Sleep Profiling v3

Changes since v2:

* Zero {block,sleep}_start after reading them
* Fix trailing whitespace

Changes since v1:

* Define a new sched_stat tracepoint
* Rebased to -tip

When debugging latency, users want to know where their code
is executing on the CPU (cycle profiling) as well as where
it's waiting sleeping or waiting for IO. The following patch set
tries to address the latter.

Normal users can use this tracepoint without root privileges
and on a system with lots of context switches, load can be
reduced by filtering out uninteresting switches.

Sample command lines:

perf record -gPe sched:sched_stat_sleeptime --filter "sleeptime > 10000" -- ./test
perf report --stdio -g graph -G

Arun Sharma (1):
  tracing, sched: Add a new tracepoint for sleeptime

 include/trace/events/sched.h |   50 ++++++++++++++++++++++++++++++++++++++++++
 kernel/sched/core.c          |    1 +
 kernel/sched/fair.c          |    2 -
 3 files changed, 51 insertions(+), 2 deletions(-)

-- 
1.7.4

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