[BOLT] Filter itrace from perf script mmap & task events

[jonathandavies-arm]

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

[github-actions]

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[jonathandavies-arm]

@maksfb @rafaelauler Please can I have a review. I can't add the Bolt label myself yet.

[rafaelauler]

Thanks!