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    Subject[PATCH 0/7] Profiling sleep times (v4)
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    Do you want to know where your code waits locks for a long time?
    Yes! It's for you. This feature helps you to find bottlenecks.

    It's not artificial task. Once one of my colleague was investigating a
    scalability problem. He pressed sysrq-t some times and tried to merge
    call-chains by hand. But perf can do that.

    Problem:
    The problem is that events sched_stat_* contain call-chains of
    non-target tasks.
    About month ago I sent series of patches:

    [PATCH 0/3] trace: add ability to collect call chains of non current task.

    Peter and Frederic explained me, that this solve isn't good and will be
    better to make it in userspace.

    Now it's in userspace. This series expands "perf inject" to be able to
    merge sched_switch events and sched_stat* events. sched_switch events
    contain correct call-chains and sched_stat contains a correct time
    slices.

    v2:
    * Removed all known issues. Now it works completely.
    * Improved usability of sched-stat scripts according with Arun's comments.
    v3: fixed accoding to comments from David Ahem
    v4: rebase to linux-tip

    Andrew Vagin (6):
    perf: use event_name() to get an event name
    perf: add ability to change event according to sample (v3)
    perf: add ability to record event period
    perf: teach "perf inject" to work with files
    perf: teach perf inject to merge sched_stat_* and sched_switch events
    perf: add scripts for profiling sleep times (v2)

    tools/perf/builtin-inject.c | 132 +++++++++++++++++++++--
    tools/perf/builtin-record.c | 1 +
    tools/perf/perf.h | 1 +
    tools/perf/scripts/python/bin/sched-stat-record | 65 +++++++++++
    tools/perf/scripts/python/bin/sched-stat-report | 5 +
    tools/perf/util/event.h | 2 +
    tools/perf/util/evsel.c | 77 +++++++++++++
    tools/perf/util/header.c | 2 +-
    tools/perf/util/session.h | 9 ++
    9 files changed, 286 insertions(+), 8 deletions(-)
    create mode 100644 tools/perf/scripts/python/bin/sched-stat-record
    create mode 100644 tools/perf/scripts/python/bin/sched-stat-report


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