Cleanup and add more inspection to hawktracer

Cargo.toml

@@ -49,7 +49,7 @@ desync_finder = ["backtrace"]
 bench = []
 check_asm = []
 capi = ["scan_fmt"]
-tracing = ["rust_hawktracer/profiling_enabled"]
+tracing = ["rust_hawktracer/profiling_enabled", "rust_hawktracer/pkg_config"]
 scenechange = []
 serialize = ["serde", "toml", "v_frame/serialize", "serde-big-array"]
 wasm = ["wasm-bindgen"]

doc/PROFILING.md

@@ -73,6 +73,10 @@ We use [rust\_hawktracer](https://github.com/AlexEne/rust_hawktracer) to
 measure specific codepath timings. Building `--features=tracing` enables it.
 Use the standard [hawktrace-convert](https://hawktracer.org) to produce graphs.
 
+Currently there are issues where rust_hawktracer fails to build, as a result
+we have set it to use the system hawktracer library. On Arch Linux this may
+be installed from the AUR package hawktracer-git.
+
 ## Codegen Inspection
 
 ### Assembly

src/activity.rs

@@ -20,7 +20,7 @@ pub struct ActivityMask {
 }
 
 impl ActivityMask {
-  #[hawktracer(activity_mask_from_plane)]
+  #[hawktracer(ActivityMask_from_plane)]
   pub fn from_plane<T: Pixel>(luma_plane: &Plane<T>) -> ActivityMask {
     let PlaneConfig { width, height, .. } = luma_plane.cfg;
 
@@ -55,7 +55,7 @@ impl ActivityMask {
     ActivityMask { variances: variances.into_boxed_slice() }
   }
 
-  #[hawktracer(activity_mask_fill_scales)]
+  #[hawktracer(ActivityMask_fill_scales)]
   pub fn fill_scales(
     &self, bit_depth: usize, activity_scales: &mut Box<[DistortionScale]>,
   ) {