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[Docs] (P15): queue the pwait latency trace

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swung0x48
2026-10-10 04:14:08 -04:00
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docs/Disaggregated/notes/perf-p15/HANDOFF.md
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@@ -169,6 +169,13 @@ The plan and its measurements are in [PLAN-P15.md](PLAN-P15.md); the audit is in
- fence create/signal times;
- SurfaceFlinger latch/release.
- Decide whether earlier submission (or another portable change) shrinks the wait.
5c. QUEUED 2026-10-10, after the quick before/after fps run:
- Capture: one Perfetto run per arm (Espryt monolith base vs pwgate+pmflush; Magma monolith base vs
pwgate+pmflush+extra 2), traces in scratchpad p15/runs/pwlat.
- Derive offline: a rough per-frame timeline, and the input-to-present latency from the SF
frametimeline.
- Write it up in docs/Disaggregated/pwait/: what the levers do, the effect on fps and latency,
the knob, and the FIFO caveat (extra images add latency only with vsync on).
6. Smaller follow-ups:
- DONE 2026-10-09: `bench_session.sh stop` now runs `pin_clocks.sh restore` first (verified over a
17-session run: max clocks back to stock after every session, daemons running, no session file).