Horton

Re: OK, so culicidae is *still* broken

Craig Ringer <craig@2ndquadrant.com>

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From: Craig Ringer <craig@2ndquadrant.com>
To: Heikki Linnakangas <hlinnaka@iki.fi>
Cc: Andres Freund <andres@anarazel.de>, PostgreSQL Hackers <pgsql-hackers@postgresql.org>, Amit Kapila <amit.kapila16@gmail.com>, Tom Lane <tgl@sss.pgh.pa.us>
Date: 2017-04-25T12:18:16Z
Lists: pgsql-hackers 
On 25 Apr. 2017 13:37, "Heikki Linnakangas" <hlinnaka@iki.fi> wrote:


For some data shared memory structures, that store no pointers, we wouldn't
need to insist that they are mapped to the same address in every backend,
though. In particular, shared_buffers. It wouldn't eliminate the problem,
though, only make it less likely, so we'd still need to retry when it does
happen.


Good point. Simply splitting out shared_buffers into a moveable segment
would make a massive difference. Much less chance of losing the dice roll
for mapping the fixed segment.

Should look at what else could be made cheaply relocatable too.

Commits

  1. Provide a way to control SysV shmem attach address in EXEC_BACKEND builds.

  2. Disable RandomizedBaseAddress on MSVC builds