std::rt: Remove metrics for perf

These aren't used for anything at the moment and cause some TLS hits
on some perf-critical code paths. Will need to put better thought into
it in the future.

Author: brson

src/libstd/rt/comm.rs

@@ -144,16 +144,8 @@ impl<T> ChanOne<T> {
             match oldstate {
                 STATE_BOTH => {
                     // Port is not waiting yet. Nothing to do
-                    do Local::borrow::<Scheduler, ()> |sched| {
-                        rtdebug!("non-rendezvous send");
-                        sched.metrics.non_rendezvous_sends += 1;
-                    }
                 }
                 STATE_ONE => {
-                    do Local::borrow::<Scheduler, ()> |sched| {
-                        rtdebug!("rendezvous send");
-                        sched.metrics.rendezvous_sends += 1;
-                    }
                     // Port has closed. Need to clean up.
                     let _packet: ~Packet<T> = cast::transmute(this.void_packet);
                     recvr_active = false;
@@ -251,7 +243,6 @@ impl<T> SelectInner for PortOne<T> {
                 STATE_BOTH => {
                     // Data has not been sent. Now we're blocked.
                     rtdebug!("non-rendezvous recv");
-                    sched.metrics.non_rendezvous_recvs += 1;
                     false
                 }
                 STATE_ONE => {
@@ -267,7 +258,6 @@ impl<T> SelectInner for PortOne<T> {
                     (*self.packet()).state.store(STATE_ONE, Relaxed);
 
                     rtdebug!("rendezvous recv");
-                    sched.metrics.rendezvous_recvs += 1;
 
                     // Channel is closed. Switch back and check the data.
                     // NB: We have to drop back into the scheduler event loop here

src/libstd/rt/metrics.rs

@@ -152,8 +152,6 @@ pub mod local_ptr;
 /// Bindings to pthread/windows thread-local storage.
 pub mod thread_local_storage;
 
-pub mod metrics;
-
 // FIXME #5248 shouldn't be pub
 /// Just stuff
 pub mod util;

src/libstd/rt/mod.rs

@@ -24,7 +24,6 @@ use rt::kill::BlockedTask;
 use rt::local_ptr;
 use rt::local::Local;
 use rt::rtio::{RemoteCallback, PausibleIdleCallback};
-use rt::metrics::SchedMetrics;
 use borrow::{to_uint};
 use cell::Cell;
 use rand::{XorShiftRng, RngUtil};
@@ -71,7 +70,6 @@ pub struct Scheduler {
     /// An action performed after a context switch on behalf of the
     /// code running before the context switch
     cleanup_job: Option<CleanupJob>,
-    metrics: SchedMetrics,
     /// Should this scheduler run any task, or only pinned tasks?
     run_anything: bool,
     /// If the scheduler shouldn't run some tasks, a friend to send
@@ -126,7 +124,6 @@ impl Scheduler {
             stack_pool: StackPool::new(),
             sched_task: None,
             cleanup_job: None,
-            metrics: SchedMetrics::new(),
             run_anything: run_anything,
             friend_handle: friend,
             rng: XorShiftRng::new(),
@@ -267,10 +264,8 @@ impl Scheduler {
         // If we got here then there was no work to do.
         // Generate a SchedHandle and push it to the sleeper list so
         // somebody can wake us up later.
-        sched.metrics.wasted_turns += 1;
         if !sched.sleepy && !sched.no_sleep {
             rtdebug!("scheduler has no work to do, going to sleep");
-            sched.metrics.sleepy_times += 1;
             sched.sleepy = true;
             let handle = sched.make_handle();
             sched.sleeper_list.push(handle);