perfetto cfg: enable compact_sched if "sched" category is on
With this config tweak enabled, the high-frequency events (sched_switch
and sched_waking) will be encoded more efficiently, helping lower trace
size and the tracing overheads.
The encoding is almost lossless, except that the reconstruction (in
trace_processor) will discard the first few scheduling events per cpu.
Very rough numbers from a crosshatch while recording video with a
default Traceur config:
* 5s trace size 25 MB -> 15 MB
* 11.5% -> 7.5% little core utilization (traced_probes + traced)
Both the leftover size and runtime overheads are dominated by atrace
events (i.e. ftrace "print" events).
Bug: 146133021
Change-Id: I4dabfdd0eac84239ee98d1df73c1787a697d69d4
1 file changed
