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cpuquiet: Make stats optional

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Make the per CPU statistics a configureable option.

bug 1049625

Change-Id: I28b248bbbad89a19e8d8d69400733dfd4a2cf052
Signed-off-by: Peter De Schrijver <pdeschrijver@nvidia.com>
Reviewed-on: http://git-master/r/168749
Reviewed-by: Diwakar Tundlam <dtundlam@nvidia.com>
This commit is contained in:
Peter De Schrijver
2012-12-05 16:13:09 +02:00
committed by Huang, Tao
parent c516e3445c
commit 4643c04d29
2 changed files with 56 additions and 33 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/cpuquiet/Kconfig
View File

@@ -10,6 +10,15 @@ config CPUQUIET_FRAMEWORK
if CPUQUIET_FRAMEWORK
config CPUQUIET_STATS
bool "per CPU statistics"
default n
help
Enable up/down count and total time plugged statistics per CPU. These
depend on correct driver input for reliability
If in doubt say N.
config CPUQUIET_GOVERNOR_USERSPACE
bool "userspace"
default y

80
drivers/cpuquiet/driver.c
View File

@@ -26,6 +26,9 @@
#include "cpuquiet.h"
static struct cpuquiet_driver *cpuquiet_curr_driver;
#ifdef CONFIG_CPUQUIET_STATS
struct cpuquiet_cpu_stat {
cputime64_t time_up_total;
u64 last_update;
@@ -33,14 +36,13 @@ struct cpuquiet_cpu_stat {
struct kobject cpu_kobject;
};
struct cpuquiet_cpu_stat *stats;
struct cpu_attribute {
struct attribute attr;
enum { up_down_count, time_up_total } type;
};
static struct cpuquiet_driver *cpuquiet_curr_driver;
struct cpuquiet_cpu_stat *stats;
#define CPU_ATTRIBUTE(_name) \
static struct cpu_attribute _name ## _attr = { \
.attr = {.name = __stringify(_name), .mode = 0444 }, \
@@ -70,34 +72,6 @@ static void stats_update(struct cpuquiet_cpu_stat *stat, bool up)
stat->last_update = cur_jiffies;
}
int cpuquiet_quiesence_cpu(unsigned int cpunumber)
{
int err = -EPERM;
if (cpuquiet_curr_driver && cpuquiet_curr_driver->quiesence_cpu)
err = cpuquiet_curr_driver->quiesence_cpu(cpunumber);
if (!err)
stats_update(stats + cpunumber, 0);
return err;
}
EXPORT_SYMBOL(cpuquiet_quiesence_cpu);
int cpuquiet_wake_cpu(unsigned int cpunumber)
{
int err = -EPERM;
if (cpuquiet_curr_driver && cpuquiet_curr_driver->wake_cpu)
err = cpuquiet_curr_driver->wake_cpu(cpunumber);
if (!err)
stats_update(stats + cpunumber, 1);
return err;
}
EXPORT_SYMBOL(cpuquiet_wake_cpu);
static ssize_t stats_sysfs_show(struct kobject *kobj,
struct attribute *attr, char *buf)
{
@@ -130,31 +104,69 @@ static struct kobj_type ktype_cpu_stats = {
.sysfs_ops = &stats_sysfs_ops,
.default_attrs = cpu_attributes,
};
#endif
int cpuquiet_quiesence_cpu(unsigned int cpunumber)
{
int err = -EPERM;
if (cpuquiet_curr_driver && cpuquiet_curr_driver->quiesence_cpu)
err = cpuquiet_curr_driver->quiesence_cpu(cpunumber);
#ifdef CONFIG_CPUQUIET_STATS
if (!err)
stats_update(stats + cpunumber, 0);
#endif
return err;
}
EXPORT_SYMBOL(cpuquiet_quiesence_cpu);
int cpuquiet_wake_cpu(unsigned int cpunumber)
{
int err = -EPERM;
if (cpuquiet_curr_driver && cpuquiet_curr_driver->wake_cpu)
err = cpuquiet_curr_driver->wake_cpu(cpunumber);
#ifdef CONFIG_CPUQUIET_STATS
if (!err)
stats_update(stats + cpunumber, 1);
#endif
return err;
}
EXPORT_SYMBOL(cpuquiet_wake_cpu);
int cpuquiet_register_driver(struct cpuquiet_driver *drv)
{
int err = -EBUSY;
unsigned int cpu;
struct device *dev;
u64 cur_jiffies;
if (!drv)
return -EINVAL;
#ifdef CONFIG_CPUQUIET_STATS
stats = kzalloc(nr_cpu_ids * sizeof(*stats), GFP_KERNEL);
if (!stats)
return -ENOMEM;
#endif
for_each_possible_cpu(cpu) {
cur_jiffies = get_jiffies_64();
#ifdef CONFIG_CPUQUIET_STATS
u64 cur_jiffies = get_jiffies_64();
stats[cpu].last_update = cur_jiffies;
if (cpu_online(cpu))
stats[cpu].up_down_count = 1;
#endif
dev = get_cpu_device(cpu);
if (dev) {
cpuquiet_add_dev(dev, cpu);
#ifdef CONFIG_CPUQUIET_STATS
cpuquiet_cpu_kobject_init(&stats[cpu].cpu_kobject,
&ktype_cpu_stats, "stats", cpu);
#endif
}
}
@@ -192,7 +204,9 @@ void cpuquiet_unregister_driver(struct cpuquiet_driver *drv)
cpuquiet_curr_driver = NULL;
for_each_possible_cpu(cpu) {
#ifdef CONFIG_CPUQUIET_STATS
kobject_put(&stats[cpu].cpu_kobject);
#endif
cpuquiet_remove_dev(cpu);
}