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

Jin Yao
2017-10-20T15:31:59Z

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