| From: | torikoshia <torikoshia(at)oss(dot)nttdata(dot)com> |
|---|---|
| To: | Kasahara Tatsuhito <kasahara(dot)tatsuhito(at)gmail(dot)com> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Fujii Masao <masao(dot)fujii(at)oss(dot)nttdata(dot)com>, Georgios Kokolatos <gkokolatos(at)protonmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Get memory contexts of an arbitrary backend process |
| Date: | 2021-01-14 10:11:23 |
| Message-ID: | 40c1a4b19ad03beacee2642a3cd61c14@oss.nttdata.com |
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| Lists: | pgsql-hackers |
Since pg_get_target_backend_memory_contexts() waits to dump memory and
it could lead dead lock as below.
- session1
BEGIN; TRUNCATE t;
- session2
BEGIN; TRUNCATE t; -- wait
- session1
SELECT * FROM pg_get_target_backend_memory_contexts(<pid of session
2>); --wait
Thanks for notifying me, Fujii-san.
Attached v8 patch that prohibited calling the function inside
transactions.
Regards,
--
Atsushi Torikoshi
| Attachment | Content-Type | Size |
|---|---|---|
| v8-0001-Add-pg_get_target_backend_memory_contexts-to-coll.patch | text/x-diff | 34.1 KB |
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