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aio: Basic subsystem initialization

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This commit just does the minimal wiring up of the AIO subsystem, added in the
next commit, to the rest of the system. The next commit contains more details
about motivation and architecture.

This commit is kept separate to make it easier to review, separating the
changes across the tree, from the implementation of the new subsystem.

We discussed squashing this commit with the main commit before merging AIO,
but there has been a mild preference for keeping it separate.

Reviewed-by: Heikki Linnakangas <hlinnaka@iki.fi>
Reviewed-by: Noah Misch <noah@leadboat.com>
Discussion: https://postgr.es/m/uvrtrknj4kdytuboidbhwclo4gxhswwcpgadptsjvjqcluzmah%40brqs62irg4dt
This commit is contained in:
Andres Freund
2025-03-17 18:51:33 -04:00
parent 65db3963ae
commit 02844012b3
24 changed files with 356 additions and 0 deletions
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6
src/backend/utils/misc/postgresql.conf.sample
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@ -202,6 +202,12 @@
#maintenance_io_concurrency = 10 # 1-1000; 0 disables prefetching
#io_combine_limit = 128kB # usually 1-32 blocks (depends on OS)
#io_method = sync # sync (change requires restart)
#io_max_concurrency = -1 # Max number of IOs that one process
# can execute simultaneously
# -1 sets based on shared_buffers
# (change requires restart)
# - Worker Processes -
#max_worker_processes = 8 # (change requires restart)