mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-20 10:44:23 +08:00
af6af30c0f
Not all tracepoints are created equal, in specific the ftrace tracepoints are created with TRACE_EVENT_FORMAT() which does not generate the needed bits to tie them into perf counters. For those events, don't create the 'id' file and fail ->profile_enable when their ID is specified through other means. Reported-by: Chris Mason <chris.mason@oracle.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Steven Rostedt <rostedt@goodmis.org> LKML-Reference: <1249497664.5890.4.camel@laptop> [ v2: fix build error in the !CONFIG_EVENT_PROFILE case ] Signed-off-by: Ingo Molnar <mingo@elte.hu>
40 lines
755 B
C
40 lines
755 B
C
/*
|
|
* trace event based perf counter profiling
|
|
*
|
|
* Copyright (C) 2009 Red Hat Inc, Peter Zijlstra <pzijlstr@redhat.com>
|
|
*
|
|
*/
|
|
|
|
#include "trace.h"
|
|
|
|
int ftrace_profile_enable(int event_id)
|
|
{
|
|
struct ftrace_event_call *event;
|
|
int ret = -EINVAL;
|
|
|
|
mutex_lock(&event_mutex);
|
|
list_for_each_entry(event, &ftrace_events, list) {
|
|
if (event->id == event_id && event->profile_enable) {
|
|
ret = event->profile_enable(event);
|
|
break;
|
|
}
|
|
}
|
|
mutex_unlock(&event_mutex);
|
|
|
|
return ret;
|
|
}
|
|
|
|
void ftrace_profile_disable(int event_id)
|
|
{
|
|
struct ftrace_event_call *event;
|
|
|
|
mutex_lock(&event_mutex);
|
|
list_for_each_entry(event, &ftrace_events, list) {
|
|
if (event->id == event_id) {
|
|
event->profile_disable(event);
|
|
break;
|
|
}
|
|
}
|
|
mutex_unlock(&event_mutex);
|
|
}
|