[Nix-dev] Using Nixpkgs outside of NixOS

[Michael Raskin]

>too bad :-) Thanks for the find!

By the way, note that PID-1-only cgroups management is a systemd 
decision, as far as I understand from the kernel mailing list posts, the
interface will still be a filesystem, and apparently it is OK to 
implement cgroup management by multiple root processes (i.e. not 
a migration to a single open socket).

>
>On Wed, Jun 4, 2014 at 8:14 AM, Kirill Elagin <kirelagin at gmail.com> wrote:
>
>> http://www.freedesktop.org/wiki/Software/systemd/ControlGroupInterface/
>>
>> http://cgit.freedesktop.org/systemd/systemd/tree/src/core/main.c#n1469
>>
>>
>> --
>> Кирилл Елагин
>>
>>
>> On Wed, Jun 4, 2014 at 1:21 AM, Wout Mertens <wout.mertens at gmail.com>
>> wrote:
>>
>>> On Tue, Jun 3, 2014 at 8:30 PM, Kirill Elagin <kirelagin at gmail.com>
>>> wrote:
>>>
>>>>  Obviously systemd would then have to not do things that udev etc are
>>>>> already doing... Just running services, opening sockets, handling cgroups...
>>>>>
>>>>
>>>> I doubt systemd can do this.
>>>> First of all, with the new kernel cgroups interface only PID 1 can
>>>> manage cgroups (on the kernel level).
>>>> Then, to properly handle services (i.e. processes) systemd has to be PID
>>>> 1, right? Because otherwise it won't be able to track dead processes and
>>>> all this stuff.
>>>>
>>>
>>> Are you sure about PID 1? I can't find that in
>>> https://www.kernel.org/doc/Documentation/cgroups/cgroups.txt
>>>
>>> I'm thinking systemd can run in user-mode, even if it's running as root.
>>> It's automatically turned on when it's not PID 1, I need to try it.
>>>
>>> Wout.
>>>
>>
>>
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><div dir="ltr">too bad :-) Thanks for the find!</div><div class="gmail_extra"><br><br><div class="gmail_quote">On Wed, Jun 4, 2014 at 8:14 AM, Kirill Elagin <span dir="ltr">&lt;<a href="mailto:kirelagin at gmail.com" target="_blank">kirelagin at gmail.com</a>&gt;</span> wrote:<br>
><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><a href="http://www.freedesktop.org/wiki/Software/systemd/ControlGroupInterface/" target="_blank">http://www.freedesktop.org/wiki/Software/systemd/ControlGroupInterface/</a><br>
><br><a href="http://cgit.freedesktop.org/systemd/systemd/tree/src/core/main.c#n1469" target="_blank">http://cgit.freedesktop.org/systemd/systemd/tree/src/core/main.c#n1469</a><br>
>
></div><div class="gmail_extra"><br clear="all"><div><div dir="ltr"><div><br></div>--<br>Кирилл Елагин</div></div><div><div class="h5">
><br><br><div class="gmail_quote">On Wed, Jun 4, 2014 at 1:21 AM, Wout Mertens <span dir="ltr">&lt;<a href="mailto:wout.mertens at gmail.com" target="_blank">wout.mertens at gmail.com</a>&gt;</span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
>
>
><div dir="ltr"><div><div><div class="gmail_extra"><div class="gmail_quote">On Tue, Jun 3, 2014 at 8:30 PM, Kirill Elagin <span dir="ltr">&lt;<a href="mailto:kirelagin at gmail.com" target="_blank">kirelagin at gmail.com</a>&gt;</span> wrote:<br>
>
>
>
><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div dir="ltr"><div class="gmail_extra"><div><div class="gmail_quote">
>
>
>
><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div dir="ltr"><div class="gmail_extra"><div class="gmail_quote">
>
>
>
>
>
><div class="gmail_extra">Obviously systemd would then have to not do things that udev etc are already doing... Just running services, opening sockets, handling cgroups...</div></div></div></div></blockquote></div><br></div>
>
>
>
>I doubt systemd can do this.<br>
>
>First of all, with the new kernel cgroups interface only PID 1 can manage cgroups (on the kernel level).<br>Then, to properly handle services (i.e. processes) systemd has to be PID 1, right? Because otherwise it won&#39;t be able to track dead processes and all this stuff.<br>
>
>
>
>
>
></div></div>
></blockquote></div><br></div></div></div><div class="gmail_extra">Are you sure about PID 1? I can&#39;t find that in <a href="https://www.kernel.org/doc/Documentation/cgroups/cgroups.txt" target="_blank">https://www.kernel.org/doc/Documentation/cgroups/cgroups.txt</a></div>
>
>
>
><div class="gmail_extra"><br></div><div class="gmail_extra">I&#39;m thinking systemd can run in user-mode, even if it&#39;s running as root. It&#39;s automatically turned on when it&#39;s not PID 1, I need to try it.</div>
>
>
><span><font color="#888888">
><div class="gmail_extra"><br></div><div class="gmail_extra">Wout.</div></font></span></div>
></blockquote></div><br></div></div></div>
></blockquote></div><br></div>
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