Sergey Vojtovich added a comment - 2018-01-22 12:27 Pushed commit 8e1adff95993effaa22129ff34b4570b755434ac Author: Sergey Vojtovich <svoj@mariadb.org> Date: Sun Jan 21 14:10:06 2018 +0400   Simplified away ReadView::complete()   It was supposed to be called out of mutex, but nevertheless was called under trx_sys.mutex for normal threads adding one extra condtion in critical section.   commit 4dc30f3c170b9deab1ff0b472930baba5c65b01c Author: Sergey Vojtovich <svoj@mariadb.org> Date: Sat Jan 20 17:45:42 2018 +0400   MDEV-15019 - InnoDB: store ReadView on trx   This will allow us to reduce critical section protected by trx_sys.mutex: - no need to maintain global m_free list - eliminate if (trx->read_view == NULL) condition.   On x86_64 sizeof(Readview) is 144 mostly due to padding, sizeof(trx_t) with ReadView is 1200.   Also don't close ReadView for read-write transactions, just mark it closed similarly to read-only.   Clean-up: removed n_prepared_recovered_trx and n_prepared_trx, which accidentally re-appeared after some rebase.

Sergey Vojtovich added a comment - 2018-01-21 09:36 marko , please review https://github.com/MariaDB/server/commit/9f72798a8fe27fb06ceeb2f543c186ee8faa987a