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Code Issues Packages 1 Wiki Activity

perf(core): immediately schedule another tick if there are unpolled ops (#18611)

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Currently we are "waking up" the runtime if at the end of the event loop
tick there are ops that haven't been polled. Waking up incurs a syscall
and it appears we can do another tick of the event loop, without
going through the "wake up" machinery.
This commit is contained in:
Bartek Iwańczuk 2023-04-14 12:55:47 +02:00 committed by GitHub
parent cb2ca234bb
commit 4317055a3e
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 139 additions and 133 deletions
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18
core/runtime.rs
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@ -1182,6 +1182,7 @@ impl JsRuntime {
state.waker.register(cx.waker());
}
loop {
if has_inspector {
// We poll the inspector first.
let _ = self.inspector().borrow_mut().poll_unpin(cx);
@ -1241,7 +1242,8 @@ impl JsRuntime {
if has_inspector {
let inspector = self.inspector();
let has_active_sessions = inspector.borrow().has_active_sessions();
let has_blocking_sessions = inspector.borrow().has_blocking_sessions();
let has_blocking_sessions =
inspector.borrow().has_blocking_sessions();
if wait_for_inspector && has_active_sessions {
// If there are no blocking sessions (eg. REPL) we can now notify
@ -1263,15 +1265,18 @@ impl JsRuntime {
let state = self.state.borrow();
// Check if more async ops have been dispatched
// during this turn of event loop.
// Check if more async ops have been dispatched during this turn of
// event loop. In such case immediately do another turn of the event loop.
if state.have_unpolled_ops {
continue;
}
// If there are any pending background tasks, we also wake the runtime to
// make sure we don't miss them.
// TODO(andreubotella) The event loop will spin as long as there are pending
// background tasks. We should look into having V8 notify us when a
// background task is done.
if state.have_unpolled_ops
|| pending_state.has_pending_background_tasks
if pending_state.has_pending_background_tasks
|| pending_state.has_tick_scheduled
|| maybe_scheduling
{
@ -1330,7 +1335,8 @@ impl JsRuntime {
state.waker.wake();
}
}
break;
}
Poll::Pending
}