提交 65daaca7 编写于 作者: S Steven Rostedt (Red Hat) 提交者: Steven Rostedt

tracing: Allow wakeup tracers to be used by instances

The wakeup and wakeup_rt tracers can now be used by instances.
But they may only be used by one instance at a time (including the
top level directory). This allows multiple tracers to run while
the wakeup tracer is running simultaneously.
Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
上级 0b9b12c1
......@@ -601,6 +601,8 @@ static void stop_wakeup_tracer(struct trace_array *tr)
unregister_trace_sched_migrate_task(probe_wakeup_migrate_task, NULL);
}
static bool wakeup_busy;
static int __wakeup_tracer_init(struct trace_array *tr)
{
save_flags = trace_flags;
......@@ -613,11 +615,16 @@ static int __wakeup_tracer_init(struct trace_array *tr)
wakeup_trace = tr;
ftrace_init_array_ops(tr, wakeup_tracer_call);
start_wakeup_tracer(tr);
wakeup_busy = true;
return 0;
}
static int wakeup_tracer_init(struct trace_array *tr)
{
if (wakeup_busy)
return -EBUSY;
wakeup_dl = 0;
wakeup_rt = 0;
return __wakeup_tracer_init(tr);
......@@ -625,6 +632,9 @@ static int wakeup_tracer_init(struct trace_array *tr)
static int wakeup_rt_tracer_init(struct trace_array *tr)
{
if (wakeup_busy)
return -EBUSY;
wakeup_dl = 0;
wakeup_rt = 1;
return __wakeup_tracer_init(tr);
......@@ -632,6 +642,9 @@ static int wakeup_rt_tracer_init(struct trace_array *tr)
static int wakeup_dl_tracer_init(struct trace_array *tr)
{
if (wakeup_busy)
return -EBUSY;
wakeup_dl = 1;
wakeup_rt = 0;
return __wakeup_tracer_init(tr);
......@@ -649,6 +662,7 @@ static void wakeup_tracer_reset(struct trace_array *tr)
set_tracer_flag(tr, TRACE_ITER_LATENCY_FMT, lat_flag);
set_tracer_flag(tr, TRACE_ITER_OVERWRITE, overwrite_flag);
ftrace_reset_array_ops(tr);
wakeup_busy = false;
}
static void wakeup_tracer_start(struct trace_array *tr)
......@@ -680,6 +694,7 @@ static struct tracer wakeup_tracer __read_mostly =
#endif
.open = wakeup_trace_open,
.close = wakeup_trace_close,
.allow_instances = true,
.use_max_tr = true,
};
......@@ -702,6 +717,7 @@ static struct tracer wakeup_rt_tracer __read_mostly =
#endif
.open = wakeup_trace_open,
.close = wakeup_trace_close,
.allow_instances = true,
.use_max_tr = true,
};
......
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