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authorSteven Rostedt <srostedt@redhat.com>2009-01-21 16:24:46 -0500
committerIngo Molnar <mingo@elte.hu>2009-01-22 10:27:22 +0100
commit3244351c31211a8b1ba8b4b34c3de04d5dfa03e4 (patch)
treef5b485f3c7f8375002c93dabaf577b14d5a2d2eb /kernel/trace/trace_sched_wakeup.c
parent97b17efe4537e11bf6669106cfe4ee2c5331b267 (diff)
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trace: separate out rt tasks from wakeup tracer
Impact: add option to trace all tasks or just RT tasks The current wakeup tracer only traces RT task wakeups. This is fine for those interested in wake up timings of RT tasks, but it is useless for those that are interested in the causes of long wakeups for non RT tasks. This patch creates a "wakeup_rt" to implement the tracing of just RT tasks (as the current "wakeup" does). And makes "wakeup" now trace all tasks as an average developer would expect. Signed-off-by: Steven Rostedt <srostedt@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/trace/trace_sched_wakeup.c')
-rw-r--r--kernel/trace/trace_sched_wakeup.c34
1 files changed, 32 insertions, 2 deletions
diff --git a/kernel/trace/trace_sched_wakeup.c b/kernel/trace/trace_sched_wakeup.c
index e27adef0171..f4895788610 100644
--- a/kernel/trace/trace_sched_wakeup.c
+++ b/kernel/trace/trace_sched_wakeup.c
@@ -25,6 +25,7 @@ static int __read_mostly tracer_enabled;
static struct task_struct *wakeup_task;
static int wakeup_cpu;
static unsigned wakeup_prio = -1;
+static int wakeup_rt;
static raw_spinlock_t wakeup_lock =
(raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED;
@@ -224,7 +225,7 @@ probe_wakeup(struct rq *rq, struct task_struct *p, int success)
tracing_record_cmdline(p);
tracing_record_cmdline(current);
- if (likely(!rt_task(p)) ||
+ if ((wakeup_rt && !rt_task(p)) ||
p->prio >= wakeup_prio ||
p->prio >= current->prio)
return;
@@ -321,7 +322,7 @@ static void stop_wakeup_tracer(struct trace_array *tr)
unregister_trace_sched_wakeup(probe_wakeup);
}
-static int wakeup_tracer_init(struct trace_array *tr)
+static int __wakeup_tracer_init(struct trace_array *tr)
{
tracing_max_latency = 0;
wakeup_trace = tr;
@@ -329,6 +330,18 @@ static int wakeup_tracer_init(struct trace_array *tr)
return 0;
}
+static int wakeup_tracer_init(struct trace_array *tr)
+{
+ wakeup_rt = 0;
+ return __wakeup_tracer_init(tr);
+}
+
+static int wakeup_rt_tracer_init(struct trace_array *tr)
+{
+ wakeup_rt = 1;
+ return __wakeup_tracer_init(tr);
+}
+
static void wakeup_tracer_reset(struct trace_array *tr)
{
stop_wakeup_tracer(tr);
@@ -360,6 +373,19 @@ static struct tracer wakeup_tracer __read_mostly =
#endif
};
+static struct tracer wakeup_rt_tracer __read_mostly =
+{
+ .name = "wakeup_rt",
+ .init = wakeup_rt_tracer_init,
+ .reset = wakeup_tracer_reset,
+ .start = wakeup_tracer_start,
+ .stop = wakeup_tracer_stop,
+ .print_max = 1,
+#ifdef CONFIG_FTRACE_SELFTEST
+ .selftest = trace_selftest_startup_wakeup,
+#endif
+};
+
__init static int init_wakeup_tracer(void)
{
int ret;
@@ -368,6 +394,10 @@ __init static int init_wakeup_tracer(void)
if (ret)
return ret;
+ ret = register_tracer(&wakeup_rt_tracer);
+ if (ret)
+ return ret;
+
return 0;
}
device_initcall(init_wakeup_tracer);