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.
v4->v5:
- rebased on top of perf/urgent branch to resolve conflicts with
598c2fafc06f ("perf/x86/amd/lbr: Use freeze based on availability").
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 | 13 +------------
arch/x86/events/perf_event.h | 13 +++++++++++++
3 files changed, 50 insertions(+), 13 deletions(-)
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2.43.0
