On Tue, Mar 24, 2015 at 4:29 AM, WaLyong Cho <walyong....@samsung.com> wrote: > Could anyone explain why?
An admin using CPUShares= or a similar proportional CGroup controller probably assumes that setting the shares to twice the default (for example) increases the relative proportion of resources for that unit. However, that is only true if other units competing for that resource have the same controller(s) enabled so that the kernel knows to balance the resources accordingly. The code in systemd ensures that if any unit uses a proportional CGroups controller in a slice, all other units in that same slice enable that controller as well, usually with the default proportions. unit_get_target_mask() is part of an optimization I added so that initializing CGroups controllers for a given unit doesn't require iterating through every other unit in a slice to figure out the necessary controllers. It provides a bitmask indicating the controllers in use by its siblings so the unit can enable, say, CPUShares= if one of its siblings is doing so. _______________________________________________ systemd-devel mailing list systemd-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/systemd-devel
