hi, adding support to read sample values through the PERF_SAMPLE_READ sample type. It's now possible to specify 'S' modifier for an event and get its sample value by PERF_SAMPLE_READ.
For group the 'S' modifier will enable sampling only for the leader and read all the group member by PERF_SAMPLE_READ smple type with PERF_FORMAT_GROUP read format. This was first introduced in here: https://lkml.org/lkml/2012/10/20/75 Example: $ perf record -e '{cycles,cache-misses}:S' ls ... $ perf report --group --show-total-period --stdio ... # Samples: 36 of event 'anon group { cycles, cache-misses }' # Event count (approx.): 12585593 # # Overhead Period Command Shared Object Symbol # ................ ........................ ....... ................. .......................... # 19.92% 1.20% 2505936 31 ls [kernel.kallsyms] [k] mark_held_locks 13.74% 0.47% 1729327 12 ls [kernel.kallsyms] [k] sched_clock_local 13.64% 23.72% 1716147 612 ls ld-2.14.90.so [.] check_match.10805 13.12% 23.22% 1650778 599 ls libc-2.14.90.so [.] _nl_intern_locale_data 11.24% 29.19% 1414554 753 ls [kernel.kallsyms] [k] sched_clock_cpu 8.50% 0.35% 1070150 9 ls [kernel.kallsyms] [k] check_chain_key ... The patchset is based on following fix: http://lkml.org/lkml/2013/2/4/122 and is available also at: git://git.kernel.org/pub/scm/linux/kernel/git/jolsa/linux.git perf/group6 TODO: add column names as suggested by Ingo in the original discussion. thanks, jirka Cc: Arnaldo Carvalho de Melo <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: Paul Mackerras <[email protected]> Cc: Corey Ashford <[email protected]> Cc: Frederic Weisbecker <[email protected]> Cc: Namhyung Kim <[email protected]> --- Jiri Olsa (11): perf ui/hist: Add support to display whole group data for raw columns perf: Add PERF_EVENT_IOC_ID ioctl to return event ID perf: Do not get values from disabled counters in group format read perf tools: Use PERF_EVENT_IOC_ID perf ioctl to read event id perf tools: Add support for parsing PERF_SAMPLE_READ sample type perf tools: Fix event ID retrieval for group format read case perf tools: Add perf_evlist__id2sid function to get event ID related data perf tools: Add PERF_SAMPLE_READ sample related processing perf tools: Add 'S' event/group modifier to read sample value perf tests: Add attr record group sampling test perf tests: Add parse events tests for leader sampling include/uapi/linux/perf_event.h | 1 + kernel/events/core.c | 12 ++++++++- tools/perf/Documentation/perf-list.txt | 1 + tools/perf/tests/attr/test-record-group-sampling | 36 ++++++++++++++++++++++++++ tools/perf/tests/parse-events.c | 115 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ tools/perf/ui/hist.c | 53 +++++++++++++++++++------------------- tools/perf/util/event.h | 18 +++++++++++++ tools/perf/util/evlist.c | 73 +++++++++++++++++++++++++++++++++++++++++++++++----- tools/perf/util/evlist.h | 4 +++ tools/perf/util/evsel.c | 59 ++++++++++++++++++++++++++++++++++++++++-- tools/perf/util/evsel.h | 4 +++ tools/perf/util/parse-events.c | 8 +++++- tools/perf/util/parse-events.l | 2 +- tools/perf/util/session.c | 110 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++- 14 files changed, 457 insertions(+), 39 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
