cppgc: Change histograms from ms to us

Bug: chromium:1056170
Change-Id: Iaa3cefc652657246fffe7998dd8faa9d008d9195
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2652496
Commit-Queue: Omer Katz <omerkatz@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72370}

src/heap/cppgc/metric-recorder.h

@@ -21,14 +21,14 @@ class StatsCollector;
 class MetricRecorder {
  public:
   struct CppGCCycleEndMetricSamples {
-    int64_t atomic_mark_ms;
-    int64_t atomic_weak_ms;
-    int64_t atomic_compact_ms;
-    int64_t atomic_sweep_ms;
-    int64_t incremental_mark_ms;
-    int64_t incremental_sweep_ms;
-    int64_t concurrent_mark_ms;
-    int64_t concurrent_sweep_ms;
+    int64_t atomic_mark_us;
+    int64_t atomic_weak_us;
+    int64_t atomic_compact_us;
+    int64_t atomic_sweep_us;
+    int64_t incremental_mark_us;
+    int64_t incremental_sweep_us;
+    int64_t concurrent_mark_us;
+    int64_t concurrent_sweep_us;
 
     int64_t objects_before_bytes;
     int64_t objects_after_bytes;
@@ -39,11 +39,11 @@ class MetricRecorder {
   };
 
   struct CppGCIncrementalMarkMetricSample {
-    int64_t duration_ms;
+    int64_t duration_us;
   };
 
   struct CppGCIncrementalSweepMetricSample {
-    int64_t duration_ms;
+    int64_t duration_us;
   };
 
   virtual ~MetricRecorder() = default;

src/heap/cppgc/stats-collector.cc

@@ -130,12 +130,12 @@ void StatsCollector::NotifySweepingCompleted() {
   current_ = Event();
   if (metric_recorder_) {
     MetricRecorder::CppGCCycleEndMetricSamples event{
-        previous_.scope_data[kAtomicMark].InMilliseconds(),
-        previous_.scope_data[kAtomicWeak].InMilliseconds(),
-        previous_.scope_data[kAtomicCompact].InMilliseconds(),
-        previous_.scope_data[kAtomicSweep].InMilliseconds(),
-        previous_.scope_data[kIncrementalMark].InMilliseconds(),
-        previous_.scope_data[kIncrementalSweep].InMilliseconds(),
+        previous_.scope_data[kAtomicMark].InMicroseconds(),
+        previous_.scope_data[kAtomicWeak].InMicroseconds(),
+        previous_.scope_data[kAtomicCompact].InMicroseconds(),
+        previous_.scope_data[kAtomicSweep].InMicroseconds(),
+        previous_.scope_data[kIncrementalMark].InMicroseconds(),
+        previous_.scope_data[kIncrementalSweep].InMicroseconds(),
         previous_.concurrent_scope_data[kConcurrentMark],
         previous_.concurrent_scope_data[kConcurrentSweep],
         previous_.object_size_before_sweep_bytes /* objects_before */,
@@ -176,13 +176,13 @@ void StatsCollector::RecordHistogramSample(ScopeId scope_id_,
   switch (scope_id_) {
     case kIncrementalMark: {
       MetricRecorder::CppGCIncrementalMarkMetricSample event{
-          time.InMilliseconds()};
+          time.InMicroseconds()};
       metric_recorder_->AddMainThreadEvent(event);
       break;
     }
     case kIncrementalSweep: {
       MetricRecorder::CppGCIncrementalSweepMetricSample event{
-          time.InMilliseconds()};
+          time.InMicroseconds()};
       metric_recorder_->AddMainThreadEvent(event);
       break;
     }

src/heap/cppgc/stats-collector.h

@@ -425,11 +425,11 @@ void StatsCollector::InternalScope<trace_category,
   }
   // scope_category == StatsCollector::ScopeContext::kConcurrentThread
   using Atomic32 = v8::base::Atomic32;
-  const int64_t ms = time.InMicroseconds();
-  DCHECK(ms <= std::numeric_limits<Atomic32>::max());
+  const int64_t us = time.InMicroseconds();
+  DCHECK_LE(us, std::numeric_limits<Atomic32>::max());
   v8::base::Relaxed_AtomicIncrement(
       &stats_collector_->current_.concurrent_scope_data[scope_id_],
-      static_cast<Atomic32>(ms));
+      static_cast<Atomic32>(us));
 }
 
 }  // namespace internal