FreeBSD source tree https://cgit-dev.freebsd.org/src/atom?h=main 2025-07-03T14:48:34Z 2025-07-03T14:48:34Z Ruslan Bukin br@FreeBSD.org 2025-07-03T13:10:45Z urn:sha1:df114daef4c48548c3c2b86717612761185ae18f The HWT framework provides infrastructure for hardware-assisted tracing. It collects detailed information about software execution and records it as "events" in highly compressed format into DRAM. The events cover information about control flow changes of a program, whether branches taken or not, exceptions taken, timing information, cycles elapsed and more. This allows to reconstruct entire program flow of a given application. This comes with separate machine-dependent tracing backends for trace collection, trace decoder libraries and an instrumentation tool. Reviewed by: kib (sys/kern bits) Sponsored by: UKRI Differential Revision: https://reviews.freebsd.org/D40466