>
> Paul
>
> >
> > == 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.
> >
> >
> >
> > --
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> >
