26bf2b7e45
process_pull_requests acquires a write lock on crds table to update records timestamp for each of the pull-request callers: https://github.com/solana-labs/solana/blob/3087c9049/core/src/crds_gossip_pull.rs#L287-L300 However, pull-requests overlap a lot in callers and this function ends up doing a lot of redundant duplicate work. This commit obtains unique callers before acquiring an exclusive lock on crds table.