Remove unnecessary memcpy when reading WAL record fitting on page When reading a WAL record, its contents are copied into an intermediate buffer. However, doing so is not necessary if the record fits fully into the current page, saving one memcpy for each such record. The allocation handling of the intermediate buffer is also now done only when a record crosses a page boundary, shaving some extra cycles when reading a WAL record.
Author: Andrey Lepikhov Reviewed-by: Kyotaro Horiguchi, Heikki Linnakangas Discussion: https://postgr.es/m/c2ea54dd-a1d3-80eb-ddbf-7e6f258e6...@postgrespro.ru Branch ------ master Details ------- https://git.postgresql.org/pg/commitdiff/285bd0ac4a7c0538d544c40aa725682e11cb71a9 Modified Files -------------- src/backend/access/transam/xlog.c | 3 --- src/backend/access/transam/xlogreader.c | 27 +++++++++++++-------------- 2 files changed, 13 insertions(+), 17 deletions(-)
