fabi/xenia-rs
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

WEDGE-PROGRESSION: deadline-fire + nt_create_event polarity

Browse Source 
Two surgical fixes from 2026-05-28 that take VdSwap from 1 (stuck since
AUDIT-049 on 10 May) to 6 — first real gameplay-direction rendering
progression. Boot now reaches host_ns=208s (was 51s post-2.V, 767ms
pre-2.V).

2.AF (xenia-app/main.rs:2475, +18 LOC):
  Per-round drain of Scheduler::timed_waits in coord_pre_round, right
  after fire_due_timers. advance_to_next_wake_if_due was only called
  from coord_idle_advance (zero-threads-runnable path), so under load
  expired wait-deadlines never fired. tid=5's 42.95ms deadline sat
  unfired 29s+ in 2.V trace. Post-fix: tid=5 Blocked->Ready, events
  13M->45M (3.5x), boot reaches 152s.

2.AI (xenia-kernel/exports.rs:3043, +16 LOC):
  Fix manual_reset polarity inversion in nt_create_event:
    -let manual_reset = ctx.gpr[5] != 0;
    +let manual_reset = ctx.gpr[5] == 0;
  Canary reference: xenia-canary xboxkrnl_threading.cc:620
    ev->Initialize(!event_type, !!initial_state)
  manual_reset = !event_type, so event_type=0 (NotificationEvent) ->
  manual, event_type=1 (SynchronizationEvent) -> auto. Our Ke-path
  (ensure_dispatcher_object) was already correct; Nt-path was inverted.
  Sylpheed's frame-sync Event (event_type=1 + initial_state=1) was
  mis-classified manual-reset+signaled, staying signaled forever ->
  tid=1 main loop spun at 23kHz (2,798x canary's 60Hz). Post-fix:
  tid=1 NtWait calls 3,233,583->51 (63,400x drop), VdSwap 2->6 (3x
  rendering progression), boot reaches 208s.

Tests: 300 xenia-cpu / 227 xenia-kernel / 5 xenia-app / 19 xenia-path
+ ~30 smaller - all PASS, 0 regressions. Determinism preserved:
2x cold runs bit-identical at 65,691,821 events.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
MechaCat02
2026-06-02 19:43:18 +02:00
parent ad45873a1b
commit acd1656753
2 changed files with 34 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

18
crates/xenia-kernel/src/exports.rs
View File

@@ -3038,9 +3038,23 @@ pub(crate) fn close_handle_internal(state: &mut KernelState, handle: u32) {
}
fn nt_create_event(ctx: &mut PpcContext, mem: &GuestMemory, state: &mut KernelState) {
// r3 = handle_ptr, r4 = obj_attrs, r5 = event_type, r6 = initial_state
// r3 = handle_ptr, r4 = obj_attrs, r5 = event_type, r6 = initial_state.
//
// 2.AI — Xenon DISPATCHER_HEADER `Type` (NT convention):
// 0 = NotificationEvent (manual-reset)
// 1 = SynchronizationEvent (auto-reset)
// Canary mirrors this at `xboxkrnl_threading.cc:620`
// (`ev->Initialize(!event_type, !!initial_state)`) and our own
// `ensure_dispatcher_object` (above, type=0→manual, type=1→auto).
//
// The prior polarity here was inverted (`event_type != 0` → manual),
// which silently mis-classified Sylpheed's per-frame VSync gate as
// manual-reset+initial-signaled. `handle_consume` is a no-op for
// manual-reset events, so the wait fast-path returned SUCCESS every
// call (1.05 M iterations on the wedge handle 0x10e8 in 2.AF, zero
// signal.match) instead of blocking ~17 ms for the next VSync.
let handle_ptr = ctx.gpr[3] as u32;
let manual_reset = ctx.gpr[5] != 0;
let manual_reset = ctx.gpr[5] == 0;
let signaled = ctx.gpr[6] != 0;
let handle = state.alloc_handle_for(KernelObject::Event {
manual_reset,