Re: counting file descriptors with a cgroup controller

From: Krzysztof Opasiak
Date: Fri Feb 17 2017 - 06:37:35 EST

+ cgroups mailing list
+ cgroup maintainers

On 02/17/2017 10:37 AM, Åukasz Stelmach wrote:
> Hi,
> We need to limit and monitor the number of file descriptors processes
> keep open. If a process exceeds certain limit we'd like to terminate it
> and restart it or reboot the whole system. Currently the RLIMIT API
> allows limiting the number of file descriptors but to achieve our goals
> we'd need to make sure all programmes we run handle EMFILE errno
> properly. That is why we consider developing a cgroup controller that
> limits the number of open file descriptors of its members (similar to
> memory controler).
> Any comments? Is there any alternative that:
> + does not require modifications of user-land code,
> + enables other process (e.g. init) to be notified and apply policy.
> Kind regards,

Krzysztof Opasiak
Samsung R&D Institute Poland
Samsung Electronics