cpufreq: powernv/tracing: Add powernv_throttle tracepoint

This patch adds the powernv_throttle tracepoint to trace the CPU
frequency throttling event, which is used by the powernv-cpufreq
driver in POWER8.

Signed-off-by: Shilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com>
Reviewed-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/include/trace/events/power.h b/include/trace/events/power.h
index 284244ebfe8d2c3ef7036c3a7e9b55ea15b11078..19e50300ce7d63da516ef9ea365c156a4e77ad3c 100644 (file)
--- a/include/trace/events/power.h
+++ b/include/trace/events/power.h
@@ -38,6 +38,28 @@ DEFINE_EVENT(cpu, cpu_idle,
        TP_ARGS(state, cpu_id)
 );
 
+TRACE_EVENT(powernv_throttle,
+
+       TP_PROTO(int chip_id, const char *reason, int pmax),
+
+       TP_ARGS(chip_id, reason, pmax),
+
+       TP_STRUCT__entry(
+               __field(int, chip_id)
+               __string(reason, reason)
+               __field(int, pmax)
+       ),
+
+       TP_fast_assign(
+               __entry->chip_id = chip_id;
+               __assign_str(reason, reason);
+               __entry->pmax = pmax;
+       ),
+
+       TP_printk("Chip %d Pmax %d %s", __entry->chip_id,
+                 __entry->pmax, __get_str(reason))
+);
+
 TRACE_EVENT(pstate_sample,
 
        TP_PROTO(u32 core_busy,

diff --git a/kernel/trace/power-traces.c b/kernel/trace/power-traces.c
index eb4220a132ecd1be9002cf35edf82870969d6c82..81b87451c0ea145f93ba41e47dacc6a2acec8189 100644 (file)
--- a/kernel/trace/power-traces.c
+++ b/kernel/trace/power-traces.c
@@ -15,4 +15,5 @@
 
 EXPORT_TRACEPOINT_SYMBOL_GPL(suspend_resume);
 EXPORT_TRACEPOINT_SYMBOL_GPL(cpu_idle);
+EXPORT_TRACEPOINT_SYMBOL_GPL(powernv_throttle);