Add AMD-specific implementation of perf_snapshot_branch_stack static call that allows LBR capture from arbitrary points in the kernel. This is utilized by BPF programs. See patch #3 for all the details. Patches #1 and #2 are preparatory steps to ensure LBR freezing is completely inlined and have no branches, to minimize LBR snapshot contamination. Patch #4 removes an artificial restriction on perf events with LBR enabled. Andrii Nakryiko (4): perf/x86/amd: ensure amd_pmu_core_disable_all() is always inlined perf/x86/amd: avoid taking branches before disabling LBR perf/x86/amd: support capturing LBR from software events perf/x86/amd: don't reject non-sampling events with configured LBR arch/x86/events/amd/core.c | 37 +++++++++++++++++++++++++++++++++++- arch/x86/events/amd/lbr.c | 11 +---------- arch/x86/events/perf_event.h | 11 +++++++++++ 3 files changed, 48 insertions(+), 11 deletions(-) -- 2.43.0
