Rollup merge of rust-lang#58309 - wesleywiser:add_more_profiler_events, r=michaelwoerister

Add more profiler events

- Adds Start\Stop events for time spent loading incremental query results from disk.

- Adds Start\Stop events for time spent blocked waiting for queries to complete (when parallel queries are enabled).

r? @michaelwoerister

Author: Centril

src/librustc/ty/query/plumbing.rs

@@ -124,7 +124,15 @@ impl<'a, 'tcx, Q: QueryDescription<'tcx>> JobOwner<'a, 'tcx, Q> {
             let job = match lock.active.entry((*key).clone()) {
                 Entry::Occupied(entry) => {
                     match *entry.get() {
-                        QueryResult::Started(ref job) => job.clone(),
+                        QueryResult::Started(ref job) => {
+                            //For parallel queries, we'll block and wait until the query running
+                            //in another thread has completed. Record how long we wait in the
+                            //self-profiler
+                            #[cfg(parallel_compiler)]
+                            tcx.sess.profiler(|p| p.query_blocked_start(Q::NAME, Q::CATEGORY));
+
+                            job.clone()
+                        },
                         QueryResult::Poisoned => FatalError.raise(),
                     }
                 }
@@ -160,7 +168,10 @@ impl<'a, 'tcx, Q: QueryDescription<'tcx>> JobOwner<'a, 'tcx, Q> {
             // thread
             #[cfg(parallel_compiler)]
             {
-                if let Err(cycle) = job.r#await(tcx, span) {
+                let result = job.r#await(tcx, span);
+                tcx.sess.profiler(|p| p.query_blocked_end(Q::NAME, Q::CATEGORY));
+
+                if let Err(cycle) = result {
                     return TryGetJob::JobCompleted(Err(cycle));
                 }
             }
@@ -441,7 +452,9 @@ impl<'a, 'gcx, 'tcx> TyCtxt<'a, 'gcx, 'tcx> {
         // First we try to load the result from the on-disk cache
         let result = if Q::cache_on_disk(self.global_tcx(), key.clone()) &&
                         self.sess.opts.debugging_opts.incremental_queries {
+            self.sess.profiler(|p| p.incremental_load_result_start(Q::NAME));
             let result = Q::try_load_from_disk(self.global_tcx(), prev_dep_node_index);
+            self.sess.profiler(|p| p.incremental_load_result_end(Q::NAME));
 
             // We always expect to find a cached result for things that
             // can be forced from DepNode.

src/librustc/util/profiling.rs

@@ -25,16 +25,28 @@ pub enum ProfilerEvent {
     GenericActivityEnd { category: ProfileCategory, time: Instant },
     QueryCacheHit { query_name: &'static str, category: ProfileCategory },
     QueryCount { query_name: &'static str, category: ProfileCategory, count: usize },
+    IncrementalLoadResultStart { query_name: &'static str, time: Instant },
+    IncrementalLoadResultEnd { query_name: &'static str, time: Instant },
+    QueryBlockedStart { query_name: &'static str, category: ProfileCategory, time: Instant },
+    QueryBlockedEnd { query_name: &'static str, category: ProfileCategory, time: Instant },
 }
 
 impl ProfilerEvent {
     fn is_start_event(&self) -> bool {
         use self::ProfilerEvent::*;
 
         match self {
-            QueryStart { .. } | GenericActivityStart { .. } => true,
-            QueryEnd { .. } | GenericActivityEnd { .. } |
-            QueryCacheHit { .. } | QueryCount { .. } => false,
+            QueryStart { .. } |
+            GenericActivityStart { .. } |
+            IncrementalLoadResultStart { .. } |
+            QueryBlockedStart { .. } => true,
+
+            QueryEnd { .. } |
+            GenericActivityEnd { .. } |
+            QueryCacheHit { .. } |
+            QueryCount { .. } |
+            IncrementalLoadResultEnd { .. } |
+            QueryBlockedEnd { .. } => false,
         }
     }
 }
@@ -57,12 +69,7 @@ impl CategoryResultData {
     }
 
     fn total_time(&self) -> u64 {
-        let mut total = 0;
-        for (_, time) in &self.query_times {
-            total += time;
-        }
-
-        total
+        self.query_times.iter().map(|(_, time)| time).sum()
     }
 
     fn total_cache_data(&self) -> (u64, u64) {
@@ -121,13 +128,7 @@ impl CalculatedResults {
     }
 
     fn total_time(&self) -> u64 {
-        let mut total = 0;
-
-        for (_, data) in &self.categories {
-            total += data.total_time();
-        }
-
-        total
+        self.categories.iter().map(|(_, data)| data.total_time()).sum()
     }
 
     fn with_options(mut self, opts: &Options) -> CalculatedResults {
@@ -225,6 +226,40 @@ impl SelfProfiler {
         })
     }
 
+    #[inline]
+    pub fn incremental_load_result_start(&mut self, query_name: &'static str) {
+        self.record(ProfilerEvent::IncrementalLoadResultStart {
+            query_name,
+            time: Instant::now(),
+        })
+    }
+
+    #[inline]
+    pub fn incremental_load_result_end(&mut self, query_name: &'static str) {
+        self.record(ProfilerEvent::IncrementalLoadResultEnd {
+            query_name,
+            time: Instant::now(),
+        })
+    }
+
+    #[inline]
+    pub fn query_blocked_start(&mut self, query_name: &'static str, category: ProfileCategory) {
+        self.record(ProfilerEvent::QueryBlockedStart {
+            query_name,
+            category,
+            time: Instant::now(),
+        })
+    }
+
+    #[inline]
+    pub fn query_blocked_end(&mut self, query_name: &'static str, category: ProfileCategory) {
+        self.record(ProfilerEvent::QueryBlockedEnd {
+            query_name,
+            category,
+            time: Instant::now(),
+        })
+    }
+
     #[inline]
     fn record(&mut self, event: ProfilerEvent) {
         let thread_id = std::thread::current().id();
@@ -317,6 +352,10 @@ impl SelfProfiler {
                         result_data.query_cache_stats.entry(query_name).or_insert((0, 0));
                     *totals += *count as u64;
                 },
+                //we don't summarize incremental load result events in the simple output mode
+                IncrementalLoadResultStart { .. } | IncrementalLoadResultEnd { .. } => { },
+                //we don't summarize parallel query blocking in the simple output mode
+                QueryBlockedStart { .. } | QueryBlockedEnd { .. } => { },
             }
         }
 
@@ -361,9 +400,9 @@ impl SelfProfiler {
             .unwrap();
 
         let mut categories: Vec<_> = results.categories.iter().collect();
-        categories.sort_by(|(_, data1), (_, data2)| data2.total_time().cmp(&data1.total_time()));
+        categories.sort_by_cached_key(|(_, d)| d.total_time());
 
-        for (category, data) in categories {
+        for (category, data) in categories.iter().rev() {
             let (category_hits, category_total) = data.total_cache_data();
             let category_hit_percent = calculate_percent(category_hits, category_total);