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Nathan Bossart f894acb24a Show size of DSAs and dshashes in pg_dsm_registry_allocations. ... Presently, this view reports NULL for the size of DSAs and dshash tables because 1) the current backend might not be attached to them and 2) the registry doesn't save the pointers to the dsa_area or dshash_table in local memory. Also, the view doesn't show partially-initialized entries to avoid ambiguity, since those entries would report a NULL size as well. This commit introduces a function that looks up the size of a DSA given its handle (transiently attaching to the control segment if needed) and teaches pg_dsm_registry_allocations to use it to show the size of successfully-initialized DSA and dshash entries. Furthermore, the view now reports partially-initialized entries with a NULL size. Reviewed-by: Rahila Syed <rahilasyed90@gmail.com> Reviewed-by: Robert Haas <robertmhaas@gmail.com> Reviewed-by: Chao Li <li.evan.chao@gmail.com> Discussion: https://postgr.es/m/aSeEDeznAsHR1_YF%40nathan		2 weeks ago
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src	Show size of DSAs and dshashes in pg_dsm_registry_allocations.	2 weeks ago
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