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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>
This commit is contained in:
Tejun Heo
parent
4c737b41de
commit
ed1777de25
163
include/trace/events/cgroup.h
Normal file
163
include/trace/events/cgroup.h
Normal file
@ -0,0 +1,163 @@
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#undef TRACE_SYSTEM
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#define TRACE_SYSTEM cgroup
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#if !defined(_TRACE_CGROUP_H) || defined(TRACE_HEADER_MULTI_READ)
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#define _TRACE_CGROUP_H
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#include <linux/cgroup.h>
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#include <linux/tracepoint.h>
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DECLARE_EVENT_CLASS(cgroup_root,
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TP_PROTO(struct cgroup_root *root),
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TP_ARGS(root),
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TP_STRUCT__entry(
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__field( int, root )
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__field( u16, ss_mask )
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__string( name, root->name )
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),
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TP_fast_assign(
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__entry->root = root->hierarchy_id;
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__entry->ss_mask = root->subsys_mask;
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__assign_str(name, root->name);
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),
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TP_printk("root=%d ss_mask=%#x name=%s",
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__entry->root, __entry->ss_mask, __get_str(name))
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);
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DEFINE_EVENT(cgroup_root, cgroup_setup_root,
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TP_PROTO(struct cgroup_root *root),
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TP_ARGS(root)
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);
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DEFINE_EVENT(cgroup_root, cgroup_destroy_root,
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TP_PROTO(struct cgroup_root *root),
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TP_ARGS(root)
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);
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DEFINE_EVENT(cgroup_root, cgroup_remount,
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TP_PROTO(struct cgroup_root *root),
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TP_ARGS(root)
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);
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DECLARE_EVENT_CLASS(cgroup,
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TP_PROTO(struct cgroup *cgrp),
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TP_ARGS(cgrp),
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TP_STRUCT__entry(
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__field( int, root )
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__field( int, id )
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__field( int, level )
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__dynamic_array(char, path,
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cgrp->kn ? cgroup_path(cgrp, NULL, 0) + 1
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: strlen("(null)"))
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),
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TP_fast_assign(
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__entry->root = cgrp->root->hierarchy_id;
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__entry->id = cgrp->id;
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__entry->level = cgrp->level;
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if (cgrp->kn)
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cgroup_path(cgrp, __get_dynamic_array(path),
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__get_dynamic_array_len(path));
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else
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__assign_str(path, "(null)");
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),
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TP_printk("root=%d id=%d level=%d path=%s",
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__entry->root, __entry->id, __entry->level, __get_str(path))
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);
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DEFINE_EVENT(cgroup, cgroup_mkdir,
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TP_PROTO(struct cgroup *cgroup),
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TP_ARGS(cgroup)
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);
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DEFINE_EVENT(cgroup, cgroup_rmdir,
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TP_PROTO(struct cgroup *cgroup),
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TP_ARGS(cgroup)
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);
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DEFINE_EVENT(cgroup, cgroup_release,
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TP_PROTO(struct cgroup *cgroup),
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TP_ARGS(cgroup)
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);
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DEFINE_EVENT(cgroup, cgroup_rename,
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TP_PROTO(struct cgroup *cgroup),
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TP_ARGS(cgroup)
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);
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DECLARE_EVENT_CLASS(cgroup_migrate,
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TP_PROTO(struct cgroup *dst_cgrp, struct task_struct *task, bool threadgroup),
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TP_ARGS(dst_cgrp, task, threadgroup),
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TP_STRUCT__entry(
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__field( int, dst_root )
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__field( int, dst_id )
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__field( int, dst_level )
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__dynamic_array(char, dst_path,
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dst_cgrp->kn ? cgroup_path(dst_cgrp, NULL, 0) + 1
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: strlen("(null)"))
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__field( int, pid )
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__string( comm, task->comm )
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),
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TP_fast_assign(
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__entry->dst_root = dst_cgrp->root->hierarchy_id;
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__entry->dst_id = dst_cgrp->id;
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__entry->dst_level = dst_cgrp->level;
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if (dst_cgrp->kn)
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cgroup_path(dst_cgrp, __get_dynamic_array(dst_path),
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__get_dynamic_array_len(dst_path));
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else
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__assign_str(dst_path, "(null)");
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__entry->pid = task->pid;
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__assign_str(comm, task->comm);
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),
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TP_printk("dst_root=%d dst_id=%d dst_level=%d dst_path=%s pid=%d comm=%s",
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__entry->dst_root, __entry->dst_id, __entry->dst_level,
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__get_str(dst_path), __entry->pid, __get_str(comm))
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);
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DEFINE_EVENT(cgroup_migrate, cgroup_attach_task,
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TP_PROTO(struct cgroup *dst_cgrp, struct task_struct *task, bool threadgroup),
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TP_ARGS(dst_cgrp, task, threadgroup)
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);
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DEFINE_EVENT(cgroup_migrate, cgroup_transfer_tasks,
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TP_PROTO(struct cgroup *dst_cgrp, struct task_struct *task, bool threadgroup),
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TP_ARGS(dst_cgrp, task, threadgroup)
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);
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#endif /* _TRACE_CGROUP_H */
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/* This part must be outside protection */
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#include <trace/define_trace.h>
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@ -64,6 +64,9 @@
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#include <linux/file.h>
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#include <net/sock.h>
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#define CREATE_TRACE_POINTS
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#include <trace/events/cgroup.h>
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/*
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* pidlists linger the following amount before being destroyed. The goal
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* is avoiding frequent destruction in the middle of consecutive read calls
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@ -1176,6 +1179,8 @@ static void cgroup_destroy_root(struct cgroup_root *root)
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struct cgroup *cgrp = &root->cgrp;
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struct cgrp_cset_link *link, *tmp_link;
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trace_cgroup_destroy_root(root);
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cgroup_lock_and_drain_offline(&cgrp_dfl_root.cgrp);
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BUG_ON(atomic_read(&root->nr_cgrps));
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@ -1874,6 +1879,9 @@ static int cgroup_remount(struct kernfs_root *kf_root, int *flags, char *data)
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strcpy(root->release_agent_path, opts.release_agent);
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spin_unlock(&release_agent_path_lock);
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}
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trace_cgroup_remount(root);
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out_unlock:
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kfree(opts.release_agent);
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kfree(opts.name);
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@ -2031,6 +2039,8 @@ static int cgroup_setup_root(struct cgroup_root *root, u16 ss_mask)
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if (ret)
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goto destroy_root;
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trace_cgroup_setup_root(root);
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/*
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* There must be no failure case after here, since rebinding takes
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* care of subsystems' refcounts, which are explicitly dropped in
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@ -2825,6 +2835,10 @@ static int cgroup_attach_task(struct cgroup *dst_cgrp,
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ret = cgroup_migrate(leader, threadgroup, dst_cgrp->root);
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cgroup_migrate_finish(&preloaded_csets);
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if (!ret)
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trace_cgroup_attach_task(dst_cgrp, leader, threadgroup);
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return ret;
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}
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@ -3587,6 +3601,8 @@ static int cgroup_rename(struct kernfs_node *kn, struct kernfs_node *new_parent,
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mutex_lock(&cgroup_mutex);
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ret = kernfs_rename(kn, new_parent, new_name_str);
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if (!ret)
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trace_cgroup_rename(cgrp);
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mutex_unlock(&cgroup_mutex);
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@ -4355,6 +4371,8 @@ int cgroup_transfer_tasks(struct cgroup *to, struct cgroup *from)
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if (task) {
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ret = cgroup_migrate(task, false, to->root);
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if (!ret)
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trace_cgroup_transfer_tasks(to, task, false);
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put_task_struct(task);
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}
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} while (task && !ret);
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@ -5020,6 +5038,8 @@ static void css_release_work_fn(struct work_struct *work)
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ss->css_released(css);
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} else {
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/* cgroup release path */
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trace_cgroup_release(cgrp);
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cgroup_idr_remove(&cgrp->root->cgroup_idr, cgrp->id);
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cgrp->id = -1;
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@ -5306,6 +5326,8 @@ static int cgroup_mkdir(struct kernfs_node *parent_kn, const char *name,
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if (ret)
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goto out_destroy;
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trace_cgroup_mkdir(cgrp);
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/* let's create and online css's */
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kernfs_activate(kn);
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@ -5481,6 +5503,9 @@ static int cgroup_rmdir(struct kernfs_node *kn)
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ret = cgroup_destroy_locked(cgrp);
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if (!ret)
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trace_cgroup_rmdir(cgrp);
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cgroup_kn_unlock(kn);
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return ret;
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}
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