Hi - This is a patch of a new optional function for task assignment to cgroup, RFC. == Purpose ================================================= To provide the function that leads a task, corresponding to the conditions specified beforehand, to a specific cgroup directory. == Description ============================================= This patch provides the function that leads a task, corresponding to the conditions specified beforehand, to a specific cgroup directory. Currently, this patch uses user-id as a condition to lead a task. On its I/F, specifies user-id of a task and a cgroup directory. The task set to specified user-id will automatically lead to the cgroup directory. (it is attached to specific cgroup) This function makes possible to attach a task to cgroup automatically when specific user logs in, also to attach a task of a service which is set to specific effective user-id to specific cgroup mechanically. This function is just option, all the functions of cgroup are the same. Also the migration of a task between cgroup directories can do by rewriting pid of a control tasks file, including a task leading by this option. It is able to enter two or more set of user-id and cgroup directory. Specified cgroup directory may be the same or that may not be. But it's not able to enter same user-id to plural cgroup directories to lead. == Interface =============================================== /lead_option - control file of this option [example for reading a configuration] # cat /cgroup/lead_option uid:202 leadto:/cpuset/bar_cg uid:201 leadto:/cpuset/foo_cg * nothing appears before assignment. [example for adding an entry] - To lead a task(uid 201) to /cgroup/foo_cg # echo uid:201 leadto:/cpuset/foo_cg > /cpuset/lead_option * set a uid of task and cgroup dirctory to lead. * Remake an entry uid to cgroup directory if set uid already exists. [example for delete an entry] - To delete an entry of uid # echo uid:201 > /cpuset/lead_option * To delete a registration, omit "leadto:" token. == Operation example (chronological order) ================== The follows is an example of the operation. # ############################ # # Various confirmation before testing # ############################ # id uid=0(root) gid=0(root) groups=0(root) # df /cpuset Filesystem 1K-blocks Used Available Use% Mounted on none 0 0 0 - /cpuset # more /proc/self/cgroup cpuset:/ # id foo uid=201(foo) gid=100(users) groups=100(users) # id bar uid=202(foo) gid=100(users) groups=100(users) # ############################ # # Add an entry of user foo,bar # ############################ # echo uid:201 leadto:/cpuset/foo_cg > /cpuset/lead_option # echo uid:202 leadto:/cpuset/bar_cg > /cpuset/lead_option # more /cpuset/lead_option uid:202 leadto:/cpuset/bar_cg uid:201 leadto:/cpuset/foo_cg # ############################ # # Confirmation of the assignment of user foo,bar - (1) # ############################ # su - foo $ more /proc/$$/cgroup cpuset:/foo_cg $ more /proc/self/cgroup cpuset:/foo_cg $ su bar --command "more /proc/self/cgroup" cpuset:/bar_cg $ exit # ############################ # # Delete an entry of user foo,bar # ############################ # echo uid:201 > /cpuset/lead_option # echo uid:202 > /cpuset/lead_option # more /cpuset/lead_option # ############################ # # Confirmation of the assignment of user foo,bar - (2) # ############################ # su - foo $ more /proc/$$/cgroup cpuset:/ $ su bar --command "more /proc/self/cgroup" cpuset:/ $ Thanks, - Kazunaga Ikeno. _______________________________________________ Containers mailing list Containers@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/containers