Report ConsumeWorkerMetrics at slot transitions

- Save the slot# while reporting in order to track
slot transitions.
- Remove the interval as it is not needed anymore.

Fixes: #478

core/src/banking_stage/consume_worker.rs

@@ -8,7 +8,7 @@ use {
     solana_measure::measure_us,
     solana_poh::leader_bank_notifier::LeaderBankNotifier,
     solana_runtime::bank::Bank,
-    solana_sdk::timing::AtomicInterval,
+    solana_sdk::clock::Slot,
     solana_svm::transaction_error_metrics::TransactionErrorMetrics,
     std::{
         sync::{
@@ -170,21 +170,31 @@ fn try_drain_iter<T>(work: T, receiver: &Receiver<T>) -> impl Iterator<Item = T>
 /// done.
 pub(crate) struct ConsumeWorkerMetrics {
     id: String,
-    interval: AtomicInterval,
     has_data: AtomicBool,
+    slot: AtomicU64,
 
     count_metrics: ConsumeWorkerCountMetrics,
     error_metrics: ConsumeWorkerTransactionErrorMetrics,
     timing_metrics: ConsumeWorkerTimingMetrics,
 }
 
 impl ConsumeWorkerMetrics {
-    /// Report and reset metrics iff the interval has elapsed and the worker did some work.
-    pub fn maybe_report_and_reset(&self) {
-        const REPORT_INTERVAL_MS: u64 = 1000;
-        if self.interval.should_update(REPORT_INTERVAL_MS)
-            && self.has_data.swap(false, Ordering::Relaxed)
-        {
+    /// Report and reset metrics when the worker did some work and:
+    /// a) (when a leader) Previous slot is not the same as current.
+    /// b) (when not a leader) report the metrics accumulated so far.
+    pub fn maybe_report_and_reset(&self, slot: Option<Slot>) {
+        if let Some(slot) = slot {
+            let prev_slot_id: u64 = self.slot.load(Ordering::Relaxed);
+            if slot != prev_slot_id {
+                if !self.has_data.swap(false, Ordering::Relaxed) {
+                    return;
+                }
+                self.count_metrics.report_and_reset(&self.id);
+                self.timing_metrics.report_and_reset(&self.id);
+                self.error_metrics.report_and_reset(&self.id);
+                self.slot.swap(slot, Ordering::Relaxed);
+            }
+        } else {
             self.count_metrics.report_and_reset(&self.id);
             self.timing_metrics.report_and_reset(&self.id);
             self.error_metrics.report_and_reset(&self.id);
@@ -194,8 +204,8 @@ impl ConsumeWorkerMetrics {
     fn new(id: u32) -> Self {
         Self {
             id: id.to_string(),
-            interval: AtomicInterval::default(),
             has_data: AtomicBool::new(false),
+            slot: AtomicU64::new(0),
             count_metrics: ConsumeWorkerCountMetrics::default(),
             error_metrics: ConsumeWorkerTransactionErrorMetrics::default(),
             timing_metrics: ConsumeWorkerTimingMetrics::default(),

core/src/banking_stage/transaction_scheduler/scheduler_controller.rs

@@ -140,7 +140,7 @@ impl<T: LikeClusterInfo> SchedulerController<T> {
                 .maybe_report_and_reset_interval(should_report);
             self.worker_metrics
                 .iter()
-                .for_each(|metrics| metrics.maybe_report_and_reset());
+                .for_each(|metrics| metrics.maybe_report_and_reset(new_leader_slot));
         }
 
         Ok(())