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postgresql/src/include/storage/aio_subsys.h

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aio: Basic subsystem initialization 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
2025-03-17 18:51:33 -04:00
/*-------------------------------------------------------------------------
*
* aio_subsys.h
* Interaction with AIO as a subsystem, rather than actually issuing AIO
*
* This header is for AIO related functionality that's being called by files
* that don't perform AIO, but interact with the AIO subsystem in some
* form. E.g. postmaster.c and shared memory initialization need to initialize
* AIO but don't perform AIO.
*
Update copyright for 2026 Backpatch-through: 14
2026-01-01 13:24:10 -05:00
* Portions Copyright (c) 1996-2026, PostgreSQL Global Development Group
aio: Basic subsystem initialization 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
2025-03-17 18:51:33 -04:00
* Portions Copyright (c) 1994, Regents of the University of California
*
* src/include/storage/aio_subsys.h
*
*-------------------------------------------------------------------------
*/
#ifndef AIO_SUBSYS_H
#define AIO_SUBSYS_H
/* aio_init.c */
extern void pgaio_init_backend(void);
/* aio.c */
extern void pgaio_error_cleanup(void);
extern void AtEOXact_Aio(bool is_commit);
aio: Infrastructure for io_method=worker This commit contains the basic, system-wide, infrastructure for io_method=worker. It does not yet actually execute IO, this commit just provides the infrastructure for running IO workers, kept separate for easier review. The number of IO workers can be adjusted with a PGC_SIGHUP GUC. Eventually we'd like to make the number of workers dynamically scale up/down based on the current "IO load". To allow the number of IO workers to be increased without a restart, we need to reserve PGPROC entries for the workers unconditionally. This has been judged to be worth the cost. If it turns out to be problematic, we can introduce a PGC_POSTMASTER GUC to control the maximum number. As io workers might be needed during shutdown, e.g. for AIO during the shutdown checkpoint, a new PMState phase is added. IO workers are shut down after the shutdown checkpoint has been performed and walsender/archiver have shut down, but before the checkpointer itself shuts down. See also 87a6690cc69. Updates PGSTAT_FILE_FORMAT_ID due to the addition of a new BackendType. Reviewed-by: Noah Misch <noah@leadboat.com> Co-authored-by: Thomas Munro <thomas.munro@gmail.com> Co-authored-by: Andres Freund <andres@anarazel.de> Discussion: https://postgr.es/m/uvrtrknj4kdytuboidbhwclo4gxhswwcpgadptsjvjqcluzmah%40brqs62irg4dt Discussion: https://postgr.es/m/20210223100344.llw5an2aklengrmn@alap3.anarazel.de Discussion: https://postgr.es/m/stj36ea6yyhoxtqkhpieia2z4krnam7qyetc57rfezgk4zgapf@gcnactj4z56m
2025-03-18 10:52:33 -04:00
Fix typos and grammar in the code The large majority of these have been introduced by recent commits done in the v18 development cycle. Author: Alexander Lakhin <exclusion@gmail.com> Discussion: https://postgr.es/m/9a7763ab-5252-429d-a943-b28941e0e28b@gmail.com
2025-04-19 06:17:42 -04:00
/* method_worker.c */
aio: Infrastructure for io_method=worker This commit contains the basic, system-wide, infrastructure for io_method=worker. It does not yet actually execute IO, this commit just provides the infrastructure for running IO workers, kept separate for easier review. The number of IO workers can be adjusted with a PGC_SIGHUP GUC. Eventually we'd like to make the number of workers dynamically scale up/down based on the current "IO load". To allow the number of IO workers to be increased without a restart, we need to reserve PGPROC entries for the workers unconditionally. This has been judged to be worth the cost. If it turns out to be problematic, we can introduce a PGC_POSTMASTER GUC to control the maximum number. As io workers might be needed during shutdown, e.g. for AIO during the shutdown checkpoint, a new PMState phase is added. IO workers are shut down after the shutdown checkpoint has been performed and walsender/archiver have shut down, but before the checkpointer itself shuts down. See also 87a6690cc69. Updates PGSTAT_FILE_FORMAT_ID due to the addition of a new BackendType. Reviewed-by: Noah Misch <noah@leadboat.com> Co-authored-by: Thomas Munro <thomas.munro@gmail.com> Co-authored-by: Andres Freund <andres@anarazel.de> Discussion: https://postgr.es/m/uvrtrknj4kdytuboidbhwclo4gxhswwcpgadptsjvjqcluzmah%40brqs62irg4dt Discussion: https://postgr.es/m/20210223100344.llw5an2aklengrmn@alap3.anarazel.de Discussion: https://postgr.es/m/stj36ea6yyhoxtqkhpieia2z4krnam7qyetc57rfezgk4zgapf@gcnactj4z56m
2025-03-18 10:52:33 -04:00
extern bool pgaio_workers_enabled(void);
aio: Basic subsystem initialization 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
2025-03-17 18:51:33 -04:00
#endif /* AIO_SUBSYS_H */
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