Hi Peter, New PEBS feature: output to Intel PT stream instead of the DS area. It's theoretically useful in virtualized environments, where DS area can't be used. It's also good for those who are interested in instruction trace for context of the PEBS events. As PEBS goes, it can provide LBR context with all the branch-related information that PT doesn't provide at the moment.
PEBS records are packetized in the PT stream, so instead of extracting them in the PMI, we leave it to the perf tool, because real time PT decoding is not practical. Tooling patches are not included, but can be found here [1]. Added is an attribute bit 'aux_source' to mean that an event is a source of AUX data. This bit enables PEBS output to PT. [1] http://git.infradead.org/users/ahunter/linux-perf.git Alexander Shishkin (2): perf: Allow normal events to be sources of AUX data perf/x86/intel: Support PEBS output to PT arch/x86/events/intel/core.c | 13 +++++++ arch/x86/events/intel/ds.c | 59 +++++++++++++++++++++++++++++++- arch/x86/events/perf_event.h | 9 +++++ arch/x86/include/asm/msr-index.h | 3 ++ include/uapi/linux/perf_event.h | 3 +- kernel/events/core.c | 9 +++++ 6 files changed, 94 insertions(+), 2 deletions(-) -- 2.20.1
