* change paths to something accounts_db (the singleton) owns, fixes SIGILL
* fail deserialize if paths don't work
serialize paths, too
* test that paths are populated from a bank snapshot
* accounts_index: RwLock per-account
Lots of lock contention on the accounts_index lock,
only take write-lock on accounts_index if we need to insert/remove an
account.
For updates, take a read-lock and then write-lock on the individual
account.
* Remove unneeded enumerate and add comments.
* Implement CreditOnlyLocks
* Update credit-only atomic on account load
* Update credit-only atomic after bank.freeze_lock; store credits if all credit-only lock references are dropped
* Commit credit-only credits on bank freeze
* Update core to CreditAccountLocks
* Impl credit-only in System Transfer
* Rework CreditAccountLocks, test, and fix bugs
* Review comments: Pass CreditAccountLocks by reference; Tighten up insert block
* Only store credits on completed slot
* Check balance in bench_exchange funding to ensure commit_credits has completed
* Add is_debitable info to KeyedAccount meta to pass into programs
* Reinstate CreditOnlyLocks check on lock_account
* Rework CreditAccountLocks to remove strong_count usage
* Add multi-threaded credit-only locks test
* Improve RwLocks usage
* Review comments: panic if bad things happen; tighter code
* Assert lock_accounts race does not happen
* Revert panic if bad things happen; not a bad thing
* Add credit-only debit/data check to verify_instruction
* Store credits and pass to accounts_db
* Add InstructionErrors and tests
* Relax account locks for credit-only accounts
* Collect credit-only account credits before passing to accounts_db to store properly
* Convert System Transfer accounts to credit-only, and fixup test
* Functionalize collect_accounts to unit test
* Review comments
* Rebase
* Add accounts_index bench
* Don't take the accounts index lock unless needed
* Accounts_index remove insert return vec and add capacity stats
* Use hashbrown hashmap for accounts_index
* Be able to create bank snapshots
* fix clippy
* load snapshot on start
* regenerate account index from the storage
* Remove rc feature dependency
* cleanup
* save snapshot for slot 0
* Add optional depth parameter to pubsub, and store in subscriptions
* Pass bank_forks into rpc_subscription; add method to check depth before notify and impl for account subscriptions
* Impl check-depth for signature subscriptions
* Impl check-depth for program subscriptions
* Plumb fork id through accounts
* Use fork id and root to prevent repeated account notifications; also s/Depth/Confirmations
* Write tests in terms of bank_forks
* Fixup accounts tests
* Add pubsub-confirmations tests
* Update pubsub documentation
* Revert "Revert "account storage is not in sync with the index after gc (#3914)" (#3936)"
This reverts commit 4f47fc00bc.
* fix get_exclusive_storage
* clippy
* account storage is not in sync with the index after gc
* builds
* clippy fmt
* test
* purge dead forks on store
* rm println
* also fixed count_stores
* comments
