[PATCH v5 0/6] perf report/script: Support percent and multiple range in --time option

[Jin Yao]

v5:
---
1. There is an issue that the sample walking can only work when
   '--buildid-all' is not enabled. So we need to let the walking
   be able to work even if '--buildid-all' is enabled and let the
   processing skips the dso hit marking for this case.

2. Check if first/last sample time is recorded in perf data file.
   If it's not recorded, return error message to user.

Patched modified in v5:
   perf record: Get the first sample time and last sample time
   perf report: support time percent and multiple time ranges
   perf script: support time percent and multiple time ranges
 
v4:
---
1. Use perf script time style for timestamp printing. Also add with
   the printing of sample duration. For example:

   perf report --header

   time of first sample : 5276531.323099
   time of last sample : 5276555.345625
   sample duration :  24022.526 ms

2. Fix an invalid time string issue. For example,

   perf script --time 10%/10x12321xsdfdasfdsafdsafdsa

   Now in code, it uses strtol to replace atoi.

3. Remove perf_time__skip_sample, only uses perf_time__ranges_skip_sample
   in perf report/perf script.

v3:
---
1. Move the definitions of first_sample_time/last_sample_time from
   perf_session and struct record to perf_evlist and update the
   related code.

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                        |  20 +-
 tools/perf/builtin-report.c                        |  34 ++-
 tools/perf/builtin-script.c                        |  31 ++-
 tools/perf/util/evlist.h                           |   2 +
 tools/perf/util/header.c                           |  60 ++++++
 tools/perf/util/header.h                           |   1 +
 tools/perf/util/time-utils.c                       | 233 +++++++++++++++++++--
 tools/perf/util/time-utils.h                       |   6 +
 11 files changed, 394 insertions(+), 29 deletions(-)

-- 
2.7.4