Add pico-inflation feature

runtime/src/bank.rs

@@ -1097,13 +1097,18 @@ impl Bank {
 
         let validator_point_value = self.pay_validator_rewards(validator_rewards);
 
-        // this sysvar could be retired...
-        self.update_sysvar_account(&sysvar::rewards::id(), |account| {
-            sysvar::rewards::create_account(
-                self.inherit_sysvar_account_balance(account),
-                validator_point_value,
-            )
-        });
+        if !self
+            .feature_set
+            .is_active(&feature_set::pico_inflation::id())
+        {
+            // this sysvar can be retired once `pico_inflation` is enabled on all clusters
+            self.update_sysvar_account(&sysvar::rewards::id(), |account| {
+                sysvar::rewards::create_account(
+                    self.inherit_sysvar_account_balance(account),
+                    validator_point_value,
+                )
+            });
+        }
 
         let validator_rewards_paid =
             self.stakes.read().unwrap().vote_balance_and_staked() - vote_balance_and_staked;
@@ -3555,6 +3560,13 @@ impl Bank {
     // The entire code path herein must be idempotent
     fn apply_feature_activations(&mut self, init_finish_or_warp: bool, initiate_callback: bool) {
         let new_feature_activations = self.compute_active_feature_set(!init_finish_or_warp);
+
+        if new_feature_activations.contains(&feature_set::pico_inflation::id()) {
+            *self.inflation.write().unwrap() = Inflation::new_fixed(0.0001); // 0.01% inflation
+            self.fee_rate_governor.burn_percent = 50; // 50% fee burn
+            self.rent_collector.rent.burn_percent = 50; // 50% rent burn
+        }
+
         self.ensure_builtins(init_finish_or_warp, &new_feature_activations);
         self.reinvoke_entered_epoch_callback(initiate_callback);
         self.recheck_cross_program_support();

runtime/src/feature_set.rs

@@ -17,12 +17,17 @@ pub mod consistent_recent_blockhashes_sysvar {
     solana_sdk::declare_id!("3h1BQWPDS5veRsq6mDBWruEpgPxRJkfwGexg5iiQ9mYg");
 }
 
+pub mod pico_inflation {
+    solana_sdk::declare_id!("GaBtBJvmS4Arjj5W1NmFcyvPjsHN38UGYDq2MDwbs9Qu");
+}
+
 lazy_static! {
     /// Map of feature identifiers to user-visible description
     pub static ref FEATURE_NAMES: HashMap<Pubkey, &'static str> = [
         (instructions_sysvar_enabled::id(), "instructions sysvar"),
         (secp256k1_program_enabled::id(), "secp256k1 program"),
         (consistent_recent_blockhashes_sysvar::id(), "consistent recentblockhashes sysvar"),
+        (pico_inflation::id(), "pico-inflation"),
         /*************** ADD NEW FEATURES HERE ***************/
     ]
     .iter()

runtime/src/serde_snapshot/tests.rs

@@ -261,7 +261,7 @@ mod test_bank_serialize {
 
     // These some what long test harness is required to freeze the ABI of
     // Bank's serialization due to versioned nature
-    #[frozen_abi(digest = "FaZaic5p7bvdsKDxGJmaPVyp12AbAmURyYoGiUdx1Ksu")]
+    #[frozen_abi(digest = "5rd8RyVSLH3hm12xJDVCJWgc1gyqb4Ukt2hJLJNfsB5v")]
     #[derive(Serialize, AbiExample)]
     pub struct BankAbiTestWrapperFuture {
         #[serde(serialize_with = "wrapper_future")]