kernel.org Cc: Ingo Molnar Cc: # 5.18+ Signed-off-by: Shuah Khan

selftests/perf_events: Add a SIGTRAP stress test with disables

2022-10-17T14:32:06+00:00

Add a SIGTRAP stress test that exercises repeatedly enabling/disabling an event while it concurrently keeps firing. Signed-off-by: Marco Elver Signed-off-by: Peter Zijlstra (Intel) Link: https://lore.kernel.org/all/Y0E3uG7jOywn7vy3@elver.google.com/

selftests/perf_events: Test modification of perf_event_attr::sig_data

2022-02-02T12:11:40+00:00

Test that PERF_EVENT_IOC_MODIFY_ATTRIBUTES correctly modifies perf_event_attr::sig_data as well. Signed-off-by: Marco Elver Signed-off-by: Peter Zijlstra (Intel) Reviewed-by: Dmitry Vyukov Link: https://lore.kernel.org/r/20220131103407.1971678-2-elver@google.com

signal: Deliver all of the siginfo perf data in _perf

2021-05-18T21:20:54+00:00

Don't abuse si_errno and deliver all of the perf data in _perf member of siginfo_t. Note: The data field in the perf data structures in a u64 to allow a pointer to be encoded without needed to implement a 32bit and 64bit version of the same structure. There already exists a 32bit and 64bit versions siginfo_t, and the 32bit version can not include a 64bit member as it only has 32bit alignment. So unsigned long is used in siginfo_t instead of a u64 as unsigned long can encode a pointer on all architectures linux supports. v1: https://lkml.kernel.org/r/m11rarqqx2.fsf_-_@fess.ebiederm.org v2: https://lkml.kernel.org/r/20210503203814.25487-10-ebiederm@xmission.com v3: https://lkml.kernel.org/r/20210505141101.11519-11-ebiederm@xmission.com Link: https://lkml.kernel.org/r/20210517195748.8880-4-ebiederm@xmission.com Reviewed-by: Marco Elver Signed-off-by: "Eric W. Biederman"

signal, perf: Fix siginfo_t by avoiding u64 on 32-bit architectures

2021-04-23T07:03:16+00:00

The alignment of a structure is that of its largest member. On architectures like 32-bit Arm (but not e.g. 32-bit x86) 64-bit integers will require 64-bit alignment and not its natural word size. This means that there is no portable way to add 64-bit integers to siginfo_t on 32-bit architectures without breaking the ABI, because siginfo_t does not yet (and therefore likely never will) contain 64-bit fields on 32-bit architectures. Adding a 64-bit integer could change the alignment of the union after the 3 initial int si_signo, si_errno, si_code, thus introducing 4 bytes of padding shifting the entire union, which would break the ABI. One alternative would be to use the __packed attribute, however, it is non-standard C. Given siginfo_t has definitions outside the Linux kernel in various standard libraries that can be compiled with any number of different compilers (not just those we rely on), using non-standard attributes on siginfo_t should be avoided to ensure portability. In the case of the si_perf field, word size is sufficient since there is no exact requirement on size, given the data it contains is user-defined via perf_event_attr::sig_data. On 32-bit architectures, any excess bits of perf_event_attr::sig_data will therefore be truncated when copying into si_perf. Since si_perf is intended to disambiguate events (e.g. encoding relevant information if there are more events of the same type), 32 bits should provide enough entropy to do so on 32-bit architectures. For 64-bit architectures, no change is intended. Fixes: fb6cc127e0b6 ("signal: Introduce TRAP_PERF si_code and si_perf to siginfo") Reported-by: Marek Szyprowski Reported-by: Jon Hunter Signed-off-by: Marco Elver Signed-off-by: Peter Zijlstra (Intel) Tested-by: Marek Szyprowski Tested-by: Jon Hunter Link: https://lkml.kernel.org/r/20210422191823.79012-1-elver@google.com

selftests/perf_events: Add kselftest for remove_on_exec

2021-04-16T14:32:42+00:00

Add kselftest to test that remove_on_exec removes inherited events from child tasks. Signed-off-by: Marco Elver Signed-off-by: Peter Zijlstra (Intel) Link: https://lkml.kernel.org/r/20210408103605.1676875-9-elver@google.com