From: Andres Freund <andres@anarazel.de>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Gurjeet Singh <gurjeet@singh.im>
Cc: Peter Eisentraut <peter_e@gmx.net>
Cc: PGSQL Hackers <pgsql-hackers@postgresql.org>
Subject: Re: /proc/self/oom_adj is deprecated in newer Linux kernels
Date: Tue, 10 Jun 2014 17:57:36 +0200
Message-ID: <20140610155736.GP8406@alap3.anarazel.de> (raw)
In-Reply-To: <31348.1402415537@sss.pgh.pa.us>
References: <15953.1316362868@sss.pgh.pa.us>
<1316420754.14001.3.camel@fsopti579.F-Secure.com>
<16241.1316441883@sss.pgh.pa.us>
<CABwTF4XDdYiBQXqj=CKrFXN7x2NiBbVnpHSJG6AVnMBLnLBmLA@mail.gmail.com>
<20140610143202.GI8406@alap3.anarazel.de>
<30402.1402412692@sss.pgh.pa.us>
<20140610150933.GK8406@alap3.anarazel.de>
<30709.1402413628@sss.pgh.pa.us>
<20140610153347.GM8406@alap3.anarazel.de>
<31348.1402415537@sss.pgh.pa.us>
List-Unsubscribe: <mailto:majordomo@postgresql.org?body=unsub%20pgsql-hackers>
On 2014-06-10 11:52:17 -0400, Tom Lane wrote:
> andres@anarazel.de (Andres Freund) writes:
> > On 2014-06-10 11:20:28 -0400, Tom Lane wrote:
> >> Maybe I'm mistaken, but I thought once the fork_process code has reset our
> >> process's setting to zero it's not possible to lower it again (without
> >> privileges we'd not have).
>
> > No, doesn't look that way. It's possible to reset it to the value set at
> > process start. So unless we introduce double forks for every backend
> > start it can be reset by ordinary processes.
>
> That's kind of annoying --- I wonder why they went to the trouble of doing
> that?
My guess is that they want to allow a process to only temporarily reduce
the likelihood of getting killed while it's doing something
important.
Greetings,
Andres Freund
--
Andres Freund http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
--
Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-hackers
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-hackers@postgresql.org
Cc: andres@anarazel.de, tgl@sss.pgh.pa.us, gurjeet@singh.im, peter_e@gmx.net
Subject: Re: /proc/self/oom_adj is deprecated in newer Linux kernels
In-Reply-To: <20140610155736.GP8406@alap3.anarazel.de>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox