[systemd-devel] Where the pid=1 limits come from when using systemd

[Jeffrey Zhang]

After some search, i guess the pid=1 limits come from the nr_open now and
the default nr_open
come from linux code[0].

So there should be no way to change the pid=1 limit unless you re-compile
your kernel with some code change.

[0] https://github.com/torvalds/linux/blob/master/fs/file.c#L22-L27

On Tue, Oct 9, 2018 at 1:40 PM Jeffrey Zhang <zhang.lei.fly at gmail.com>
wrote:

> Thanks Richard,
>
> That explains why archlinux NOFILE is 1048576. archlinux is using systemd
> 239.2-1
>
> But it still can not explain where the pid=1 process limits come from? is
> there any way to change it?
>
> On Tue, Oct 9, 2018 at 1:31 PM Richard W <ellrywych at gmail.com> wrote:
>
>> There's an issue on github on this:
>> https://github.com/systemd/systemd/issues/6559
>>
>> On Tue, Oct 9, 2018 at 9:42 AM Jeffrey Zhang <zhang.lei.fly at gmail.com>
>> wrote:
>>
>>> hey guys,
>>>
>>> In the recently test, i found some interesting phenomenon.
>>>
>>> in systemd service, if i configure LimitNOFILE=infinity, it is not a
>>> real infinity. the finally NOFILE will be 65536 ( on centos7 ) and 1048576
>>> ( on archlinux), and the pid=1 process also have the same value.
>>>
>>> So my question is,
>>>
>>> 1. where the pid=1 limits come from? because centos7 and archlinux are
>>> different, so i guess this should be configurable or pre-compiled.
>>> 2. is the inifinity equals pid=1 limits in default?
>>>
>>> --
>>> Regards,
>>> Jeffrey Zhang
>>> Blog: http://xcodest.me
>>> _______________________________________________
>>> systemd-devel mailing list
>>> systemd-devel at lists.freedesktop.org
>>> https://lists.freedesktop.org/mailman/listinfo/systemd-devel
>>>
>>
>
> --
> Regards,
> Jeffrey Zhang
> Blog: http://xcodest.me
>


-- 
Regards,
Jeffrey Zhang
Blog: http://xcodest.me
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