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Implements a % cap on staking rewards from era inflation (#1660)

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This PR implements an (optional) cap of the era inflation that is
allocated to staking rewards. The remaining is minted directly into the
[`RewardRemainder`](https://github.com/paritytech/polkadot-sdk/blob/fb0fd3e62445eb2dee2b2456a0c8574d1ecdcc73/substrate/frame/staking/src/pallet/mod.rs#L160)
account, which is the treasury pot account in Polkadot and Kusama.

The staking pallet now has a percent storage item, `MaxStakersRewards`,
which defines the max percentage of the era inflation that should be
allocated to staking rewards. The remaining era inflation (i.e.
`remaining = max_era_payout - staking_payout.min(staking_payout *
MaxStakersRewards))` is minted directly into the treasury.

The `MaxStakersRewards` can be set by a privileged origin through the
`set_staking_configs` extrinsic.

**To finish**
- [x] run benchmarks for westend-runtime

Replaces https://github.com/paritytech/polkadot-sdk/pull/1483
Closes https://github.com/paritytech/polkadot-sdk/issues/403

---------

Co-authored-by: command-bot <>
This commit is contained in:
Gonçalo Pestana
2024-02-15 20:13:35 +01:00
committed by GitHub
parent 5fc7622cb3
commit fde44474e4
9 changed files with 427 additions and 300 deletions
Download Patch File Download Diff File Expand all files Collapse all files
substrate/frame/staking/src/benchmarking.rs
+6 -1
View File
@@ -855,7 +855,8 @@ benchmarks! {
ConfigOp::Set(u32::MAX),
ConfigOp::Set(u32::MAX),
ConfigOp::Set(Percent::max_value()),
ConfigOp::Set(Perbill::max_value())
ConfigOp::Set(Perbill::max_value()),
ConfigOp::Set(Percent::max_value())
) verify {
assert_eq!(MinNominatorBond::<T>::get(), BalanceOf::<T>::max_value());
assert_eq!(MinValidatorBond::<T>::get(), BalanceOf::<T>::max_value());
@@ -863,6 +864,7 @@ benchmarks! {
assert_eq!(MaxValidatorsCount::<T>::get(), Some(u32::MAX));
assert_eq!(ChillThreshold::<T>::get(), Some(Percent::from_percent(100)));
assert_eq!(MinCommission::<T>::get(), Perbill::from_percent(100));
assert_eq!(MaxStakedRewards::<T>::get(), Some(Percent::from_percent(100)));
}
set_staking_configs_all_remove {
@@ -873,6 +875,7 @@ benchmarks! {
ConfigOp::Remove,
ConfigOp::Remove,
ConfigOp::Remove,
ConfigOp::Remove,
ConfigOp::Remove
) verify {
assert!(!MinNominatorBond::<T>::exists());
@@ -881,6 +884,7 @@ benchmarks! {
assert!(!MaxValidatorsCount::<T>::exists());
assert!(!ChillThreshold::<T>::exists());
assert!(!MinCommission::<T>::exists());
assert!(!MaxStakedRewards::<T>::exists());
}
chill_other {
@@ -904,6 +908,7 @@ benchmarks! {
ConfigOp::Set(0),
ConfigOp::Set(Percent::from_percent(0)),
ConfigOp::Set(Zero::zero()),
ConfigOp::Noop,
)?;
let caller = whitelisted_caller();