Add profiling of cpp code

.github/workflows/profile_linux.yml

@@ -8,7 +8,8 @@ on:
         type: string
 
 env:
-  PYROSCOPE_APPLICATION_NAME: 'godot.benchmarks'
+  PYROSCOPE_APPLICATION_NAME: 'godot.benchmarks.jvm'
+  PYROSCOPE_APPLICATION_NAME_NATIVE: 'godot.benchmarks.native'
   PYROSCOPE_PROFILER_ALLOC: 512k
   PYROSCOPE_PROFILER_LOCK: 10ms
   PYROSCOPE_LABELS: "os=linux,arch=x86_64"
@@ -67,6 +68,29 @@ jobs:
         run: |
           cd modules/kotlin_jvm/harness/benchmarks/
           chmod +x ../../../../bin/godot.*
-          # no embedded jre
+          
+          # download alloy to profile the cpp code
+          curl -LO https://github.com/grafana/alloy/releases/download/v1.1.0/alloy-linux-amd64.zip
+
+          # Unzip alloy file
+          unzip alloy-linux-amd64.zip
+          
+          chmod +x alloy-linux-amd64
+          # Run the executable in the background
+          ./alloy-linux-amd64 run profiling/config.alloy --stability.level public-preview &
+          
+          # Store the PID of the background process
+          ALLOY_PID=$!
+          
+          # Wait for 10 seconds to allow alloy to start up
+          sleep 10
+          
+          # execute the benchmarks
           ./gradlew profileAndUpload
+          
+          # Wait for another 10 seconds to allow alloy to submit any queued profiling data
+          sleep 10
+          
+          # Stop the backgrounded process using its PID
+          kill $ALLOY_PID
         timeout-minutes: 30

harness/benchmarks/.gitignore

@@ -454,3 +454,4 @@ fabric.properties
 /.godot/
 /benchmark-results.json
 /benchmark-results-latest.json
+data-alloy/

harness/benchmarks/profiling/config.alloy

@@ -0,0 +1,45 @@
+
+// we discover all processes
+discovery.process "all" {}
+
+// relabel job does basically provide us the means to filter out the processes we're interrested in
+discovery.relabel "godot_process" {
+   	targets = discovery.process.all.targets
+
+    // we only are interested in processes which contain "godot" in the name (hence the keep)
+   	rule {
+   	    source_labels = ["__meta_process_exe"]
+   	    regex = ".*godot.*"
+   	    action = "keep"
+   	}
+}
+
+// configuration of sample rate (default 96) if to high: high cpu usage, if too low: [unknown] labels in short calls
+pyroscope.ebpf "godot_instance" {
+	forward_to = [pyroscope.write.endpoint.receiver]
+	targets = discovery.relabel.godot_process.output
+	sample_rate = 1000 // sample rate is per second
+	demangle = "full" // demangle the cpp call name
+}
+
+// only needed so we can define a service_name. If this block is not set, "undefined" will be the service name
+pyroscope.scrape "local" {
+  forward_to     = [pyroscope.write.endpoint.receiver]
+  targets    = [
+    {"__address__" = "localhost:12345", "service_name"=env("PYROSCOPE_APPLICATION_NAME_NATIVE")},
+  ]
+}
+
+// actually ingest the data to our pyroscope host
+pyroscope.write "endpoint" {
+	endpoint {
+        basic_auth {
+           password = env("PYROSCOPE_BASIC_AUTH_PASSWORD")
+           username = env("PYROSCOPE_BASIC_AUTH_USER")
+        }
+		url = format(
+			"http://%s",
+			env("PYROSCOPE_SERVER_ADDRESS"),
+		)
+	}
+}