cgroup: add tracepoints for basic operations

Debugging what goes wrong with cgroup setup can get hairy.  Add
tracepoints for cgroup hierarchy mount, cgroup creation/destruction
and task migration operations for better visibility.

Signed-off-by: Tejun Heo <tj@kernel.org>

1 files changed, 163 insertions, 0 deletions

diff --git a/include/trace/events/cgroup.h b/include/trace/events/cgroup.h
new file mode 100644
index 000000000000..ab68640a18d0
--- /dev/null
+++ b/include/trace/events/cgroup.h
@@ -0,0 +1,163 @@
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM cgroup
+
+#if !defined(_TRACE_CGROUP_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_CGROUP_H
+
+#include <linux/cgroup.h>
+#include <linux/tracepoint.h>
+
+DECLARE_EVENT_CLASS(cgroup_root,
+
+        TP_PROTO(struct cgroup_root *root),
+
+        TP_ARGS(root),
+
+        TP_STRUCT__entry(
+                __field(        int,            root                    )
+                __field(        u16,            ss_mask                 )
+                __string(       name,           root->name              )
+        ),
+
+        TP_fast_assign(
+                __entry->root = root->hierarchy_id;
+                __entry->ss_mask = root->subsys_mask;
+                __assign_str(name, root->name);
+        ),
+
+        TP_printk("root=%d ss_mask=%#x name=%s",
+                  __entry->root, __entry->ss_mask, __get_str(name))
+);
+
+DEFINE_EVENT(cgroup_root, cgroup_setup_root,
+
+        TP_PROTO(struct cgroup_root *root),
+
+        TP_ARGS(root)
+);
+
+DEFINE_EVENT(cgroup_root, cgroup_destroy_root,
+
+        TP_PROTO(struct cgroup_root *root),
+
+        TP_ARGS(root)
+);
+
+DEFINE_EVENT(cgroup_root, cgroup_remount,
+
+        TP_PROTO(struct cgroup_root *root),
+
+        TP_ARGS(root)
+);
+
+DECLARE_EVENT_CLASS(cgroup,
+
+        TP_PROTO(struct cgroup *cgrp),
+
+        TP_ARGS(cgrp),
+
+        TP_STRUCT__entry(
+                __field(        int,            root                    )
+                __field(        int,            id                      )
+                __field(        int,            level                   )
+                __dynamic_array(char,           path,
+                                cgrp->kn ? cgroup_path(cgrp, NULL, 0) + 1
+                                         : strlen("(null)"))
+        ),
+
+        TP_fast_assign(
+                __entry->root = cgrp->root->hierarchy_id;
+                __entry->id = cgrp->id;
+                __entry->level = cgrp->level;
+                if (cgrp->kn)
+                        cgroup_path(cgrp, __get_dynamic_array(path),
+                                    __get_dynamic_array_len(path));
+                else
+                        __assign_str(path, "(null)");
+        ),
+
+        TP_printk("root=%d id=%d level=%d path=%s",
+                  __entry->root, __entry->id, __entry->level, __get_str(path))
+);
+
+DEFINE_EVENT(cgroup, cgroup_mkdir,
+
+        TP_PROTO(struct cgroup *cgroup),
+
+        TP_ARGS(cgroup)
+);
+
+DEFINE_EVENT(cgroup, cgroup_rmdir,
+
+        TP_PROTO(struct cgroup *cgroup),
+
+        TP_ARGS(cgroup)
+);
+
+DEFINE_EVENT(cgroup, cgroup_release,
+
+        TP_PROTO(struct cgroup *cgroup),
+
+        TP_ARGS(cgroup)
+);
+
+DEFINE_EVENT(cgroup, cgroup_rename,
+
+        TP_PROTO(struct cgroup *cgroup),
+
+        TP_ARGS(cgroup)
+);
+
+DECLARE_EVENT_CLASS(cgroup_migrate,
+
+        TP_PROTO(struct cgroup *dst_cgrp, struct task_struct *task, bool threadgroup),
+
+        TP_ARGS(dst_cgrp, task, threadgroup),
+
+        TP_STRUCT__entry(
+                __field(        int,            dst_root                )
+                __field(        int,            dst_id                  )
+                __field(        int,            dst_level               )
+                __dynamic_array(char,           dst_path,
+                                dst_cgrp->kn ? cgroup_path(dst_cgrp, NULL, 0) + 1
+                                             : strlen("(null)"))
+                __field(        int,            pid                     )
+                __string(       comm,           task->comm              )
+        ),
+
+        TP_fast_assign(
+                __entry->dst_root = dst_cgrp->root->hierarchy_id;
+                __entry->dst_id = dst_cgrp->id;
+                __entry->dst_level = dst_cgrp->level;
+                if (dst_cgrp->kn)
+                        cgroup_path(dst_cgrp, __get_dynamic_array(dst_path),
+                                    __get_dynamic_array_len(dst_path));
+                else
+                        __assign_str(dst_path, "(null)");
+                __entry->pid = task->pid;
+                __assign_str(comm, task->comm);
+        ),
+
+        TP_printk("dst_root=%d dst_id=%d dst_level=%d dst_path=%s pid=%d comm=%s",
+                  __entry->dst_root, __entry->dst_id, __entry->dst_level,
+                  __get_str(dst_path), __entry->pid, __get_str(comm))
+);
+
+DEFINE_EVENT(cgroup_migrate, cgroup_attach_task,
+
+        TP_PROTO(struct cgroup *dst_cgrp, struct task_struct *task, bool threadgroup),
+
+        TP_ARGS(dst_cgrp, task, threadgroup)
+);
+
+DEFINE_EVENT(cgroup_migrate, cgroup_transfer_tasks,
+
+        TP_PROTO(struct cgroup *dst_cgrp, struct task_struct *task, bool threadgroup),
+
+        TP_ARGS(dst_cgrp, task, threadgroup)
+);
+
+#endif /* _TRACE_CGROUP_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>