* 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
* Page-pin packet memory for cuda
Bring back recyclers and pin offset buffers
* Add packet recycler to streamer
* Add set_pinnable to sigverify vecs to pin them
* Add packets reset test
* Add test for recycler and reduce the gc lock critical section
* Add comments/tests to cuda_runtime
* Add recycler to recv_blobs path.
* Add trace/names for debug and PacketsRecycler to bench-streamer
* Predict realloc and unpin beforehand.
* Add helper to reserve and pin
* Cap buffered packets length
* Call cuda wrapper functions
* Use Rc to prevent clone of Packets
* Fix min => max in banking_stage threads.
Coalesce packet buffers better since a larger batch will
be faster through banking and sigverify.
Deconstruct batches into banking_stage from sigverify since
sigverify likes to accumulate batches but then a single banking_stage
thread will be stuck with a large batch. Maximize parallelism by
creating more chunks of work for banking_stage.
* Remove unused PohServiceConfig::Step
* Clarify variable name
* Poh::hash() now takes an iteration counter
* man -> max
* Inline functions with single call site
* Move PohServiceConfig into GenesisBlock
* Add plumbing to enable real PoH on testnets
* Batch hashes to improve PoH hash rate
* Ensure a constant hashes_per_tick
* Remove PohEntry mixin field
* Poh/PohEntry no longer maintains tick_height
* Ensure a constant hashes_per_tick
* ci/localnet-sanity.sh: Use real PoH
* Rework Poh/PohService to keep PohRecorder unlocked as much as possible while hashing
* Introduce record locks on txs that will be recorded
* Add tests for LockedAccountsResults
* Fix broken bench
* Exit process_entries on detecting conflicting locks within same entry
* * rename Entry::serialized_size() to Entry::to_blob_size() to better
reduce confusion with bincode, et al. and to better reflect its
real meaning
* fix implementation of to_blob_size() to actually return what happens
when we do entries.to_blobs() (i.e. we serialize Vec<Entry>, not Entry)
* update tests to be more rigorous
* clippy