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Message-Id: <1314138000-2049-7-git-send-email-tj@kernel.org>
Date: Wed, 24 Aug 2011 00:20:00 +0200
From: Tejun Heo <tj@...nel.org>
To: rjw@...k.pl, paul@...lmenage.org, lizf@...fujitsu.com
Cc: linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
containers@...ts.linux-foundation.org, Tejun Heo <tj@...nel.org>
Subject: [PATCH 6/6] 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@...nel.org>
Cc: Paul Menage <paul@...lmenage.org>
Cc: Li Zefan <lizf@...fujitsu.com>
---
include/linux/cgroup.h | 3 --
kernel/cgroup.c | 53 ++++-------------------------------------------
2 files changed, 5 insertions(+), 51 deletions(-)
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 2470c8e..5659d37 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -490,11 +490,8 @@ struct cgroup_subsys {
void (*destroy)(struct cgroup_subsys *ss, struct cgroup *cgrp);
int (*can_attach)(struct cgroup_subsys *ss, struct cgroup *cgrp,
struct cgroup_taskset *tset);
- int (*can_attach_task)(struct cgroup *cgrp, struct task_struct *tsk);
void (*cancel_attach)(struct cgroup_subsys *ss, struct cgroup *cgrp,
struct cgroup_taskset *tset);
- void (*pre_attach)(struct cgroup *cgrp);
- void (*attach_task)(struct cgroup *cgrp, struct task_struct *tsk);
void (*attach)(struct cgroup_subsys *ss, struct cgroup *cgrp,
struct cgroup_taskset *tset);
void (*fork)(struct cgroup_subsys *ss, struct task_struct *task);
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 474674b..374a4cb 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -1926,13 +1926,6 @@ 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);
@@ -1940,10 +1933,6 @@ 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);
}
@@ -2075,7 +2064,6 @@ int cgroup_attach_proc(struct cgroup *cgrp, struct task_struct *leader)
{
int retval, i, group_size, nr_todo;
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;
@@ -2166,21 +2154,6 @@ 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;
- }
- }
- }
}
/*
@@ -2217,15 +2190,10 @@ 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 */
@@ -2235,19 +2203,11 @@ int cgroup_attach_proc(struct cgroup *cgrp, struct task_struct *leader)
/* if the thread is PF_EXITING, it can just get skipped. */
retval = cgroup_task_migrate(cgrp, tc->cgrp, tc->task, true);
BUG_ON(retval != 0 && retval != -ESRCH);
-
- /* 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)
@@ -2271,11 +2231,8 @@ 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);
}
--
1.7.6
--
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