[PATCH v2 0/6] perf report/script: Support percent and multiple range in --time option

[Jin Yao]

v2:
---
1. This patch creates a new header feature type HEADER_SAMPLE_TIME and related
   ops. Save the first sample time and the last sample time to the feature
   section in perf file header.

2. Add checking for last element in time range.

   For example, select the first and second 10% time slices.
   perf report --time 10%/1,10%/2

   Note that now it includes the last element in [10%, 20%] but it
   doesn't include the last element in [0, 10%). It's to avoid
   the overlap.

Following patches are changed:

   perf header: Record first sample time and last sample time in perf file header
   perf record: Get the first sample time and last sample time
   perf util: Create function to perform multiple time range checking

v1: initial post
----------------

Current perf report/script/... have a --time option to limit the time
range of output. But it only supports the absolute time.

The patch series extend this option to let it support percent of time
and support the multiple time ranges.

For example:

1. Select the second 10% time slice
   perf report --time 10%/2

2. Select from 0% to 10% time slice
   perf report --time 0%-10%

It also support the multiple time ranges.

3. Select the first and second 10% time slices
   perf report --time 10%/1,10%/2

4. Select from 0% to 10% and 30% to 40% slices
   perf report --time 0%-10%,30%-40%

Jin Yao (6):
  perf header: Record first sample time and last sample time in perf
    file header
  perf record: Get the first sample time and last sample time
  perf util: Create function to parse time percent
  perf util: Create function to perform multiple time range checking
  perf report: support time percent and multiple time ranges
  perf script: support time percent and multiple time ranges

 tools/perf/Documentation/perf-report.txt           |  16 ++
 tools/perf/Documentation/perf-script.txt           |  16 ++
 tools/perf/Documentation/perf.data-file-format.txt |   4 +
 tools/perf/builtin-record.c                        |  17 ++
 tools/perf/builtin-report.c                        |  24 ++-
 tools/perf/builtin-script.c                        |  21 +-
 tools/perf/util/evlist.h                           |   2 +
 tools/perf/util/header.c                           |  49 +++++
 tools/perf/util/header.h                           |   1 +
 tools/perf/util/session.h                          |   2 +
 tools/perf/util/time-utils.c                       | 225 +++++++++++++++++++--
 tools/perf/util/time-utils.h                       |   6 +
 12 files changed, 366 insertions(+), 17 deletions(-)

-- 
2.7.4