b6629c4b9f82f5801af186e975b0220bf066ddbe
SYSTEMD_CGROUP_CONTROLLER is currently defined as "name=systemd" which cgroup utility functions interpret as a named cgroup hierarchy with the specified named. With the planned cgroup hybrid mode changes, SYSTEMD_CGROUP_CONTROLLER would map to different hierarchy names. This patch makes SYSTEMD_CGROUP_CONTROLLER a special string "_systemd" which is substituted to "name=systemd" by the cgroup utility functions. This allows the callers to address the systemd hierarchy without actually specifying the hierarchy name allowing the cgroup utility functions to map it to whatever is appropriate. Note that SYSTEMD_CGROUP_CONTROLLER was already special on full unified cgroup hierarchy even before this patch.
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