Horton

Re: pg_shmem_allocations view

Andres Freund <andres@2ndquadrant.com>

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From: Andres Freund <andres@2ndquadrant.com>
To: Robert Haas <robertmhaas@gmail.com>
Cc: Tom Lane <tgl@sss.pgh.pa.us>, "pgsql-hackers@postgresql.org" <pgsql-hackers@postgresql.org>
Date: 2014-05-08T13:28:22Z
Lists: pgsql-hackers

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On 2014-05-08 07:58:34 -0400, Robert Haas wrote:
> On Wed, May 7, 2014 at 5:54 PM, Andres Freund <andres@2ndquadrant.com> wrote:
> > Hm. Not sure what you're ACKing here ;).
> 
> The idea of giving the unallocated memory a NULL key.

Ok. A new version of the patches implementing that are
attached. Including a couple of small fixups and docs. The latter aren't
extensive, but that doesn't seem to be warranted anyway.

> > There's lots of allocations from shmem that cannot be associated with
> > any index entry though. Not just ShmemIndex's own entry. Most
> > prominently most of the memory used for SharedBufHash isn't actually
> > associated with the "Shared Buffer Lookup Table" entry - imo a
> > dynahash.c defficiency.

> Hmm, I don't know what to do about that.

Well, we have to live with it for now :)

Greetings,

Andres Freund

-- 
 Andres Freund	                   http://www.2ndQuadrant.com/
 PostgreSQL Development, 24x7 Support, Training & Services

Commits

  1. Add pg_shmem_allocations view.