Обсуждение: pgsql: Convert unloggedLSN to an atomic variable.
Convert unloggedLSN to an atomic variable. Currently, this variable is an XLogRecPtr protected by a spinlock. By converting it to an atomic variable, we can remove the spinlock, which saves a small amount of shared memory space. Since this code is not performance-critical, we use atomic operations with full barrier semantics to make it easy to reason about correctness. Author: John Morris Reviewed-by: Michael Paquier, Robert Haas, Andres Freund, Stephen Frost, Bharath Rupireddy Discussion: https://postgr.es/m/BYAPR13MB26772534335255E50318C574A0409%40BYAPR13MB2677.namprd13.prod.outlook.com Discussion: https://postgr.es/m/MN2PR13MB2688FD8B757316CB5C54C8A2A0DDA%40MN2PR13MB2688.namprd13.prod.outlook.com Branch ------ master Details ------- https://git.postgresql.org/pg/commitdiff/963d3072af21afbcb1183b3c960135cc7df02f3f Modified Files -------------- src/backend/access/transam/xlog.c | 26 +++++++++----------------- 1 file changed, 9 insertions(+), 17 deletions(-)