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Subject[PATCH] tracing: add event power_frequency to powernow-k8 driver
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This patch adds frequency tracing to the powernow-k8 cpufreq driver

diff --git a/arch/x86/kernel/cpu/cpufreq/powernow-k8.c
b/arch/x86/kernel/cpu/cpufreq/powernow-k8.c
index 6e44519..99034e7 100644
--- a/arch/x86/kernel/cpu/cpufreq/powernow-k8.c
+++ b/arch/x86/kernel/cpu/cpufreq/powernow-k8.c
@@ -37,6 +37,10 @@
#include <linux/io.h>
#include <linux/delay.h>

+#ifdef CONFIG_POWER_TRACER
+#include <trace/events/power.h> /* tracing power events */
+# endif /* CONFIG_POWER_TRACER */
+
#include <asm/msr.h>

#include <linux/acpi.h>
@@ -54,6 +58,25 @@ static DEFINE_PER_CPU(struct powernow_k8_data *,
powernow_data);

static int cpu_family = CPU_OPTERON;

+
+/* only trace power if it is selected */
+#ifdef CONFIG_POWER_TRACER
+ /* trace power event on a specific cpu/core */
+ static void trace_power_event(unsigned int *freq){
+ trace_power_frequency(POWER_PSTATE, *freq);
+ }
+
+ #define TRACE_POWER_FREQUENCY_EVENT(i,avail_cores, frequency)
\
+ for_each_cpu(i,avail_cores)
\
+ smp_call_function_single(i, trace_power_event,
&frequency, 1);
+
+#else /* !CONFIG_POWER_TRACER */
+
+ #define TRACE_POWER_FREQUENCY_EVENT(i,avail_cores, frequency) ;
+
+# endif /* end CONFIG_POWER_TRACER */
+
+
#ifndef CONFIG_SMP
static inline const struct cpumask *cpu_core_mask(int cpu)
{
@@ -1074,6 +1097,8 @@ static int transition_frequency_fidvid(struct
powernow_k8_data *data,
res = transition_fid_vid(data, fid, vid);
freqs.new = find_khz_freq_from_fid(data->currfid);

+ TRACE_POWER_FREQUENCY_EVENT(i,data->available_cores, freqs.new);
+
for_each_cpu(i, data->available_cores) {
freqs.cpu = i;
cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
@@ -1107,6 +1132,8 @@ static int transition_frequency_pstate(struct
powernow_k8_data *data,
res = transition_pstate(data, pstate);
freqs.new = find_khz_freq_from_pstate(data->powernow_table,
pstate);

+ TRACE_POWER_FREQUENCY_EVENT(i,data->available_cores, freqs.new);
+
for_each_cpu(i, data->available_cores) {
freqs.cpu = i;
cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);



--
Robert Schoene
Technische Universitaet Dresden
Zentrum fuer Informationsdienste und Hochleistungsrechnen
01062 Dresden

Tel.: (0351) 463-42483, Fax: (0351) 463-37773
E-Mail: Robert.Schoene@tu-dresden.de



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