Messages in this thread | | | From | Adrian Hunter <> | Subject | [PATCH V2 0/3] perf intel-pt: Add PEBS-via-PT side-band | Date | Thu, 1 Jul 2021 16:17:29 +0300 |
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Hi
PEBS output to Intel Processor Trace was introduced with Atom processors based on Tremont. Currently there is software support only for a single PEBS-via-PT event.
Here is support for multiple PEBS-via-PT events.
The first patch is the kernel change which adds a new event, namely PERF_RECORD_AUX_OUTPUT_HW_ID which contains the counter index. That is output when the PEBS-via-PT event is enabled in hardware. There is an optimization, to report the index only when it changes for the event. That will work only so long as all PEBS-via-PT events are scheduled together, which they are for a recording session because they are in a single group.
Also no attribute bit is used to select the new event, so a new kernel is not compatible with older perf tools. The assumption being that PEBS-via-PT is sufficiently esoteric that users will not be troubled by this.
The second patch adds the usual boiler plate to perf tools for a new event.
The third patch adds support for processing the new event by perf tool's Intel PT decoder.
Changes in V2: perf/x86: Add new event for AUX output counter index Use callback from x86_assign_hw_event
Adrian Hunter (3): perf/x86: Add new event for AUX output counter index perf tools: Add support for PERF_RECORD_AUX_OUTPUT_HW_ID perf intel-pt: Add support for PERF_RECORD_AUX_OUTPUT_HW_ID
arch/x86/events/core.c | 6 +++ arch/x86/events/intel/core.c | 7 +++ arch/x86/events/perf_event.h | 1 + include/linux/perf_event.h | 1 + include/uapi/linux/perf_event.h | 15 ++++++ kernel/events/core.c | 30 +++++++++++ tools/include/uapi/linux/perf_event.h | 15 ++++++ tools/lib/perf/include/perf/event.h | 6 +++ tools/perf/Documentation/perf-intel-pt.txt | 7 ++- tools/perf/builtin-inject.c | 4 +- tools/perf/builtin-record.c | 2 +- tools/perf/util/event.c | 18 +++++++ tools/perf/util/event.h | 5 ++ tools/perf/util/intel-pt.c | 85 ++++++++++++++++++++++++++++-- tools/perf/util/machine.c | 10 ++++ tools/perf/util/machine.h | 2 + tools/perf/util/session.c | 5 ++ tools/perf/util/tool.h | 1 + 18 files changed, 213 insertions(+), 7 deletions(-)
Regards Adrian
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