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| author | Jonathan Davies <jonathan.davies@arm.com> | 2023-10-20 09:00:05 +0100 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2023-10-20 10:00:05 +0200 |
| commit | 5db75d74a10d60d13536836089b8efacc98bc003 (patch) | |
| tree | be5bd39e9129c1ba1f4f8c091a30f8be665a9f2d /lldb/source/Plugins/ScriptInterpreter/Python/Interfaces/ScriptedPlatformPythonInterface.cpp | |
| parent | 2ad41fa73688cd94ad28497a1fdc8841123f8a6f (diff) | |
[BOLT] Filter itrace from perf script mmap & task events (#69585)
perf2bolt launches a few perf script commands and stores the output in
temporary files before processing the output and cleaning them up before
it exits.
The command `perf script --show-mmap-events` outputs PERF_RECORD_MMAP2
and instruction tracing data but when processed it only looks for
PERF_RECORD_MMAP2 and the instruction tracing data is ignored. This is
fine for small amounts of instruction trace data but when I've recorded
Arm ETM or Intel PT AUX I get lots of it
By adding `--no-itrace` is will just show the PERF_RECORD_MMAP2 records
and will save on time running the `perf script`, disk space storing the
output & time parsing the output.
It is the same for `perf script --show-task-events` where BOLT is only
interested in the PERF_RECORD_COMM & PERF_RECORD_FORK records.
### Data
| Perf Record | Perf Data Size | MMap Size | MMap No Itrace Size |
|---|---|---|---|
| perf record -e cs_etm/@tmc_etr0/u | 137K | 4468K | 0.632K |
| perf record -e intel_pt//u | 890K | 33378K | 0.673K |
Diffstat (limited to 'lldb/source/Plugins/ScriptInterpreter/Python/Interfaces/ScriptedPlatformPythonInterface.cpp')
0 files changed, 0 insertions, 0 deletions