diff options
| -rw-r--r-- | kernel/trace/trace_stat.c | 147 |
1 files changed, 71 insertions, 76 deletions
diff --git a/kernel/trace/trace_stat.c b/kernel/trace/trace_stat.c index 2110cea2ece3..eae9cef39291 100644 --- a/kernel/trace/trace_stat.c +++ b/kernel/trace/trace_stat.c @@ -17,16 +17,16 @@ /* List of stat entries from a tracer */ struct trace_stat_list { - struct list_head list; - void *stat; + struct list_head list; + void *stat; }; /* A stat session is the stats output in one file */ struct tracer_stat_session { struct list_head session_list; - struct tracer_stat *ts; - struct list_head stat_list; - struct mutex stat_mutex; + struct tracer_stat *ts; + struct list_head stat_list; + struct mutex stat_mutex; struct dentry *file; }; @@ -35,7 +35,7 @@ static LIST_HEAD(all_stat_sessions); static DEFINE_MUTEX(all_stat_sessions_mutex); /* The root directory for all stat files */ -static struct dentry *stat_dir; +static struct dentry *stat_dir; static void reset_stat_session(struct tracer_stat_session *session) @@ -56,71 +56,6 @@ static void destroy_session(struct tracer_stat_session *session) kfree(session); } - -static int init_stat_file(struct tracer_stat_session *session); - -int register_stat_tracer(struct tracer_stat *trace) -{ - struct tracer_stat_session *session, *node, *tmp; - int ret; - - if (!trace) - return -EINVAL; - - if (!trace->stat_start || !trace->stat_next || !trace->stat_show) - return -EINVAL; - - /* Already registered? */ - mutex_lock(&all_stat_sessions_mutex); - list_for_each_entry_safe(node, tmp, &all_stat_sessions, session_list) { - if (node->ts == trace) { - mutex_unlock(&all_stat_sessions_mutex); - return -EINVAL; - } - } - mutex_unlock(&all_stat_sessions_mutex); - - /* Init the session */ - session = kmalloc(sizeof(struct tracer_stat_session), GFP_KERNEL); - if (!session) - return -ENOMEM; - - session->ts = trace; - INIT_LIST_HEAD(&session->session_list); - INIT_LIST_HEAD(&session->stat_list); - mutex_init(&session->stat_mutex); - session->file = NULL; - - ret = init_stat_file(session); - if (ret) { - destroy_session(session); - return ret; - } - - /* Register */ - mutex_lock(&all_stat_sessions_mutex); - list_add_tail(&session->session_list, &all_stat_sessions); - mutex_unlock(&all_stat_sessions_mutex); - - return 0; -} - -void unregister_stat_tracer(struct tracer_stat *trace) -{ - struct tracer_stat_session *node, *tmp; - - mutex_lock(&all_stat_sessions_mutex); - list_for_each_entry_safe(node, tmp, &all_stat_sessions, session_list) { - if (node->ts == trace) { - list_del(&node->session_list); - destroy_session(node); - break; - } - } - mutex_unlock(&all_stat_sessions_mutex); -} - - /* * For tracers that don't provide a stat_cmp callback. * This one will force an immediate insertion on tail of @@ -252,10 +187,10 @@ static int stat_seq_show(struct seq_file *s, void *v) } static const struct seq_operations trace_stat_seq_ops = { - .start = stat_seq_start, - .next = stat_seq_next, - .stop = stat_seq_stop, - .show = stat_seq_show + .start = stat_seq_start, + .next = stat_seq_next, + .stop = stat_seq_stop, + .show = stat_seq_show }; /* The session stat is refilled and resorted at each stat file opening */ @@ -275,7 +210,6 @@ static int tracing_stat_open(struct inode *inode, struct file *file) return ret; } - /* * Avoid consuming memory with our now useless list. */ @@ -322,3 +256,64 @@ static int init_stat_file(struct tracer_stat_session *session) return -ENOMEM; return 0; } + +int register_stat_tracer(struct tracer_stat *trace) +{ + struct tracer_stat_session *session, *node, *tmp; + int ret; + + if (!trace) + return -EINVAL; + + if (!trace->stat_start || !trace->stat_next || !trace->stat_show) + return -EINVAL; + + /* Already registered? */ + mutex_lock(&all_stat_sessions_mutex); + list_for_each_entry_safe(node, tmp, &all_stat_sessions, session_list) { + if (node->ts == trace) { + mutex_unlock(&all_stat_sessions_mutex); + return -EINVAL; + } + } + mutex_unlock(&all_stat_sessions_mutex); + + /* Init the session */ + session = kmalloc(sizeof(struct tracer_stat_session), GFP_KERNEL); + if (!session) + return -ENOMEM; + + session->ts = trace; + INIT_LIST_HEAD(&session->session_list); + INIT_LIST_HEAD(&session->stat_list); + mutex_init(&session->stat_mutex); + session->file = NULL; + + ret = init_stat_file(session); + if (ret) { + destroy_session(session); + return ret; + } + + /* Register */ + mutex_lock(&all_stat_sessions_mutex); + list_add_tail(&session->session_list, &all_stat_sessions); + mutex_unlock(&all_stat_sessions_mutex); + + return 0; +} + +void unregister_stat_tracer(struct tracer_stat *trace) +{ + struct tracer_stat_session *node, *tmp; + + mutex_lock(&all_stat_sessions_mutex); + list_for_each_entry_safe(node, tmp, &all_stat_sessions, session_list) { + if (node->ts == trace) { + list_del(&node->session_list); + destroy_session(node); + break; + } + } + mutex_unlock(&all_stat_sessions_mutex); +} |
