auto merge of #5335 : nnethercote/servo/profile-crate, r=glennw

- Most of util::memory has been moved into profile::mem, though the
  `SizeOf` trait and related things remain in util::memory. The
  `SystemMemoryReporter` code is now in a submodule
  profile::mem::system_reporter.

- util::time has been moved entirely into profile::time.

36 files changed, 850 insertions, 726 deletions

diff --git a/components/compositing/Cargo.toml b/components/compositing/Cargo.toml
index dbbc9f4f7f8..a24069ab946 100644
--- a/components/compositing/Cargo.toml
+++ b/components/compositing/Cargo.toml
@@ -22,6 +22,9 @@ path = "../msg"
 [dependencies.net]
 path = "../net"
 
+[dependencies.profile]
+path = "../profile"
+
 [dependencies.util]
 path = "../util"
 
@@ -52,4 +55,4 @@ git = "https://github.com/servo/gleam"
 [dependencies]
 url = "0.2.16"
 time = "0.1.17"
-libc = "*"
\ No newline at end of file
+libc = "*"
diff --git a/components/compositing/compositor.rs b/components/compositing/compositor.rs
index e865c61be49..8a80947f1cf 100644
--- a/components/compositing/compositor.rs
+++ b/components/compositing/compositor.rs
@@ -11,8 +11,6 @@ use scrolling::ScrollingTimerProxy;
 use windowing;
 use windowing::{MouseWindowEvent, WindowEvent, WindowMethods, WindowNavigateMsg};
 
-use std::cmp;
-use std::mem;
 use geom::point::{Point2D, TypedPoint2D};
 use geom::rect::{Rect, TypedRect};
 use geom::size::{Size2D, TypedSize2D};
@@ -35,20 +33,23 @@ use msg::constellation_msg::{ConstellationChan, NavigationDirection};
 use msg::constellation_msg::Msg as ConstellationMsg;
 use msg::constellation_msg::{Key, KeyModifiers, KeyState, LoadData};
 use msg::constellation_msg::{PipelineId, WindowSizeData};
-use util::geometry::{PagePx, ScreenPx, ViewportPx};
-use util::memory::MemoryProfilerChan;
-use util::opts;
-use util::time::{TimeProfilerCategory, profile, TimeProfilerChan};
-use util::{memory, time};
+use profile::mem;
+use profile::mem::{MemoryProfilerChan};
+use profile::time;
+use profile::time::{TimeProfilerCategory, profile, TimeProfilerChan};
+use std::cmp;
 use std::collections::HashMap;
 use std::collections::hash_map::Entry::{Occupied, Vacant};
 use std::old_path::Path;
+use std::mem::replace;
 use std::num::Float;
 use std::rc::Rc;
 use std::slice::bytes::copy_memory;
 use std::sync::mpsc::Sender;
 use time::{precise_time_ns, precise_time_s};
 use url::Url;
+use util::geometry::{PagePx, ScreenPx, ViewportPx};
+use util::opts;
 
 /// NB: Never block on the constellation, because sometimes the constellation blocks on us.
 pub struct IOCompositor<Window: WindowMethods> {
@@ -869,7 +870,7 @@ impl<Window: WindowMethods> IOCompositor<Window> {
 
     fn process_pending_scroll_events(&mut self) {
         let had_scroll_events = self.pending_scroll_events.len() > 0;
-        for scroll_event in mem::replace(&mut self.pending_scroll_events, Vec::new()).into_iter() {
+        for scroll_event in replace(&mut self.pending_scroll_events, Vec::new()).into_iter() {
             let delta = scroll_event.delta / self.scene.scale;
             let cursor = scroll_event.cursor.as_f32() / self.scene.scale;
 
@@ -1356,7 +1357,7 @@ impl<Window> CompositorEventListener for IOCompositor<Window> where Window: Wind
 
         // Tell the profiler, memory profiler, and scrolling timer to shut down.
         self.time_profiler_chan.send(time::TimeProfilerMsg::Exit);
-        self.memory_profiler_chan.send(memory::MemoryProfilerMsg::Exit);
+        self.memory_profiler_chan.send(mem::MemoryProfilerMsg::Exit);
         self.scrolling_timer.shutdown();
     }
 
diff --git a/components/compositing/compositor_task.rs b/components/compositing/compositor_task.rs
index 3c615175c32..a9b4fb68475 100644
--- a/components/compositing/compositor_task.rs
+++ b/components/compositing/compositor_task.rs
@@ -21,13 +21,13 @@ use msg::compositor_msg::{Epoch, LayerId, LayerMetadata, ReadyState};
 use msg::compositor_msg::{PaintListener, PaintState, ScriptListener, ScrollPolicy};
 use msg::constellation_msg::{ConstellationChan, PipelineId};
 use msg::constellation_msg::{Key, KeyState, KeyModifiers};
-use url::Url;
-use util::cursor::Cursor;
-use util::memory::MemoryProfilerChan;
-use util::time::TimeProfilerChan;
+use profile::mem::MemoryProfilerChan;
+use profile::time::TimeProfilerChan;
 use std::sync::mpsc::{channel, Sender, Receiver};
 use std::fmt::{Error, Formatter, Debug};
 use std::rc::Rc;
+use url::Url;
+use util::cursor::Cursor;
 
 /// Sends messages to the compositor. This is a trait supplied by the port because the method used
 /// to communicate with the compositor may have to kick OS event loops awake, communicate cross-
diff --git a/components/compositing/constellation.rs b/components/compositing/constellation.rs
index f822a9e19a5..228211e3ef8 100644
--- a/components/compositing/constellation.rs
+++ b/components/compositing/constellation.rs
@@ -25,12 +25,12 @@ use msg::constellation_msg::Msg as ConstellationMsg;
 use net::image_cache_task::{ImageCacheTask, ImageCacheTaskClient};
 use net::resource_task::{self, ResourceTask};
 use net::storage_task::{StorageTask, StorageTaskMsg};
+use profile::mem::MemoryProfilerChan;
+use profile::time::TimeProfilerChan;
 use util::cursor::Cursor;
 use util::geometry::PagePx;
-use util::memory::MemoryProfilerChan;
 use util::opts;
 use util::task::spawn_named;
-use util::time::TimeProfilerChan;
 use std::borrow::ToOwned;
 use std::collections::HashMap;
 use std::old_io as io;
diff --git a/components/compositing/headless.rs b/components/compositing/headless.rs
index 18cf76961a7..3f38099d83b 100644
--- a/components/compositing/headless.rs
+++ b/components/compositing/headless.rs
@@ -9,10 +9,10 @@ use geom::scale_factor::ScaleFactor;
 use geom::size::TypedSize2D;
 use msg::constellation_msg::Msg as ConstellationMsg;
 use msg::constellation_msg::{ConstellationChan, WindowSizeData};
-use util::memory::MemoryProfilerChan;
-use util::memory;
-use util::time::TimeProfilerChan;
-use util::time;
+use profile::mem;
+use profile::mem::MemoryProfilerChan;
+use profile::time;
+use profile::time::TimeProfilerChan;
 
 /// Starts the compositor, which listens for messages on the specified port.
 ///
@@ -121,7 +121,7 @@ impl CompositorEventListener for NullCompositor {
         while self.port.try_recv_compositor_msg().is_some() {}
 
         self.time_profiler_chan.send(time::TimeProfilerMsg::Exit);
-        self.memory_profiler_chan.send(memory::MemoryProfilerMsg::Exit);
+        self.memory_profiler_chan.send(mem::MemoryProfilerMsg::Exit);
     }
 
     fn pinch_zoom_level(&self) -> f32 {
diff --git a/components/compositing/lib.rs b/components/compositing/lib.rs
index 77c389d8607..6ab2e313437 100644
--- a/components/compositing/lib.rs
+++ b/components/compositing/lib.rs
@@ -23,6 +23,7 @@ extern crate png;
 extern crate script_traits;
 extern crate msg;
 extern crate net;
+extern crate profile;
 #[macro_use]
 extern crate util;
 extern crate gleam;
diff --git a/components/compositing/pipeline.rs b/components/compositing/pipeline.rs
index 52771c75bcf..0d8e6261d25 100644
--- a/components/compositing/pipeline.rs
+++ b/components/compositing/pipeline.rs
@@ -19,11 +19,11 @@ use msg::constellation_msg::{LoadData, WindowSizeData, PipelineExitType};
 use net::image_cache_task::ImageCacheTask;
 use net::resource_task::ResourceTask;
 use net::storage_task::StorageTask;
+use profile::mem::MemoryProfilerChan;
+use profile::time::TimeProfilerChan;
+use std::sync::mpsc::{Receiver, channel};
 use url::Url;
 use util::geometry::{PagePx, ViewportPx};
-use util::memory::MemoryProfilerChan;
-use util::time::TimeProfilerChan;
-use std::sync::mpsc::{Receiver, channel};
 
 /// A uniquely-identifiable pipeline of script task, layout task, and paint task.
 pub struct Pipeline {
diff --git a/components/gfx/Cargo.toml b/components/gfx/Cargo.toml
index ee9d4990da9..bb213624240 100644
--- a/components/gfx/Cargo.toml
+++ b/components/gfx/Cargo.toml
@@ -20,6 +20,9 @@ path = "../util"
 [dependencies.msg]
 path = "../msg"
 
+[dependencies.profile]
+path = "../profile"
+
 [dependencies.style]
 path = "../style"
 
diff --git a/components/gfx/lib.rs b/components/gfx/lib.rs
index a2cb03d33a6..0be282fb8f6 100644
--- a/components/gfx/lib.rs
+++ b/components/gfx/lib.rs
@@ -27,6 +27,7 @@ extern crate layers;
 extern crate libc;
 extern crate stb_image;
 extern crate png;
+extern crate profile;
 extern crate script_traits;
 extern crate "rustc-serialize" as rustc_serialize;
 extern crate unicode;
diff --git a/components/gfx/paint_task.rs b/components/gfx/paint_task.rs
index db281e1acac..8548161d165 100644
--- a/components/gfx/paint_task.rs
+++ b/components/gfx/paint_task.rs
@@ -25,17 +25,17 @@ use msg::compositor_msg::{LayerMetadata, PaintListener, ScrollPolicy};
 use msg::constellation_msg::Msg as ConstellationMsg;
 use msg::constellation_msg::{ConstellationChan, Failure, PipelineId};
 use msg::constellation_msg::PipelineExitType;
+use profile::time::{TimeProfilerChan, TimeProfilerCategory, profile};
 use skia::SkiaGrGLNativeContextRef;
+use std::mem;
+use std::thread::Builder;
+use std::sync::Arc;
+use std::sync::mpsc::{Receiver, Sender, channel};
 use util::geometry::{Au, ZERO_POINT};
 use util::opts;
 use util::smallvec::SmallVec;
 use util::task::spawn_named_with_send_on_failure;
 use util::task_state;
-use util::time::{TimeProfilerChan, TimeProfilerCategory, profile};
-use std::mem;
-use std::thread::Builder;
-use std::sync::Arc;
-use std::sync::mpsc::{Receiver, Sender, channel};
 
 /// Information about a hardware graphics layer that layout sends to the painting task.
 #[derive(Clone)]
diff --git a/components/layout/Cargo.toml b/components/layout/Cargo.toml
index 733985cefde..2eee5eb3d4a 100644
--- a/components/layout/Cargo.toml
+++ b/components/layout/Cargo.toml
@@ -37,6 +37,9 @@ path = "../plugins"
 [dependencies.net]
 path = "../net"
 
+[dependencies.profile]
+path = "../profile"
+
 [dependencies.util]
 path = "../util"
 
diff --git a/components/layout/layout_task.rs b/components/layout/layout_task.rs
index 08658f05d03..2c15e643b9c 100644
--- a/components/layout/layout_task.rs
+++ b/components/layout/layout_task.rs
@@ -43,6 +43,9 @@ use msg::constellation_msg::{ConstellationChan, Failure, PipelineExitType, Pipel
 use net::image_cache_task::{ImageCacheTask, ImageResponseMsg};
 use net::local_image_cache::{ImageResponder, LocalImageCache};
 use net::resource_task::{ResourceTask, load_bytes_iter};
+use profile::mem::{MemoryProfilerChan, MemoryProfilerMsg, MemoryReport, MemoryReportsChan};
+use profile::time::{TimeProfilerCategory, ProfilerMetadata, TimeProfilerChan};
+use profile::time::{TimerMetadataFrameType, TimerMetadataReflowType, profile};
 use script::dom::bindings::js::LayoutJS;
 use script::dom::element::ElementTypeId;
 use script::dom::htmlelement::HTMLElementTypeId;
@@ -70,14 +73,11 @@ use url::Url;
 use util::cursor::Cursor;
 use util::geometry::Au;
 use util::logical_geometry::LogicalPoint;
-use util::memory::{MemoryProfilerChan, MemoryProfilerMsg, MemoryReport, MemoryReportsChan};
 use util::memory::{SizeOf};
 use util::opts;
 use util::smallvec::{SmallVec, SmallVec1, VecLike};
 use util::task::spawn_named_with_send_on_failure;
 use util::task_state;
-use util::time::{TimeProfilerCategory, ProfilerMetadata, TimeProfilerChan};
-use util::time::{TimerMetadataFrameType, TimerMetadataReflowType, profile};
 use util::workqueue::WorkQueue;
 
 /// Mutable data belonging to the LayoutTask.
diff --git a/components/layout/lib.rs b/components/layout/lib.rs
index 2ff8502f7f1..a0498e2464f 100644
--- a/components/layout/lib.rs
+++ b/components/layout/lib.rs
@@ -43,6 +43,8 @@ extern crate style;
 extern crate "plugins" as servo_plugins;
 extern crate net;
 extern crate msg;
+#[macro_use]
+extern crate profile;
 extern crate selectors;
 #[macro_use]
 extern crate util;
diff --git a/components/layout/parallel.rs b/components/layout/parallel.rs
index 5562db5e10d..e0effe6e6fc 100644
--- a/components/layout/parallel.rs
+++ b/components/layout/parallel.rs
@@ -20,12 +20,12 @@ use wrapper::{layout_node_to_unsafe_layout_node, layout_node_from_unsafe_layout_
 use wrapper::{PostorderNodeMutTraversal, UnsafeLayoutNode};
 use wrapper::{PreorderDomTraversal, PostorderDomTraversal};
 
-use util::opts;
-use util::time::{TimeProfilerCategory, ProfilerMetadata, TimeProfilerChan, profile};
-use util::workqueue::{WorkQueue, WorkUnit, WorkerProxy};
+use profile::time::{TimeProfilerCategory, ProfilerMetadata, TimeProfilerChan, profile};
 use std::mem;
 use std::ptr;
 use std::sync::atomic::{AtomicIsize, Ordering};
+use util::opts;
+use util::workqueue::{WorkQueue, WorkUnit, WorkerProxy};
 
 #[allow(dead_code)]
 fn static_assertion(node: UnsafeLayoutNode) {
diff --git a/components/layout_traits/Cargo.toml b/components/layout_traits/Cargo.toml
index 4922db6639b..c099a8b3541 100644
--- a/components/layout_traits/Cargo.toml
+++ b/components/layout_traits/Cargo.toml
@@ -19,6 +19,9 @@ path = "../msg"
 [dependencies.net]
 path = "../net"
 
+[dependencies.profile]
+path = "../profile"
+
 [dependencies.util]
 path = "../util"
 
diff --git a/components/layout_traits/lib.rs b/components/layout_traits/lib.rs
index 66d0ccc624c..f8b9c3f263f 100644
--- a/components/layout_traits/lib.rs
+++ b/components/layout_traits/lib.rs
@@ -6,6 +6,7 @@ extern crate gfx;
 extern crate script_traits;
 extern crate msg;
 extern crate net;
+extern crate profile;
 extern crate url;
 extern crate util;
 
@@ -19,11 +20,11 @@ use gfx::paint_task::PaintChan;
 use msg::constellation_msg::{ConstellationChan, Failure, PipelineId, PipelineExitType};
 use net::image_cache_task::ImageCacheTask;
 use net::resource_task::ResourceTask;
-use url::Url;
-use util::memory::MemoryProfilerChan;
-use util::time::TimeProfilerChan;
+use profile::mem::MemoryProfilerChan;
+use profile::time::TimeProfilerChan;
 use script_traits::{ScriptControlChan, OpaqueScriptLayoutChannel};
 use std::sync::mpsc::{Sender, Receiver};
+use url::Url;
 
 /// Messages sent to the layout task from the constellation
 pub enum LayoutControlMsg {
diff --git a/components/net/Cargo.toml b/components/net/Cargo.toml
index 440bed882e6..8f8c43b4139 100644
--- a/components/net/Cargo.toml
+++ b/components/net/Cargo.toml
@@ -7,6 +7,9 @@ authors = ["The Servo Project Developers"]
 name = "net"
 path = "lib.rs"
 
+[dependencies.profile]
+path = "../profile"
+
 [dependencies.util]
 path = "../util"
 
diff --git a/components/net/image_cache_task.rs b/components/net/image_cache_task.rs
index ecb6b4ae396..43a0d085507 100644
--- a/components/net/image_cache_task.rs
+++ b/components/net/image_cache_task.rs
@@ -7,9 +7,7 @@ use resource_task;
 use resource_task::{LoadData, ResourceTask};
 use resource_task::ProgressMsg::{Payload, Done};
 
-use util::task::spawn_named;
-use util::taskpool::TaskPool;
-use util::time::{self, profile, TimeProfilerChan};
+use profile::time::{self, profile, TimeProfilerChan};
 use std::borrow::ToOwned;
 use std::collections::HashMap;
 use std::collections::hash_map::Entry::{Occupied, Vacant};
@@ -17,6 +15,8 @@ use std::mem::replace;
 use std::sync::{Arc, Mutex};
 use std::sync::mpsc::{channel, Receiver, Sender};
 use url::Url;
+use util::task::spawn_named;
+use util::taskpool::TaskPool;
 
 pub enum Msg {
     /// Tell the cache that we may need a particular image soon. Must be posted
@@ -495,10 +495,10 @@ mod tests {
     use resource_task::ProgressMsg::{Payload, Done};
     use sniffer_task;
     use image::base::test_image_bin;
-    use util::taskpool::TaskPool;
-    use util::time::{TimeProfiler, TimeProfilerChan};
+    use profile::time::{TimeProfiler, TimeProfilerChan};
     use std::sync::mpsc::{Sender, channel, Receiver};
     use url::Url;
+    use util::taskpool::TaskPool;
 
     trait Closure {
         fn invoke(&self, _response: Sender<resource_task::ProgressMsg>) { }
diff --git a/components/net/lib.rs b/components/net/lib.rs
index 410e8ab1556..4933d64f0e6 100644
--- a/components/net/lib.rs
+++ b/components/net/lib.rs
@@ -26,6 +26,7 @@ extern crate png;
 #[macro_use]
 extern crate log;
 extern crate openssl;
+extern crate profile;
 extern crate "rustc-serialize" as rustc_serialize;
 extern crate util;
 extern crate stb_image;
diff --git a/components/profile/Cargo.toml b/components/profile/Cargo.toml
new file mode 100644
index 00000000000..de9fb13a597
--- /dev/null
+++ b/components/profile/Cargo.toml
@@ -0,0 +1,20 @@
+[package]
+name = "profile"
+version = "0.0.1"
+authors = ["The Servo Project Developers"]
+
+[lib]
+name = "profile"
+path = "lib.rs"
+
+[dependencies.task_info]
+path = "../../support/rust-task_info"
+
+[dependencies.util]
+path = "../util"
+
+[dependencies]
+libc = "*"
+regex = "0.1.14"
+time = "0.1.12"
+url = "0.2.16"
diff --git a/components/profile/lib.rs b/components/profile/lib.rs
new file mode 100644
index 00000000000..c8ffdc72d17
--- /dev/null
+++ b/components/profile/lib.rs
@@ -0,0 +1,27 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#![feature(collections)]
+#![feature(core)]
+#![cfg_attr(target_os="linux", feature(io))]
+#![feature(old_io)]
+#![cfg_attr(target_os="linux", feature(page_size))]
+#![feature(rustc_private)]
+#![feature(std_misc)]
+#![cfg_attr(target_os="linux", feature(str_words))]
+
+#[macro_use] extern crate log;
+
+extern crate collections;
+extern crate libc;
+#[cfg(target_os="linux")]
+extern crate regex;
+#[cfg(target_os="macos")]
+extern crate task_info;
+extern crate "time" as std_time;
+extern crate util;
+extern crate url;
+
+pub mod mem;
+pub mod time;
diff --git a/components/profile/mem.rs b/components/profile/mem.rs
new file mode 100644
index 00000000000..163a255659d
--- /dev/null
+++ b/components/profile/mem.rs
@@ -0,0 +1,658 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+//! Memory profiling functions.
+
+use self::system_reporter::SystemMemoryReporter;
+use std::borrow::ToOwned;
+use std::cmp::Ordering;
+use std::collections::HashMap;
+use std::old_io::timer::sleep;
+use std::sync::mpsc::{Sender, channel, Receiver};
+use std::time::duration::Duration;
+use util::task::spawn_named;
+
+#[derive(Clone)]
+pub struct MemoryProfilerChan(pub Sender<MemoryProfilerMsg>);
+
+impl MemoryProfilerChan {
+    pub fn send(&self, msg: MemoryProfilerMsg) {
+        let MemoryProfilerChan(ref c) = *self;
+        c.send(msg).unwrap();
+    }
+}
+
+/// An easy way to build a path for a report.
+#[macro_export]
+macro_rules! path {
+    ($($x:expr),*) => {{
+        use std::borrow::ToOwned;
+        vec![$( $x.to_owned() ),*]
+    }}
+}
+
+pub struct MemoryReport {
+    /// The identifying path for this report.
+    pub path: Vec<String>,
+
+    /// The size, in bytes.
+    pub size: u64,
+}
+
+/// A channel through which memory reports can be sent.
+#[derive(Clone)]
+pub struct MemoryReportsChan(pub Sender<Vec<MemoryReport>>);
+
+impl MemoryReportsChan {
+    pub fn send(&self, report: Vec<MemoryReport>) {
+        let MemoryReportsChan(ref c) = *self;
+        c.send(report).unwrap();
+    }
+}
+
+/// A memory reporter is capable of measuring some data structure of interest. Because it needs
+/// to be passed to and registered with the MemoryProfiler, it's typically a "small" (i.e. easily
+/// cloneable) value that provides access to a "large" data structure, e.g. a channel that can
+/// inject a request for measurements into the event queue associated with the "large" data
+/// structure.
+pub trait MemoryReporter {
+    /// Collect one or more memory reports. Returns true on success, and false on failure.
+    fn collect_reports(&self, reports_chan: MemoryReportsChan) -> bool;
+}
+
+/// Messages that can be sent to the memory profiler thread.
+pub enum MemoryProfilerMsg {
+    /// Register a MemoryReporter with the memory profiler. The String is only used to identify the
+    /// reporter so it can be unregistered later. The String must be distinct from that used by any
+    /// other registered reporter otherwise a panic will occur.
+    RegisterMemoryReporter(String, Box<MemoryReporter + Send>),
+
+    /// Unregister a MemoryReporter with the memory profiler. The String must match the name given
+    /// when the reporter was registered. If the String does not match the name of a registered
+    /// reporter a panic will occur.
+    UnregisterMemoryReporter(String),
+
+    /// Triggers printing of the memory profiling metrics.
+    Print,
+
+    /// Tells the memory profiler to shut down.
+    Exit,
+}
+
+pub struct MemoryProfiler {
+    /// The port through which messages are received.
+    pub port: Receiver<MemoryProfilerMsg>,
+
+    /// Registered memory reporters.
+    reporters: HashMap<String, Box<MemoryReporter + Send>>,
+}
+
+impl MemoryProfiler {
+    pub fn create(period: Option<f64>) -> MemoryProfilerChan {
+        let (chan, port) = channel();
+
+        // Create the timer thread if a period was provided.
+        if let Some(period) = period {
+            let period_ms = Duration::milliseconds((period * 1000f64) as i64);
+            let chan = chan.clone();
+            spawn_named("Memory profiler timer".to_owned(), move || {
+                loop {
+                    sleep(period_ms);
+                    if chan.send(MemoryProfilerMsg::Print).is_err() {
+                        break;
+                    }
+                }
+            });
+        }
+
+        // Always spawn the memory profiler. If there is no timer thread it won't receive regular
+        // `Print` events, but it will still receive the other events.
+        spawn_named("Memory profiler".to_owned(), move || {
+            let mut memory_profiler = MemoryProfiler::new(port);
+            memory_profiler.start();
+        });
+
+        let memory_profiler_chan = MemoryProfilerChan(chan);
+
+        // Register the system memory reporter, which will run on the memory profiler's own thread.
+        // It never needs to be unregistered, because as long as the memory profiler is running the
+        // system memory reporter can make measurements.
+        let system_reporter = Box::new(SystemMemoryReporter);
+        memory_profiler_chan.send(MemoryProfilerMsg::RegisterMemoryReporter("system".to_owned(),
+                                                                            system_reporter));
+
+        memory_profiler_chan
+    }
+
+    pub fn new(port: Receiver<MemoryProfilerMsg>) -> MemoryProfiler {
+        MemoryProfiler {
+            port: port,
+            reporters: HashMap::new(),
+        }
+    }
+
+    pub fn start(&mut self) {
+        loop {
+            match self.port.recv() {
+               Ok(msg) => {
+                   if !self.handle_msg(msg) {
+                       break
+                   }
+               }
+               _ => break
+            }
+        }
+    }
+
+    fn handle_msg(&mut self, msg: MemoryProfilerMsg) -> bool {
+        match msg {
+            MemoryProfilerMsg::RegisterMemoryReporter(name, reporter) => {
+                // Panic if it has already been registered.
+                let name_clone = name.clone();
+                match self.reporters.insert(name, reporter) {
+                    None => true,
+                    Some(_) =>
+                        panic!(format!("RegisterMemoryReporter: '{}' name is already in use",
+                                       name_clone)),
+                }
+            },
+
+            MemoryProfilerMsg::UnregisterMemoryReporter(name) => {
+                // Panic if it hasn't previously been registered.
+                match self.reporters.remove(&name) {
+                    Some(_) => true,
+                    None =>
+                        panic!(format!("UnregisterMemoryReporter: '{}' name is unknown", &name)),
+                }
+            },
+
+            MemoryProfilerMsg::Print => {
+                self.handle_print_msg();
+                true
+            },
+
+            MemoryProfilerMsg::Exit => false
+        }
+    }
+
+    fn handle_print_msg(&self) {
+        println!("Begin memory reports");
+        println!("|");
+
+        // Collect reports from memory reporters.
+        //
+        // This serializes the report-gathering. It might be worth creating a new scoped thread for
+        // each reporter once we have enough of them.
+        //
+        // If anything goes wrong with a reporter, we just skip it.
+        let mut forest = ReportsForest::new();
+        for reporter in self.reporters.values() {
+            let (chan, port) = channel();
+            if reporter.collect_reports(MemoryReportsChan(chan)) {
+                if let Ok(reports) = port.recv() {
+                    for report in reports.iter() {
+                        forest.insert(&report.path, report.size);
+                    }
+                }
+            }
+        }
+        forest.print();
+
+        println!("|");
+        println!("End memory reports");
+        println!("");
+    }
+}
+
+/// A collection of one or more reports with the same initial path segment. A ReportsTree
+/// containing a single node is described as "degenerate".
+struct ReportsTree {
+    /// For leaf nodes, this is the sum of the sizes of all reports that mapped to this location.
+    /// For interior nodes, this is the sum of the sizes of all its child nodes.
+    size: u64,
+
+    /// For leaf nodes, this is the count of all reports that mapped to this location.
+    /// For interor nodes, this is always zero.
+    count: u32,
+
+    /// The segment from the report path that maps to this node.
+    path_seg: String,
+
+    /// Child nodes.
+    children: Vec<ReportsTree>,
+}
+
+impl ReportsTree {
+    fn new(path_seg: String) -> ReportsTree {
+        ReportsTree {
+            size: 0,
+            count: 0,
+            path_seg: path_seg,
+            children: vec![]
+        }
+    }
+
+    // Searches the tree's children for a path_seg match, and returns the index if there is a
+    // match.
+    fn find_child(&self, path_seg: &String) -> Option<usize> {
+        for (i, child) in self.children.iter().enumerate() {
+            if child.path_seg == *path_seg {
+                return Some(i);
+            }
+        }
+        None
+    }
+
+    // Insert the path and size into the tree, adding any nodes as necessary.
+    fn insert(&mut self, path: &[String], size: u64) {
+        let mut t: &mut ReportsTree = self;
+        for path_seg in path.iter() {
+            let i = match t.find_child(&path_seg) {
+                Some(i) => i,
+                None => {
+                    let new_t = ReportsTree::new(path_seg.clone());
+                    t.children.push(new_t);
+                    t.children.len() - 1
+                },
+            };
+            let tmp = t;    // this temporary is needed to satisfy the borrow checker
+            t = &mut tmp.children[i];
+        }
+
+        t.size += size;
+        t.count += 1;
+    }
+
+    // Fill in sizes for interior nodes. Should only be done once all the reports have been
+    // inserted.
+    fn compute_interior_node_sizes(&mut self) -> u64 {
+        if !self.children.is_empty() {
+            // Interior node. Derive its size from its children.
+            if self.size != 0 {
+                // This will occur if e.g. we have paths ["a", "b"] and ["a", "b", "c"].
+                panic!("one report's path is a sub-path of another report's path");
+            }
+            for child in self.children.iter_mut() {
+                self.size += child.compute_interior_node_sizes();
+            }
+        }
+        self.size
+    }
+
+    fn print(&self, depth: i32) {
+        if !self.children.is_empty() {
+            assert_eq!(self.count, 0);
+        }
+
+        let mut indent_str = String::new();
+        for _ in range(0, depth) {
+            indent_str.push_str("   ");
+        }
+
+        let mebi = 1024f64 * 1024f64;
+        let count_str = if self.count > 1 { format!(" {}", self.count) } else { "".to_owned() };
+        println!("|{}{:8.2} MiB -- {}{}",
+                 indent_str, (self.size as f64) / mebi, self.path_seg, count_str);
+
+        for child in self.children.iter() {
+            child.print(depth + 1);
+        }
+    }
+}
+
+/// A collection of ReportsTrees. It represents the data from multiple memory reports in a form
+/// that's good to print.
+struct ReportsForest {
+    trees: HashMap<String, ReportsTree>,
+}
+
+impl ReportsForest {
+    fn new() -> ReportsForest {
+        ReportsForest {
+            trees: HashMap::new(),
+        }
+    }
+
+    // Insert the path and size into the forest, adding any trees and nodes as necessary.
+    fn insert(&mut self, path: &[String], size: u64) {
+        // Get the right tree, creating it if necessary.
+        if !self.trees.contains_key(&path[0]) {
+            self.trees.insert(path[0].clone(), ReportsTree::new(path[0].clone()));
+        }
+        let t = self.trees.get_mut(&path[0]).unwrap();
+
+        // Use tail() because the 0th path segment was used to find the right tree in the forest.
+        t.insert(path.tail(), size);
+    }
+
+    fn print(&mut self) {
+        // Fill in sizes of interior nodes.
+        for (_, tree) in self.trees.iter_mut() {
+            tree.compute_interior_node_sizes();
+        }
+
+        // Put the trees into a sorted vector. Primary sort: degenerate trees (those containing a
+        // single node) come after non-degenerate trees. Secondary sort: alphabetical order of the
+        // root node's path_seg.
+        let mut v = vec![];
+        for (_, tree) in self.trees.iter() {
+            v.push(tree);
+        }
+        v.sort_by(|a, b| {
+            if a.children.is_empty() && !b.children.is_empty() {
+                Ordering::Greater
+            } else if !a.children.is_empty() && b.children.is_empty() {
+                Ordering::Less
+            } else {
+                a.path_seg.cmp(&b.path_seg)
+            }
+        });
+
+        // Print the forest.
+        for tree in v.iter() {
+            tree.print(0);
+            // Print a blank line after non-degenerate trees.
+            if !tree.children.is_empty() {
+                println!("|");
+            }
+        }
+    }
+}
+
+//---------------------------------------------------------------------------
+
+mod system_reporter {
+    use libc::{c_char, c_int, c_void, size_t};
+    use std::borrow::ToOwned;
+    use std::ffi::CString;
+    use std::mem::size_of;
+    use std::ptr::null_mut;
+    use super::{MemoryReport, MemoryReporter, MemoryReportsChan};
+    #[cfg(target_os="macos")]
+    use task_info::task_basic_info::{virtual_size, resident_size};
+
+    /// Collects global measurements from the OS and heap allocators.
+    pub struct SystemMemoryReporter;
+
+    impl MemoryReporter for SystemMemoryReporter {
+        fn collect_reports(&self, reports_chan: MemoryReportsChan) -> bool {
+            let mut reports = vec![];
+            {
+                let mut report = |path, size| {
+                    if let Some(size) = size {
+                        reports.push(MemoryReport { path: path, size: size });
+                    }
+                };
+
+                // Virtual and physical memory usage, as reported by the OS.
+                report(path!["vsize"], get_vsize());
+                report(path!["resident"], get_resident());
+
+                // Memory segments, as reported by the OS.
+                for seg in get_resident_segments().iter() {
+                    report(path!["resident-according-to-smaps", seg.0], Some(seg.1));
+                }
+
+                // Total number of bytes allocated by the application on the system
+                // heap.
+                report(path!["system-heap-allocated"], get_system_heap_allocated());
+
+                // The descriptions of the following jemalloc measurements are taken
+                // directly from the jemalloc documentation.
+
+                // "Total number of bytes allocated by the application."
+                report(path!["jemalloc-heap-allocated"], get_jemalloc_stat("stats.allocated"));
+
+                // "Total number of bytes in active pages allocated by the application.
+                // This is a multiple of the page size, and greater than or equal to
+                // |stats.allocated|."
+                report(path!["jemalloc-heap-active"], get_jemalloc_stat("stats.active"));
+
+                // "Total number of bytes in chunks mapped on behalf of the application.
+                // This is a multiple of the chunk size, and is at least as large as
+                // |stats.active|. This does not include inactive chunks."
+                report(path!["jemalloc-heap-mapped"], get_jemalloc_stat("stats.mapped"));
+            }
+            reports_chan.send(reports);
+
+            true
+        }
+    }
+
+
+    #[cfg(target_os="linux")]
+    extern {
+        fn mallinfo() -> struct_mallinfo;
+    }
+
+    #[cfg(target_os="linux")]
+    #[repr(C)]
+    pub struct struct_mallinfo {
+        arena:    c_int,
+        ordblks:  c_int,
+        smblks:   c_int,
+        hblks:    c_int,
+        hblkhd:   c_int,
+        usmblks:  c_int,
+        fsmblks:  c_int,
+        uordblks: c_int,
+        fordblks: c_int,
+        keepcost: c_int,
+    }
+
+    #[cfg(target_os="linux")]
+    fn get_system_heap_allocated() -> Option<u64> {
+        let mut info: struct_mallinfo;
+        unsafe {
+            info = mallinfo();
+        }
+        // The documentation in the glibc man page makes it sound like |uordblks|
+        // would suffice, but that only gets the small allocations that are put in
+        // the brk heap. We need |hblkhd| as well to get the larger allocations
+        // that are mmapped.
+        Some((info.hblkhd + info.uordblks) as u64)
+    }
+
+    #[cfg(not(target_os="linux"))]
+    fn get_system_heap_allocated() -> Option<u64> {
+        None
+    }
+
+    extern {
+        fn je_mallctl(name: *const c_char, oldp: *mut c_void, oldlenp: *mut size_t,
+                      newp: *mut c_void, newlen: size_t) -> c_int;
+    }
+
+    fn get_jemalloc_stat(value_name: &str) -> Option<u64> {
+        // Before we request the measurement of interest, we first send an "epoch"
+        // request. Without that jemalloc gives cached statistics(!) which can be
+        // highly inaccurate.
+        let epoch_name = "epoch";
+        let epoch_c_name = CString::new(epoch_name).unwrap();
+        let mut epoch: u64 = 0;
+        let epoch_ptr = &mut epoch as *mut _ as *mut c_void;
+        let mut epoch_len = size_of::<u64>() as size_t;
+
+        let value_c_name = CString::new(value_name).unwrap();
+        let mut value: size_t = 0;
+        let value_ptr = &mut value as *mut _ as *mut c_void;
+        let mut value_len = size_of::<size_t>() as size_t;
+
+        // Using the same values for the `old` and `new` parameters is enough
+        // to get the statistics updated.
+        let rv = unsafe {
+            je_mallctl(epoch_c_name.as_ptr(), epoch_ptr, &mut epoch_len, epoch_ptr,
+                       epoch_len)
+        };
+        if rv != 0 {
+            return None;
+        }
+
+        let rv = unsafe {
+            je_mallctl(value_c_name.as_ptr(), value_ptr, &mut value_len, null_mut(), 0)
+        };
+        if rv != 0 {
+            return None;
+        }
+
+        Some(value as u64)
+    }
+
+    // Like std::macros::try!, but for Option<>.
+    macro_rules! option_try(
+        ($e:expr) => (match $e { Some(e) => e, None => return None })
+    );
+
+    #[cfg(target_os="linux")]
+    fn get_proc_self_statm_field(field: usize) -> Option<u64> {
+        use std::fs::File;
+        use std::io::Read;
+
+        let mut f = option_try!(File::open("/proc/self/statm").ok());
+        let mut contents = String::new();
+        option_try!(f.read_to_string(&mut contents).ok());
+        let s = option_try!(contents.words().nth(field));
+        let npages = option_try!(s.parse::<u64>().ok());
+        Some(npages * (::std::env::page_size() as u64))
+    }
+
+    #[cfg(target_os="linux")]
+    fn get_vsize() -> Option<u64> {
+        get_proc_self_statm_field(0)
+    }
+
+    #[cfg(target_os="linux")]
+    fn get_resident() -> Option<u64> {
+        get_proc_self_statm_field(1)
+    }
+
+    #[cfg(target_os="macos")]
+    fn get_vsize() -> Option<u64> {
+        virtual_size()
+    }
+
+    #[cfg(target_os="macos")]
+    fn get_resident() -> Option<u64> {
+        resident_size()
+    }
+
+    #[cfg(not(any(target_os="linux", target_os = "macos")))]
+    fn get_vsize() -> Option<u64> {
+        None
+    }
+
+    #[cfg(not(any(target_os="linux", target_os = "macos")))]
+    fn get_resident() -> Option<u64> {
+        None
+    }
+
+    #[cfg(target_os="linux")]
+    fn get_resident_segments() -> Vec<(String, u64)> {
+        use regex::Regex;
+        use std::collections::HashMap;
+        use std::collections::hash_map::Entry;
+        use std::fs::File;
+        use std::io::{BufReader, BufReadExt};
+
+        // The first line of an entry in /proc/<pid>/smaps looks just like an entry
+        // in /proc/<pid>/maps:
+        //
+        //   address           perms offset  dev   inode  pathname
+        //   02366000-025d8000 rw-p 00000000 00:00 0      [heap]
+        //
+        // Each of the following lines contains a key and a value, separated
+        // by ": ", where the key does not contain either of those characters.
+        // For example:
+        //
+        //   Rss:           132 kB
+
+        let f = match File::open("/proc/self/smaps") {
+            Ok(f) => BufReader::new(f),
+            Err(_) => return vec![],
+        };
+
+        let seg_re = Regex::new(
+            r"^[:xdigit:]+-[:xdigit:]+ (....) [:xdigit:]+ [:xdigit:]+:[:xdigit:]+ \d+ +(.*)").unwrap();
+        let rss_re = Regex::new(r"^Rss: +(\d+) kB").unwrap();
+
+        // We record each segment's resident size.
+        let mut seg_map: HashMap<String, u64> = HashMap::new();
+
+        #[derive(PartialEq)]
+        enum LookingFor { Segment, Rss }
+        let mut looking_for = LookingFor::Segment;
+
+        let mut curr_seg_name = String::new();
+
+        // Parse the file.
+        for line in f.lines() {
+            let line = match line {
+                Ok(line) => line,
+                Err(_) => continue,
+            };
+            if looking_for == LookingFor::Segment {
+                // Look for a segment info line.
+                let cap = match seg_re.captures(line.as_slice()) {
+                    Some(cap) => cap,
+                    None => continue,
+                };
+                let perms = cap.at(1).unwrap();
+                let pathname = cap.at(2).unwrap();
+
+                // Construct the segment name from its pathname and permissions.
+                curr_seg_name.clear();
+                if pathname == "" || pathname.starts_with("[stack:") {
+                    // Anonymous memory. Entries marked with "[stack:nnn]"
+                    // look like thread stacks but they may include other
+                    // anonymous mappings, so we can't trust them and just
+                    // treat them as entirely anonymous.
+                    curr_seg_name.push_str("anonymous");
+                } else {
+                    curr_seg_name.push_str(pathname);
+                }
+                curr_seg_name.push_str(" (");
+                curr_seg_name.push_str(perms);
+                curr_seg_name.push_str(")");
+
+                looking_for = LookingFor::Rss;
+            } else {
+                // Look for an "Rss:" line.
+                let cap = match rss_re.captures(line.as_slice()) {
+                    Some(cap) => cap,
+                    None => continue,
+                };
+                let rss = cap.at(1).unwrap().parse::<u64>().unwrap() * 1024;
+
+                if rss > 0 {
+                    // Aggregate small segments into "other".
+                    let seg_name = if rss < 512 * 1024 {
+                        "other".to_owned()
+                    } else {
+                        curr_seg_name.clone()
+                    };
+                    match seg_map.entry(seg_name) {
+                        Entry::Vacant(entry) => { entry.insert(rss); },
+                        Entry::Occupied(mut entry) => *entry.get_mut() += rss,
+                    }
+                }
+
+                looking_for = LookingFor::Segment;
+            }
+        }
+
+        let mut segs: Vec<(String, u64)> = seg_map.into_iter().collect();
+
+        // Note that the sum of all these segments' RSS values differs from the "resident" measurement
+        // obtained via /proc/<pid>/statm in get_resident(). It's unclear why this difference occurs;
+        // for some processes the measurements match, but for Servo they do not.
+        segs.sort_by(|&(_, rss1), &(_, rss2)| rss2.cmp(&rss1));
+
+        segs
+    }
+
+    #[cfg(not(target_os="linux"))]
+    fn get_resident_segments() -> Vec<(String, u64)> {
+        vec![]
+    }
+}
diff --git a/components/util/time.rs b/components/profile/time.rs
index 1cae21719d4..fcd83d8093a 100644
--- a/components/util/time.rs
+++ b/components/profile/time.rs
@@ -14,8 +14,8 @@ use std::num::Float;
 use std::sync::mpsc::{Sender, channel, Receiver};
 use std::time::duration::Duration;
 use std_time::precise_time_ns;
-use task::{spawn_named};
 use url::Url;
+use util::task::spawn_named;
 
 // front-end representation of the profiler used to communicate with the profiler
 #[derive(Clone)]
diff --git a/components/script/Cargo.toml b/components/script/Cargo.toml
index d7f1b2916b5..ac910ecb32a 100644
--- a/components/script/Cargo.toml
+++ b/components/script/Cargo.toml
@@ -24,6 +24,9 @@ path = "../msg"
 [dependencies.net]
 path = "../net"
 
+[dependencies.profile]
+path = "../profile"
+
 [dependencies.script_traits]
 path = "../script_traits"
 
diff --git a/components/script/layout_interface.rs b/components/script/layout_interface.rs
index 52b5aed1b43..b24adf944f6 100644
--- a/components/script/layout_interface.rs
+++ b/components/script/layout_interface.rs
@@ -10,16 +10,16 @@ use dom::node::LayoutData;
 
 use geom::point::Point2D;
 use geom::rect::Rect;
-use script_traits::{ScriptControlChan, OpaqueScriptLayoutChannel, UntrustedNodeAddress};
 use msg::constellation_msg::{PipelineExitType, WindowSizeData};
-use util::geometry::Au;
-use util::memory::{MemoryReporter, MemoryReportsChan};
+use profile::mem::{MemoryReporter, MemoryReportsChan};
+use script_traits::{ScriptControlChan, OpaqueScriptLayoutChannel, UntrustedNodeAddress};
 use std::any::Any;
 use std::sync::mpsc::{channel, Receiver, Sender};
 use std::boxed::BoxAny;
 use style::stylesheets::Stylesheet;
 use style::media_queries::MediaQueryList;
 use url::Url;
+use util::geometry::Au;
 
 pub use dom::node::TrustedNodeAddress;
 
diff --git a/components/script/lib.rs b/components/script/lib.rs
index 5895127b552..44ac6f1856c 100644
--- a/components/script/lib.rs
+++ b/components/script/lib.rs
@@ -43,6 +43,7 @@ extern crate net;
 extern crate "rustc-serialize" as rustc_serialize;
 extern crate time;
 extern crate canvas;
+extern crate profile;
 extern crate script_traits;
 extern crate selectors;
 extern crate util;
diff --git a/components/servo/Cargo.lock b/components/servo/Cargo.lock
index 3e289cf5f2a..bc520d62f3e 100644
--- a/components/servo/Cargo.lock
+++ b/components/servo/Cargo.lock
@@ -12,6 +12,7 @@ dependencies = [
  "msg 0.0.1",
  "net 0.0.1",
  "png 0.1.0 (git+https://github.com/servo/rust-png)",
+ "profile 0.0.1",
  "script 0.0.1",
  "time 0.1.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "url 0.2.23 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -93,6 +94,7 @@ dependencies = [
  "msg 0.0.1",
  "net 0.0.1",
  "png 0.1.0 (git+https://github.com/servo/rust-png)",
+ "profile 0.0.1",
  "script_traits 0.0.1",
  "time 0.1.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "url 0.2.23 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -308,6 +310,7 @@ dependencies = [
  "net 0.0.1",
  "plugins 0.0.1",
  "png 0.1.0 (git+https://github.com/servo/rust-png)",
+ "profile 0.0.1",
  "rustc-serialize 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "script_traits 0.0.1",
  "skia 0.0.20130412 (git+https://github.com/servo/skia?branch=upstream-2014-06-16)",
@@ -510,6 +513,7 @@ dependencies = [
  "net 0.0.1",
  "plugins 0.0.1",
  "png 0.1.0 (git+https://github.com/servo/rust-png)",
+ "profile 0.0.1",
  "rustc-serialize 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "script 0.0.1",
  "script_traits 0.0.1",
@@ -528,6 +532,7 @@ dependencies = [
  "gfx 0.0.1",
  "msg 0.0.1",
  "net 0.0.1",
+ "profile 0.0.1",
  "script_traits 0.0.1",
  "url 0.2.23 (registry+https://github.com/rust-lang/crates.io-index)",
  "util 0.0.1",
@@ -609,6 +614,7 @@ dependencies = [
  "hyper 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "openssl 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "png 0.1.0 (git+https://github.com/servo/rust-png)",
+ "profile 0.0.1",
  "regex 0.1.18 (registry+https://github.com/rust-lang/crates.io-index)",
  "regex_macros 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-serialize 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -698,6 +704,18 @@ version = "1.6.16"
 source = "git+https://github.com/servo/rust-png#1d9c59c97598014860077f372443ae98b35ff4d9"
 
 [[package]]
+name = "profile"
+version = "0.0.1"
+dependencies = [
+ "libc 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex 0.1.18 (registry+https://github.com/rust-lang/crates.io-index)",
+ "task_info 0.0.1",
+ "time 0.1.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "url 0.2.23 (registry+https://github.com/rust-lang/crates.io-index)",
+ "util 0.0.1",
+]
+
+[[package]]
 name = "rand"
 version = "0.1.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -742,6 +760,7 @@ dependencies = [
  "msg 0.0.1",
  "net 0.0.1",
  "plugins 0.0.1",
+ "profile 0.0.1",
  "rustc-serialize 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "script_traits 0.0.1",
  "selectors 0.1.0 (git+https://github.com/servo/rust-selectors)",
@@ -887,15 +906,12 @@ dependencies = [
  "libc 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "plugins 0.0.1",
  "rand 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "regex 0.1.18 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-serialize 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "selectors 0.1.0 (git+https://github.com/servo/rust-selectors)",
  "string_cache 0.0.0 (git+https://github.com/servo/string-cache)",
  "string_cache_plugin 0.0.0 (git+https://github.com/servo/string-cache)",
- "task_info 0.0.1",
  "text_writer 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "time 0.1.19 (registry+https://github.com/rust-lang/crates.io-index)",
- "url 0.2.23 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
diff --git a/components/servo/Cargo.toml b/components/servo/Cargo.toml
index 5dfbbe8696c..64e7f060773 100644
--- a/components/servo/Cargo.toml
+++ b/components/servo/Cargo.toml
@@ -51,6 +51,9 @@ path = "../net"
 [dependencies.msg]
 path = "../msg"
 
+[dependencies.profile]
+path = "../profile"
+
 [dependencies.util]
 path = "../util"
 
diff --git a/components/servo/lib.rs b/components/servo/lib.rs
index 0312fca761e..bc86b6a4215 100644
--- a/components/servo/lib.rs
+++ b/components/servo/lib.rs
@@ -11,6 +11,7 @@ extern crate compositing;
 extern crate devtools;
 extern crate net;
 extern crate msg;
+extern crate profile;
 #[macro_use]
 extern crate util;
 extern crate script;
@@ -40,9 +41,9 @@ use net::storage_task::{StorageTaskFactory, StorageTask};
 #[cfg(not(test))]
 use gfx::font_cache_task::FontCacheTask;
 #[cfg(not(test))]
-use util::time::TimeProfiler;
+use profile::mem::MemoryProfiler;
 #[cfg(not(test))]
-use util::memory::MemoryProfiler;
+use profile::time::TimeProfiler;
 #[cfg(not(test))]
 use util::opts;
 #[cfg(not(test))]
diff --git a/components/util/Cargo.toml b/components/util/Cargo.toml
index 2070c9bb158..1fc0ac21f61 100644
--- a/components/util/Cargo.toml
+++ b/components/util/Cargo.toml
@@ -30,9 +30,6 @@ git = "https://github.com/servo/rust-geom"
 [dependencies.layers]
 git = "https://github.com/servo/rust-layers"
 
-[dependencies.task_info]
-path = "../../support/rust-task_info"
-
 [dependencies.string_cache]
 git = "https://github.com/servo/string-cache"
 
@@ -46,8 +43,6 @@ git = "https://github.com/Kimundi/lazy-static.rs"
 bitflags = "*"
 libc = "*"
 rand = "*"
-regex = "0.1.14"
 rustc-serialize = "0.3"
 text_writer = "0.1.1"
 time = "0.1.12"
-url = "0.2.16"
diff --git a/components/util/lib.rs b/components/util/lib.rs
index 58b29b66b49..62068621467 100644
--- a/components/util/lib.rs
+++ b/components/util/lib.rs
@@ -12,7 +12,6 @@
 #![feature(io)]
 #![feature(old_io)]
 #![feature(optin_builtin_traits)]
-#![cfg_attr(target_os = "linux", feature(page_size, str_words))]
 #![feature(path)]
 #![feature(path_ext)]
 #![feature(plugin)]
@@ -27,7 +26,6 @@
 
 extern crate alloc;
 #[macro_use] extern crate bitflags;
-extern crate collections;
 extern crate cssparser;
 extern crate geom;
 extern crate getopts;
@@ -35,19 +33,10 @@ extern crate layers;
 extern crate libc;
 #[no_link] #[macro_use] extern crate cssparser;
 extern crate rand;
-#[cfg(target_os="linux")]
-extern crate regex;
 extern crate "rustc-serialize" as rustc_serialize;
-#[cfg(target_os="macos")]
-extern crate task_info;
-extern crate "time" as std_time;
 extern crate text_writer;
 extern crate selectors;
 extern crate string_cache;
-extern crate unicode;
-extern crate url;
-
-extern crate lazy_static;
 
 pub use selectors::smallvec;
 
@@ -70,7 +59,6 @@ pub mod resource_files;
 pub mod str;
 pub mod task;
 pub mod tid;
-pub mod time;
 pub mod taskpool;
 pub mod task_state;
 pub mod vec;
diff --git a/components/util/memory.rs b/components/util/memory.rs
index 88379bcebfd..4cefce3d0e7 100644
--- a/components/util/memory.rs
+++ b/components/util/memory.rs
@@ -2,23 +2,12 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-//! Memory profiling functions.
+//! Data structure measurement.
 
-use libc::{c_char,c_int,c_void,size_t};
-use std::borrow::ToOwned;
-use std::cmp::Ordering;
-use std::collections::HashMap;
+use libc::{c_void, size_t};
 use std::collections::LinkedList;
-use std::ffi::CString;
-use std::old_io::timer::sleep;
-use std::mem::{size_of, transmute};
-use std::ptr::null_mut;
+use std::mem::transmute;
 use std::sync::Arc;
-use std::sync::mpsc::{Sender, channel, Receiver};
-use std::time::duration::Duration;
-use task::spawn_named;
-#[cfg(target_os="macos")]
-use task_info::task_basic_info::{virtual_size,resident_size};
 
 extern {
     // Get the size of a heap block.
@@ -170,638 +159,3 @@ impl<T> Drop for LinkedList2<T> {
     fn drop(&mut self) {}
 }
 
-//---------------------------------------------------------------------------
-
-#[derive(Clone)]
-pub struct MemoryProfilerChan(pub Sender<MemoryProfilerMsg>);
-
-impl MemoryProfilerChan {
-    pub fn send(&self, msg: MemoryProfilerMsg) {
-        let MemoryProfilerChan(ref c) = *self;
-        c.send(msg).unwrap();
-    }
-}
-
-/// An easy way to build a path for a report.
-#[macro_export]
-macro_rules! path {
-    ($($x:expr),*) => {{ vec![$( $x.to_owned() ),*] }}
-}
-
-pub struct MemoryReport {
-    /// The identifying path for this report.
-    pub path: Vec<String>,
-
-    /// The size, in bytes.
-    pub size: u64,
-}
-
-/// A channel through which memory reports can be sent.
-#[derive(Clone)]
-pub struct MemoryReportsChan(pub Sender<Vec<MemoryReport>>);
-
-impl MemoryReportsChan {
-    pub fn send(&self, report: Vec<MemoryReport>) {
-        let MemoryReportsChan(ref c) = *self;
-        c.send(report).unwrap();
-    }
-}
-
-/// A memory reporter is capable of measuring some data structure of interest. Because it needs
-/// to be passed to and registered with the MemoryProfiler, it's typically a "small" (i.e. easily
-/// cloneable) value that provides access to a "large" data structure, e.g. a channel that can
-/// inject a request for measurements into the event queue associated with the "large" data
-/// structure.
-pub trait MemoryReporter {
-    /// Collect one or more memory reports. Returns true on success, and false on failure.
-    fn collect_reports(&self, reports_chan: MemoryReportsChan) -> bool;
-}
-
-/// Messages that can be sent to the memory profiler thread.
-pub enum MemoryProfilerMsg {
-    /// Register a MemoryReporter with the memory profiler. The String is only used to identify the
-    /// reporter so it can be unregistered later. The String must be distinct from that used by any
-    /// other registered reporter otherwise a panic will occur.
-    RegisterMemoryReporter(String, Box<MemoryReporter + Send>),
-
-    /// Unregister a MemoryReporter with the memory profiler. The String must match the name given
-    /// when the reporter was registered. If the String does not match the name of a registered
-    /// reporter a panic will occur.
-    UnregisterMemoryReporter(String),
-
-    /// Triggers printing of the memory profiling metrics.
-    Print,
-
-    /// Tells the memory profiler to shut down.
-    Exit,
-}
-
-pub struct MemoryProfiler {
-    /// The port through which messages are received.
-    pub port: Receiver<MemoryProfilerMsg>,
-
-    /// Registered memory reporters.
-    reporters: HashMap<String, Box<MemoryReporter + Send>>,
-}
-
-impl MemoryProfiler {
-    pub fn create(period: Option<f64>) -> MemoryProfilerChan {
-        let (chan, port) = channel();
-
-        // Create the timer thread if a period was provided.
-        if let Some(period) = period {
-            let period_ms = Duration::milliseconds((period * 1000f64) as i64);
-            let chan = chan.clone();
-            spawn_named("Memory profiler timer".to_owned(), move || {
-                loop {
-                    sleep(period_ms);
-                    if chan.send(MemoryProfilerMsg::Print).is_err() {
-                        break;
-                    }
-                }
-            });
-        }
-
-        // Always spawn the memory profiler. If there is no timer thread it won't receive regular
-        // `Print` events, but it will still receive the other events.
-        spawn_named("Memory profiler".to_owned(), move || {
-            let mut memory_profiler = MemoryProfiler::new(port);
-            memory_profiler.start();
-        });
-
-        let memory_profiler_chan = MemoryProfilerChan(chan);
-
-        // Register the system memory reporter, which will run on the memory profiler's own thread.
-        // It never needs to be unregistered, because as long as the memory profiler is running the
-        // system memory reporter can make measurements.
-        let system_reporter = Box::new(SystemMemoryReporter);
-        memory_profiler_chan.send(MemoryProfilerMsg::RegisterMemoryReporter("system".to_owned(),
-                                                                            system_reporter));
-
-        memory_profiler_chan
-    }
-
-    pub fn new(port: Receiver<MemoryProfilerMsg>) -> MemoryProfiler {
-        MemoryProfiler {
-            port: port,
-            reporters: HashMap::new(),
-        }
-    }
-
-    pub fn start(&mut self) {
-        loop {
-            match self.port.recv() {
-               Ok(msg) => {
-                   if !self.handle_msg(msg) {
-                       break
-                   }
-               }
-               _ => break
-            }
-        }
-    }
-
-    fn handle_msg(&mut self, msg: MemoryProfilerMsg) -> bool {
-        match msg {
-            MemoryProfilerMsg::RegisterMemoryReporter(name, reporter) => {
-                // Panic if it has already been registered.
-                let name_clone = name.clone();
-                match self.reporters.insert(name, reporter) {
-                    None => true,
-                    Some(_) =>
-                        panic!(format!("RegisterMemoryReporter: '{}' name is already in use",
-                                       name_clone)),
-                }
-            },
-
-            MemoryProfilerMsg::UnregisterMemoryReporter(name) => {
-                // Panic if it hasn't previously been registered.
-                match self.reporters.remove(&name) {
-                    Some(_) => true,
-                    None =>
-                        panic!(format!("UnregisterMemoryReporter: '{}' name is unknown", &name)),
-                }
-            },
-
-            MemoryProfilerMsg::Print => {
-                self.handle_print_msg();
-                true
-            },
-
-            MemoryProfilerMsg::Exit => false
-        }
-    }
-
-    fn handle_print_msg(&self) {
-        println!("Begin memory reports");
-        println!("|");
-
-        // Collect reports from memory reporters.
-        //
-        // This serializes the report-gathering. It might be worth creating a new scoped thread for
-        // each reporter once we have enough of them.
-        //
-        // If anything goes wrong with a reporter, we just skip it.
-        let mut forest = ReportsForest::new();
-        for reporter in self.reporters.values() {
-            let (chan, port) = channel();
-            if reporter.collect_reports(MemoryReportsChan(chan)) {
-                if let Ok(reports) = port.recv() {
-                    for report in reports.iter() {
-                        forest.insert(&report.path, report.size);
-                    }
-                }
-            }
-        }
-        forest.print();
-
-        println!("|");
-        println!("End memory reports");
-        println!("");
-    }
-}
-
-/// A collection of one or more reports with the same initial path segment. A ReportsTree
-/// containing a single node is described as "degenerate".
-struct ReportsTree {
-    /// For leaf nodes, this is the sum of the sizes of all reports that mapped to this location.
-    /// For interior nodes, this is the sum of the sizes of all its child nodes.
-    size: u64,
-
-    /// For leaf nodes, this is the count of all reports that mapped to this location.
-    /// For interor nodes, this is always zero.
-    count: u32,
-
-    /// The segment from the report path that maps to this node.
-    path_seg: String,
-
-    /// Child nodes.
-    children: Vec<ReportsTree>,
-}
-
-impl ReportsTree {
-    fn new(path_seg: String) -> ReportsTree {
-        ReportsTree {
-            size: 0,
-            count: 0,
-            path_seg: path_seg,
-            children: vec![]
-        }
-    }
-
-    // Searches the tree's children for a path_seg match, and returns the index if there is a
-    // match.
-    fn find_child(&self, path_seg: &String) -> Option<usize> {
-        for (i, child) in self.children.iter().enumerate() {
-            if child.path_seg == *path_seg {
-                return Some(i);
-            }
-        }
-        None
-    }
-
-    // Insert the path and size into the tree, adding any nodes as necessary.
-    fn insert(&mut self, path: &[String], size: u64) {
-        let mut t: &mut ReportsTree = self;
-        for path_seg in path.iter() {
-            let i = match t.find_child(&path_seg) {
-                Some(i) => i,
-                None => {
-                    let new_t = ReportsTree::new(path_seg.clone());
-                    t.children.push(new_t);
-                    t.children.len() - 1
-                },
-            };
-            let tmp = t;    // this temporary is needed to satisfy the borrow checker
-            t = &mut tmp.children[i];
-        }
-
-        t.size += size;
-        t.count += 1;
-    }
-
-    // Fill in sizes for interior nodes. Should only be done once all the reports have been
-    // inserted.
-    fn compute_interior_node_sizes(&mut self) -> u64 {
-        if !self.children.is_empty() {
-            // Interior node. Derive its size from its children.
-            if self.size != 0 {
-                // This will occur if e.g. we have paths ["a", "b"] and ["a", "b", "c"].
-                panic!("one report's path is a sub-path of another report's path");
-            }
-            for child in self.children.iter_mut() {
-                self.size += child.compute_interior_node_sizes();
-            }
-        }
-        self.size
-    }
-
-    fn print(&self, depth: i32) {
-        if !self.children.is_empty() {
-            assert_eq!(self.count, 0);
-        }
-
-        let mut indent_str = String::new();
-        for _ in range(0, depth) {
-            indent_str.push_str("   ");
-        }
-
-        let mebi = 1024f64 * 1024f64;
-        let count_str = if self.count > 1 { format!(" {}", self.count) } else { "".to_owned() };
-        println!("|{}{:8.2} MiB -- {}{}",
-                 indent_str, (self.size as f64) / mebi, self.path_seg, count_str);
-
-        for child in self.children.iter() {
-            child.print(depth + 1);
-        }
-    }
-}
-
-/// A collection of ReportsTrees. It represents the data from multiple memory reports in a form
-/// that's good to print.
-struct ReportsForest {
-    trees: HashMap<String, ReportsTree>,
-}
-
-impl ReportsForest {
-    fn new() -> ReportsForest {
-        ReportsForest {
-            trees: HashMap::new(),
-        }
-    }
-
-    // Insert the path and size into the forest, adding any trees and nodes as necessary.
-    fn insert(&mut self, path: &[String], size: u64) {
-        // Get the right tree, creating it if necessary.
-        if !self.trees.contains_key(&path[0]) {
-            self.trees.insert(path[0].clone(), ReportsTree::new(path[0].clone()));
-        }
-        let t = self.trees.get_mut(&path[0]).unwrap();
-
-        // Use tail() because the 0th path segment was used to find the right tree in the forest.
-        t.insert(path.tail(), size);
-    }
-
-    fn print(&mut self) {
-        // Fill in sizes of interior nodes.
-        for (_, tree) in self.trees.iter_mut() {
-            tree.compute_interior_node_sizes();
-        }
-
-        // Put the trees into a sorted vector. Primary sort: degenerate trees (those containing a
-        // single node) come after non-degenerate trees. Secondary sort: alphabetical order of the
-        // root node's path_seg.
-        let mut v = vec![];
-        for (_, tree) in self.trees.iter() {
-            v.push(tree);
-        }
-        v.sort_by(|a, b| {
-            if a.children.is_empty() && !b.children.is_empty() {
-                Ordering::Greater
-            } else if !a.children.is_empty() && b.children.is_empty() {
-                Ordering::Less
-            } else {
-                a.path_seg.cmp(&b.path_seg)
-            }
-        });
-
-        // Print the forest.
-        for tree in v.iter() {
-            tree.print(0);
-            // Print a blank line after non-degenerate trees.
-            if !tree.children.is_empty() {
-                println!("|");
-            }
-        }
-    }
-}
-
-//---------------------------------------------------------------------------
-
-/// Collects global measurements from the OS and heap allocators.
-struct SystemMemoryReporter;
-
-impl MemoryReporter for SystemMemoryReporter {
-    fn collect_reports(&self, reports_chan: MemoryReportsChan) -> bool {
-        let mut reports = vec![];
-        {
-            let mut report = |path, size| {
-                if let Some(size) = size {
-                    reports.push(MemoryReport { path: path, size: size });
-                }
-            };
-
-            // Virtual and physical memory usage, as reported by the OS.
-            report(path!["vsize"], get_vsize());
-            report(path!["resident"], get_resident());
-
-            // Memory segments, as reported by the OS.
-            for seg in get_resident_segments().iter() {
-                report(path!["resident-according-to-smaps".to_owned(), seg.0.to_owned()],
-                       Some(seg.1));
-            }
-
-            // Total number of bytes allocated by the application on the system
-            // heap.
-            report(path!["system-heap-allocated".to_owned()], get_system_heap_allocated());
-
-            // The descriptions of the following jemalloc measurements are taken
-            // directly from the jemalloc documentation.
-
-            // "Total number of bytes allocated by the application."
-            report(path!["jemalloc-heap-allocated".to_owned()],
-                   get_jemalloc_stat("stats.allocated"));
-
-            // "Total number of bytes in active pages allocated by the application.
-            // This is a multiple of the page size, and greater than or equal to
-            // |stats.allocated|."
-            report(path!["jemalloc-heap-active"], get_jemalloc_stat("stats.active"));
-
-            // "Total number of bytes in chunks mapped on behalf of the application.
-            // This is a multiple of the chunk size, and is at least as large as
-            // |stats.active|. This does not include inactive chunks."
-            report(path!["jemalloc-heap-mapped"], get_jemalloc_stat("stats.mapped"));
-        }
-        reports_chan.send(reports);
-
-        true
-    }
-}
-
-
-#[cfg(target_os="linux")]
-extern {
-    fn mallinfo() -> struct_mallinfo;
-}
-
-#[cfg(target_os="linux")]
-#[repr(C)]
-pub struct struct_mallinfo {
-    arena:    c_int,
-    ordblks:  c_int,
-    smblks:   c_int,
-    hblks:    c_int,
-    hblkhd:   c_int,
-    usmblks:  c_int,
-    fsmblks:  c_int,
-    uordblks: c_int,
-    fordblks: c_int,
-    keepcost: c_int,
-}
-
-#[cfg(target_os="linux")]
-fn get_system_heap_allocated() -> Option<u64> {
-    let mut info: struct_mallinfo;
-    unsafe {
-        info = mallinfo();
-    }
-    // The documentation in the glibc man page makes it sound like |uordblks|
-    // would suffice, but that only gets the small allocations that are put in
-    // the brk heap. We need |hblkhd| as well to get the larger allocations
-    // that are mmapped.
-    Some((info.hblkhd + info.uordblks) as u64)
-}
-
-#[cfg(not(target_os="linux"))]
-fn get_system_heap_allocated() -> Option<u64> {
-    None
-}
-
-extern {
-    fn je_mallctl(name: *const c_char, oldp: *mut c_void, oldlenp: *mut size_t,
-                  newp: *mut c_void, newlen: size_t) -> c_int;
-}
-
-fn get_jemalloc_stat(value_name: &str) -> Option<u64> {
-    // Before we request the measurement of interest, we first send an "epoch"
-    // request. Without that jemalloc gives cached statistics(!) which can be
-    // highly inaccurate.
-    let epoch_name = "epoch";
-    let epoch_c_name = CString::new(epoch_name).unwrap();
-    let mut epoch: u64 = 0;
-    let epoch_ptr = &mut epoch as *mut _ as *mut c_void;
-    let mut epoch_len = size_of::<u64>() as size_t;
-
-    let value_c_name = CString::new(value_name).unwrap();
-    let mut value: size_t = 0;
-    let value_ptr = &mut value as *mut _ as *mut c_void;
-    let mut value_len = size_of::<size_t>() as size_t;
-
-    // Using the same values for the `old` and `new` parameters is enough
-    // to get the statistics updated.
-    let rv = unsafe {
-        je_mallctl(epoch_c_name.as_ptr(), epoch_ptr, &mut epoch_len, epoch_ptr,
-                   epoch_len)
-    };
-    if rv != 0 {
-        return None;
-    }
-
-    let rv = unsafe {
-        je_mallctl(value_c_name.as_ptr(), value_ptr, &mut value_len,
-                   null_mut(), 0)
-    };
-    if rv != 0 {
-        return None;
-    }
-
-    Some(value as u64)
-}
-
-// Like std::macros::try!, but for Option<>.
-macro_rules! option_try(
-    ($e:expr) => (match $e { Some(e) => e, None => return None })
-);
-
-#[cfg(target_os="linux")]
-fn get_proc_self_statm_field(field: usize) -> Option<u64> {
-    use std::fs::File;
-    use std::io::Read;
-
-    let mut f = option_try!(File::open("/proc/self/statm").ok());
-    let mut contents = String::new();
-    option_try!(f.read_to_string(&mut contents).ok());
-    let s = option_try!(contents.words().nth(field));
-    let npages = option_try!(s.parse::<u64>().ok());
-    Some(npages * (::std::env::page_size() as u64))
-}
-
-#[cfg(target_os="linux")]
-fn get_vsize() -> Option<u64> {
-    get_proc_self_statm_field(0)
-}
-
-#[cfg(target_os="linux")]
-fn get_resident() -> Option<u64> {
-    get_proc_self_statm_field(1)
-}
-
-#[cfg(target_os="macos")]
-fn get_vsize() -> Option<u64> {
-    virtual_size()
-}
-
-#[cfg(target_os="macos")]
-fn get_resident() -> Option<u64> {
-    resident_size()
-}
-
-#[cfg(not(any(target_os="linux", target_os = "macos")))]
-fn get_vsize() -> Option<u64> {
-    None
-}
-
-#[cfg(not(any(target_os="linux", target_os = "macos")))]
-fn get_resident() -> Option<u64> {
-    None
-}
-
-#[cfg(target_os="linux")]
-fn get_resident_segments() -> Vec<(String, u64)> {
-    use regex::Regex;
-    use std::collections::HashMap;
-    use std::collections::hash_map::Entry;
-    use std::fs::File;
-    use std::io::{BufReader, BufReadExt};
-
-    // The first line of an entry in /proc/<pid>/smaps looks just like an entry
-    // in /proc/<pid>/maps:
-    //
-    //   address           perms offset  dev   inode  pathname
-    //   02366000-025d8000 rw-p 00000000 00:00 0      [heap]
-    //
-    // Each of the following lines contains a key and a value, separated
-    // by ": ", where the key does not contain either of those characters.
-    // For example:
-    //
-    //   Rss:           132 kB
-
-    let f = match File::open("/proc/self/smaps") {
-        Ok(f) => BufReader::new(f),
-        Err(_) => return vec![],
-    };
-
-    let seg_re = Regex::new(
-        r"^[:xdigit:]+-[:xdigit:]+ (....) [:xdigit:]+ [:xdigit:]+:[:xdigit:]+ \d+ +(.*)").unwrap();
-    let rss_re = Regex::new(r"^Rss: +(\d+) kB").unwrap();
-
-    // We record each segment's resident size.
-    let mut seg_map: HashMap<String, u64> = HashMap::new();
-
-    #[derive(PartialEq)]
-    enum LookingFor { Segment, Rss }
-    let mut looking_for = LookingFor::Segment;
-
-    let mut curr_seg_name = String::new();
-
-    // Parse the file.
-    for line in f.lines() {
-        let line = match line {
-            Ok(line) => line,
-            Err(_) => continue,
-        };
-        if looking_for == LookingFor::Segment {
-            // Look for a segment info line.
-            let cap = match seg_re.captures(line.as_slice()) {
-                Some(cap) => cap,
-                None => continue,
-            };
-            let perms = cap.at(1).unwrap();
-            let pathname = cap.at(2).unwrap();
-
-            // Construct the segment name from its pathname and permissions.
-            curr_seg_name.clear();
-            if pathname == "" || pathname.starts_with("[stack:") {
-                // Anonymous memory. Entries marked with "[stack:nnn]"
-                // look like thread stacks but they may include other
-                // anonymous mappings, so we can't trust them and just
-                // treat them as entirely anonymous.
-                curr_seg_name.push_str("anonymous");
-            } else {
-                curr_seg_name.push_str(pathname);
-            }
-            curr_seg_name.push_str(" (");
-            curr_seg_name.push_str(perms);
-            curr_seg_name.push_str(")");
-
-            looking_for = LookingFor::Rss;
-        } else {
-            // Look for an "Rss:" line.
-            let cap = match rss_re.captures(line.as_slice()) {
-                Some(cap) => cap,
-                None => continue,
-            };
-            let rss = cap.at(1).unwrap().parse::<u64>().unwrap() * 1024;
-
-            if rss > 0 {
-                // Aggregate small segments into "other".
-                let seg_name = if rss < 512 * 1024 {
-                    "other".to_owned()
-                } else {
-                    curr_seg_name.clone()
-                };
-                match seg_map.entry(seg_name) {
-                    Entry::Vacant(entry) => { entry.insert(rss); },
-                    Entry::Occupied(mut entry) => *entry.get_mut() += rss,
-                }
-            }
-
-            looking_for = LookingFor::Segment;
-        }
-    }
-
-    let mut segs: Vec<(String, u64)> = seg_map.into_iter().collect();
-
-    // Note that the sum of all these segments' RSS values differs from the "resident" measurement
-    // obtained via /proc/<pid>/statm in get_resident(). It's unclear why this difference occurs;
-    // for some processes the measurements match, but for Servo they do not.
-    segs.sort_by(|&(_, rss1), &(_, rss2)| rss2.cmp(&rss1));
-
-    segs
-}
-
-#[cfg(not(target_os="linux"))]
-fn get_resident_segments() -> Vec<(String, u64)> {
-    vec![]
-}
-
diff --git a/ports/cef/Cargo.lock b/ports/cef/Cargo.lock
index 555abedf97c..c7152667053 100644
--- a/ports/cef/Cargo.lock
+++ b/ports/cef/Cargo.lock
@@ -99,6 +99,7 @@ dependencies = [
  "msg 0.0.1",
  "net 0.0.1",
  "png 0.1.0 (git+https://github.com/servo/rust-png)",
+ "profile 0.0.1",
  "script_traits 0.0.1",
  "time 0.1.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "url 0.2.23 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -314,6 +315,7 @@ dependencies = [
  "net 0.0.1",
  "plugins 0.0.1",
  "png 0.1.0 (git+https://github.com/servo/rust-png)",
+ "profile 0.0.1",
  "rustc-serialize 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "script_traits 0.0.1",
  "skia 0.0.20130412 (git+https://github.com/servo/skia?branch=upstream-2014-06-16)",
@@ -516,6 +518,7 @@ dependencies = [
  "net 0.0.1",
  "plugins 0.0.1",
  "png 0.1.0 (git+https://github.com/servo/rust-png)",
+ "profile 0.0.1",
  "rustc-serialize 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "script 0.0.1",
  "script_traits 0.0.1",
@@ -534,6 +537,7 @@ dependencies = [
  "gfx 0.0.1",
  "msg 0.0.1",
  "net 0.0.1",
+ "profile 0.0.1",
  "script_traits 0.0.1",
  "url 0.2.23 (registry+https://github.com/rust-lang/crates.io-index)",
  "util 0.0.1",
@@ -615,6 +619,7 @@ dependencies = [
  "hyper 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "openssl 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "png 0.1.0 (git+https://github.com/servo/rust-png)",
+ "profile 0.0.1",
  "regex 0.1.18 (registry+https://github.com/rust-lang/crates.io-index)",
  "regex_macros 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-serialize 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -704,6 +709,18 @@ version = "1.6.16"
 source = "git+https://github.com/servo/rust-png#1d9c59c97598014860077f372443ae98b35ff4d9"
 
 [[package]]
+name = "profile"
+version = "0.0.1"
+dependencies = [
+ "libc 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex 0.1.18 (registry+https://github.com/rust-lang/crates.io-index)",
+ "task_info 0.0.1",
+ "time 0.1.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "url 0.2.23 (registry+https://github.com/rust-lang/crates.io-index)",
+ "util 0.0.1",
+]
+
+[[package]]
 name = "rand"
 version = "0.1.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -748,6 +765,7 @@ dependencies = [
  "msg 0.0.1",
  "net 0.0.1",
  "plugins 0.0.1",
+ "profile 0.0.1",
  "rustc-serialize 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "script_traits 0.0.1",
  "selectors 0.1.0 (git+https://github.com/servo/rust-selectors)",
@@ -798,6 +816,7 @@ dependencies = [
  "msg 0.0.1",
  "net 0.0.1",
  "png 0.1.0 (git+https://github.com/servo/rust-png)",
+ "profile 0.0.1",
  "script 0.0.1",
  "time 0.1.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "url 0.2.23 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -912,15 +931,12 @@ dependencies = [
  "libc 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "plugins 0.0.1",
  "rand 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "regex 0.1.18 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-serialize 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "selectors 0.1.0 (git+https://github.com/servo/rust-selectors)",
  "string_cache 0.0.0 (git+https://github.com/servo/string-cache)",
  "string_cache_plugin 0.0.0 (git+https://github.com/servo/string-cache)",
- "task_info 0.0.1",
  "text_writer 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "time 0.1.19 (registry+https://github.com/rust-lang/crates.io-index)",
- "url 0.2.23 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
diff --git a/ports/gonk/Cargo.lock b/ports/gonk/Cargo.lock
index 47ec887aa88..7dcc0a6d7b9 100644
--- a/ports/gonk/Cargo.lock
+++ b/ports/gonk/Cargo.lock
@@ -77,6 +77,7 @@ dependencies = [
  "msg 0.0.1",
  "net 0.0.1",
  "png 0.1.0 (git+https://github.com/servo/rust-png)",
+ "profile 0.0.1",
  "script_traits 0.0.1",
  "time 0.1.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "url 0.2.23 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -284,6 +285,7 @@ dependencies = [
  "net 0.0.1",
  "plugins 0.0.1",
  "png 0.1.0 (git+https://github.com/servo/rust-png)",
+ "profile 0.0.1",
  "rustc-serialize 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "script_traits 0.0.1",
  "skia 0.0.20130412 (git+https://github.com/servo/skia?branch=upstream-2014-06-16)",
@@ -440,6 +442,7 @@ dependencies = [
  "net 0.0.1",
  "plugins 0.0.1",
  "png 0.1.0 (git+https://github.com/servo/rust-png)",
+ "profile 0.0.1",
  "rustc-serialize 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "script 0.0.1",
  "script_traits 0.0.1",
@@ -458,6 +461,7 @@ dependencies = [
  "gfx 0.0.1",
  "msg 0.0.1",
  "net 0.0.1",
+ "profile 0.0.1",
  "script_traits 0.0.1",
  "url 0.2.23 (registry+https://github.com/rust-lang/crates.io-index)",
  "util 0.0.1",
@@ -539,6 +543,7 @@ dependencies = [
  "hyper 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "openssl 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "png 0.1.0 (git+https://github.com/servo/rust-png)",
+ "profile 0.0.1",
  "regex 0.1.18 (registry+https://github.com/rust-lang/crates.io-index)",
  "regex_macros 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-serialize 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -628,6 +633,18 @@ version = "1.6.16"
 source = "git+https://github.com/servo/rust-png#1d9c59c97598014860077f372443ae98b35ff4d9"
 
 [[package]]
+name = "profile"
+version = "0.0.1"
+dependencies = [
+ "libc 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex 0.1.18 (registry+https://github.com/rust-lang/crates.io-index)",
+ "task_info 0.0.1",
+ "time 0.1.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "url 0.2.23 (registry+https://github.com/rust-lang/crates.io-index)",
+ "util 0.0.1",
+]
+
+[[package]]
 name = "rand"
 version = "0.1.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -672,6 +689,7 @@ dependencies = [
  "msg 0.0.1",
  "net 0.0.1",
  "plugins 0.0.1",
+ "profile 0.0.1",
  "rustc-serialize 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "script_traits 0.0.1",
  "selectors 0.1.0 (git+https://github.com/servo/rust-selectors)",
@@ -721,6 +739,7 @@ dependencies = [
  "msg 0.0.1",
  "net 0.0.1",
  "png 0.1.0 (git+https://github.com/servo/rust-png)",
+ "profile 0.0.1",
  "script 0.0.1",
  "time 0.1.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "url 0.2.23 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -827,15 +846,12 @@ dependencies = [
  "libc 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "plugins 0.0.1",
  "rand 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "regex 0.1.18 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-serialize 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "selectors 0.1.0 (git+https://github.com/servo/rust-selectors)",
  "string_cache 0.0.0 (git+https://github.com/servo/string-cache)",
  "string_cache_plugin 0.0.0 (git+https://github.com/servo/string-cache)",
- "task_info 0.0.1",
  "text_writer 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "time 0.1.19 (registry+https://github.com/rust-lang/crates.io-index)",
- "url 0.2.23 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
diff --git a/ports/gonk/Cargo.toml b/ports/gonk/Cargo.toml
index 5889da21f27..4ab7d59b377 100644
--- a/ports/gonk/Cargo.toml
+++ b/ports/gonk/Cargo.toml
@@ -36,6 +36,9 @@ path = "../../components/devtools"
 path = "../../components/servo"
 default-features = false
 
+[dependencies.profile]
+path = "../../components/profile"
+
 [dependencies.util]
 path = "../../components/util"
 
diff --git a/ports/gonk/src/lib.rs b/ports/gonk/src/lib.rs
index 4e7152ea6b8..431f340d697 100644
--- a/ports/gonk/src/lib.rs
+++ b/ports/gonk/src/lib.rs
@@ -22,6 +22,7 @@ extern crate script;
 extern crate layout;
 extern crate gfx;
 extern crate libc;
+extern crate profile;
 extern crate url;
 
 use compositing::CompositorEventListener;
@@ -45,9 +46,9 @@ use net::resource_task::new_resource_task;
 #[cfg(not(test))]
 use gfx::font_cache_task::FontCacheTask;
 #[cfg(not(test))]
-use util::time::TimeProfiler;
+use profile::mem::MemoryProfiler;
 #[cfg(not(test))]
-use util::memory::MemoryProfiler;
+use profile::time::TimeProfiler;
 #[cfg(not(test))]
 use util::opts;
 #[cfg(not(test))]