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[PATCH-cgroup 2/5] cgroup: Move debug cgroup to its own file

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The debug cgroup currently resides within cgroup-v1.c and is enabled
only for v1 cgroup. To enable the debug cgroup also for v2, it makes
sense to put the code into its own file as it will no longer be v1
specific. There is no change to the debug cgroup specific code.

Signed-off-by: Waiman Long <longman@redhat.com>
---
 kernel/cgroup/Makefile          |   1 +
 kernel/cgroup/cgroup-internal.h |   2 +
 kernel/cgroup/cgroup-v1.c       | 149 +-------------------------------------
 kernel/cgroup/debug.c           | 153 ++++++++++++++++++++++++++++++++++++++++
 4 files changed, 157 insertions(+), 148 deletions(-)
 create mode 100644 kernel/cgroup/debug.c

diff --git a/kernel/cgroup/Makefile b/kernel/cgroup/Makefile
index 387348a..ce693cc 100644
--- a/kernel/cgroup/Makefile
+++ b/kernel/cgroup/Makefile
@@ -4,3 +4,4 @@ obj-$(CONFIG_CGROUP_FREEZER) += freezer.o
 obj-$(CONFIG_CGROUP_PIDS) += pids.o
 obj-$(CONFIG_CGROUP_RDMA) += rdma.o
 obj-$(CONFIG_CPUSETS) += cpuset.o
+obj-$(CONFIG_CGROUP_DEBUG) += debug.o
diff --git a/kernel/cgroup/cgroup-internal.h b/kernel/cgroup/cgroup-internal.h
index 2c8e3a9..0e81c61 100644
--- a/kernel/cgroup/cgroup-internal.h
+++ b/kernel/cgroup/cgroup-internal.h
@@ -192,6 +192,8 @@ void cgroup_procs_write_finish(struct task_struct *task)
 int cgroup_show_path(struct seq_file *sf, struct kernfs_node *kf_node,
 		     struct kernfs_root *kf_root);
 
+int cgroup_task_count(const struct cgroup *cgrp);
+
 /*
  * namespace.c
  */
diff --git a/kernel/cgroup/cgroup-v1.c b/kernel/cgroup/cgroup-v1.c
index 9bbd4ef..fcbdb09 100644
--- a/kernel/cgroup/cgroup-v1.c
+++ b/kernel/cgroup/cgroup-v1.c
@@ -335,7 +335,7 @@ static struct cgroup_pidlist *cgroup_pidlist_find_create(struct cgroup *cgrp,
  * cgroup_task_count - count the number of tasks in a cgroup.
  * @cgrp: the cgroup in question
  */
-static int cgroup_task_count(const struct cgroup *cgrp)
+int cgroup_task_count(const struct cgroup *cgrp)
 {
 	int count = 0;
 	struct cgrp_cset_link *link;
@@ -1307,150 +1307,3 @@ static int __init cgroup_no_v1(char *str)
 	return 1;
 }
 __setup("cgroup_no_v1=", cgroup_no_v1);
-
-
-#ifdef CONFIG_CGROUP_DEBUG
-static struct cgroup_subsys_state *
-debug_css_alloc(struct cgroup_subsys_state *parent_css)
-{
-	struct cgroup_subsys_state *css = kzalloc(sizeof(*css), GFP_KERNEL);
-
-	if (!css)
-		return ERR_PTR(-ENOMEM);
-
-	return css;
-}
-
-static void debug_css_free(struct cgroup_subsys_state *css)
-{
-	kfree(css);
-}
-
-static u64 debug_taskcount_read(struct cgroup_subsys_state *css,
-				struct cftype *cft)
-{
-	return cgroup_task_count(css->cgroup);
-}
-
-static u64 current_css_set_read(struct cgroup_subsys_state *css,
-				struct cftype *cft)
-{
-	return (u64)(unsigned long)current->cgroups;
-}
-
-static u64 current_css_set_refcount_read(struct cgroup_subsys_state *css,
-					 struct cftype *cft)
-{
-	u64 count;
-
-	rcu_read_lock();
-	count = refcount_read(&task_css_set(current)->refcount);
-	rcu_read_unlock();
-	return count;
-}
-
-static int current_css_set_cg_links_read(struct seq_file *seq, void *v)
-{
-	struct cgrp_cset_link *link;
-	struct css_set *cset;
-	char *name_buf;
-
-	name_buf = kmalloc(NAME_MAX + 1, GFP_KERNEL);
-	if (!name_buf)
-		return -ENOMEM;
-
-	spin_lock_irq(&css_set_lock);
-	rcu_read_lock();
-	cset = rcu_dereference(current->cgroups);
-	list_for_each_entry(link, &cset->cgrp_links, cgrp_link) {
-		struct cgroup *c = link->cgrp;
-
-		cgroup_name(c, name_buf, NAME_MAX + 1);
-		seq_printf(seq, "Root %d group %s\n",
-			   c->root->hierarchy_id, name_buf);
-	}
-	rcu_read_unlock();
-	spin_unlock_irq(&css_set_lock);
-	kfree(name_buf);
-	return 0;
-}
-
-#define MAX_TASKS_SHOWN_PER_CSS 25
-static int cgroup_css_links_read(struct seq_file *seq, void *v)
-{
-	struct cgroup_subsys_state *css = seq_css(seq);
-	struct cgrp_cset_link *link;
-
-	spin_lock_irq(&css_set_lock);
-	list_for_each_entry(link, &css->cgroup->cset_links, cset_link) {
-		struct css_set *cset = link->cset;
-		struct task_struct *task;
-		int count = 0;
-
-		seq_printf(seq, "css_set %pK\n", cset);
-
-		list_for_each_entry(task, &cset->tasks, cg_list) {
-			if (count++ > MAX_TASKS_SHOWN_PER_CSS)
-				goto overflow;
-			seq_printf(seq, "  task %d\n", task_pid_vnr(task));
-		}
-
-		list_for_each_entry(task, &cset->mg_tasks, cg_list) {
-			if (count++ > MAX_TASKS_SHOWN_PER_CSS)
-				goto overflow;
-			seq_printf(seq, "  task %d\n", task_pid_vnr(task));
-		}
-		continue;
-	overflow:
-		seq_puts(seq, "  ...\n");
-	}
-	spin_unlock_irq(&css_set_lock);
-	return 0;
-}
-
-static u64 releasable_read(struct cgroup_subsys_state *css, struct cftype *cft)
-{
-	return (!cgroup_is_populated(css->cgroup) &&
-		!css_has_online_children(&css->cgroup->self));
-}
-
-static struct cftype debug_files[] =  {
-	{
-		.name = "taskcount",
-		.read_u64 = debug_taskcount_read,
-	},
-
-	{
-		.name = "current_css_set",
-		.read_u64 = current_css_set_read,
-	},
-
-	{
-		.name = "current_css_set_refcount",
-		.read_u64 = current_css_set_refcount_read,
-	},
-
-	{
-		.name = "current_css_set_cg_links",
-		.seq_show = current_css_set_cg_links_read,
-	},
-
-	{
-		.name = "cgroup_css_links",
-		.seq_show = cgroup_css_links_read,
-	},
-
-	{
-		.name = "releasable",
-		.read_u64 = releasable_read,
-	},
-
-	{ }	/* terminate */
-};
-
-struct cgroup_subsys debug_cgrp_subsys = {
-	.css_alloc = debug_css_alloc,
-	.css_free = debug_css_free,
-	.legacy_cftypes = debug_files,
-};
-#endif /* CONFIG_CGROUP_DEBUG */
diff --git a/kernel/cgroup/debug.c b/kernel/cgroup/debug.c
new file mode 100644
index 0000000..1c209aa
--- /dev/null
+++ b/kernel/cgroup/debug.c
@@ -0,0 +1,153 @@
+#include <linux/ctype.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+
+#include "cgroup-internal.h"
+
+static struct cgroup_subsys_state *
+debug_css_alloc(struct cgroup_subsys_state *parent_css)
+{
+	struct cgroup_subsys_state *css = kzalloc(sizeof(*css), GFP_KERNEL);
+
+	if (!css)
+		return ERR_PTR(-ENOMEM);
+
+	return css;
+}
+
+static void debug_css_free(struct cgroup_subsys_state *css)
+{
+	kfree(css);
+}
+
+/*
+ * debug_taskcount_read - return the number of tasks in a cgroup.
+ * @cgrp: the cgroup in question
+ */
+static u64 debug_taskcount_read(struct cgroup_subsys_state *css,
+				struct cftype *cft)
+{
+	return cgroup_task_count(css->cgroup);
+}
+
+static u64 current_css_set_read(struct cgroup_subsys_state *css,
+				struct cftype *cft)
+{
+	return (u64)(unsigned long)current->cgroups;
+}
+
+static u64 current_css_set_refcount_read(struct cgroup_subsys_state *css,
+					 struct cftype *cft)
+{
+	u64 count;
+
+	rcu_read_lock();
+	count = refcount_read(&task_css_set(current)->refcount);
+	rcu_read_unlock();
+	return count;
+}
+
+static int current_css_set_cg_links_read(struct seq_file *seq, void *v)
+{
+	struct cgrp_cset_link *link;
+	struct css_set *cset;
+	char *name_buf;
+
+	name_buf = kmalloc(NAME_MAX + 1, GFP_KERNEL);
+	if (!name_buf)
+		return -ENOMEM;
+
+	spin_lock_irq(&css_set_lock);
+	rcu_read_lock();
+	cset = rcu_dereference(current->cgroups);
+	list_for_each_entry(link, &cset->cgrp_links, cgrp_link) {
+		struct cgroup *c = link->cgrp;
+
+		cgroup_name(c, name_buf, NAME_MAX + 1);
+		seq_printf(seq, "Root %d group %s\n",
+			   c->root->hierarchy_id, name_buf);
+	}
+	rcu_read_unlock();
+	spin_unlock_irq(&css_set_lock);
+	kfree(name_buf);
+	return 0;
+}
+
+#define MAX_TASKS_SHOWN_PER_CSS 25
+static int cgroup_css_links_read(struct seq_file *seq, void *v)
+{
+	struct cgroup_subsys_state *css = seq_css(seq);
+	struct cgrp_cset_link *link;
+
+	spin_lock_irq(&css_set_lock);
+	list_for_each_entry(link, &css->cgroup->cset_links, cset_link) {
+		struct css_set *cset = link->cset;
+		struct task_struct *task;
+		int count = 0;
+
+		seq_printf(seq, "css_set %pK\n", cset);
+
+		list_for_each_entry(task, &cset->tasks, cg_list) {
+			if (count++ > MAX_TASKS_SHOWN_PER_CSS)
+				goto overflow;
+			seq_printf(seq, "  task %d\n", task_pid_vnr(task));
+		}
+
+		list_for_each_entry(task, &cset->mg_tasks, cg_list) {
+			if (count++ > MAX_TASKS_SHOWN_PER_CSS)
+				goto overflow;
+			seq_printf(seq, "  task %d\n", task_pid_vnr(task));
+		}
+		continue;
+	overflow:
+		seq_puts(seq, "  ...\n");
+	}
+	spin_unlock_irq(&css_set_lock);
+	return 0;
+}
+
+static u64 releasable_read(struct cgroup_subsys_state *css, struct cftype *cft)
+{
+	return (!cgroup_is_populated(css->cgroup) &&
+		!css_has_online_children(&css->cgroup->self));
+}
+
+static struct cftype debug_files[] =  {
+	{
+		.name = "taskcount",
+		.read_u64 = debug_taskcount_read,
+	},
+
+	{
+		.name = "current_css_set",
+		.read_u64 = current_css_set_read,
+	},
+
+	{
+		.name = "current_css_set_refcount",
+		.read_u64 = current_css_set_refcount_read,
+	},
+
+	{
+		.name = "current_css_set_cg_links",
+		.seq_show = current_css_set_cg_links_read,
+	},
+
+	{
+		.name = "cgroup_css_links",
+		.seq_show = cgroup_css_links_read,
+	},
+
+	{
+		.name = "releasable",
+		.read_u64 = releasable_read,
+	},
+
+	{ }	/* terminate */
+};
+
+struct cgroup_subsys debug_cgrp_subsys = {
+	.css_alloc = debug_css_alloc,
+	.css_free = debug_css_free,
+	.legacy_cftypes = debug_files,
+};
-- 
1.8.3.1

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[PATCH-cgroup 0/5] cgroup: Make debug controller useful for debugging Waiman Long <longman@redhat.com> - 2017-06-13 23:20 +0200
  [PATCH-cgroup 3/5] cgroup: Make Kconfig prompt of debug cgroup more accurate Waiman Long <longman@redhat.com> - 2017-06-13 23:20 +0200
  [PATCH-cgroup 5/5] cgroup: Enable debug controller only with cgroup_debug boot option Waiman Long <longman@redhat.com> - 2017-06-13 23:20 +0200
  [PATCH-cgroup 1/5] cgroup: Keep accurate count of tasks in each css_set Waiman Long <longman@redhat.com> - 2017-06-13 23:20 +0200
  [PATCH-cgroup 4/5] cgroup: Make debug cgroup support v2 and thread mode Waiman Long <longman@redhat.com> - 2017-06-13 23:20 +0200
  [PATCH-cgroup 2/5] cgroup: Move debug cgroup to its own file Waiman Long <longman@redhat.com> - 2017-06-13 23:20 +0200

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