linux-kernel - Re: counting file descriptors with a cgroup controller

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Date:   Wed, 08 Mar 2017 11:19:31 +0100
From:   Krzysztof Opasiak <k.opasiak@...sung.com>
To:     Parav Pandit <pandit.parav@...il.com>, Tejun Heo <tj@...nel.org>
Cc:     Li Zefan <lizefan@...wei.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Łukasz Stelmach <l.stelmach@...sung.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Karol Lewandowski <k.lewandowsk@...sung.com>,
        cgroups@...r.kernel.org
Subject: Re: counting file descriptors with a cgroup controller



On 03/08/2017 03:59 AM, Parav Pandit wrote:
> Hi,
>
> On Tue, Mar 7, 2017 at 2:48 PM, Tejun Heo <tj@...nel.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?

They wont.

> Do you mean you want to keep restarting them when it reaches the limit?

We'd like to restart them each time when they reach limit declared by 
developer.

Best regards,
-- 
Krzysztof Opasiak
Samsung R&D Institute Poland
Samsung Electronics