Switch self profile to use HW counters instead of walltime

Author: Kobzol

collector/src/bin/rustc-fake.rs

@@ -119,6 +119,7 @@ fn main() {
                 let prof_out_dir = create_self_profile_dir();
                 if wrapper == "PerfStatSelfProfile" {
                     cmd.arg(format!("-Zself-profile={}", prof_out_dir.to_str().unwrap()));
+                    cmd.arg("-Zself-profile-counter=instructions:u");
                     let _ = fs::remove_dir_all(&prof_out_dir);
                     let _ = fs::create_dir_all(&prof_out_dir);
                 }

site/src/request_handlers/self_profile.rs

@@ -460,7 +460,7 @@ pub async fn handle_self_profile(
         .benchmark(selector::Selector::One(bench_name.to_string()))
         .profile(selector::Selector::One(profile.parse().unwrap()))
         .scenario(selector::Selector::One(scenario))
-        .metric(selector::Selector::One(Metric::CpuClock));
+        .metric(selector::Selector::One(Metric::InstructionsUser));
 
     // Helper for finding an `ArtifactId` based on a commit sha
     let find_aid = |commit: &str| {