Commit | Line | Data |
---|---|---|
ac199db0 PZ |
1 | /* |
2 | * trace event based perf counter profiling | |
3 | * | |
4 | * Copyright (C) 2009 Red Hat Inc, Peter Zijlstra <pzijlstr@redhat.com> | |
5 | * | |
6 | */ | |
7 | ||
558e6547 | 8 | #include <linux/module.h> |
ac199db0 PZ |
9 | #include "trace.h" |
10 | ||
e5e25cf4 FW |
11 | static int ftrace_profile_enable_event(struct ftrace_event_call *event) |
12 | { | |
13 | if (atomic_inc_return(&event->profile_count)) | |
14 | return 0; | |
15 | ||
16 | return event->profile_enable(); | |
17 | } | |
18 | ||
ac199db0 PZ |
19 | int ftrace_profile_enable(int event_id) |
20 | { | |
21 | struct ftrace_event_call *event; | |
20c8928a | 22 | int ret = -EINVAL; |
ac199db0 | 23 | |
20c8928a | 24 | mutex_lock(&event_mutex); |
a59fd602 | 25 | list_for_each_entry(event, &ftrace_events, list) { |
558e6547 LZ |
26 | if (event->id == event_id && event->profile_enable && |
27 | try_module_get(event->mod)) { | |
e5e25cf4 | 28 | ret = ftrace_profile_enable_event(event); |
20c8928a LZ |
29 | break; |
30 | } | |
ac199db0 | 31 | } |
20c8928a | 32 | mutex_unlock(&event_mutex); |
ac199db0 | 33 | |
20c8928a | 34 | return ret; |
ac199db0 PZ |
35 | } |
36 | ||
e5e25cf4 FW |
37 | static void ftrace_profile_disable_event(struct ftrace_event_call *event) |
38 | { | |
39 | if (!atomic_add_negative(-1, &event->profile_count)) | |
40 | return; | |
41 | ||
42 | event->profile_disable(); | |
43 | } | |
44 | ||
ac199db0 PZ |
45 | void ftrace_profile_disable(int event_id) |
46 | { | |
47 | struct ftrace_event_call *event; | |
48 | ||
20c8928a | 49 | mutex_lock(&event_mutex); |
a59fd602 | 50 | list_for_each_entry(event, &ftrace_events, list) { |
20c8928a | 51 | if (event->id == event_id) { |
e5e25cf4 | 52 | ftrace_profile_disable_event(event); |
558e6547 | 53 | module_put(event->mod); |
20c8928a LZ |
54 | break; |
55 | } | |
ac199db0 | 56 | } |
20c8928a | 57 | mutex_unlock(&event_mutex); |
ac199db0 | 58 | } |