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Subject[PATCH v3 1/2] cpufreq: powernv/tracing: Add powernv_throttle tracepoint
Date
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>
CC: Ingo Molnar <mingo@redhat.com>
CC: Steven Rostedt <rostedt@goodmis.org>
---
No changes from v2.

Changes from v1:
- Export the tracepoint

include/trace/events/power.h | 22 ++++++++++++++++++++++
kernel/trace/power-traces.c | 1 +
2 files changed, 23 insertions(+)

diff --git a/include/trace/events/power.h b/include/trace/events/power.h
index 284244e..19e5030 100644
--- 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 eb4220a..81b8745 100644
--- 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);

--
1.9.3


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