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tracing/probe: Add trace_event_file access APIs for trace_probe

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Add trace_event_file access APIs for trace_probe data structure.
This simplifies enabling/disabling operations in uprobe and kprobe
events so that those don't touch deep inside the trace_probe.

This also removing a redundant synchronization when the
kprobe event is used from perf, since the perf itself uses
tracepoint_synchronize_unregister() after disabling (ftrace-
defined) event, thus we don't have to synchronize in that
path. Also we don't need to identify local trace_kprobe too
anymore.

Link: http://lkml.kernel.org/r/155931584587.28323.372301976283354629.stgit@devnote2

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Masami Hiramatsu
2019-06-01 00:17:26 +09:00
committed by Steven Rostedt (VMware)
parent 46e5376d40
commit b5f935ee13
4 changed files with 110 additions and 102 deletions
Download Patch File Download Diff File Expand all files Collapse all files
kernel/trace/trace_probe.h
+20 -16
View File
@@ -248,16 +248,32 @@ static inline bool trace_probe_is_registered(struct trace_probe *tp)
return !!(tp->flags & TP_FLAG_REGISTERED);
}
int trace_probe_init(struct trace_probe *tp, const char *event,
const char *group);
void trace_probe_cleanup(struct trace_probe *tp);
int trace_probe_register_event_call(struct trace_probe *tp);
static inline int trace_probe_unregister_event_call(struct trace_probe *tp)
{
/* tp->event is unregistered in trace_remove_event_call() */
return trace_remove_event_call(&tp->call);
}
static inline bool trace_probe_has_single_file(struct trace_probe *tp)
{
return !!list_is_singular(&tp->files);
}
int trace_probe_init(struct trace_probe *tp, const char *event,
const char *group);
void trace_probe_cleanup(struct trace_probe *tp);
int trace_probe_register_event_call(struct trace_probe *tp);
int trace_probe_add_file(struct trace_probe *tp, struct trace_event_file *file);
int trace_probe_remove_file(struct trace_probe *tp,
struct trace_event_file *file);
struct event_file_link *trace_probe_get_file_link(struct trace_probe *tp,
struct trace_event_file *file);
#define trace_probe_for_each_link(pos, tp) \
list_for_each_entry(pos, &(tp)->files, list)
#define trace_probe_for_each_link_rcu(pos, tp) \
list_for_each_entry_rcu(pos, &(tp)->files, list)
/* Check the name is good for event/group/fields */
static inline bool is_good_name(const char *name)
{
@@ -270,18 +286,6 @@ static inline bool is_good_name(const char *name)
return true;
}
static inline struct event_file_link *
find_event_file_link(struct trace_probe *tp, struct trace_event_file *file)
{
struct event_file_link *link;
list_for_each_entry(link, &tp->files, list)
if (link->file == file)
return link;
return NULL;
}
#define TPARG_FL_RETURN BIT(0)
#define TPARG_FL_KERNEL BIT(1)
#define TPARG_FL_FENTRY BIT(2)