tracing, perf: Convert the power tracer into an event tracer

This patch converts the existing power tracer into an event tracer,
so that power events (C states and frequency changes) can be
tracked via "perf".

This also removes the perl script that was used to demo the tracer;
its functionality is being replaced entirely with timechart.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <20090912130542.6d314860@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 9 insertions, 19 deletions

diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index 071166a4ba83..7b60e3906889 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -9,7 +9,7 @@
 #include <linux/pm.h>
 #include <linux/clockchips.h>
 #include <linux/random.h>
-#include <trace/power.h>
+#include <trace/events/power.h>
 #include <asm/system.h>
 #include <asm/apic.h>
 #include <asm/syscalls.h>
@@ -25,9 +25,6 @@ EXPORT_SYMBOL(idle_nomwait);
 
 struct kmem_cache *task_xstate_cachep;
 
-DEFINE_TRACE(power_start);
-DEFINE_TRACE(power_end);
-
 int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
 {
         *dst = *src;
@@ -299,9 +296,7 @@ static inline int hlt_use_halt(void)
 void default_idle(void)
 {
         if (hlt_use_halt()) {
-                struct power_trace it;
-
-                trace_power_start(&it, POWER_CSTATE, 1);
+                trace_power_start(POWER_CSTATE, 1);
                 current_thread_info()->status &= ~TS_POLLING;
                 /*
                  * TS_POLLING-cleared state must be visible before we
@@ -314,7 +309,7 @@ void default_idle(void)
                 else
                         local_irq_enable();
                 current_thread_info()->status |= TS_POLLING;
-                trace_power_end(&it);
+                trace_power_end(0);
         } else {
                 local_irq_enable();
                 /* loop is done by the caller */
@@ -372,9 +367,7 @@ EXPORT_SYMBOL_GPL(cpu_idle_wait);
  */
 void mwait_idle_with_hints(unsigned long ax, unsigned long cx)
 {
-        struct power_trace it;
-
-        trace_power_start(&it, POWER_CSTATE, (ax>>4)+1);
+        trace_power_start(POWER_CSTATE, (ax>>4)+1);
         if (!need_resched()) {
                 if (cpu_has(&current_cpu_data, X86_FEATURE_CLFLUSH_MONITOR))
                         clflush((void *)&current_thread_info()->flags);
@@ -384,15 +377,14 @@ void mwait_idle_with_hints(unsigned long ax, unsigned long cx)
                 if (!need_resched())
                         __mwait(ax, cx);
         }
-        trace_power_end(&it);
+        trace_power_end(0);
 }
 
 /* Default MONITOR/MWAIT with no hints, used for default C1 state */
 static void mwait_idle(void)
 {
-        struct power_trace it;
         if (!need_resched()) {
-                trace_power_start(&it, POWER_CSTATE, 1);
+                trace_power_start(POWER_CSTATE, 1);
                 if (cpu_has(&current_cpu_data, X86_FEATURE_CLFLUSH_MONITOR))
                         clflush((void *)&current_thread_info()->flags);
 
@@ -402,7 +394,7 @@ static void mwait_idle(void)
                         __sti_mwait(0, 0);
                 else
                         local_irq_enable();
-                trace_power_end(&it);
+                trace_power_end(0);
         } else
                 local_irq_enable();
 }
@@ -414,13 +406,11 @@ static void mwait_idle(void)
  */
 static void poll_idle(void)
 {
-        struct power_trace it;
-
-        trace_power_start(&it, POWER_CSTATE, 0);
+        trace_power_start(POWER_CSTATE, 0);
         local_irq_enable();
         while (!need_resched())
                 cpu_relax();
-        trace_power_end(&it);
+        trace_power_end(0);
 }
 
 /*