[systemd-devel] systemd and cgroups

[Thomas Bächler]

Am 13.01.2014 02:47, schrieb Kay Sievers:
> On Mon, Jan 13, 2014 at 8:07 AM, Greg KH <gregkh at linuxfoundation.org> wrote:
>> On Sun, Jan 12, 2014 at 11:48:56PM +0100, Dominique Michel wrote:
>>> I need that pc for production, so I rapidly installed another
>>> distribution without systemd. So this problem is solved for me, but
>>> that doesn't solve that to force any user to use a default
>>> configuration without any possibility of user setup, and without
>>> documentation that can allow an user to do that, is just a design fault.
>>
>> That sounds like a distro issue, please take this up with your distro
>> developers, this isn't a systemd issue.
> 
> http://www.freedesktop.org/wiki/Software/systemd/MyServiceCantGetRealtime/

Let me quote from that:

"By default systemd places all system services into their own control
groups in the "cpu" hierarchy."

That is not true anymore since systemd 207 IIRC (whenever the whole
cgroup rework started, I might have the version number wrong). In fact,
systemd only puts services into the own cpu control group once you
explicitly set the CPUShares for a service.

"Instead of evening out CPU per process this will cause CPU to be evened
out per service."

This benefit has been lost with systemd 207, at least it is not the
default behaviour anymore.


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