[PATCH 02/70] cpufreq interactive governor: event tracing

["Bálint Czobor" <czoborbalint@gmail.com>]

From: Todd Poynor <toddpoynor@google.com>

Change-Id: Ic13614a3da2faa2d4bd215ca3eb7191614f0cf66
Signed-off-by: Todd Poynor <toddpoynor@google.com>
Signed-off-by: Bálint Czobor <czoborbalint@gmail.com>
---
 drivers/cpufreq/cpufreq_interactive.c      |   19 +++++-
 include/trace/events/cpufreq_interactive.h |   87 ++++++++++++++++++++++++++++
 2 files changed, 105 insertions(+), 1 deletion(-)
 create mode 100644 include/trace/events/cpufreq_interactive.h

diff --git a/drivers/cpufreq/cpufreq_interactive.c b/drivers/cpufreq/cpufreq_interactive.c
index 8fc147c..62e7456 100644
--- a/drivers/cpufreq/cpufreq_interactive.c
+++ b/drivers/cpufreq/cpufreq_interactive.c
@@ -30,6 +30,9 @@
 #include <linux/kthread.h>
 #include <linux/mutex.h>
 
+#define CREATE_TRACE_POINTS
+#include <trace/events/cpufreq_interactive.h>
+
 #include <asm/cputime.h>
 
 static atomic_t active_count = ATOMIC_INIT(0);
@@ -182,7 +185,11 @@ static void cpufreq_interactive_timer(unsigned long data)
 	new_freq = pcpu->freq_table[index].frequency;
 
 	if (pcpu->target_freq == new_freq)
+	{
+		trace_cpufreq_interactive_already(data, cpu_load,
+						  pcpu->target_freq, new_freq);
 		goto rearm_if_notmax;
+	}
 
 	/*
 	 * Do not scale down unless we have been at this frequency for the
@@ -190,10 +197,16 @@ static void cpufreq_interactive_timer(unsigned long data)
 	 */
 	if (new_freq < pcpu->target_freq) {
 		if (pcpu->timer_run_time - pcpu->freq_change_time
-		    < min_sample_time)
+		    < min_sample_time) {
+			trace_cpufreq_interactive_notyet(data, cpu_load,
+					 pcpu->target_freq, new_freq);
 			goto rearm;
+		}
 	}
 
+	trace_cpufreq_interactive_target(data, cpu_load, pcpu->target_freq,
+					 new_freq);
+
 	if (new_freq < pcpu->target_freq) {
 		pcpu->target_freq = new_freq;
 		spin_lock_irqsave(&down_cpumask_lock, flags);
@@ -381,6 +394,8 @@ static int cpufreq_interactive_up_task(void *data)
 			pcpu->freq_change_time_in_idle =
 				get_cpu_idle_time_us(cpu,
 						     &pcpu->freq_change_time);
+			trace_cpufreq_interactive_up(cpu, pcpu->target_freq,
+						     pcpu->policy->cur);
 		}
 	}
 
@@ -427,6 +442,8 @@ static void cpufreq_interactive_freq_down(struct work_struct *work)
 		pcpu->freq_change_time_in_idle =
 			get_cpu_idle_time_us(cpu,
 					     &pcpu->freq_change_time);
+		trace_cpufreq_interactive_down(cpu, pcpu->target_freq,
+					       pcpu->policy->cur);
 	}
 }
 
diff --git a/include/trace/events/cpufreq_interactive.h b/include/trace/events/cpufreq_interactive.h
new file mode 100644
index 0000000..3a90d3d
--- /dev/null
+++ b/include/trace/events/cpufreq_interactive.h
@@ -0,0 +1,87 @@
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM cpufreq_interactive
+
+#if !defined(_TRACE_CPUFREQ_INTERACTIVE_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_CPUFREQ_INTERACTIVE_H
+
+#include <linux/tracepoint.h>
+
+DECLARE_EVENT_CLASS(set,
+	TP_PROTO(u32 cpu_id, unsigned long targfreq,
+	         unsigned long actualfreq),
+	TP_ARGS(cpu_id, targfreq, actualfreq),
+
+	TP_STRUCT__entry(
+	    __field(          u32, cpu_id    )
+	    __field(unsigned long, targfreq   )
+	    __field(unsigned long, actualfreq )
+	   ),
+
+	TP_fast_assign(
+	    __entry->cpu_id = (u32) cpu_id;
+	    __entry->targfreq = targfreq;
+	    __entry->actualfreq = actualfreq;
+	),
+
+	TP_printk("cpu=%u targ=%lu actual=%lu",
+	      __entry->cpu_id, __entry->targfreq,
+	      __entry->actualfreq)
+);
+
+DEFINE_EVENT(set, cpufreq_interactive_up,
+	TP_PROTO(u32 cpu_id, unsigned long targfreq,
+	     unsigned long actualfreq),
+	TP_ARGS(cpu_id, targfreq, actualfreq)
+);
+
+DEFINE_EVENT(set, cpufreq_interactive_down,
+	TP_PROTO(u32 cpu_id, unsigned long targfreq,
+	     unsigned long actualfreq),
+	TP_ARGS(cpu_id, targfreq, actualfreq)
+);
+
+DECLARE_EVENT_CLASS(loadeval,
+	    TP_PROTO(unsigned long cpu_id, unsigned long load,
+		     unsigned long curfreq, unsigned long targfreq),
+	    TP_ARGS(cpu_id, load, curfreq, targfreq),
+
+	    TP_STRUCT__entry(
+		    __field(unsigned long, cpu_id    )
+		    __field(unsigned long, load      )
+		    __field(unsigned long, curfreq   )
+		    __field(unsigned long, targfreq  )
+	    ),
+
+	    TP_fast_assign(
+		    __entry->cpu_id = cpu_id;
+		    __entry->load = load;
+		    __entry->curfreq = curfreq;
+		    __entry->targfreq = targfreq;
+	    ),
+
+	    TP_printk("cpu=%lu load=%lu cur=%lu targ=%lu",
+		      __entry->cpu_id, __entry->load, __entry->curfreq,
+		      __entry->targfreq)
+);
+
+DEFINE_EVENT(loadeval, cpufreq_interactive_target,
+	    TP_PROTO(unsigned long cpu_id, unsigned long load,
+		     unsigned long curfreq, unsigned long targfreq),
+	    TP_ARGS(cpu_id, load, curfreq, targfreq)
+);
+
+DEFINE_EVENT(loadeval, cpufreq_interactive_already,
+	    TP_PROTO(unsigned long cpu_id, unsigned long load,
+		     unsigned long curfreq, unsigned long targfreq),
+	    TP_ARGS(cpu_id, load, curfreq, targfreq)
+);
+
+DEFINE_EVENT(loadeval, cpufreq_interactive_notyet,
+	    TP_PROTO(unsigned long cpu_id, unsigned long load,
+		     unsigned long curfreq, unsigned long targfreq),
+	    TP_ARGS(cpu_id, load, curfreq, targfreq)
+);
+#endif /* _TRACE_CPUFREQ_INTERACTIVE_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
-- 
1.7.9.5