Horton

Re: [HACKERS] Deadlock in XLogInsert at AIX

Robert Haas <robertmhaas@gmail.com>

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From: Robert Haas <robertmhaas@gmail.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Michael Paquier <michael.paquier@gmail.com>, Noah Misch <noah@leadboat.com>, Andres Freund <andres@anarazel.de>, Heikki Linnakangas <hlinnaka@iki.fi>, Konstantin Knizhnik <k.knizhnik@postgrespro.ru>, PostgreSQL Hackers <pgsql-hackers@postgresql.org>, Bernd Helmle <mailings@oopsware.de>
Date: 2018-01-23T14:52:39Z
Lists: pgsql-hackers 
On Mon, Jan 22, 2018 at 4:23 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
>> If nobody is willing to put in the effort to keep AIX supported under
>> XLC, then we should just update the documentation to say that it isn't
>> supported.  Our support for that platform is pretty marginal anyway if
>> we're only supporting it up through 6.1; that was released in 2007 and
>> went out of support in Q2 of last year.
>
> Huh?  We have somebody just upthread saying that they're working out
> issues on newer AIX.  We should at least give them time to finish
> that research before making any decisions.

Well, I certainly have no problem with that in theory.  That's why my
sentence started with the word "if".

On a practical level, this thread has been dead for almost a year, and
has revived slightly because Michael bumped it, but nobody has really
made a firm commitment to do any specific thing to move this issue
forward.  I'm happy if they do, but it might not happen.

-- 
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company

Commits

  1. For all ppc compilers, implement compare_exchange and fetch_add with asm.

  2. For PowerPC instruction "addi", use constraint "b".

  3. For all ppc compilers, implement pg_atomic_fetch_add_ with inline asm.

  4. Replace xlc __fetch_and_add() with inline asm.

  5. Test pg_atomic_fetch_add_ with variable addend and 16-bit edge cases.