Add limit to looping in banking-stage (#35342)

core/src/banking_stage/consumer.rs

@@ -598,7 +598,8 @@ impl Consumer {
                 transaction_status_sender_enabled,
                 &mut execute_and_commit_timings.execute_timings,
                 None, // account_overrides
-                self.log_messages_bytes_limit
+                self.log_messages_bytes_limit,
+                true,
             ));
         execute_and_commit_timings.load_execute_us = load_execute_us;
 

program-runtime/src/loaded_programs.rs

@@ -195,7 +195,7 @@ impl Stats {
             ("reloads", reloads, i64),
             ("insertions", insertions, i64),
             ("lost_insertions", lost_insertions, i64),
-            ("replacements", replacements, i64),
+            ("replace_entry", replacements, i64),
             ("one_hit_wonders", one_hit_wonders, i64),
             ("prunes_orphan", prunes_orphan, i64),
             ("prunes_environment", prunes_environment, i64),
@@ -618,6 +618,7 @@ pub struct LoadedProgramsForTxBatch {
     entries: HashMap<Pubkey, Arc<LoadedProgram>>,
     slot: Slot,
     pub environments: ProgramRuntimeEnvironments,
+    pub hit_max_limit: bool,
 }
 
 impl LoadedProgramsForTxBatch {
@@ -626,6 +627,7 @@ impl LoadedProgramsForTxBatch {
             entries: HashMap::new(),
             slot,
             environments,
+            hit_max_limit: false,
         }
     }
 
@@ -964,7 +966,7 @@ impl<FG: ForkGraph> LoadedPrograms<FG> {
         slot: Slot,
         key: Pubkey,
         loaded_program: Arc<LoadedProgram>,
-    ) {
+    ) -> bool {
         let second_level = self.entries.entry(key).or_default();
         debug_assert_eq!(
             second_level.cooperative_loading_lock,
@@ -985,8 +987,9 @@ impl<FG: ForkGraph> LoadedPrograms<FG> {
         {
             self.stats.lost_insertions.fetch_add(1, Ordering::Relaxed);
         }
-        self.assign_program(key, loaded_program);
+        let was_occupied = self.assign_program(key, loaded_program);
         self.loading_task_waiter.notify();
+        was_occupied
     }
 
     pub fn merge(&mut self, tx_batch_cache: &LoadedProgramsForTxBatch) {

runtime/src/bank.rs

@@ -4299,6 +4299,7 @@ impl Bank {
             &mut timings,
             Some(&account_overrides),
             None,
+            true,
         );
 
         let post_simulation_accounts = loaded_transactions
@@ -4537,7 +4538,7 @@ impl Bank {
         balances
     }
 
-    #[allow(clippy::type_complexity)]
+    #[allow(clippy::too_many_arguments, clippy::type_complexity)]
     pub fn load_and_execute_transactions(
         &self,
         batch: &TransactionBatch,
@@ -4548,6 +4549,7 @@ impl Bank {
         timings: &mut ExecuteTimings,
         account_overrides: Option<&AccountOverrides>,
         log_messages_bytes_limit: Option<usize>,
+        limit_to_load_programs: bool,
     ) -> LoadAndExecuteTransactionsOutput {
         let sanitized_txs = batch.sanitized_transactions();
         debug!("processing transactions: {}", sanitized_txs.len());
@@ -4614,6 +4616,7 @@ impl Bank {
                 account_overrides,
                 self.builtin_programs.iter(),
                 log_messages_bytes_limit,
+                limit_to_load_programs,
             );
 
         let mut signature_count = 0;
@@ -5663,6 +5666,7 @@ impl Bank {
             timings,
             None,
             log_messages_bytes_limit,
+            false,
         );
 
         let (last_blockhash, lamports_per_signature) =

svm/src/transaction_processor.rs

@@ -190,6 +190,7 @@ impl<FG: ForkGraph> TransactionBatchProcessor<FG> {
         account_overrides: Option<&AccountOverrides>,
         builtin_programs: impl Iterator<Item = &'a Pubkey>,
         log_messages_bytes_limit: Option<usize>,
+        limit_to_load_programs: bool,
     ) -> LoadAndExecuteSanitizedTransactionsOutput {
         let mut program_accounts_map = Self::filter_executable_program_accounts(
             callbacks,
@@ -202,9 +203,18 @@ impl<FG: ForkGraph> TransactionBatchProcessor<FG> {
             program_accounts_map.insert(*builtin_program, (&native_loader, 0));
         }
 
-        let programs_loaded_for_tx_batch = Rc::new(RefCell::new(
-            self.replenish_program_cache(callbacks, &program_accounts_map),
-        ));
+        let programs_loaded_for_tx_batch = Rc::new(RefCell::new(self.replenish_program_cache(
+            callbacks,
+            &program_accounts_map,
+            limit_to_load_programs,
+        )));
+
+        if programs_loaded_for_tx_batch.borrow().hit_max_limit {
+            return LoadAndExecuteSanitizedTransactionsOutput {
+                loaded_transactions: vec![],
+                execution_results: vec![],
+            };
+        }
 
         let mut load_time = Measure::start("accounts_load");
         let mut loaded_transactions = load_accounts(
@@ -356,6 +366,7 @@ impl<FG: ForkGraph> TransactionBatchProcessor<FG> {
         &self,
         callback: &CB,
         program_accounts_map: &HashMap<Pubkey, (&Pubkey, u64)>,
+        limit_to_load_programs: bool,
     ) -> LoadedProgramsForTxBatch {
         let mut missing_programs: Vec<(Pubkey, (LoadedProgramMatchCriteria, u64))> =
             if self.check_program_modification_slot {
@@ -401,7 +412,14 @@ impl<FG: ForkGraph> TransactionBatchProcessor<FG> {
                 }
                 // Submit our last completed loading task.
                 if let Some((key, program)) = program_to_store.take() {
-                    loaded_programs_cache.finish_cooperative_loading_task(self.slot, key, program);
+                    if loaded_programs_cache
+                        .finish_cooperative_loading_task(self.slot, key, program)
+                        && limit_to_load_programs
+                    {
+                        let mut ret = LoadedProgramsForTxBatch::default();
+                        ret.hit_max_limit = true;
+                        return ret;
+                    }
                 }
                 // Figure out which program needs to be loaded next.
                 let program_to_load = loaded_programs_cache.extract(