From: Tom Lane <tgl@sss.pgh.pa.us>
To: pgsql-hackers@postgreSQL.org
Subject: /proc/self/oom_adj is deprecated in newer Linux kernels
Date: Fri, 16 Sep 2011 10:57:53 -0400
Message-ID: <29121.1316185073@sss.pgh.pa.us> (raw)
While testing 9.1 RPMs on Fedora 15 (2.6.40 kernel), I notice
messages like these in the kernel log:
Sep 11 13:38:56 rhl kernel: [ 415.308092] postgres (18040): /proc/18040/oom_adj is deprecated, please use /proc/18040/oom_score_adj instead.
These don't show up on every single PG process launch, but that probably
just indicates there's a rate-limiter in the kernel reporting mechanism.
So it looks like it behooves us to cater for oom_score_adj in the
future. The simplest, least risky change that I can think of is to
copy-and-paste the relevant #ifdef code block in fork_process.c.
If we do that, then it would be up to the packager whether to #define
LINUX_OOM_ADJ or LINUX_OOM_SCORE_ADJ or both depending on the behavior
he wants.
That would be good enough for my own purposes in building Fedora/RHEL
packages, since I can predict with confidence which kernel versions a
given build is likely to be used with. I think probably the same
would be true for most other distro-specific builds. Does anyone want
to argue for doing something more complicated, and if so what exactly?
regards, tom lane
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To: pgsql-hackers@postgresql.org
Cc: tgl@sss.pgh.pa.us
Subject: Re: /proc/self/oom_adj is deprecated in newer Linux kernels
In-Reply-To: <29121.1316185073@sss.pgh.pa.us>
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