[PATCH V4 1/2] tracing, perf : add cpu hotplug trace events

[Vincent Guittot]

Please find below a new proposal for adding trace events for cpu hotplug.
The goal is to measure the latency of each part (kernel, architecture)
and also to trace the cpu hotplug activity with other power events. I
have tested these traces events on an arm platform.

Subject: [PATCH 1/2] cpu hotplug tracepoint

this patch adds new events for cpu hotplug tracing
 * plug/unplug sequence
 * core and architecture latency measurements

Signed-off-by: Vincent Guittot <vincent.guittot@xxxxxxxxxx>
---
 include/trace/events/cpu_hotplug.h |  103 ++++++++++++++++++++++++++++++++++++
 1 files changed, 103 insertions(+), 0 deletions(-)
 create mode 100644 include/trace/events/cpu_hotplug.h

diff --git a/include/trace/events/cpu_hotplug.h
b/include/trace/events/cpu_hotplug.h
new file mode 100644
index 0000000..af05775
--- /dev/null
+++ b/include/trace/events/cpu_hotplug.h
@@ -0,0 +1,103 @@
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM cpu_hotplug
+
+#if !defined(_TRACE_CPU_HOTPLUG_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_CPU_HOTPLUG_H
+
+#include <linux/tracepoint.h>
+
+DECLARE_EVENT_CLASS(cpu_hotplug,
+
+	TP_PROTO(unsigned int cpuid),
+
+	TP_ARGS(cpuid),
+
+	TP_STRUCT__entry(
+		__field(	unsigned int,	cpuid	)
+	),
+
+	TP_fast_assign(
+		__entry->cpuid = cpuid;
+	),
+
+	TP_printk("cpuid=%u", __entry->cpuid)
+);
+
+/* Core function of cpu hotplug */
+
+DEFINE_EVENT(cpu_hotplug, cpu_hotplug_down_start,
+
+	TP_PROTO(unsigned int cpuid),
+
+	TP_ARGS(cpuid)
+);
+
+DEFINE_EVENT(cpu_hotplug, cpu_hotplug_down_end,
+
+	TP_PROTO(unsigned int cpuid),
+
+	TP_ARGS(cpuid)
+);
+
+DEFINE_EVENT(cpu_hotplug, cpu_hotplug_up_start,
+
+	TP_PROTO(unsigned int cpuid),
+
+	TP_ARGS(cpuid)
+);
+
+DEFINE_EVENT(cpu_hotplug, cpu_hotplug_up_end,
+
+	TP_PROTO(unsigned int cpuid),
+
+	TP_ARGS(cpuid)
+);
+
+/* Architecture function for cpu hotplug */
+
+DEFINE_EVENT(cpu_hotplug, cpu_hotplug_disable_start,
+
+	TP_PROTO(unsigned int cpuid),
+
+	TP_ARGS(cpuid)
+);
+
+DEFINE_EVENT(cpu_hotplug, cpu_hotplug_disable_end,
+
+	TP_PROTO(unsigned int cpuid),
+
+	TP_ARGS(cpuid)
+);
+
+DEFINE_EVENT(cpu_hotplug, cpu_hotplug_die_start,
+
+	TP_PROTO(unsigned int cpuid),
+
+	TP_ARGS(cpuid)
+);
+
+DEFINE_EVENT(cpu_hotplug, cpu_hotplug_die_end,
+
+	TP_PROTO(unsigned int cpuid),
+
+	TP_ARGS(cpuid)
+);
+
+DEFINE_EVENT(cpu_hotplug, cpu_hotplug_arch_up_start,
+
+	TP_PROTO(unsigned int cpuid),
+
+	TP_ARGS(cpuid)
+);
+
+DEFINE_EVENT(cpu_hotplug, cpu_hotplug_arch_up_end,
+
+	TP_PROTO(unsigned int cpuid),
+
+	TP_ARGS(cpuid)
+);
+
+#endif /* _TRACE_CPU_HOTPLUG_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
-- 
1.7.1
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