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Date: Thu, 4 Jul 2019 19:00:17 +0300 From: Alexander Shishkin <alexander.shishkin@...ux.intel.com> To: Peter Zijlstra <a.p.zijlstra@...llo.nl> Cc: Arnaldo Carvalho de Melo <acme@...hat.com>, Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org, kan.liang@...ux.intel.com, Alexander Shishkin <alexander.shishkin@...ux.intel.com> Subject: [PATCH v1 0/7] perf, intel: Add support for PEBS output to Intel PT Hi Peter, Second attempt at the PEBS-via-PT feature. The previous one is here [1]. This one depends on the legitimacy including exclusive events (PT, in this case) in groups, as I posted earlier [2]. Although, it will work without that patch, because this kind of grouping wasn't really disallowed. The first problem with the previous patchset was bad handling of conflicting PEBS events (PEBS->PT and PEBS->DS). This version fails to schedule the first conflicting event, thus allowing conflicting events to be rotated. This is done in an x86 perf patch 2/7. The second problem was lack of guarantees that the PT event is scheduled together with the PEBS->PT event and that it's the correct PT event. This is addressed via grouping. The requirement is that the PEBS event is added to a group where there is a PT event, then a link between them in created. If that group later is broken down, the PEBS event will fail to schedule. This is done in perf core patch 1/7. The rest of the series (2/7..7/7) are the remaining tooling patches needed to enable this are included. The 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. [1] https://marc.info/?l=linux-kernel&m=155679423430002 [2] https://marc.info/?l=linux-kernel&m=156197929026646 Adrian Hunter (5): perf tools: Add aux_source attribute flag perf tools: Add itrace option 'o' to synthesize aux-source events perf intel-pt: Process options for PEBS event synthesis perf tools: Add aux-source config term perf intel-pt: Add brief documentation for PEBS via Intel PT Alexander Shishkin (2): perf: Allow normal events to be sources of AUX data perf/x86/intel: Support PEBS output to PT arch/x86/events/core.c | 45 ++++++++++++ arch/x86/events/intel/core.c | 20 ++++++ arch/x86/events/intel/ds.c | 61 +++++++++++++++- arch/x86/events/perf_event.h | 11 +++ arch/x86/include/asm/msr-index.h | 4 ++ include/linux/perf_event.h | 14 ++++ include/uapi/linux/perf_event.h | 3 +- kernel/events/core.c | 92 ++++++++++++++++++++++++ tools/include/uapi/linux/perf_event.h | 3 +- tools/perf/Documentation/intel-pt.txt | 15 ++++ tools/perf/Documentation/itrace.txt | 2 + tools/perf/Documentation/perf-record.txt | 2 + tools/perf/arch/x86/util/intel-pt.c | 23 ++++++ tools/perf/util/auxtrace.c | 4 ++ tools/perf/util/auxtrace.h | 3 + tools/perf/util/evsel.c | 4 ++ tools/perf/util/evsel.h | 2 + tools/perf/util/intel-pt.c | 18 +++++ tools/perf/util/parse-events.c | 8 +++ tools/perf/util/parse-events.h | 1 + tools/perf/util/parse-events.l | 1 + 21 files changed, 333 insertions(+), 3 deletions(-) -- 2.20.1
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