AcctIdx: metric for bucket grow time (#20445)

runtime/src/bucket_map_holder_stats.rs

@@ -39,6 +39,7 @@ pub struct BucketMapHolderStats {
     pub flush_scan_us: AtomicU64,
     pub flush_update_us: AtomicU64,
     pub flush_remove_us: AtomicU64,
+    pub flush_grow_us: AtomicU64,
     last_time: AtomicInterval,
 }
 
@@ -233,6 +234,11 @@ impl BucketMapHolderStats {
                 self.flush_update_us.swap(0, Ordering::Relaxed),
                 i64
             ),
+            (
+                "flush_grow_us",
+                self.flush_remove_us.swap(0, Ordering::Relaxed),
+                i64
+            ),
             (
                 "flush_remove_us",
                 self.flush_remove_us.swap(0, Ordering::Relaxed),

runtime/src/in_mem_accounts_index.rs

@@ -729,7 +729,7 @@ impl<T: IndexValue> InMemAccountsIndex<T> {
                 );
             }
 
-            let m = Measure::start("flush_remove");
+            let m = Measure::start("flush_remove_or_grow");
             match disk_resize {
                 Ok(_) => {
                     if !self.flush_remove_from_cache(removes, current_age, startup, false) {
@@ -751,6 +751,7 @@ impl<T: IndexValue> InMemAccountsIndex<T> {
                     // grow the bucket, outside of all in-mem locks.
                     // then, loop to try again
                     disk.grow(err);
+                    Self::update_time_stat(&self.stats().flush_grow_us, m);
                 }
             }
         }