Re: counting file descriptors with a cgroup controller

From	Parav Pandit <pandit.parav@gmail.com>
Newsgroups	linux.kernel
Subject	Re: counting file descriptors with a cgroup controller
Date	2017-03-08 04:10 +0100
Message-ID	<tiA9c-le-7@gated-at.bofh.it> (permalink)
References	(3 earlier) <ti6b7-49O-1@gated-at.bofh.it> <timzf-7wm-19@gated-at.bofh.it> <tithn-3Jt-13@gated-at.bofh.it> <titAK-46W-11@gated-at.bofh.it> <tiA9c-le-9@gated-at.bofh.it>
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Hi,

On Tue, Mar 7, 2017 at 2:48 PM, Tejun Heo <tj@kernel.org> wrote:
>
> Hello,
>
> On Tue, Mar 07, 2017 at 09:06:49PM +0100, Krzysztof Opasiak wrote:
> > Personally, I don't want to use rlimit for this as it ends up returning
> > error code from for example open() when we hit the limit. This may lead to
> > some unpredictable crashes in  services (esp. those poor proprietary binary
> > blobs). Instead of injecting errors to service we would like to just get
> > notification that this service has more opened fds than it should and ask it
> > to restart in a polite way.
> >

How does those poor proprietary binary blobs remain polite after restart?
Do you mean you want to keep restarting them when it reaches the limit?

> > For memory seems to be quite easy to achieve as we can just get eventfd
> > notification when application passes given memory usage using memory cgroup
> > controller. Maybe you know some efficient method to do the same for fds?
>
> So, if all you wanna do is reliably detecting open(2) failures, can't
> you do that with bpf tracing?
>
> Thanks.
>
> --
> tejun
> --
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Thread

Re: counting file descriptors with a cgroup controller Tejun Heo <tj@kernel.org> - 2017-03-06 20:10 +0100
  Re: counting file descriptors with a cgroup controller Krzysztof Opasiak <k.opasiak@samsung.com> - 2017-03-07 13:40 +0100
    Re: counting file descriptors with a cgroup controller Tejun Heo <tj@kernel.org> - 2017-03-07 20:50 +0100
      Re: counting file descriptors with a cgroup controller Krzysztof Opasiak <k.opasiak@samsung.com> - 2017-03-07 21:10 +0100
        Re: counting file descriptors with a cgroup controller Parav Pandit <pandit.parav@gmail.com> - 2017-03-08 04:10 +0100
          Re: counting file descriptors with a cgroup controller Krzysztof Opasiak <k.opasiak@samsung.com> - 2017-03-08 11:30 +0100
        Re: counting file descriptors with a cgroup controller Krzysztof Opasiak <k.opasiak@samsung.com> - 2017-03-08 13:10 +0100
          Re: counting file descriptors with a cgroup controller Tejun Heo <tj@kernel.org> - 2017-03-08 20:10 +0100
        Re: counting file descriptors with a cgroup controller Tejun Heo <tj@kernel.org> - 2017-03-08 15:50 +0100

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