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Confused as to the point of this.

Confused as to the point of this.

Posted Jun 24, 2013 16:10 UTC (Mon) by sbohrer (guest, #61058)
In reply to: Confused as to the point of this. by mezcalero
Parent article: Changes coming for systemd and control groups

This implies a user-kernel ABI change does it not? Are these not forbidden?


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Confused as to the point of this.

Posted Jun 24, 2013 16:32 UTC (Mon) by mezcalero (guest, #45103) [Link]

Well, the kernel will support the split scheme at the same time as the unified one for some time, so there will be a somewhat "soft" transition. On the systemd side you will be able to tell it to leave the fingers of some controllers and then do you own thing with those controllers. But in the long run OSes which use systemd will have systemd taking possession of all relevant controllers.

This all is gradual thing: the kernel will support split AND unified hiearchies for a time, and so will systemd. Then, systemd will allow other code to change the cgroup fs for some time, but eventually will be more restrictive and log every such change. In the long run on systemd systems we'll enforce single-hierarchy and single-writer strictly.

Confused as to the point of this.

Posted Jun 24, 2013 21:08 UTC (Mon) by khim (subscriber, #9252) [Link]

It's a rule, not law. There are couple of exceptions: even though user-space interfaces are supposed to be maintained forever, they sometimes do change—after a long deprecation period and If there's nobody around to see it, did it really break?

cgroups will obviously follow the slow path


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