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tracing: Trace Constellation blocked duration (#34536)

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Add a trace for the `select!` macro, so
that we can easily identify the amount of
time we are blocked in the trace
A different option might be to just skip
tracing the `handle_request` function entirely,
since it contains almost nothing interesting.

Signed-off-by: Jonathan Schwender <schwenderjonathan@gmail.com>
This commit is contained in:
Jonathan Schwender 2024-12-09 16:47:24 +01:00 • committed by GitHub
parent dd2fc75b71
commit bb0529d300
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1 changed files with 36 additions and 31 deletions
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67
components/constellation/constellation.rs
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@ -1206,38 +1206,43 @@ where
// produces undefined behaviour, resulting in the destructor
// being called. If this happens, there's not much we can do
// other than panic.
let request = select! {
recv(self.namespace_receiver) -> msg => {
msg.expect("Unexpected script channel panic in constellation").map(Request::PipelineNamespace)
let request = {
#[cfg(feature = "tracing")]
let _span =
tracing::trace_span!("handle_request::select", servo_profiling = true).entered();
select! {
recv(self.namespace_receiver) -> msg => {
msg.expect("Unexpected script channel panic in constellation").map(Request::PipelineNamespace)
}
recv(self.script_receiver) -> msg => {
msg.expect("Unexpected script channel panic in constellation").map(Request::Script)
}
recv(self.background_hang_monitor_receiver) -> msg => {
msg.expect("Unexpected BHM channel panic in constellation").map(Request::BackgroundHangMonitor)
}
recv(self.compositor_receiver) -> msg => {
Ok(Request::Compositor(msg.expect("Unexpected compositor channel panic in constellation")))
}
recv(self.layout_receiver) -> msg => {
msg.expect("Unexpected layout channel panic in constellation").map(Request::Layout)
}
recv(self.network_listener_receiver) -> msg => {
Ok(Request::NetworkListener(
msg.expect("Unexpected network listener channel panic in constellation")
))
}
recv(self.swmanager_receiver) -> msg => {
msg.expect("Unexpected SW channel panic in constellation").map(Request::FromSWManager)
}
recv(self.scheduler_receiver) -> msg => {
msg.expect("Unexpected schedule channel panic in constellation").map(Request::Timer)
}
recv(scheduler_timeout) -> _ => {
// Note: by returning, we go back to the top,
// where check_timers will be called.
return;
},
}
recv(self.script_receiver) -> msg => {
msg.expect("Unexpected script channel panic in constellation").map(Request::Script)
}
recv(self.background_hang_monitor_receiver) -> msg => {
msg.expect("Unexpected BHM channel panic in constellation").map(Request::BackgroundHangMonitor)
}
recv(self.compositor_receiver) -> msg => {
Ok(Request::Compositor(msg.expect("Unexpected compositor channel panic in constellation")))
}
recv(self.layout_receiver) -> msg => {
msg.expect("Unexpected layout channel panic in constellation").map(Request::Layout)
}
recv(self.network_listener_receiver) -> msg => {
Ok(Request::NetworkListener(
msg.expect("Unexpected network listener channel panic in constellation")
))
}
recv(self.swmanager_receiver) -> msg => {
msg.expect("Unexpected SW channel panic in constellation").map(Request::FromSWManager)
}
recv(self.scheduler_receiver) -> msg => {
msg.expect("Unexpected schedule channel panic in constellation").map(Request::Timer)
}
recv(scheduler_timeout) -> _ => {
// Note: by returning, we go back to the top,
// where check_timers will be called.
return;
},
};
let request = match request {