From nobody Mon Aug  2 19:58:08 2021
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Subject: Re: POSIX shared memory, jails, and (lack of) limits
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To: Mark Johnston <markj@freebsd.org>
Cc: Michael Gmelin <freebsd@grem.de>, jail@freebsd.org,
 Konstantin Belousov <kostikbel@gmail.com>
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Date: Mon, 2 Aug 2021 21:58:08 +0200
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Reply-To: thomas@gibfest.dk
From: Thomas Steen Rasmussen via jail <jail@freebsd.org>
X-Original-From: Thomas Steen Rasmussen <thomas@gibfest.dk>
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On 8/2/21 9:40 PM, Mark Johnston wrote:
> Cyril has written a few patches for racct, including one which includes
> POSIX shared memory objects in rctl's "nshm" and "shmsize" resources,
> which currently only apply to SysV shm objects:
> https://reviews.freebsd.org/D30775
> We plan to get them committed in the next couple of weeks.
> 
Hello,

I haven't looked at it for a bit, but the last time I tried to use 
sysutils/jail_exporter to get graphs for jail resource usage the graphs 
for Postgres jails were hilariously wrong, which I believe I tracked 
down to shared memory being counted more than once.

I gave up trying to figure out how to fix it and just lived with Grafana 
telling me a postgres jail on a 128gb jailhost used 900gb of memory.

But it sounds like the above might fix this?

Thanks!

Best regards,

Thomas Steen Rasmussen