aio: Add io_method=io_uring Performing AIO using io_uring can be considerably faster than io_method=worker, particularly when lots of small IOs are issued, as a) the context-switch overhead for worker based AIO becomes more significant b) the number of IO workers can become limiting
io_uring, however, is linux specific and requires an additional compile-time dependency (liburing). This implementation is fairly simple and there are substantial optimization opportunities. The description of the existing AIO_IO_COMPLETION wait event is updated to make the difference between it and the new AIO_IO_URING_EXECUTION clearer. Reviewed-by: Noah Misch <n...@leadboat.com> Reviewed-by: Jakub Wartak <jakub.war...@enterprisedb.com> Discussion: https://postgr.es/m/uvrtrknj4kdytuboidbhwclo4gxhswwcpgadptsjvjqcluzmah%40brqs62irg4dt Discussion: https://postgr.es/m/20210223100344.llw5an2akleng...@alap3.anarazel.de Discussion: https://postgr.es/m/stj36ea6yyhoxtqkhpieia2z4krnam7qyetc57rfezgk4zgapf@gcnactj4z56m Branch ------ master Details ------- https://git.postgresql.org/pg/commitdiff/c325a7633fcb33dbd73f46ddbbe91e95ddf3b227 Modified Files -------------- .cirrus.tasks.yml | 3 + doc/src/sgml/config.sgml | 8 + src/backend/storage/aio/Makefile | 1 + src/backend/storage/aio/aio.c | 41 ++ src/backend/storage/aio/aio_io.c | 22 ++ src/backend/storage/aio/meson.build | 1 + src/backend/storage/aio/method_io_uring.c | 484 ++++++++++++++++++++++++ src/backend/storage/lmgr/lwlock.c | 1 + src/backend/utils/activity/wait_event_names.txt | 4 +- src/backend/utils/misc/postgresql.conf.sample | 3 +- src/include/storage/aio.h | 8 + src/include/storage/aio_internal.h | 13 + src/include/storage/lwlock.h | 1 + src/tools/pgindent/typedefs.list | 1 + 14 files changed, 589 insertions(+), 2 deletions(-)
