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tracing: trace_stat.c cleanup

Browse source 
Impact: cleanup

- whitespace / code alignment cleanups
- avoid unnecessary forward prototype by reordering functions

Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar 2009-01-15 11:31:21 +01:00
parent 42fab4b2cd
commit 55922173f1
1 changed files with 71 additions and 76 deletions
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147
kernel/trace/trace_stat.c
View file

@ -17,16 +17,16 @@
/* List of stat entries from a tracer */ /* List of stat entries from a tracer */
struct trace_stat_list { struct trace_stat_list {
struct list_head list; struct list_head list;
void *stat; void *stat;
}; };
/* A stat session is the stats output in one file */ /* A stat session is the stats output in one file */
struct tracer_stat_session { struct tracer_stat_session {
struct list_head session_list; struct list_head session_list;
struct tracer_stat *ts; struct tracer_stat *ts;
struct list_head stat_list; struct list_head stat_list;
struct mutex stat_mutex; struct mutex stat_mutex;
struct dentry *file; struct dentry *file;
}; };
@ -35,7 +35,7 @@ static LIST_HEAD(all_stat_sessions);
static DEFINE_MUTEX(all_stat_sessions_mutex); static DEFINE_MUTEX(all_stat_sessions_mutex);
/* The root directory for all stat files */ /* 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) 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); 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. * For tracers that don't provide a stat_cmp callback.
* This one will force an immediate insertion on tail of * 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 = { static const struct seq_operations trace_stat_seq_ops = {
.start = stat_seq_start, .start = stat_seq_start,
.next = stat_seq_next, .next = stat_seq_next,
.stop = stat_seq_stop, .stop = stat_seq_stop,
.show = stat_seq_show .show = stat_seq_show
}; };
/* The session stat is refilled and resorted at each stat file opening */ /* 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; return ret;
} }
/* /*
* Avoid consuming memory with our now useless list. * 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 -ENOMEM;
return 0; 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);
}