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    Subject[RFC PATCHSET] perf: Fix cpu/thread map and group event handling
    Resend as it was not sent to LKML due to my cccmd problem.


    When I was playing with event group, I found a bug that didn't count
    such events properly. After looking at the code, it seemed there were
    few more bugs, so I decided to refactor the code during fixing them.

    The first one I found was that 'perf stat --group' doesn't count any
    event but the first. It was a bug on setting attr->disabled and
    attr->enable_on_exec to a member of a group event. And it was related
    to the code which decides the target task/cpu that those events are
    attached to. They did same things, but were separated to each file.

    To clean it up, I've made a new struct and used it for record, stat,
    top and test. During the cleanup I found some combinations of PID/TID,
    UID and CPU weren't allowed and had implicit behaviors. For example,
    'perf record -- sleep 1' will create multiple events as much as number
    of online cpus on the system. I don't think it's intended. So they
    should be fixed and warned to user explicitly, if needed.

    I think we have following prorities and implications:

    * If -p option is given, -t option should be ignored.
    * If -p or -t option is given, -u, -C and/or -a options should be ignored.
    * If -u option is given, -C and/or -a option should be ignored.

    And if only -C option is given, it should be treated as a system-wide
    mode. Also if *NO* option is given (i.e. fork a child for command line
    argument), it should be treated as a task mode, not a system-wide mode.

    These patches are based on latest tip/perf/core: f8d98f109521 ("x86:
    Fix to decode grouped AVX with VEX pp bits").

    Any comments are welcome.

    Namhyung Kim (11):
    perf tools: Introduce struct perf_maps_opts
    perf stat: Convert to perf_maps_opts
    perf top: Convert to perf_maps_opts
    perf tools: Introduce check_target_maps() helper
    perf tools: Make perf_evlist__create_maps() take struct perf_maps_opts
    perf tools: Check more combinations of PID/TID, UID and CPU switches
    perf tools: Fix creation of cpu map
    perf tools: Consolidate target task/cpu checking
    perf stat: Use perf_evlist__create_maps
    perf stat: Fix event grouping on forked task
    perf record: Fix event grouping on forked task

    tools/perf/builtin-record.c | 42 ++++++++++++++----------------
    tools/perf/builtin-stat.c | 56 ++++++++++++++++------------------------
    tools/perf/builtin-test.c | 12 +++++---
    tools/perf/builtin-top.c | 41 ++++++++++++-----------------
    tools/perf/perf.h | 11 ++++++--
    tools/perf/util/evlist.c | 20 ++++++++------
    tools/perf/util/evlist.h | 7 +++--
    tools/perf/util/evsel.c | 11 ++++---
    tools/perf/util/evsel.h | 3 +-
    tools/perf/util/top.c | 15 ++++++-----
    tools/perf/util/top.h | 4 +--
    tools/perf/util/usage.c | 59 +++++++++++++++++++++++++++++++++++++------
    tools/perf/util/util.h | 7 ++++-
    13 files changed, 163 insertions(+), 125 deletions(-)


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