cache spans for commands

crates/bevy_ecs/src/system/commands/mod.rs

@@ -118,9 +118,7 @@ impl SystemBuffer for CommandQueue {
     #[inline]
     fn apply(&mut self, _system_meta: &SystemMeta, world: &mut World) {
         #[cfg(feature = "trace")]
-        let _system_span =
-            bevy_utils::tracing::info_span!("system_commands", name = _system_meta.name())
-                .entered();
+        let _span_guard = _system_meta.commands_span.enter();
         self.apply(world);
     }
 }

crates/bevy_ecs/src/system/commands/parallel_scope.rs

@@ -52,9 +52,7 @@ impl SystemBuffer for ParallelCommandQueue {
     #[inline]
     fn apply(&mut self, _system_meta: &SystemMeta, world: &mut World) {
         #[cfg(feature = "trace")]
-        let _system_span =
-            bevy_utils::tracing::info_span!("system_commands", name = _system_meta.name())
-                .entered();
+        let _system_span = _system_meta.commands_span.enter();
         for cq in &mut self.thread_local_storage {
             cq.get_mut().apply(world);
         }

crates/bevy_ecs/src/system/function_system.rs

@@ -10,6 +10,9 @@ use crate::{
 use bevy_utils::all_tuples;
 use std::{any::TypeId, borrow::Cow, marker::PhantomData};
 
+#[cfg(feature = "trace")]
+use bevy_utils::tracing::{info_span, Span};
+
 use super::{In, IntoSystem, ReadOnlySystem};
 
 /// The metadata of a [`System`].
@@ -22,16 +25,21 @@ pub struct SystemMeta {
     // SystemParams from overriding each other
     is_send: bool,
     pub(crate) last_run: Tick,
+    #[cfg(feature = "trace")]
+    pub(crate) commands_span: Span,
 }
 
 impl SystemMeta {
     pub(crate) fn new<T>() -> Self {
+        let name = std::any::type_name::<T>();
         Self {
-            name: std::any::type_name::<T>().into(),
+            name: name.into(),
             archetype_component_access: Access::default(),
             component_access_set: FilteredAccessSet::default(),
             is_send: true,
             last_run: Tick::new(0),
+            #[cfg(feature = "trace")]
+            commands_span: info_span!("system_commands", name = &*name),
         }
     }