ftrace: add wakeup events to sched tracer

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 36 insertions, 0 deletions

diff --git a/kernel/trace/trace_sched_switch.c b/kernel/trace/trace_sched_switch.c
index b738eaca1dbe..8b1cf1a3aee0 100644
--- a/kernel/trace/trace_sched_switch.c
+++ b/kernel/trace/trace_sched_switch.c
@@ -41,6 +41,29 @@ ctx_switch_func(struct task_struct *prev, struct task_struct *next)
         local_irq_restore(flags);
 }
 
+static void wakeup_func(struct task_struct *wakee, struct task_struct *curr)
+{
+        struct trace_array *tr = ctx_trace;
+        struct trace_array_cpu *data;
+        unsigned long flags;
+        long disabled;
+        int cpu;
+
+        if (!tracer_enabled)
+                return;
+
+        local_irq_save(flags);
+        cpu = raw_smp_processor_id();
+        data = tr->data[cpu];
+        disabled = atomic_inc_return(&data->disabled);
+
+        if (likely(disabled == 1))
+                tracing_sched_wakeup_trace(tr, data, wakee, curr, flags);
+
+        atomic_dec(&data->disabled);
+        local_irq_restore(flags);
+}
+
 void ftrace_ctx_switch(struct task_struct *prev, struct task_struct *next)
 {
         tracing_record_cmdline(prev);
@@ -57,6 +80,19 @@ void ftrace_ctx_switch(struct task_struct *prev, struct task_struct *next)
         wakeup_sched_switch(prev, next);
 }
 
+void
+ftrace_wake_up_task(struct task_struct *wakee, struct task_struct *curr)
+{
+        tracing_record_cmdline(curr);
+
+        wakeup_func(wakee, curr);
+
+        /*
+         * Chain to the wakeup tracer (this is a NOP if disabled):
+         */
+        wakeup_sched_wakeup(wakee, curr);
+}
+
 static void sched_switch_reset(struct trace_array *tr)
 {
         int cpu;