Module profiler 

Brick-phase profiler for GPU sharing operations (GPU-SHARE-005).

Follows the StepProfiler pattern from KAIZEN-047.

Contract C-GPUPROF-001

Zero-overhead when disabled: all begin/end calls are no-ops with zero Instant::now() calls.

Phases

1. lock_acq — flock(LOCK_EX) acquisition time
2. ledger_rd — JSON read + deserialize + PID prune
3. vram_qry — cuMemGetInfo / NVML call
4. ledger_wr — Atomic write (temp + rename)
5. lock_rel — flock release (close fd)
6. wait_poll — Single poll iteration

Structs

GpuProfiler

Brick-phase profiler for GPU sharing operations.

Constants

LEDGER_RD

LEDGER_WR

LOCK_ACQ

Phase indices.

LOCK_REL

VRAM_QRY

WAIT_POLL