This short patch series add the ability to sample the interrupted machine state for each hardware sample. This is useful to analyze the state after certain events, for instance for function value profiling after a call instruction.
The patch extends the interface with a new PERF_SAMPLE_REGS_INTR smaple_type flag. The register to sample can be named in the sample_regs_intr bitmask for each event. The name and bit position for each register is architecture dependent and provided, just like for PERF_SAMPLE_REGS_USER by asm/perf_regs.h. The support is similar to PERF_SAMPLE_REGS_USER. On Intel x86, the series includes support for capturing the PEBS state as well. When precise sampling is used, the interrupted state is collect from the PEBS records, at least partially. The PEBS machine state is a subset of the machine state. The series provides access to this new feature in perf record with the -I option. It is possible to display the sampled register values using perf report -D. This patch series is the fundation for a future series adding function value profiling. In V2, we address the issues raised during reviews: - add sample parsing test - shorten perf record option to --intr-regs - added man page for perf record -I/--intr-regs option - refactor register printf code between user and intr regs - rebase to v3.16-rc3 In V3, we rebase to 3.16.0+ and made the modifications suggested by PeterZ. We also integrated his patch to improve the layout of perf_sample_data. In V4, we rebase to 3.17-rc3 and we fix the ABI change issue reported by Namhyung Kim. In V5, the patch is rebased to 3.17-rc4 and the bugs reported on LKML about the PEBS machine state copying code have been fixed (a few registers were missing). In V6, we added the missing copy of the eflags from the PEBS mahcine state (reported by Andi). We fixed some formatting issues. We rebased to 3.17-rc6. Peter Zijlstra (1): perf: improve perf_sample_data struct layout Stephane Eranian (5): perf: add ability to sample machine state on interrupt perf/x86: add support for sampling PEBS machine state registers perf tools: add core support for sampling intr machine state regs perf/tests: add interrupted state sample parsing test perf record: add new -I option to sample interrupted machine state arch/x86/kernel/cpu/perf_event_intel_ds.c | 22 ++++++++++++ include/linux/perf_event.h | 37 ++++++++++--------- include/uapi/linux/perf_event.h | 15 +++++++- kernel/events/core.c | 49 +++++++++++++++++++++++-- tools/perf/Documentation/perf-record.txt | 6 ++++ tools/perf/builtin-record.c | 2 ++ tools/perf/perf.h | 1 + tools/perf/tests/sample-parsing.c | 55 +++++++++++++++++++++-------- tools/perf/util/event.h | 1 + tools/perf/util/evsel.c | 46 +++++++++++++++++++++++- tools/perf/util/header.c | 1 + tools/perf/util/session.c | 44 ++++++++++++++++++++--- 12 files changed, 237 insertions(+), 42 deletions(-) -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
