Initial profiling support for Iced.

20 files changed, 357 insertions, 35 deletions

diff --git a/Cargo.toml b/Cargo.toml
index 9c45b2f5..2cedb1b6 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -39,6 +39,14 @@ smol = ["iced_futures/smol"]
 palette = ["iced_core/palette"]
 # Enables querying system information
 system = ["iced_winit/system"]
+# Enables tracing with Chrome
+trace_chrome = [
+    "iced_winit/trace",
+    "iced_wgpu?/trace",
+    "iced_glow?/trace",
+    "iced_glutin?/trace",
+    "iced_profiling/tracing-chrome"
+]
 
 [badges]
 maintenance = { status = "actively-developed" }
@@ -51,6 +59,7 @@ members = [
     "glow",
     "glutin",
     "lazy",
+    "profiling",
     "native",
     "style",
     "wgpu",
@@ -66,6 +75,7 @@ iced_graphics = { version = "0.5", path = "graphics" }
 iced_winit = { version = "0.6", path = "winit", features = ["application"] }
 iced_glutin = { version = "0.5", path = "glutin", optional = true }
 iced_glow = { version = "0.5", path = "glow", optional = true }
+iced_profiling = { version = "0.1.0", path = "profiling", optional = true }
 thiserror = "1.0"
 
 [dependencies.image_rs]
diff --git a/docs/images/perfetto.png b/docs/images/perfetto.png
new file mode 100644
index 00000000..93e9df15
--- /dev/null
+++ b/docs/images/perfetto.png
diff --git a/examples/integration_wgpu/Cargo.toml b/examples/integration_wgpu/Cargo.toml
index eaa1df7e..9380f659 100644
--- a/examples/integration_wgpu/Cargo.toml
+++ b/examples/integration_wgpu/Cargo.toml
@@ -8,6 +8,7 @@ publish = false
 [dependencies]
 iced_winit = { path = "../../winit" }
 iced_wgpu = { path = "../../wgpu", features = ["webgl"] }
+iced_profiling = { path = "../../profiling", features = ["tracing-chrome"]}
 env_logger = "0.8"
 
 [target.'cfg(target_arch = "wasm32")'.dependencies]
diff --git a/examples/integration_wgpu/src/main.rs b/examples/integration_wgpu/src/main.rs
index 70f9a48b..e3dfb6fc 100644
--- a/examples/integration_wgpu/src/main.rs
+++ b/examples/integration_wgpu/src/main.rs
@@ -16,6 +16,8 @@ use winit::{
     event_loop::{ControlFlow, EventLoop},
 };
 
+use iced_profiling::info_span;
+
 #[cfg(target_arch = "wasm32")]
 use wasm_bindgen::JsCast;
 #[cfg(target_arch = "wasm32")]
@@ -39,6 +41,9 @@ pub fn main() {
     #[cfg(not(target_arch = "wasm32"))]
     env_logger::init();
 
+    // Initialize tracing
+    let _guard = iced_profiling::init();
+
     // Initialize winit
     let event_loop = EventLoop::new();
 
@@ -198,6 +203,8 @@ pub fn main() {
                 }
             }
             Event::RedrawRequested(_) => {
+                let _ = info_span!("Integration_WGPU", "DRAW").entered();
+
                 if resized {
                     let size = window.inner_size();
 
diff --git a/glow/Cargo.toml b/glow/Cargo.toml
index f586d24d..6c150a74 100644
--- a/glow/Cargo.toml
+++ b/glow/Cargo.toml
@@ -8,6 +8,7 @@ license = "MIT AND OFL-1.1"
 repository = "https://github.com/iced-rs/iced"
 
 [features]
+trace = ["iced_profiling"]
 svg = ["iced_graphics/svg"]
 image = ["iced_graphics/image"]
 png = ["iced_graphics/png"]
@@ -42,6 +43,11 @@ version = "0.5"
 path = "../graphics"
 features = ["font-fallback", "font-icons", "opengl"]
 
+[dependencies.iced_profiling]
+version = "0.1.0"
+path = "../profiling"
+optional = true
+
 [package.metadata.docs.rs]
 rustdoc-args = ["--cfg", "docsrs"]
 all-features = true
diff --git a/glow/src/image.rs b/glow/src/image.rs
index 521a01e7..351b98fa 100644
--- a/glow/src/image.rs
+++ b/glow/src/image.rs
@@ -21,6 +21,9 @@ use glow::HasContext;
 
 use std::cell::RefCell;
 
+#[cfg(feature = "trace")]
+use iced_profiling::info_span;
+
 #[derive(Debug)]
 pub(crate) struct Pipeline {
     program: <glow::Context as HasContext>::Program,
@@ -148,6 +151,9 @@ impl Pipeline {
         images: &[layer::Image],
         layer_bounds: Rectangle<u32>,
     ) {
+        #[cfg(feature = "trace")]
+        let _ = info_span!("Glow::Image", "DRAW").entered();
+
         unsafe {
             gl.use_program(Some(self.program));
             gl.bind_vertex_array(Some(self.vertex_array));
diff --git a/glow/src/quad.rs b/glow/src/quad.rs
index d9f1c6ae..fc918bf2 100644
--- a/glow/src/quad.rs
+++ b/glow/src/quad.rs
@@ -7,6 +7,9 @@ use glow::HasContext;
 use iced_graphics::layer;
 use iced_native::Rectangle;
 
+#[cfg(feature = "trace")]
+use iced_profiling::info_span;
+
 #[derive(Debug)]
 pub enum Pipeline {
     Core(core::Pipeline),
@@ -42,6 +45,9 @@ impl Pipeline {
         scale: f32,
         bounds: Rectangle<u32>,
     ) {
+        #[cfg(feature = "trace")]
+        let _ = info_span!("Glow::Quad", "DRAW").enter();
+
         match self {
             Pipeline::Core(pipeline) => {
                 pipeline.draw(
diff --git a/glow/src/triangle.rs b/glow/src/triangle.rs
index d0205e08..11d24349 100644
--- a/glow/src/triangle.rs
+++ b/glow/src/triangle.rs
@@ -9,6 +9,9 @@ use iced_graphics::triangle::{ColoredVertex2D, Vertex2D};
 use glow::HasContext;
 use std::marker::PhantomData;
 
+#[cfg(feature = "trace")]
+use iced_profiling::info_span;
+
 const DEFAULT_VERTICES: usize = 1_000;
 const DEFAULT_INDICES: usize = 1_000;
 
@@ -58,6 +61,9 @@ impl Pipeline {
         transformation: Transformation,
         scale_factor: f32,
     ) {
+        #[cfg(feature = "trace")]
+        let _ = info_span!("Glow::Triangle", "DRAW").enter();
+
         unsafe {
             gl.enable(glow::MULTISAMPLE);
             gl.enable(glow::SCISSOR_TEST);
diff --git a/glutin/Cargo.toml b/glutin/Cargo.toml
index 022457b1..6749cb96 100644
--- a/glutin/Cargo.toml
+++ b/glutin/Cargo.toml
@@ -11,6 +11,7 @@ keywords = ["gui", "ui", "graphics", "interface", "widgets"]
 categories = ["gui"]
 
 [features]
+trace = ["iced_profiling/tracing-chrome"]
 debug = ["iced_winit/debug"]
 system = ["iced_winit/system"]
 
@@ -35,3 +36,8 @@ features = ["application"]
 version = "0.5"
 path = "../graphics"
 features = ["opengl"]
+
+[dependencies.iced_profiling]
+version = "0.1.0"
+path = "../profiling"
+optional = true
diff --git a/glutin/src/application.rs b/glutin/src/application.rs
index 3e9d11f9..21051f16 100644
--- a/glutin/src/application.rs
+++ b/glutin/src/application.rs
@@ -17,6 +17,9 @@ use iced_winit::{Clipboard, Command, Debug, Proxy, Settings};
 use glutin::window::Window;
 use std::mem::ManuallyDrop;
 
+#[cfg(feature = "trace")]
+use iced_profiling::{info_span, instrument::Instrument};
+
 /// Runs an [`Application`] with an executor, compositor, and the provided
 /// settings.
 pub fn run<A, E, C>(
@@ -35,9 +38,15 @@ where
     use glutin::platform::run_return::EventLoopExtRunReturn;
     use glutin::ContextBuilder;
 
+    #[cfg(feature = "trace")]
+    let _guard = iced_profiling::init();
+
     let mut debug = Debug::new();
     debug.startup_started();
 
+    #[cfg(feature = "trace")]
+    let _ = info_span!("Application::Glutin", "RUN").entered();
+
     let mut event_loop = EventLoopBuilder::with_user_event().build();
     let proxy = event_loop.create_proxy();
 
@@ -124,18 +133,26 @@ where
 
     let (mut sender, receiver) = mpsc::unbounded();
 
-    let mut instance = Box::pin(run_instance::<A, E, C>(
-        application,
-        compositor,
-        renderer,
-        runtime,
-        proxy,
-        debug,
-        receiver,
-        context,
-        init_command,
-        settings.exit_on_close_request,
-    ));
+    let mut instance = Box::pin({
+        let run_instance = run_instance::<A, E, C>(
+            application,
+            compositor,
+            renderer,
+            runtime,
+            proxy,
+            debug,
+            receiver,
+            context,
+            init_command,
+            settings.exit_on_close_request,
+        );
+
+        #[cfg(feature = "trace")]
+        let run_instance =
+            run_instance.instrument(info_span!("Application", "LOOP"));
+
+        run_instance
+    });
 
     let mut context = task::Context::from_waker(task::noop_waker_ref());
 
@@ -333,6 +350,9 @@ async fn run_instance<A, E, C>(
                 messages.push(message);
             }
             event::Event::RedrawRequested(_) => {
+                #[cfg(feature = "trace")]
+                let _ = info_span!("Application", "FRAME").entered();
+
                 debug.render_started();
 
                 #[allow(unsafe_code)]
diff --git a/profiling/Cargo.toml b/profiling/Cargo.toml
new file mode 100644
index 00000000..29ee8c9c
--- /dev/null
+++ b/profiling/Cargo.toml
@@ -0,0 +1,15 @@
+[package]
+name = "iced_profiling"
+authors = ["Bingus <shankern@protonmail.com>"]
+version = "0.1.0"
+edition = "2021"
+description = "Profiling backend implementations for Iced"
+
+[dependencies]
+tracing = { version = "0.1.37", default-features = false, features = ["std"] }
+tracing-core = "0.1.30"
+tracing-subscriber = { version = "0.3.16", features = ["registry", "env-filter"] }
+
+[dependencies.tracing-chrome]
+version = "0.7.0"
+optional = true
diff --git a/profiling/README.md b/profiling/README.md
new file mode 100644
index 00000000..f150bcec
--- /dev/null
+++ b/profiling/README.md
@@ -0,0 +1,61 @@
+# `iced_profiling`
+[![Documentation](https://docs.rs/iced_profiling/badge.svg)]
+[![Crates.io](https://img.shields.io/crates/v/iced_profiling.svg)](https://crates.io/crates/iced_profiling)
+[![License](https://img.shields.io/crates/l/iced_profiling.svg)](https://github.com/iced-rs/iced/blob/master/LICENSE)
+[![Discord Server](https://img.shields.io/discord/628993209984614400?label=&labelColor=6A7EC2&logo=discord&logoColor=ffffff&color=7389D8)](https://discord.gg/3xZJ65GAhd)
+
+`iced_profiling` is a crate which implements various tracing backends for Iced.
+
+It relies on the [tracing](https://crates.io/crates/tracing) crate to collect diagnostics. We currently only support 
+tracing with `tracing`'s `info_span!` macro, but will consider different logging levels in the future. PRs welcome!
+
+## Trace backends
+
+We currently support only Chrome JSON traces using the [tracing-chrome](https://crates.io/crates/tracing-chrome) crate.
+
+There are plans to add support for [Tracy](https://github.com/wolfpld/tracy) in the near future!
+
+## Generating a trace file
+
+### Using Iced's `Application`
+
+Simply enable your tracing backend of choice (e.g. `trace_chrome`) feature in Iced & run your project.
+
+```shell
+cargo run --features iced/trace_chrome
+```
+### Standalone dependency
+
+You can enable tracing by enabling your tracing backend of choice as a feature of `iced_profiling`.
+
+```toml
+iced_profiling = { version = "0.1.0", features = ["tracing-chrome"]}
+```
+
+Doing so will require you to initialize the profiler manually like so:
+
+```rust
+let _guard = iced_profiling::init();
+```
+
+This reference must be kept alive for the entire duration of your application that you wish to profile.
+
+## Chrome
+
+By default, Chrome trace files will be generated in the current working directory:
+```shell
+path/to/your/project/project_trace_{timestamp}.json
+```
+
+You also set a specific path by setting the `CHROME_TRACE_FILE` env variable:
+```shell
+CHROME_TRACE_FILE = ~/Desktop/trace.json cargo run
+```
+
+If you cannot find your trace file, there may have been a permission issue when trying to generate your file. Be sure to check your cargo manifest directory!
+
+Once your file is generated, you can view it in Google Chrome at either [ui.perfetto.dev](ui.perfetto.dev) (new) or [chrome://trace](chrome://trace) (old).
+
+<p align="center">
+  <img alt="The native target" src="../docs/images/perfetto.png" width="80%">
+</p>
\ No newline at end of file
diff --git a/profiling/src/lib.rs b/profiling/src/lib.rs
new file mode 100644
index 00000000..8fc58fb8
--- /dev/null
+++ b/profiling/src/lib.rs
@@ -0,0 +1,100 @@
+use std::time::Duration;
+use tracing_subscriber::prelude::*;
+use tracing_subscriber::Registry;
+
+#[cfg(feature = "tracing-chrome")]
+use {
+    tracing_chrome::FlushGuard,
+    tracing_subscriber::fmt::{format::DefaultFields, FormattedFields},
+};
+
+pub use tracing::{info_span, instrument};
+
+/// Profiler state. This will likely need to be updated or reworked when adding new tracing backends.
+pub struct Profiler {
+    #[cfg(feature = "tracing-chrome")]
+    /// [`FlushGuard`] must not be dropped until the application scope is dropped for accurate tracing.
+    _guard: FlushGuard,
+}
+
+pub fn init() -> Profiler {
+    // Registry stores the spans & generates unique span IDs
+    let subscriber = Registry::default();
+
+    #[cfg(feature = "tracing-chrome")]
+    let (chrome_layer, guard) = {
+        let mut layer = tracing_chrome::ChromeLayerBuilder::new();
+
+        // Optional configurable env var: CHROME_TRACE_FILE=/path/to/trace_file/file.json,
+        // for uploading to chrome://tracing (old) or ui.perfetto.dev (new).
+        if let Ok(path) = std::env::var("CHROME_TRACE_FILE") {
+            layer = layer.file(path);
+        } else if let Ok(current_dir) = std::env::current_dir() {
+            let time = std::time::SystemTime::now()
+                .duration_since(std::time::UNIX_EPOCH)
+                .unwrap_or(Duration::from_millis(0))
+                .as_millis();
+
+            let trace_file_name = current_dir
+                .file_name()
+                .map(|file_dir| {
+                    format!(
+                        "{}_trace_{}.json",
+                        file_dir.to_str().unwrap_or("trace"),
+                        time
+                    )
+                })
+                .unwrap_or_else(|| "trace.json".to_string());
+
+            let path = format!(
+                "{}/{}",
+                current_dir.to_str().expect("Invalid path"),
+                trace_file_name
+            );
+
+            layer = layer.file(path);
+        } else {
+            layer = layer.file(env!("CARGO_MANIFEST_DIR"))
+        }
+
+        let (chrome_layer, guard) = layer
+            .name_fn(Box::new(|event_or_span| match event_or_span {
+                tracing_chrome::EventOrSpan::Event(event) => {
+                    event.metadata().name().into()
+                }
+                tracing_chrome::EventOrSpan::Span(span) => {
+                    if let Some(fields) = span
+                        .extensions()
+                        .get::<FormattedFields<DefaultFields>>()
+                    {
+                        format!(
+                            "{}: {}",
+                            span.metadata().name(),
+                            fields.fields.as_str()
+                        )
+                    } else {
+                        span.metadata().name().into()
+                    }
+                }
+            }))
+            .build();
+
+        (chrome_layer, guard)
+    };
+
+    let fmt_layer = tracing_subscriber::fmt::Layer::default();
+    let subscriber = subscriber.with(fmt_layer);
+
+    #[cfg(feature = "tracing-chrome")]
+    let subscriber = subscriber.with(chrome_layer);
+
+    // create dispatcher which will forward span events to the subscriber
+    // this can only be set once or will panic
+    tracing::subscriber::set_global_default(subscriber)
+        .expect("Profiler could not set the global default subscriber.");
+
+    Profiler {
+        #[cfg(feature = "tracing-chrome")]
+        _guard: guard,
+    }
+}
diff --git a/wgpu/Cargo.toml b/wgpu/Cargo.toml
index a40d9967..ca89cc26 100644
--- a/wgpu/Cargo.toml
+++ b/wgpu/Cargo.toml
@@ -8,24 +8,25 @@ license = "MIT AND OFL-1.1"
 repository = "https://github.com/iced-rs/iced"
 
 [features]
-svg = ["iced_graphics/svg"]
+bmp = ["iced_graphics/bmp"]
+canvas = ["iced_graphics/canvas"]
+dds = ["iced_graphics/dds"]
+default_system_font = ["iced_graphics/font-source"]
+farbfeld = ["iced_graphics/farbfeld"]
+gif = ["iced_graphics/gif"]
+hdr = ["iced_graphics/hdr"]
+ico = ["iced_graphics/ico"]
 image = ["iced_graphics/image"]
-png = ["iced_graphics/png"]
 jpeg = ["iced_graphics/jpeg"]
 jpeg_rayon = ["iced_graphics/jpeg_rayon"]
-gif = ["iced_graphics/gif"]
-webp = ["iced_graphics/webp"]
+png = ["iced_graphics/png"]
 pnm = ["iced_graphics/pnm"]
-ico = ["iced_graphics/ico"]
-bmp = ["iced_graphics/bmp"]
-hdr = ["iced_graphics/hdr"]
-dds = ["iced_graphics/dds"]
-farbfeld = ["iced_graphics/farbfeld"]
-canvas = ["iced_graphics/canvas"]
 qr_code = ["iced_graphics/qr_code"]
-default_system_font = ["iced_graphics/font-source"]
 spirv = ["wgpu/spirv"]
+svg = ["iced_graphics/svg"]
+trace = ["iced_profiling"]
 webgl = ["wgpu/webgl"]
+webp = ["iced_graphics/webp"]
 
 [dependencies]
 wgpu = "0.14"
@@ -50,6 +51,11 @@ version = "0.5"
 path = "../graphics"
 features = ["font-fallback", "font-icons"]
 
+[dependencies.iced_profiling]
+version = "0.1.0"
+path = "../profiling"
+optional = true
+
 [dependencies.encase]
 version = "0.3.0"
 features = ["glam"]
diff --git a/wgpu/src/backend.rs b/wgpu/src/backend.rs
index 946eb712..dda9aee1 100644
--- a/wgpu/src/backend.rs
+++ b/wgpu/src/backend.rs
@@ -10,6 +10,9 @@ use iced_graphics::{Primitive, Viewport};
 use iced_native::alignment;
 use iced_native::{Font, Size};
 
+#[cfg(feature = "trace")]
+use iced_profiling::info_span;
+
 #[cfg(any(feature = "image", feature = "svg"))]
 use crate::image;
 
@@ -77,6 +80,8 @@ impl Backend {
         overlay_text: &[T],
     ) {
         log::debug!("Drawing");
+        #[cfg(feature = "trace")]
+        let _ = info_span!("Wgpu::Backend", "PRESENT").entered();
 
         let target_size = viewport.physical_size();
         let scale_factor = viewport.scale_factor() as f32;
diff --git a/wgpu/src/image.rs b/wgpu/src/image.rs
index 390bad90..ed81e0c6 100644
--- a/wgpu/src/image.rs
+++ b/wgpu/src/image.rs
@@ -23,6 +23,9 @@ use iced_native::image;
 #[cfg(feature = "svg")]
 use iced_native::svg;
 
+#[cfg(feature = "trace")]
+use iced_profiling::info_span;
+
 #[derive(Debug)]
 pub struct Pipeline {
     #[cfg(feature = "image")]
@@ -289,6 +292,9 @@ impl Pipeline {
         target: &wgpu::TextureView,
         _scale: f32,
     ) {
+        #[cfg(feature = "trace")]
+        let _ = info_span!("Wgpu::Image", "DRAW").entered();
+
         let instances: &mut Vec<Instance> = &mut Vec::new();
 
         #[cfg(feature = "image")]
diff --git a/wgpu/src/quad.rs b/wgpu/src/quad.rs
index 027a34be..702122e1 100644
--- a/wgpu/src/quad.rs
+++ b/wgpu/src/quad.rs
@@ -6,6 +6,9 @@ use bytemuck::{Pod, Zeroable};
 use std::mem;
 use wgpu::util::DeviceExt;
 
+#[cfg(feature = "trace")]
+use iced_profiling::info_span;
+
 #[derive(Debug)]
 pub struct Pipeline {
     pipeline: wgpu::RenderPipeline,
@@ -173,6 +176,9 @@ impl Pipeline {
         bounds: Rectangle<u32>,
         target: &wgpu::TextureView,
     ) {
+        #[cfg(feature = "trace")]
+        let _ = info_span!("Wgpu::Quad", "DRAW").entered();
+
         let uniforms = Uniforms::new(transformation, scale);
 
         {
@@ -207,6 +213,9 @@ impl Pipeline {
 
             instance_buffer.copy_from_slice(instance_bytes);
 
+            #[cfg(feature = "trace")]
+            let _ = info_span!("Wgpu::Quad", "BEGIN_RENDER_PASS").enter();
+
             {
                 let mut render_pass =
                     encoder.begin_render_pass(&wgpu::RenderPassDescriptor {
diff --git a/wgpu/src/triangle.rs b/wgpu/src/triangle.rs
index 061154b6..b7c63167 100644
--- a/wgpu/src/triangle.rs
+++ b/wgpu/src/triangle.rs
@@ -8,6 +8,8 @@ use crate::Transformation;
 use iced_graphics::layer::mesh::{self, Mesh};
 use iced_graphics::triangle::ColoredVertex2D;
 use iced_graphics::Size;
+#[cfg(feature = "trace")]
+use iced_profiling::info_span;
 
 #[derive(Debug)]
 pub struct Pipeline {
@@ -53,6 +55,9 @@ impl Pipeline {
         scale_factor: f32,
         meshes: &[Mesh<'_>],
     ) {
+        #[cfg(feature = "trace")]
+        let _ = info_span!("Wgpu::Triangle", "DRAW").entered();
+
         // Count the total amount of vertices & indices we need to handle
         let count = mesh::attribute_count_of(meshes);
 
@@ -247,6 +252,9 @@ impl Pipeline {
                 (target, None, wgpu::LoadOp::Load)
             };
 
+            #[cfg(feature = "trace")]
+            let _ = info_span!("Wgpu::Triangle", "BEGIN_RENDER_PASS").enter();
+
             let mut render_pass =
                 encoder.begin_render_pass(&wgpu::RenderPassDescriptor {
                     label: Some("iced_wgpu::triangle render pass"),
diff --git a/winit/Cargo.toml b/winit/Cargo.toml
index ebbadb12..22b40f70 100644
--- a/winit/Cargo.toml
+++ b/winit/Cargo.toml
@@ -11,6 +11,7 @@ keywords = ["gui", "ui", "graphics", "interface", "widgets"]
 categories = ["gui"]
 
 [features]
+trace = ["iced_profiling"]
 debug = ["iced_native/debug"]
 system = ["sysinfo"]
 application = []
@@ -37,6 +38,11 @@ path = "../graphics"
 version = "0.5"
 path = "../futures"
 
+[dependencies.iced_profiling]
+version = "0.1.0"
+path = "../profiling"
+optional = true
+
 [target.'cfg(target_os = "windows")'.dependencies.winapi]
 version = "0.3.6"
 
diff --git a/winit/src/application.rs b/winit/src/application.rs
index 1973fdce..fc73db89 100644
--- a/winit/src/application.rs
+++ b/winit/src/application.rs
@@ -24,6 +24,9 @@ pub use iced_native::application::{Appearance, StyleSheet};
 
 use std::mem::ManuallyDrop;
 
+#[cfg(feature = "trace")]
+use iced_profiling::{info_span, instrument::Instrument};
+
 /// An interactive, native cross-platform application.
 ///
 /// This trait is the main entrypoint of Iced. Once implemented, you can run
@@ -111,9 +114,15 @@ where
     use futures::Future;
     use winit::event_loop::EventLoopBuilder;
 
+    #[cfg(feature = "trace")]
+    let _guard = iced_profiling::init();
+
     let mut debug = Debug::new();
     debug.startup_started();
 
+    #[cfg(feature = "trace")]
+    let _ = info_span!("Application", "RUN").entered();
+
     let event_loop = EventLoopBuilder::with_user_event().build();
     let proxy = event_loop.create_proxy();
 
@@ -175,18 +184,26 @@ where
 
     let (mut sender, receiver) = mpsc::unbounded();
 
-    let mut instance = Box::pin(run_instance::<A, E, C>(
-        application,
-        compositor,
-        renderer,
-        runtime,
-        proxy,
-        debug,
-        receiver,
-        init_command,
-        window,
-        settings.exit_on_close_request,
-    ));
+    let mut instance = Box::pin({
+        let run_instance = run_instance::<A, E, C>(
+            application,
+            compositor,
+            renderer,
+            runtime,
+            proxy,
+            debug,
+            receiver,
+            init_command,
+            window,
+            settings.exit_on_close_request,
+        );
+
+        #[cfg(feature = "trace")]
+        let run_instance =
+            run_instance.instrument(info_span!("Application", "LOOP"));
+
+        run_instance
+    });
 
     let mut context = task::Context::from_waker(task::noop_waker_ref());
 
@@ -391,6 +408,9 @@ async fn run_instance<A, E, C>(
                 messages.push(message);
             }
             event::Event::RedrawRequested(_) => {
+                #[cfg(feature = "trace")]
+                let _ = info_span!("Application", "FRAME").entered();
+
                 let physical_size = state.physical_size();
 
                 if physical_size.width == 0 || physical_size.height == 0 {
@@ -529,12 +549,24 @@ pub fn build_user_interface<'a, A: Application>(
 where
     <A::Renderer as crate::Renderer>::Theme: StyleSheet,
 {
+    #[cfg(feature = "trace")]
+    let view_span = info_span!("Application", "VIEW").entered();
+
     debug.view_started();
     let view = application.view();
+
+    #[cfg(feature = "trace")]
+    let _ = view_span.exit();
     debug.view_finished();
 
+    #[cfg(feature = "trace")]
+    let layout_span = info_span!("Application", "LAYOUT").entered();
+
     debug.layout_started();
     let user_interface = UserInterface::build(view, size, cache, renderer);
+
+    #[cfg(feature = "trace")]
+    let _ = layout_span.exit();
     debug.layout_finished();
 
     user_interface
@@ -559,10 +591,16 @@ pub fn update<A: Application, E: Executor>(
     <A::Renderer as crate::Renderer>::Theme: StyleSheet,
 {
     for message in messages.drain(..) {
+        #[cfg(feature = "trace")]
+        let update_span = info_span!("Application", "UPDATE").entered();
+
         debug.log_message(&message);
 
         debug.update_started();
         let command = runtime.enter(|| application.update(message));
+
+        #[cfg(feature = "trace")]
+        let _ = update_span.exit();
         debug.update_finished();
 
         run_command(