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implements copy-on-write for vote-accounts (#19362)

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Bank::vote_accounts redundantly clones vote-accounts HashMap even though
an immutable reference will suffice:
https://github.com/solana-labs/solana/blob/95c998a19/runtime/src/bank.rs#L5174-L5186

This commit implements copy-on-write semantics for vote-accounts by
wrapping the underlying HashMap in Arc<...>.
This commit is contained in:
behzad nouri
2021-08-30 15:54:01 +00:00
committed by GitHub
parent f19ff84593
commit 8ad52fa095
11 changed files with 215 additions and 175 deletions
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7
runtime/src/epoch_stakes.rs
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@@ -24,9 +24,9 @@ pub struct EpochStakes {
impl EpochStakes {
pub fn new(stakes: &Stakes, leader_schedule_epoch: Epoch) -> Self {
let epoch_vote_accounts = Stakes::vote_accounts(stakes);
let epoch_vote_accounts = stakes.vote_accounts();
let (total_stake, node_id_to_vote_accounts, epoch_authorized_voters) =
Self::parse_epoch_vote_accounts(epoch_vote_accounts, leader_schedule_epoch);
Self::parse_epoch_vote_accounts(epoch_vote_accounts.as_ref(), leader_schedule_epoch);
Self {
stakes: Arc::new(stakes.clone()),
total_stake,
@@ -52,7 +52,8 @@ impl EpochStakes {
}
pub fn vote_account_stake(&self, vote_account: &Pubkey) -> u64 {
Stakes::vote_accounts(&self.stakes)
self.stakes
.vote_accounts()
.get(vote_account)
.map(|(stake, _)| *stake)
.unwrap_or(0)