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authorArjan van de Ven <arjan@infradead.org>2008-11-23 16:49:58 -0800
committerIngo Molnar <mingo@elte.hu>2008-11-26 08:29:32 +0100
commitf3f47a6768a29448866da4422b6f6bee485c947f (patch)
treeba4bf1b79cbd13412871eec50250294d7140fd09 /include
parent509dceef6470442d8c7b8a43ec34125205840b3c (diff)
tracing: add "power-tracer": C/P state tracer to help power optimization
Impact: new "power-tracer" ftrace plugin This patch adds a C/P-state ftrace plugin that will generate detailed statistics about the C/P-states that are being used, so that we can look at detailed decisions that the C/P-state code is making, rather than the too high level "average" that we have today. An example way of using this is: mount -t debugfs none /sys/kernel/debug echo cstate > /sys/kernel/debug/tracing/current_tracer echo 1 > /sys/kernel/debug/tracing/tracing_enabled sleep 1 echo 0 > /sys/kernel/debug/tracing/tracing_enabled cat /sys/kernel/debug/tracing/trace | perl scripts/trace/cstate.pl > out.svg Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include')
-rw-r--r--include/linux/ftrace.h29
1 files changed, 29 insertions, 0 deletions
diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index 7854d87b97b..0df28866620 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -311,6 +311,35 @@ ftrace_init_module(struct module *mod,
unsigned long *start, unsigned long *end) { }
#endif
+enum {
+ POWER_NONE = 0,
+ POWER_CSTATE = 1,
+ POWER_PSTATE = 2,
+};
+
+struct power_trace {
+#ifdef CONFIG_POWER_TRACER
+ ktime_t stamp;
+ ktime_t end;
+ int type;
+ int state;
+#endif
+};
+
+#ifdef CONFIG_POWER_TRACER
+extern void trace_power_start(struct power_trace *it, unsigned int type,
+ unsigned int state);
+extern void trace_power_mark(struct power_trace *it, unsigned int type,
+ unsigned int state);
+extern void trace_power_end(struct power_trace *it);
+#else
+static inline void trace_power_start(struct power_trace *it, unsigned int type,
+ unsigned int state) { }
+static inline void trace_power_mark(struct power_trace *it, unsigned int type,
+ unsigned int state) { }
+static inline void trace_power_end(struct power_trace *it) { }
+#endif
+
/*
* Structure that defines a return function trace.