cgroup debug

Signed-off-by: Tadeusz Struk <tadeusz.struk@linaro.org>
Change-Id: I5b2f8b97e4885490209346f586cd225309155e7c

kernel/cgroup/cgroup.c

@@ -958,6 +958,8 @@ void put_css_set_locked(struct css_set *cset)
 	/* This css_set is dead. unlink it and release cgroup and css refs */
 	for_each_subsys(ss, ssid) {
 		list_del(&cset->e_cset_node[ssid]);
+
+	printk("!!!! put_css_set_locked css_put(%llx) \n", cset->subsys[ssid]);
 		css_put(cset->subsys[ssid]);
 	}
 	hash_del(&cset->hlist);
@@ -966,8 +968,10 @@ void put_css_set_locked(struct css_set *cset)
 	list_for_each_entry_safe(link, tmp_link, &cset->cgrp_links, cgrp_link) {
 		list_del(&link->cset_link);
 		list_del(&link->cgrp_link);
-		if (cgroup_parent(link->cgrp))
+		if (cgroup_parent(link->cgrp)) {
+	printk("!!!! put_css_set_locked cgroup_put(self %llx) \n", &link->cgrp->self);
 			cgroup_put(link->cgrp);
+		}
 		kfree(link);
 	}
 
@@ -1581,6 +1585,7 @@ void cgroup_kn_unlock(struct kernfs_node *kn)
 	mutex_unlock(&cgroup_mutex);
 
 	kernfs_unbreak_active_protection(kn);
+	printk("!!!! cgroup_kn_unlock css_put(%llx) \n", &cgrp->self);
 	cgroup_put(cgrp);
 }
 
@@ -3156,6 +3161,7 @@ static void cgroup_apply_control_disable(struct cgroup *cgrp)
 
 			if (css->parent &&
 			    !(cgroup_ss_mask(dsct) & (1 << ss->id))) {
+				printk("!!!! control_disable kill_css(%llx) \n", css);
 				kill_css(css);
 			} else if (!css_visible(css)) {
 				css_clear_dir(css);
@@ -5142,6 +5148,7 @@ static void css_release(struct percpu_ref *ref)
 	struct cgroup_subsys_state *css =
 		container_of(ref, struct cgroup_subsys_state, refcnt);
 
+	printk("!!!! css_release enqueue(%llx) \n", css);
 	INIT_WORK(&css->destroy_work, css_release_work_fn);
 	queue_work(cgroup_destroy_wq, &css->destroy_work);
 }
@@ -5234,6 +5241,7 @@ static struct cgroup_subsys_state *css_create(struct cgroup *cgrp,
 	lockdep_assert_held(&cgroup_mutex);
 
 	css = ss->css_alloc(parent_css);
+	printk("!!!! css_create css %llx !!!!\n", css);
 	if (!css)
 		css = ERR_PTR(-ENOMEM);
 	if (IS_ERR(css))
@@ -5273,6 +5281,7 @@ static struct cgroup_subsys_state *css_create(struct cgroup *cgrp,
 	list_del_rcu(&css->sibling);
 err_free_css:
 	list_del_rcu(&css->rstat_css_node);
+	printk("!!!! css_create rcu_enqueue(%llx) !!!!\n", css);
 	INIT_RCU_WORK(&css->destroy_rwork, css_free_rwork_fn);
 	queue_rcu_work(cgroup_destroy_wq, &css->destroy_rwork);
 	return ERR_PTR(err);
@@ -5496,6 +5505,7 @@ static void css_killed_work_fn(struct work_struct *work)
 
 	do {
 		offline_css(css);
+	printk("!!!! css_killed_work_fn css_put(%llx) \n", css);
 		css_put(css);
 		/* @css can't go away while we're holding cgroup_mutex */
 		css = css->parent;
@@ -5510,7 +5520,9 @@ static void css_killed_ref_fn(struct percpu_ref *ref)
 	struct cgroup_subsys_state *css =
 		container_of(ref, struct cgroup_subsys_state, refcnt);
 
+
 	if (atomic_dec_and_test(&css->online_cnt)) {
+	printk("!!!! css_killed_ref_fn enqueue(%llx) \n", css);
 		INIT_WORK(&css->destroy_work, css_killed_work_fn);
 		queue_work(cgroup_destroy_wq, &css->destroy_work);
 	}
@@ -6602,6 +6614,7 @@ void cgroup_sk_free(struct sock_cgroup_data *skcd)
 	if (skcd->no_refcnt)
 		return;
 	cgroup_bpf_put(cgrp);
+printk("!!!! cgroup_sk_free cgroup_put(css %llx)\n", &cgrp->self);
 	cgroup_put(cgrp);
 }