Am 29.10.2013 17:52, schrieb Kay Sievers: >> None of this explains why systemd no longer applies certain controllers >> by default. Previously, systemd would attach cpu controllers to each >> service by default. Now, it only groups your processes in the systemd >> tree, but does not touch any cgroup controllers. >> >> The new default behaviour (or lack thereof) seems like a step back to me. > > It's a property of a unit now which cgroup controllers get attached: > > http://www.freedesktop.org/software/systemd/man/systemd.resource-control.html > > The global mirroring across trees makes no sense in the future. The > several independent trees will go away in the kernel next year, and > then systemd would not know what to do with an instruction like > DefaultControllers.
I realized that when I set the CPUShares attribute on any unit, systemd mirrors the whole cgroup tree into the cpu,cpuacct tree. However, in the past, it was mirrored regardless of such setting. This had the benefit that CPU was equally distributed among services, not among processes. That benefit is now gone if I choose to not configure any cpu settings.
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