en Copyright 2015 Java http://kernelsources.org:8080/source/history/freebsd/tests/sys/pmc/Makefile#3c3f886e4bc7619f7847ad0d0f996088ddf5915a hwpmc: add regression tests for detaching a live process-mode PMCAttach a process-mode counting PMC to the current process, start it,then detach and release it while it is still loaded on the hardware -the case that previously leaked the PMC's runcount reference andwedged pmc_wait_for_pmc_idle() at release. A second case does the samefrom a multi-threaded process so the sibling threads' references haveto be drained too.The tests need an allocatable process-mode counting event and skipwhere none is available (hwpmc(4) not loaded, or a VM without a vPMU).Reviewed by: adrianMFC after: 2 weeksAssisted-by: Claude Code (Fable 5)Differential Revision: https://reviews.freebsd.org/D58343 List of files: /freebsd/tests/sys/pmc/Makefile Sun, 19 Jul 2026 14:15:20 +0200 Alexander Leidinger <netchild@FreeBSD.org> http://kernelsources.org:8080/source/history/freebsd/tests/sys/pmc/Makefile#2cfd82f747c04f68f679824ba627460e87ab3848 hwpmc: add regression tests for counting-PMC counter wraparoundExercise a process-mode counting PMC whose accumulated count crosses,or already exceeds, the range of the underlying hardware counter.Before the previous commit, the first context switch after thehardware counter wrapped panicked INVARIANTS kernels with "negativeincrement" and silently corrupted the accumulated count on otherkernels.The tests need a hardware counting event backed by a counter narrowerthan 64 bits and skip where none is available (hwpmc(4) not loaded,or a VM without a vPMU).Reviewed by: adrianMFC after: 2 weeksAssisted-by: Claude Code (Fable 5)Differential Revision: https://reviews.freebsd.org/D58341 List of files: /freebsd/tests/sys/pmc/Makefile Sun, 19 Jul 2026 10:08:48 +0200 Alexander Leidinger <netchild@FreeBSD.org>