ondemand: Make the iowait-is-busy time a sysfs tunable

Pavel Machek pointed out that not all CPUs have an efficient
idle at high frequency. Specifically, older Intel and various
AMD cpus would get a higher powerusage when copying files from
USB.

Mike Chan pointed out that the same is true for various ARM
chips as well.

Thomas Renninger suggested to make this a sysfs tunable with a
reasonable default.

This patch adds a sysfs tunable for the new behavior, and uses
a very simple function to determine a reasonable default,
depending on the CPU vendor/type.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Acked-by: Rik van Riel <riel@redhat.com>
Acked-by: Pavel Machek <pavel@ucw.cz>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: davej@redhat.com
LKML-Reference: <20100509082651.46914d04@infradead.org>
[ minor tidyup ]
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 46 insertions, 1 deletions

diff --git a/drivers/cpufreq/cpufreq_ondemand.c b/drivers/cpufreq/cpufreq_ondemand.c
index ed472f8dfb72..8e9dbdc6c700 100644
--- a/drivers/cpufreq/cpufreq_ondemand.c
+++ b/drivers/cpufreq/cpufreq_ondemand.c
@@ -109,6 +109,7 @@ static struct dbs_tuners {
         unsigned int down_differential;
         unsigned int ignore_nice;
         unsigned int powersave_bias;
+        unsigned int io_is_busy;
 } dbs_tuners_ins = {
         .up_threshold = DEF_FREQUENCY_UP_THRESHOLD,
         .down_differential = DEF_FREQUENCY_DOWN_DIFFERENTIAL,
@@ -260,6 +261,7 @@ static ssize_t show_##file_name						\
         return sprintf(buf, "%u\n", dbs_tuners_ins.object);             \
 }
 show_one(sampling_rate, sampling_rate);
+show_one(io_is_busy, io_is_busy);
 show_one(up_threshold, up_threshold);
 show_one(ignore_nice_load, ignore_nice);
 show_one(powersave_bias, powersave_bias);
@@ -310,6 +312,23 @@ static ssize_t store_sampling_rate(struct kobject *a, struct attribute *b,
         return count;
 }
 
+static ssize_t store_io_is_busy(struct kobject *a, struct attribute *b,
+                                   const char *buf, size_t count)
+{
+        unsigned int input;
+        int ret;
+
+        ret = sscanf(buf, "%u", &input);
+        if (ret != 1)
+                return -EINVAL;
+
+        mutex_lock(&dbs_mutex);
+        dbs_tuners_ins.io_is_busy = !!input;
+        mutex_unlock(&dbs_mutex);
+
+        return count;
+}
+
 static ssize_t store_up_threshold(struct kobject *a, struct attribute *b,
                                   const char *buf, size_t count)
 {
@@ -392,6 +411,7 @@ static struct global_attr _name = \
 __ATTR(_name, 0644, show_##_name, store_##_name)
 
 define_one_rw(sampling_rate);
+define_one_rw(io_is_busy);
 define_one_rw(up_threshold);
 define_one_rw(ignore_nice_load);
 define_one_rw(powersave_bias);
@@ -403,6 +423,7 @@ static struct attribute *dbs_attributes[] = {
         &up_threshold.attr,
         &ignore_nice_load.attr,
         &powersave_bias.attr,
+        &io_is_busy.attr,
         NULL
 };
 
@@ -527,7 +548,7 @@ static void dbs_check_cpu(struct cpu_dbs_info_s *this_dbs_info)
                  * from the cpu idle time.
                  */
 
-                if (idle_time >= iowait_time)
+                if (dbs_tuners_ins.io_is_busy && idle_time >= iowait_time)
                         idle_time -= iowait_time;
 
                 if (unlikely(!wall_time || wall_time < idle_time))
@@ -643,6 +664,29 @@ static inline void dbs_timer_exit(struct cpu_dbs_info_s *dbs_info)
         cancel_delayed_work_sync(&dbs_info->work);
 }
 
+/*
+ * Not all CPUs want IO time to be accounted as busy; this dependson how
+ * efficient idling at a higher frequency/voltage is.
+ * Pavel Machek says this is not so for various generations of AMD and old
+ * Intel systems.
+ * Mike Chan (androidlcom) calis this is also not true for ARM.
+ * Because of this, whitelist specific known (series) of CPUs by default, and
+ * leave all others up to the user.
+ */
+static int should_io_be_busy(void)
+{
+#if defined(CONFIG_X86)
+        /*
+         * For Intel, Core 2 (model 15) andl later have an efficient idle.
+         */
+        if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL &&
+            boot_cpu_data.x86 == 6 &&
+            boot_cpu_data.x86_model >= 15)
+                return 1;
+#endif
+        return 0;
+}
+
 static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
                                    unsigned int event)
 {
@@ -705,6 +749,7 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
                         dbs_tuners_ins.sampling_rate =
                                 max(min_sampling_rate,
                                     latency * LATENCY_MULTIPLIER);
+                        dbs_tuners_ins.io_is_busy = should_io_be_busy();
                 }
                 mutex_unlock(&dbs_mutex);