Re: /proc/self/oom_adj is deprecated in newer Linux kernels

On Tue, Jun 10, 2014 at 11:52 AM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> andres(at)anarazel(dot)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? But anyway, it's probably not worth the cost of double-forking to
> prevent it. I still say though that this is not a reason to make it as
> easy as change-a-GUC to break the intended behavior.
>
> Robert's idea of having the start script set an environment variable to
> control the OOM adjustment reset seems like it would satisfy my concern.

I'm fine with this solution. Should this be a constant 0, or be
configurable based on env. variable's value?

--
Gurjeet Singh http://gurjeet.singh.im/

EDB www.EnterpriseDB.com