v2.1: SIMD-0207: Raise block limit to 50M (backport of #4112)

cost-model/src/block_cost_limits.rs

@@ -38,6 +38,7 @@ pub const MAX_BLOCK_UNITS: u64 =
 
 #[cfg(test)]
 static_assertions::const_assert_eq!(MAX_BLOCK_UNITS, 48_000_000);
+pub const MAX_BLOCK_UNITS_SIMD_0207: u64 = 50_000_000;
 
 /// Number of compute units that a writable account in a block is allowed. The
 /// limit is to prevent too many transactions write to same account, therefore
@@ -57,3 +58,16 @@ static_assertions::const_assert_eq!(MAX_VOTE_UNITS, 36_000_000);
 /// The maximum allowed size, in bytes, that accounts data can grow, per block.
 /// This can also be thought of as the maximum size of new allocations per block.
 pub const MAX_BLOCK_ACCOUNTS_DATA_SIZE_DELTA: u64 = 100_000_000;
+
+/// Return the block limits that will be used upon activation of SIMD-0207.
+/// Returns as
+/// (account_limit, block_limit, vote_limit)
+// ^ Above order is used to be consistent with the order of
+//   `CostTracker::set_limits`.
+pub const fn simd_0207_block_limits() -> (u64, u64, u64) {
+    (
+        MAX_WRITABLE_ACCOUNT_UNITS,
+        MAX_BLOCK_UNITS_SIMD_0207,
+        MAX_VOTE_UNITS,
+    )
+}

cost-model/src/cost_tracker.rs

@@ -129,6 +129,11 @@ impl CostTracker {
         self.in_flight_transaction_count = 0;
     }
 
+    /// Get the overall block limit.
+    pub fn get_block_limit(&self) -> u64 {
+        self.block_cost_limit
+    }
+
     /// allows to adjust limits initiated during construction
     pub fn set_limits(
         &mut self,

runtime/src/bank.rs

@@ -96,7 +96,7 @@ use {
         create_program_runtime_environment_v1, create_program_runtime_environment_v2,
     },
     solana_compute_budget::compute_budget::ComputeBudget,
-    solana_cost_model::cost_tracker::CostTracker,
+    solana_cost_model::{block_cost_limits::simd_0207_block_limits, cost_tracker::CostTracker},
     solana_feature_set::{
         self as feature_set, remove_rounding_in_fee_calculation, reward_full_priority_fee,
         FeatureSet,
@@ -5066,6 +5066,22 @@ impl Bank {
             debug_do_not_add_builtins,
         );
 
+        // Cost-Tracker is not serialized in snapshot or any configs.
+        // We must apply previously activated features related to limits here
+        // so that the initial bank state is consistent with the feature set.
+        // Cost-tracker limits are propagated through children banks.
+        if self
+            .feature_set
+            .is_active(&feature_set::raise_block_limits_to_50m::id())
+        {
+            let (account_cost_limit, block_cost_limit, vote_cost_limit) = simd_0207_block_limits();
+            self.write_cost_tracker().unwrap().set_limits(
+                account_cost_limit,
+                block_cost_limit,
+                vote_cost_limit,
+            );
+        }
+
         if !debug_do_not_add_builtins {
             for builtin in BUILTINS
                 .iter()
@@ -6639,6 +6655,15 @@ impl Bank {
         if new_feature_activations.contains(&feature_set::update_hashes_per_tick6::id()) {
             self.apply_updated_hashes_per_tick(UPDATED_HASHES_PER_TICK6);
         }
+
+        if new_feature_activations.contains(&feature_set::raise_block_limits_to_50m::id()) {
+            let (account_cost_limit, block_cost_limit, vote_cost_limit) = simd_0207_block_limits();
+            self.write_cost_tracker().unwrap().set_limits(
+                account_cost_limit,
+                block_cost_limit,
+                vote_cost_limit,
+            );
+        }
     }
 
     fn apply_updated_hashes_per_tick(&mut self, hashes_per_tick: u64) {

runtime/src/bank/tests.rs

@@ -38,6 +38,7 @@ use {
         compute_budget_limits::{self, MAX_COMPUTE_UNIT_LIMIT},
         prioritization_fee::{PrioritizationFeeDetails, PrioritizationFeeType},
     },
+    solana_cost_model::block_cost_limits::{MAX_BLOCK_UNITS, MAX_BLOCK_UNITS_SIMD_0207},
     solana_feature_set::{self as feature_set, FeatureSet},
     solana_inline_spl::token,
     solana_logger,
@@ -7999,6 +8000,73 @@ fn test_reserved_account_keys() {
     );
 }
 
+#[test]
+fn test_block_limits() {
+    let (bank0, _bank_forks) = create_simple_test_arc_bank(100_000);
+    let mut bank = Bank::new_from_parent(bank0, &Pubkey::default(), 1);
+    assert!(!bank
+        .feature_set
+        .is_active(&feature_set::raise_block_limits_to_50m::id()));
+    assert_eq!(
+        bank.read_cost_tracker().unwrap().get_block_limit(),
+        MAX_BLOCK_UNITS,
+        "before activating the feature, bank should have old/default limit"
+    );
+
+    // Activate `raise_block_limits_to_50m` feature
+    bank.store_account(
+        &feature_set::raise_block_limits_to_50m::id(),
+        &feature::create_account(&Feature::default(), 42),
+    );
+    // apply_feature_activations for `FinishInit` will not cause the block limit to be updated
+    bank.apply_feature_activations(ApplyFeatureActivationsCaller::FinishInit, true);
+    assert_eq!(
+        bank.read_cost_tracker().unwrap().get_block_limit(),
+        MAX_BLOCK_UNITS,
+        "before activating the feature, bank should have old/default limit"
+    );
+
+    // apply_feature_activations for `NewFromParent` will cause feature to be activated
+    bank.apply_feature_activations(ApplyFeatureActivationsCaller::NewFromParent, true);
+    assert_eq!(
+        bank.read_cost_tracker().unwrap().get_block_limit(),
+        MAX_BLOCK_UNITS_SIMD_0207,
+        "after activating the feature, bank should have new limit"
+    );
+
+    // Make sure the limits propagate to the child-bank.
+    let bank = Bank::new_from_parent(Arc::new(bank), &Pubkey::default(), 2);
+    assert_eq!(
+        bank.read_cost_tracker().unwrap().get_block_limit(),
+        MAX_BLOCK_UNITS_SIMD_0207,
+        "child bank should have new limit"
+    );
+
+    // Test starting from a genesis config with and without feature account
+    let (mut genesis_config, _keypair) = create_genesis_config(100_000);
+    // Without feature account in genesis, old limits are used.
+    let bank = Bank::new_for_tests(&genesis_config);
+    assert_eq!(
+        bank.read_cost_tracker().unwrap().get_block_limit(),
+        MAX_BLOCK_UNITS,
+        "before activating the feature, bank should have old/default limit"
+    );
+
+    activate_feature(
+        &mut genesis_config,
+        feature_set::raise_block_limits_to_50m::id(),
+    );
+    let bank = Bank::new_for_tests(&genesis_config);
+    assert!(bank
+        .feature_set
+        .is_active(&feature_set::raise_block_limits_to_50m::id()));
+    assert_eq!(
+        bank.read_cost_tracker().unwrap().get_block_limit(),
+        MAX_BLOCK_UNITS_SIMD_0207,
+        "bank created from genesis config should have new limit"
+    );
+}
+
 #[test]
 fn test_program_replacement() {
     let mut bank = create_simple_test_bank(0);

sdk/feature-set/src/lib.rs

@@ -881,6 +881,10 @@ pub mod migrate_stake_program_to_core_bpf {
     solana_pubkey::declare_id!("6M4oQ6eXneVhtLoiAr4yRYQY43eVLjrKbiDZDJc892yk");
 }
 
+pub mod raise_block_limits_to_50m {
+    solana_pubkey::declare_id!("5oMCU3JPaFLr8Zr4ct7yFA7jdk6Mw1RmB8K4u9ZbS42z");
+}
+
 lazy_static! {
     /// Map of feature identifiers to user-visible description
     pub static ref FEATURE_NAMES: HashMap<Pubkey, &'static str> = [
@@ -1096,6 +1100,7 @@ lazy_static! {
         (disable_account_loader_special_case::id(), "Disable account loader special case #3513"),
         (enable_secp256r1_precompile::id(), "Enable secp256r1 precompile SIMD-0075"),
         (migrate_stake_program_to_core_bpf::id(), "Migrate Stake program to Core BPF SIMD-0196 #3655"),
+        (raise_block_limits_to_50m::id(), "Raise block limit to 50M SIMD-0207"),
         /*************** ADD NEW FEATURES HERE ***************/
     ]
     .iter()