Remove support for energy profiling

15 files changed, 8 insertions, 215 deletions

diff --git a/Cargo.lock b/Cargo.lock
index 1354dbb1d7b..4c6921b4845 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1378,49 +1378,6 @@ dependencies = [
 ]
 
 [[package]]
-name = "energy-monitor"
-version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fe872d0664f1cc60db36349af245d892ee67d3c8f78055df0ebc43271fd4e05c"
-
-[[package]]
-name = "energymon"
-version = "0.3.0"
-source = "git+https://github.com/energymon/energymon-rust.git#89daf8f37858eab96ad8eec7cc81accb17b2411e"
-dependencies = [
- "energy-monitor",
- "energymon-default-sys",
- "libc",
-]
-
-[[package]]
-name = "energymon-builder"
-version = "0.3.0"
-source = "git+https://github.com/energymon/energymon-sys.git#f8d77ea2906b25f9c0fd358aa9d300a46dc3e97c"
-dependencies = [
- "cmake",
- "pkg-config",
-]
-
-[[package]]
-name = "energymon-default-sys"
-version = "0.3.0"
-source = "git+https://github.com/energymon/energymon-sys.git#f8d77ea2906b25f9c0fd358aa9d300a46dc3e97c"
-dependencies = [
- "energymon-builder",
- "energymon-sys",
- "libc",
-]
-
-[[package]]
-name = "energymon-sys"
-version = "0.3.0"
-source = "git+https://github.com/energymon/energymon-sys.git#f8d77ea2906b25f9c0fd358aa9d300a46dc3e97c"
-dependencies = [
- "libc",
-]
-
-[[package]]
 name = "enum-iterator"
 version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -4241,8 +4198,6 @@ name = "profile_traits"
 version = "0.0.1"
 dependencies = [
  "crossbeam-channel",
- "energy-monitor",
- "energymon",
  "ipc-channel",
  "log",
  "serde",
diff --git a/components/layout_thread/lib.rs b/components/layout_thread/lib.rs
index 82da02d1ce3..920345cbd47 100644
--- a/components/layout_thread/lib.rs
+++ b/components/layout_thread/lib.rs
@@ -1456,8 +1456,6 @@ impl LayoutThread {
                 &self.time_profiler_chan,
                 0,
                 text_shaping_time as u64,
-                0,
-                0,
             );
 
             // Retrieve the (possibly rebuilt) root flow.
diff --git a/components/metrics/lib.rs b/components/metrics/lib.rs
index 1165c8f45ca..ad6ef52e3ca 100644
--- a/components/metrics/lib.rs
+++ b/components/metrics/lib.rs
@@ -81,8 +81,6 @@ fn set_metric<U: ProgressiveWebMetric>(
         &pwm.get_time_profiler_chan(),
         time,
         time,
-        0,
-        0,
     );
 
     // Print the metric to console if the print-pwm option was given.
diff --git a/components/profile/README.md b/components/profile/README.md
index cc98292c03f..85cd0747b6d 100644
--- a/components/profile/README.md
+++ b/components/profile/README.md
@@ -62,31 +62,3 @@ Time is measured in nanoseconds and energy is measured in microjoules.
 `Work`, `Time`, and `Energy` also have `Global` and `Window` values which are the summed over the entire runtime and sliding window period, respectively.
 
 `Perf` (performance) and `Pwr` (power) have `Global`, `Window`, and `Instant` values as described above.
-
-
-# Energy Profiling
-
-Energy monitoring is hardware and platform-specific, so it is only enabled with the `energy-profiling` feature.
-
-To use energy profiling, you must have a compatible `energymon-default` implementation installed to your system as `energymon-default-static` when building Servo.
-Otherwise a default dummy implementation is used.
-The library is linked through a chain of dependencies:
-
-* servo::profile_traits
-  * energymon - Rust abstractions
-    * energymon-default-sys - Rust bindings to `energymon-default.h`
-      * energymon-default-static: A statically linked C library installed to the system that implements `energymon.h` and `energymon-default.h`
-
-For instructions on building existing native libraries, visit the [energymon project source](https://github.com/energymon/energymon).
-You may also write your own implementation of `energymon.h` and `energymon-default.h` and install it as `energymon-default-static` where pkg-config can find it.
-
-Once you install the proper library, you will need to rebuild the `energymon-default-sys` crate.
-The most straightforward way to do this is to do a clean build of Servo.
-
-To build Servo with the `energy-profiling` feature enabled, pass `--features "energy-profiling"` to the `mach` command, e.g.:
-
-```sh
-./mach build -r --features "energy-profiling"
-```
-
-When running Servo, you will want to enable the desired Heartbeats to record the results.
diff --git a/components/profile/time.rs b/components/profile/time.rs
index 59cc376acab..178d0473370 100644
--- a/components/profile/time.rs
+++ b/components/profile/time.rs
@@ -7,14 +7,12 @@
 use crate::heartbeats;
 use crate::trace_dump::TraceDump;
 use ipc_channel::ipc::{self, IpcReceiver};
-use profile_traits::energy::{energy_interval_ms, read_energy_uj};
 use profile_traits::time::{
     ProfilerCategory, ProfilerChan, ProfilerData, ProfilerMsg, TimerMetadata,
 };
 use profile_traits::time::{TimerMetadataFrameType, TimerMetadataReflowType};
 use servo_config::opts::OutputOptions;
 use std::borrow::ToOwned;
-use std::cmp::Ordering;
 use std::collections::{BTreeMap, HashMap};
 use std::fs::File;
 use std::io::{self, Write};
@@ -253,22 +251,15 @@ impl Profiler {
         };
         if run_ap_thread() {
             let profiler_chan = profiler_chan.clone();
-            // min of 1 heartbeat/sec, max of 20 should provide accurate enough power/energy readings
+            // min of 1 heartbeat/sec, max of 20 should provide accurate enough readings
             // waking up more frequently allows the thread to end faster on exit
             const SLEEP_MS: u32 = 10;
-            const MIN_ENERGY_INTERVAL_MS: u32 = 50;
-            const MAX_ENERGY_INTERVAL_MS: u32 = 1000;
-            let interval_ms = enforce_range(
-                MIN_ENERGY_INTERVAL_MS,
-                MAX_ENERGY_INTERVAL_MS,
-                energy_interval_ms(),
-            );
+            let interval_ms = 200;
             let loop_count: u32 = (interval_ms as f32 / SLEEP_MS as f32).ceil() as u32;
             thread::Builder::new()
                 .name("Application heartbeat profiler".to_owned())
                 .spawn(move || {
                     let mut start_time = precise_time_ns();
-                    let mut start_energy = read_energy_uj();
                     loop {
                         for _ in 0..loop_count {
                             if run_ap_thread() {
@@ -278,7 +269,6 @@ impl Profiler {
                             }
                         }
                         let end_time = precise_time_ns();
-                        let end_energy = read_energy_uj();
                         // send using the inner channel
                         // (using ProfilerChan.send() forces an unwrap
                         // and sometimes panics for this background profiler)
@@ -286,12 +276,10 @@ impl Profiler {
                         if let Err(_) = c.send(ProfilerMsg::Time(
                             (ProfilerCategory::ApplicationHeartbeat, None),
                             (start_time, end_time),
-                            (start_energy, end_energy),
                         )) {
                             return;
                         }
                         start_time = end_time;
-                        start_energy = end_energy;
                     }
                 })
                 .expect("Thread spawning failed");
@@ -331,10 +319,10 @@ impl Profiler {
 
     fn handle_msg(&mut self, msg: ProfilerMsg) -> bool {
         match msg.clone() {
-            ProfilerMsg::Time(k, t, e) => {
-                heartbeats::maybe_heartbeat(&k.0, t.0, t.1, e.0, e.1, self.profile_heartbeats);
+            ProfilerMsg::Time(k, t) => {
+                heartbeats::maybe_heartbeat(&k.0, t.0, t.1, 0, 0, self.profile_heartbeats);
                 if let Some(ref mut trace) = self.trace {
-                    trace.write_one(&k, t, e);
+                    trace.write_one(&k, t);
                 }
                 let ms = (t.1 - t.0) as f64 / 1000000f64;
                 self.find_or_insert(k, ms);
@@ -475,20 +463,6 @@ impl Profiler {
     }
 }
 
-fn enforce_range<T>(min: T, max: T, value: T) -> T
-where
-    T: Ord,
-{
-    assert!(min <= max);
-    match value.cmp(&max) {
-        Ordering::Equal | Ordering::Greater => max,
-        Ordering::Less => match value.cmp(&min) {
-            Ordering::Equal | Ordering::Less => min,
-            Ordering::Greater => value,
-        },
-    }
-}
-
 pub fn duration_from_seconds(secs: f64) -> Duration {
     pub const NANOS_PER_SEC: u32 = 1_000_000_000;
 
diff --git a/components/profile/trace_dump.rs b/components/profile/trace_dump.rs
index 896bce9cb63..2833e3bd26d 100644
--- a/components/profile/trace_dump.rs
+++ b/components/profile/trace_dump.rs
@@ -25,12 +25,6 @@ struct TraceEntry {
 
     #[serde(rename = "endTime")]
     end_time: u64,
-
-    #[serde(rename = "startEnergy")]
-    start_energy: u64,
-
-    #[serde(rename = "endEnergy")]
-    end_energy: u64,
 }
 
 impl TraceDump {
@@ -50,15 +44,12 @@ impl TraceDump {
         &mut self,
         category: &(ProfilerCategory, Option<TimerMetadata>),
         time: (u64, u64),
-        energy: (u64, u64),
     ) {
         let entry = TraceEntry {
             category: category.0,
             metadata: category.1.clone(),
             start_time: time.0,
             end_time: time.1,
-            start_energy: energy.0,
-            end_energy: energy.1,
         };
         serde_json::to_writer(&mut self.file, &entry).unwrap();
         writeln!(&mut self.file, ",").unwrap();
diff --git a/components/profile_traits/Cargo.toml b/components/profile_traits/Cargo.toml
index 118d60caa17..519170dc0c7 100644
--- a/components/profile_traits/Cargo.toml
+++ b/components/profile_traits/Cargo.toml
@@ -10,13 +10,8 @@ publish = false
 name = "profile_traits"
 path = "lib.rs"
 
-[features]
-energy-profiling = ["energy-monitor", "energymon"]
-
 [dependencies]
 crossbeam-channel = "0.4"
-energy-monitor = { version = "0.2.0", optional = true }
-energymon = { git = "https://github.com/energymon/energymon-rust.git", optional = true }
 ipc-channel = "0.14"
 log = "0.4"
 serde = "1.0"
diff --git a/components/profile_traits/energy.rs b/components/profile_traits/energy.rs
deleted file mode 100644
index 1753531b940..00000000000
--- a/components/profile_traits/energy.rs
+++ /dev/null
@@ -1,62 +0,0 @@
-/* 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 https://mozilla.org/MPL/2.0/. */
-
-#[cfg(feature = "energy-profiling")]
-pub fn read_energy_uj() -> u64 {
-    energymon::read_energy_uj()
-}
-
-#[cfg(not(feature = "energy-profiling"))]
-pub fn read_energy_uj() -> u64 {
-    0
-}
-
-#[cfg(feature = "energy-profiling")]
-pub fn energy_interval_ms() -> u32 {
-    energymon::get_min_interval_ms()
-}
-
-#[cfg(not(feature = "energy-profiling"))]
-pub fn energy_interval_ms() -> u32 {
-    1000
-}
-
-#[cfg(feature = "energy-profiling")]
-mod energymon {
-    extern crate energy_monitor;
-    extern crate energymon;
-
-    use self::energy_monitor::EnergyMonitor;
-    use self::energymon::EnergyMon;
-    use std::sync::{Once, ONCE_INIT};
-
-    static mut EM: Option<*mut EnergyMon> = None;
-
-    fn init() {
-        // can't use lazy_static macro for EM (no Sync trait for EnergyMon)
-        static ONCE: Once = ONCE_INIT;
-        ONCE.call_once(|| {
-            if let Ok(em) = EnergyMon::new() {
-                println!("Started energy monitoring from: {}", em.source());
-                unsafe {
-                    EM = Some(Box::into_raw(Box::new(em)));
-                }
-            }
-        });
-    }
-
-    /// Read energy from the energy monitor, otherwise return 0.
-    pub fn read_energy_uj() -> u64 {
-        init();
-        unsafe {
-            // EnergyMon implementations of EnergyMonitor always return a value
-            EM.map_or(0, |em| (*em).read_uj().unwrap())
-        }
-    }
-
-    pub fn get_min_interval_ms() -> u32 {
-        init();
-        unsafe { EM.map_or(0, |em| ((*em).interval_us() as f64 / 1000.0).ceil() as u32) }
-    }
-}
diff --git a/components/profile_traits/lib.rs b/components/profile_traits/lib.rs
index c1e94fa8641..7e0ce8166d0 100644
--- a/components/profile_traits/lib.rs
+++ b/components/profile_traits/lib.rs
@@ -13,8 +13,6 @@ extern crate log;
 #[macro_use]
 extern crate serde;
 
-#[allow(unsafe_code)]
-pub mod energy;
 pub mod ipc;
 pub mod mem;
 pub mod time;
diff --git a/components/profile_traits/time.rs b/components/profile_traits/time.rs
index 91a99fe18c4..043c0c4cb21 100644
--- a/components/profile_traits/time.rs
+++ b/components/profile_traits/time.rs
@@ -2,7 +2,6 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
-use crate::energy::read_energy_uj;
 use ipc_channel::ipc::IpcSender;
 use servo_config::opts;
 use time::precise_time_ns;
@@ -34,11 +33,7 @@ pub enum ProfilerData {
 #[derive(Clone, Debug, Deserialize, Serialize)]
 pub enum ProfilerMsg {
     /// Normal message used for reporting time
-    Time(
-        (ProfilerCategory, Option<TimerMetadata>),
-        (u64, u64),
-        (u64, u64),
-    ),
+    Time((ProfilerCategory, Option<TimerMetadata>), (u64, u64)),
     /// Message used to get time spend entries for a particular ProfilerBuckets (in nanoseconds)
     Get(
         (ProfilerCategory, Option<TimerMetadata>),
@@ -142,26 +137,16 @@ where
     if opts::get().signpost {
         signpost::start(category as u32, &[0, 0, 0, (category as usize) >> 4]);
     }
-    let start_energy = read_energy_uj();
     let start_time = precise_time_ns();
 
     let val = callback();
 
     let end_time = precise_time_ns();
-    let end_energy = read_energy_uj();
     if opts::get().signpost {
         signpost::end(category as u32, &[0, 0, 0, (category as usize) >> 4]);
     }
 
-    send_profile_data(
-        category,
-        meta,
-        &profiler_chan,
-        start_time,
-        end_time,
-        start_energy,
-        end_energy,
-    );
+    send_profile_data(category, meta, &profiler_chan, start_time, end_time);
     val
 }
 
@@ -171,12 +156,6 @@ pub fn send_profile_data(
     profiler_chan: &ProfilerChan,
     start_time: u64,
     end_time: u64,
-    start_energy: u64,
-    end_energy: u64,
 ) {
-    profiler_chan.send(ProfilerMsg::Time(
-        (category, meta),
-        (start_time, end_time),
-        (start_energy, end_energy),
-    ));
+    profiler_chan.send(ProfilerMsg::Time((category, meta), (start_time, end_time)));
 }
diff --git a/components/servo/Cargo.toml b/components/servo/Cargo.toml
index e7bcc1f352f..1cb332e3da9 100644
--- a/components/servo/Cargo.toml
+++ b/components/servo/Cargo.toml
@@ -14,7 +14,6 @@ crate-type = ["rlib"]
 [features]
 debugmozjs = ["script/debugmozjs"]
 egl = ["mozangle/egl"]
-energy-profiling = ["profile_traits/energy-profiling"]
 googlevr = ["webxr/googlevr"]
 jitspew = ["script/jitspew"]
 js_backtrace = ["script/js_backtrace"]
diff --git a/ports/libsimpleservo/api/Cargo.toml b/ports/libsimpleservo/api/Cargo.toml
index eb5234dc05e..9fd37846f8e 100644
--- a/ports/libsimpleservo/api/Cargo.toml
+++ b/ports/libsimpleservo/api/Cargo.toml
@@ -35,7 +35,6 @@ gl_generator = "0.14"
 debugmozjs = ["libservo/debugmozjs"]
 default = ["webdriver", "max_log_level"]
 egl = ["libservo/egl"]
-energy-profiling = ["libservo/energy-profiling"]
 googlevr = ["libservo/googlevr"]
 jitspew = ["libservo/jitspew"]
 js_backtrace = ["libservo/js_backtrace"]
diff --git a/ports/libsimpleservo/capi/Cargo.toml b/ports/libsimpleservo/capi/Cargo.toml
index db54c674e14..ff481da0672 100644
--- a/ports/libsimpleservo/capi/Cargo.toml
+++ b/ports/libsimpleservo/capi/Cargo.toml
@@ -31,7 +31,6 @@ cbindgen = "0.14"
 debugmozjs = ["simpleservo/debugmozjs"]
 default = ["webdriver", "max_log_level"]
 egl = ["simpleservo/egl"]
-energy-profiling = ["simpleservo/energy-profiling"]
 googlevr = ["simpleservo/googlevr"]
 jitspew = ["simpleservo/jitspew"]
 js_backtrace = ["simpleservo/js_backtrace"]
diff --git a/ports/libsimpleservo/jniapi/Cargo.toml b/ports/libsimpleservo/jniapi/Cargo.toml
index c86f68a9ac2..748653e1894 100644
--- a/ports/libsimpleservo/jniapi/Cargo.toml
+++ b/ports/libsimpleservo/jniapi/Cargo.toml
@@ -30,7 +30,6 @@ cc = "1.0"
 debugmozjs = ["simpleservo/debugmozjs"]
 default = ["webdriver", "max_log_level"]
 egl = ["simpleservo/egl"]
-energy-profiling = ["simpleservo/energy-profiling"]
 googlevr = ["simpleservo/googlevr"]
 js_backtrace = ["simpleservo/js_backtrace"]
 layout-2013 = ["simpleservo/layout-2013"]
diff --git a/ports/winit/Cargo.toml b/ports/winit/Cargo.toml
index 03ec4b4e2ae..1850f8acbdd 100644
--- a/ports/winit/Cargo.toml
+++ b/ports/winit/Cargo.toml
@@ -30,7 +30,6 @@ ProductName = "Servo"
 debugmozjs = ["libservo/debugmozjs"]
 default = ["webdriver", "max_log_level"]
 egl = ["libservo/egl"]
-energy-profiling = ["libservo/energy-profiling"]
 jitspew = ["libservo/jitspew"]
 js_backtrace = ["libservo/js_backtrace"]
 layout-2013 = ["libservo/layout-2013"]