pf-xusb pumped the sealed-channel bootstrap mailbox — an open+map+close+
unmap plus two heap allocs — on EVERY XInput IOCTL, per pad. A periodic
WDF timer (the pf-gamepad pattern) now owns the pump: adoption,
re-delivery and host-gone detection happen there, and the IOCTL path
reads the cached view. A vanished host still reads as a neutral pad
within one 8 ms tick, and the heartbeat mark still advances per serviced
IOCTL, so the host keeps seeing the GAME-visible polling path move.
Both pad drivers' log() also called OutputDebugStringA unconditionally —
a syscall + CString + format! alloc per logged event in RELEASE builds,
on per-IOCTL paths (SET_STATE hex dumps during rumble, the cyclic
GET_STRING polls). The whole logger now rides the existing
file_log_enabled() gate (debug builds, or PF*_DEBUG_LOG), and dbglog!
skips its format! too.
(pf-gamepad's identical log shape is deliberately untouched: the
unpushed fix/deck-hid-identity branch owns that file right now.)
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
enricobuehlerandClaude Fable 5
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