diff options
author | Tejun Heo <tj@kernel.org> | 2011-12-12 18:12:22 -0800 |
---|---|---|
committer | Tejun Heo <tj@kernel.org> | 2011-12-12 18:12:22 -0800 |
commit | 494c167cf76d02000adf740c215adc69a824ecc9 (patch) | |
tree | bf7cdf462b62ebf099b965f7bea503df30918c17 /kernel | |
parent | 94196f51c1ee5bbad674de28c682b17d78adb8e6 (diff) |
cgroup: kill subsys->can_attach_task(), pre_attach() and attach_task()
These three methods are no longer used. Kill them.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Reviewed-by: Frederic Weisbecker <fweisbec@gmail.com>
Acked-by: Paul Menage <paul@paulmenage.org>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Diffstat (limited to 'kernel')
-rw-r--r-- | kernel/cgroup.c | 52 |
1 files changed, 5 insertions, 47 deletions
diff --git a/kernel/cgroup.c b/kernel/cgroup.c index 41ee01e392e..1b3b84174ea 100644 --- a/kernel/cgroup.c +++ b/kernel/cgroup.c @@ -1944,13 +1944,6 @@ int cgroup_attach_task(struct cgroup *cgrp, struct task_struct *tsk) goto out; } } - if (ss->can_attach_task) { - retval = ss->can_attach_task(cgrp, tsk); - if (retval) { - failed_ss = ss; - goto out; - } - } } retval = cgroup_task_migrate(cgrp, oldcgrp, tsk, false); @@ -1958,10 +1951,6 @@ int cgroup_attach_task(struct cgroup *cgrp, struct task_struct *tsk) goto out; for_each_subsys(root, ss) { - if (ss->pre_attach) - ss->pre_attach(cgrp); - if (ss->attach_task) - ss->attach_task(cgrp, tsk); if (ss->attach) ss->attach(ss, cgrp, &tset); } @@ -2093,7 +2082,6 @@ int cgroup_attach_proc(struct cgroup *cgrp, struct task_struct *leader) { int retval, i, group_size, nr_migrating_tasks; struct cgroup_subsys *ss, *failed_ss = NULL; - bool cancel_failed_ss = false; /* guaranteed to be initialized later, but the compiler needs this */ struct css_set *oldcg; struct cgroupfs_root *root = cgrp->root; @@ -2188,21 +2176,6 @@ int cgroup_attach_proc(struct cgroup *cgrp, struct task_struct *leader) goto out_cancel_attach; } } - /* a callback to be run on every thread in the threadgroup. */ - if (ss->can_attach_task) { - /* run on each task in the threadgroup. */ - for (i = 0; i < group_size; i++) { - tc = flex_array_get(group, i); - if (tc->cgrp == cgrp) - continue; - retval = ss->can_attach_task(cgrp, tc->task); - if (retval) { - failed_ss = ss; - cancel_failed_ss = true; - goto out_cancel_attach; - } - } - } } /* @@ -2234,15 +2207,10 @@ int cgroup_attach_proc(struct cgroup *cgrp, struct task_struct *leader) } /* - * step 3: now that we're guaranteed success wrt the css_sets, proceed - * to move all tasks to the new cgroup, calling ss->attach_task for each - * one along the way. there are no failure cases after here, so this is - * the commit point. + * step 3: now that we're guaranteed success wrt the css_sets, + * proceed to move all tasks to the new cgroup. There are no + * failure cases after here, so this is the commit point. */ - for_each_subsys(root, ss) { - if (ss->pre_attach) - ss->pre_attach(cgrp); - } for (i = 0; i < group_size; i++) { tc = flex_array_get(group, i); /* leave current thread as it is if it's already there */ @@ -2250,18 +2218,11 @@ int cgroup_attach_proc(struct cgroup *cgrp, struct task_struct *leader) continue; retval = cgroup_task_migrate(cgrp, tc->cgrp, tc->task, true); BUG_ON(retval); - /* attach each task to each subsystem */ - for_each_subsys(root, ss) { - if (ss->attach_task) - ss->attach_task(cgrp, tc->task); - } } /* nothing is sensitive to fork() after this point. */ /* - * step 4: do expensive, non-thread-specific subsystem callbacks. - * TODO: if ever a subsystem needs to know the oldcgrp for each task - * being moved, this call will need to be reworked to communicate that. + * step 4: do subsystem attach callbacks. */ for_each_subsys(root, ss) { if (ss->attach) @@ -2285,11 +2246,8 @@ out_cancel_attach: /* same deal as in cgroup_attach_task */ if (retval) { for_each_subsys(root, ss) { - if (ss == failed_ss) { - if (cancel_failed_ss && ss->cancel_attach) - ss->cancel_attach(ss, cgrp, &tset); + if (ss == failed_ss) break; - } if (ss->cancel_attach) ss->cancel_attach(ss, cgrp, &tset); } |