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pgsql: Teach DSM registry to retry entry initialization if needed. 3+ messages / 1 participants [nested] [flat]
* pgsql: Teach DSM registry to retry entry initialization if needed. @ 2025-11-26 21:16 Nathan Bossart <nathan@postgresql.org> 0 siblings, 0 replies; 3+ messages in thread From: Nathan Bossart @ 2025-11-26 21:16 UTC (permalink / raw) To: pgsql-committers@lists.postgresql.org Teach DSM registry to retry entry initialization if needed. If DSM registry entry initialization fails, backends could try to use an uninitialized DSM segment, DSA, or dshash table (since the entry is still added to the registry). To fix, restructure the code so that the registry retries initialization as needed. This commit also modifies pg_get_dsm_registry_allocations() to leave out partially-initialized entries, as they shouldn't have any allocated memory. DSM registry entry initialization shouldn't fail often in practice, but retrying was deemed better than leaving entries in a permanently failed state (as was done by commit 1165a933aa, which has since been reverted). Suggested-by: Robert Haas <robertmhaas@gmail.com> Reviewed-by: Robert Haas <robertmhaas@gmail.com> Discussion: https://postgr.es/m/E1vJHUk-006I7r-37%40gemulon.postgresql.org Backpatch-through: 17 Branch ------ REL_18_STABLE Details ------- https://git.postgresql.org/pg/commitdiff/b83bcc0df180056b9374bd4239d32fea84bb46f2 Modified Files -------------- src/backend/storage/ipc/dsm_registry.c | 37 ++++++++++++++++++---------------- 1 file changed, 20 insertions(+), 17 deletions(-) ^ permalink raw reply [nested|flat] 3+ messages in thread
* pgsql: Teach DSM registry to retry entry initialization if needed. @ 2025-11-26 21:16 Nathan Bossart <nathan@postgresql.org> 0 siblings, 0 replies; 3+ messages in thread From: Nathan Bossart @ 2025-11-26 21:16 UTC (permalink / raw) To: pgsql-committers@lists.postgresql.org Teach DSM registry to retry entry initialization if needed. If DSM registry entry initialization fails, backends could try to use an uninitialized DSM segment, DSA, or dshash table (since the entry is still added to the registry). To fix, restructure the code so that the registry retries initialization as needed. This commit also modifies pg_get_dsm_registry_allocations() to leave out partially-initialized entries, as they shouldn't have any allocated memory. DSM registry entry initialization shouldn't fail often in practice, but retrying was deemed better than leaving entries in a permanently failed state (as was done by commit 1165a933aa, which has since been reverted). Suggested-by: Robert Haas <robertmhaas@gmail.com> Reviewed-by: Robert Haas <robertmhaas@gmail.com> Discussion: https://postgr.es/m/E1vJHUk-006I7r-37%40gemulon.postgresql.org Backpatch-through: 17 Branch ------ master Details ------- https://git.postgresql.org/pg/commitdiff/dbdc717ac6743074c3a55fc5c380638c91d24afd Modified Files -------------- src/backend/storage/ipc/dsm_registry.c | 121 +++++++++++++++++++++------------ 1 file changed, 78 insertions(+), 43 deletions(-) ^ permalink raw reply [nested|flat] 3+ messages in thread
* pgsql: Teach DSM registry to retry entry initialization if needed. @ 2025-11-26 21:16 Nathan Bossart <nathan@postgresql.org> 0 siblings, 0 replies; 3+ messages in thread From: Nathan Bossart @ 2025-11-26 21:16 UTC (permalink / raw) To: pgsql-committers@lists.postgresql.org Teach DSM registry to retry entry initialization if needed. If DSM registry entry initialization fails, backends could try to use an uninitialized DSM segment, DSA, or dshash table (since the entry is still added to the registry). To fix, restructure the code so that the registry retries initialization as needed. This commit also modifies pg_get_dsm_registry_allocations() to leave out partially-initialized entries, as they shouldn't have any allocated memory. DSM registry entry initialization shouldn't fail often in practice, but retrying was deemed better than leaving entries in a permanently failed state (as was done by commit 1165a933aa, which has since been reverted). Suggested-by: Robert Haas <robertmhaas@gmail.com> Reviewed-by: Robert Haas <robertmhaas@gmail.com> Discussion: https://postgr.es/m/E1vJHUk-006I7r-37%40gemulon.postgresql.org Backpatch-through: 17 Branch ------ REL_17_STABLE Details ------- https://git.postgresql.org/pg/commitdiff/2fc5c5062207a26b4ea4144a3d70099767eee523 Modified Files -------------- src/backend/storage/ipc/dsm_registry.c | 37 ++++++++++++++++++---------------- 1 file changed, 20 insertions(+), 17 deletions(-) ^ permalink raw reply [nested|flat] 3+ messages in thread
end of thread, other threads:[~2025-11-26 21:16 UTC | newest] Thread overview: 3+ messages (download: mbox mbox.gz follow: Atom feed) -- links below jump to the message on this page -- 2025-11-26 21:16 pgsql: Teach DSM registry to retry entry initialization if needed. Nathan Bossart <nathan@postgresql.org> 2025-11-26 21:16 pgsql: Teach DSM registry to retry entry initialization if needed. Nathan Bossart <nathan@postgresql.org> 2025-11-26 21:16 pgsql: Teach DSM registry to retry entry initialization if needed. Nathan Bossart <nathan@postgresql.org>
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