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Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/davej/cpufreq

Browse source 
* 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/davej/cpufreq:
  [CPUFREQ] Fix BUG: using smp_processor_id() in preemptible code
  [CPUFREQ] Don't export governors for default governor
  [CPUFREQ][6/6] cpufreq: Add idle microaccounting in ondemand governor
  [CPUFREQ][5/6] cpufreq: Changes to get_cpu_idle_time_us(), used by ondemand governor
  [CPUFREQ][4/6] cpufreq_ondemand: Parameterize down differential
  [CPUFREQ][3/6] cpufreq: get_cpu_idle_time() changes in ondemand for idle-microaccounting
  [CPUFREQ][2/6] cpufreq: Change load calculation in ondemand for software coordination
  [CPUFREQ][1/6] cpufreq: Add cpu number parameter to __cpufreq_driver_getavg()
  [CPUFREQ] use deferrable delayed work init in conservative governor
  [CPUFREQ] drivers/cpufreq/cpufreq.c: Adjust error handling code involving cpufreq_cpu_put
  [CPUFREQ] add error handling for cpufreq_register_governor() error
  [CPUFREQ] acpi-cpufreq: add error handling for cpufreq_register_driver() error
  [CPUFREQ] Coding style fixes to arch/x86/kernel/cpu/cpufreq/powernow-k6.c
  [CPUFREQ] Coding style fixes to arch/x86/kernel/cpu/cpufreq/elanfreq.c
This commit is contained in:
Linus Torvalds 2008-10-11 08:49:34 -07:00
commit 098ef215b1
12 changed files with 205 additions and 107 deletions
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13
arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c
View file

@ -256,7 +256,8 @@ static u32 get_cur_val(const cpumask_t *mask)
* Only IA32_APERF/IA32_MPERF ratio is architecturally defined and
* no meaning should be associated with absolute values of these MSRs.
*/
static unsigned int get_measured_perf(unsigned int cpu)
static unsigned int get_measured_perf(struct cpufreq_policy *policy,
unsigned int cpu)
{
union {
struct {
@ -326,7 +327,7 @@ static unsigned int get_measured_perf(unsigned int cpu)
#endif
retval = per_cpu(drv_data, cpu)->max_freq * perf_percent / 100;
retval = per_cpu(drv_data, policy->cpu)->max_freq * perf_percent / 100;
put_cpu();
set_cpus_allowed_ptr(current, &saved_mask);
@ -785,7 +786,11 @@ static int __init acpi_cpufreq_init(void)
if (ret)
return ret;
return cpufreq_register_driver(&acpi_cpufreq_driver);
ret = cpufreq_register_driver(&acpi_cpufreq_driver);
if (ret)
free_percpu(acpi_perf_data);
return ret;
}
static void __exit acpi_cpufreq_exit(void)
@ -795,8 +800,6 @@ static void __exit acpi_cpufreq_exit(void)
cpufreq_unregister_driver(&acpi_cpufreq_driver);
free_percpu(acpi_perf_data);
return;
}
module_param(acpi_pstate_strict, uint, 0644);

42
arch/x86/kernel/cpu/cpufreq/elanfreq.c
View file

@ -25,8 +25,8 @@
#include <linux/cpufreq.h>
#include <asm/msr.h>
#include <asm/timex.h>
#include <asm/io.h>
#include <linux/timex.h>
#include <linux/io.h>
#define REG_CSCIR 0x22 /* Chip Setup and Control Index Register */
#define REG_CSCDR 0x23 /* Chip Setup and Control Data Register */
@ -82,7 +82,7 @@ static unsigned int elanfreq_get_cpu_frequency(unsigned int cpu)
u8 clockspeed_reg; /* Clock Speed Register */
local_irq_disable();
outb_p(0x80,REG_CSCIR);
outb_p(0x80, REG_CSCIR);
clockspeed_reg = inb_p(REG_CSCDR);
local_irq_enable();
@ -98,10 +98,10 @@ static unsigned int elanfreq_get_cpu_frequency(unsigned int cpu)
}
/* 33 MHz is not 32 MHz... */
if ((clockspeed_reg & 0xE0)==0xA0)
if ((clockspeed_reg & 0xE0) == 0xA0)
return 33000;
return ((1<<((clockspeed_reg & 0xE0) >> 5)) * 1000);
return (1<<((clockspeed_reg & 0xE0) >> 5)) * 1000;
}
@ -117,7 +117,7 @@ static unsigned int elanfreq_get_cpu_frequency(unsigned int cpu)
* There is no return value.
*/
static void elanfreq_set_cpu_state (unsigned int state)
static void elanfreq_set_cpu_state(unsigned int state)
{
struct cpufreq_freqs freqs;
@ -144,20 +144,20 @@ static void elanfreq_set_cpu_state (unsigned int state)
*/
local_irq_disable();
outb_p(0x40,REG_CSCIR); /* Disable hyperspeed mode */
outb_p(0x00,REG_CSCDR);
outb_p(0x40, REG_CSCIR); /* Disable hyperspeed mode */
outb_p(0x00, REG_CSCDR);
local_irq_enable(); /* wait till internal pipelines and */
udelay(1000); /* buffers have cleaned up */
local_irq_disable();
/* now, set the CPU clock speed register (0x80) */
outb_p(0x80,REG_CSCIR);
outb_p(elan_multiplier[state].val80h,REG_CSCDR);
outb_p(0x80, REG_CSCIR);
outb_p(elan_multiplier[state].val80h, REG_CSCDR);
/* now, the hyperspeed bit in PMU Force Mode Register (0x40) */
outb_p(0x40,REG_CSCIR);
outb_p(elan_multiplier[state].val40h,REG_CSCDR);
outb_p(0x40, REG_CSCIR);
outb_p(elan_multiplier[state].val40h, REG_CSCDR);
udelay(10000);
local_irq_enable();
@ -173,12 +173,12 @@ static void elanfreq_set_cpu_state (unsigned int state)
* for the hardware supported by the driver.
*/
static int elanfreq_verify (struct cpufreq_policy *policy)
static int elanfreq_verify(struct cpufreq_policy *policy)
{
return cpufreq_frequency_table_verify(policy, &elanfreq_table[0]);
}
static int elanfreq_target (struct cpufreq_policy *policy,
static int elanfreq_target(struct cpufreq_policy *policy,
unsigned int target_freq,
unsigned int relation)
{
@ -205,7 +205,7 @@ static int elanfreq_cpu_init(struct cpufreq_policy *policy)
/* capability check */
if ((c->x86_vendor != X86_VENDOR_AMD) ||
(c->x86 != 4) || (c->x86_model!=10))
(c->x86 != 4) || (c->x86_model != 10))
return -ENODEV;
/* max freq */
@ -213,7 +213,7 @@ static int elanfreq_cpu_init(struct cpufreq_policy *policy)
max_freq = elanfreq_get_cpu_frequency(0);
/* table init */
for (i=0; (elanfreq_table[i].frequency != CPUFREQ_TABLE_END); i++) {
for (i = 0; (elanfreq_table[i].frequency != CPUFREQ_TABLE_END); i++) {
if (elanfreq_table[i].frequency > max_freq)
elanfreq_table[i].frequency = CPUFREQ_ENTRY_INVALID;
}
@ -224,7 +224,7 @@ static int elanfreq_cpu_init(struct cpufreq_policy *policy)
result = cpufreq_frequency_table_cpuinfo(policy, elanfreq_table);
if (result)
return (result);
return result;
cpufreq_frequency_table_get_attr(elanfreq_table, policy->cpu);
return 0;
@ -260,7 +260,7 @@ __setup("elanfreq=", elanfreq_setup);
#endif
static struct freq_attr* elanfreq_attr[] = {
static struct freq_attr *elanfreq_attr[] = {
&cpufreq_freq_attr_scaling_available_freqs,
NULL,
};
@ -284,9 +284,9 @@ static int __init elanfreq_init(void)
/* Test if we have the right hardware */
if ((c->x86_vendor != X86_VENDOR_AMD) ||
(c->x86 != 4) || (c->x86_model!=10)) {
(c->x86 != 4) || (c->x86_model != 10)) {
printk(KERN_INFO "elanfreq: error: no Elan processor found!\n");
return -ENODEV;
return -ENODEV;
}
return cpufreq_register_driver(&elanfreq_driver);
}
@ -298,7 +298,7 @@ static void __exit elanfreq_exit(void)
}
module_param (max_freq, int, 0444);
module_param(max_freq, int, 0444);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Robert Schwebel <r.schwebel@pengutronix.de>, Sven Geggus <sven@geggus.net>");

41
arch/x86/kernel/cpu/cpufreq/powernow-k6.c
View file

@ -15,12 +15,11 @@
#include <linux/slab.h>
#include <asm/msr.h>
#include <asm/timex.h>
#include <asm/io.h>
#include <linux/timex.h>
#include <linux/io.h>
#define POWERNOW_IOPORT 0xfff0 /* it doesn't matter where, as long
as it is unused */
#define POWERNOW_IOPORT 0xfff0 /* it doesn't matter where, as long
as it is unused */
static unsigned int busfreq; /* FSB, in 10 kHz */
static unsigned int max_multiplier;
@ -53,7 +52,7 @@ static int powernow_k6_get_cpu_multiplier(void)
msrval = POWERNOW_IOPORT + 0x1;
wrmsr(MSR_K6_EPMR, msrval, 0); /* enable the PowerNow port */
invalue=inl(POWERNOW_IOPORT + 0x8);
invalue = inl(POWERNOW_IOPORT + 0x8);
msrval = POWERNOW_IOPORT + 0x0;
wrmsr(MSR_K6_EPMR, msrval, 0); /* disable it again */
@ -67,9 +66,9 @@ static int powernow_k6_get_cpu_multiplier(void)
*
* Tries to change the PowerNow! multiplier
*/
static void powernow_k6_set_state (unsigned int best_i)
static void powernow_k6_set_state(unsigned int best_i)
{
unsigned long outvalue=0, invalue=0;
unsigned long outvalue = 0, invalue = 0;
unsigned long msrval;
struct cpufreq_freqs freqs;
@ -90,10 +89,10 @@ static void powernow_k6_set_state (unsigned int best_i)
msrval = POWERNOW_IOPORT + 0x1;
wrmsr(MSR_K6_EPMR, msrval, 0); /* enable the PowerNow port */
invalue=inl(POWERNOW_IOPORT + 0x8);
invalue = inl(POWERNOW_IOPORT + 0x8);
invalue = invalue & 0xf;
outvalue = outvalue | invalue;
outl(outvalue ,(POWERNOW_IOPORT + 0x8));
outl(outvalue , (POWERNOW_IOPORT + 0x8));
msrval = POWERNOW_IOPORT + 0x0;
wrmsr(MSR_K6_EPMR, msrval, 0); /* disable it again */
@ -124,7 +123,7 @@ static int powernow_k6_verify(struct cpufreq_policy *policy)
*
* sets a new CPUFreq policy
*/
static int powernow_k6_target (struct cpufreq_policy *policy,
static int powernow_k6_target(struct cpufreq_policy *policy,
unsigned int target_freq,
unsigned int relation)
{
@ -152,7 +151,7 @@ static int powernow_k6_cpu_init(struct cpufreq_policy *policy)
busfreq = cpu_khz / max_multiplier;
/* table init */
for (i=0; (clock_ratio[i].frequency != CPUFREQ_TABLE_END); i++) {
for (i = 0; (clock_ratio[i].frequency != CPUFREQ_TABLE_END); i++) {
if (clock_ratio[i].index > max_multiplier)
clock_ratio[i].frequency = CPUFREQ_ENTRY_INVALID;
else
@ -165,7 +164,7 @@ static int powernow_k6_cpu_init(struct cpufreq_policy *policy)
result = cpufreq_frequency_table_cpuinfo(policy, clock_ratio);
if (result)
return (result);
return result;
cpufreq_frequency_table_get_attr(clock_ratio, policy->cpu);
@ -176,8 +175,8 @@ static int powernow_k6_cpu_init(struct cpufreq_policy *policy)
static int powernow_k6_cpu_exit(struct cpufreq_policy *policy)
{
unsigned int i;
for (i=0; i<8; i++) {
if (i==max_multiplier)
for (i = 0; i < 8; i++) {
if (i == max_multiplier)
powernow_k6_set_state(i);
}
cpufreq_frequency_table_put_attr(policy->cpu);
@ -189,7 +188,7 @@ static unsigned int powernow_k6_get(unsigned int cpu)
return busfreq * powernow_k6_get_cpu_multiplier();
}
static struct freq_attr* powernow_k6_attr[] = {
static struct freq_attr *powernow_k6_attr[] = {
&cpufreq_freq_attr_scaling_available_freqs,
NULL,
};
@ -227,7 +226,7 @@ static int __init powernow_k6_init(void)
}
if (cpufreq_register_driver(&powernow_k6_driver)) {
release_region (POWERNOW_IOPORT, 16);
release_region(POWERNOW_IOPORT, 16);
return -EINVAL;
}
@ -243,13 +242,13 @@ static int __init powernow_k6_init(void)
static void __exit powernow_k6_exit(void)
{
cpufreq_unregister_driver(&powernow_k6_driver);
release_region (POWERNOW_IOPORT, 16);
release_region(POWERNOW_IOPORT, 16);
}
MODULE_AUTHOR ("Arjan van de Ven <arjanv@redhat.com>, Dave Jones <davej@codemonkey.org.uk>, Dominik Brodowski <linux@brodo.de>");
MODULE_DESCRIPTION ("PowerNow! driver for AMD K6-2+ / K6-3+ processors.");
MODULE_LICENSE ("GPL");
MODULE_AUTHOR("Arjan van de Ven <arjanv@redhat.com>, Dave Jones <davej@codemonkey.org.uk>, Dominik Brodowski <linux@brodo.de>");
MODULE_DESCRIPTION("PowerNow! driver for AMD K6-2+ / K6-3+ processors.");
MODULE_LICENSE("GPL");
module_init(powernow_k6_init);
module_exit(powernow_k6_exit);

30
drivers/cpufreq/cpufreq.c
View file

@ -1467,25 +1467,27 @@ int cpufreq_driver_target(struct cpufreq_policy *policy,
unsigned int target_freq,
unsigned int relation)
{
int ret;
int ret = -EINVAL;
policy = cpufreq_cpu_get(policy->cpu);
if (!policy)
return -EINVAL;
goto no_policy;
if (unlikely(lock_policy_rwsem_write(policy->cpu)))
return -EINVAL;
goto fail;
ret = __cpufreq_driver_target(policy, target_freq, relation);
unlock_policy_rwsem_write(policy->cpu);
fail:
cpufreq_cpu_put(policy);
no_policy:
return ret;
}
EXPORT_SYMBOL_GPL(cpufreq_driver_target);
int __cpufreq_driver_getavg(struct cpufreq_policy *policy)
int __cpufreq_driver_getavg(struct cpufreq_policy *policy, unsigned int cpu)
{
int ret = 0;
@ -1493,8 +1495,8 @@ int __cpufreq_driver_getavg(struct cpufreq_policy *policy)
if (!policy)
return -EINVAL;
if (cpu_online(policy->cpu) && cpufreq_driver->getavg)
ret = cpufreq_driver->getavg(policy->cpu);
if (cpu_online(cpu) && cpufreq_driver->getavg)
ret = cpufreq_driver->getavg(policy, cpu);
cpufreq_cpu_put(policy);
return ret;
@ -1717,13 +1719,17 @@ int cpufreq_update_policy(unsigned int cpu)
{
struct cpufreq_policy *data = cpufreq_cpu_get(cpu);
struct cpufreq_policy policy;
int ret = 0;
int ret;
if (!data)
return -ENODEV;
if (!data) {
ret = -ENODEV;
goto no_policy;
}
if (unlikely(lock_policy_rwsem_write(cpu)))
return -EINVAL;
if (unlikely(lock_policy_rwsem_write(cpu))) {
ret = -EINVAL;
goto fail;
}
dprintk("updating policy for CPU %u\n", cpu);
memcpy(&policy, data, sizeof(struct cpufreq_policy));
@ -1750,7 +1756,9 @@ int cpufreq_update_policy(unsigned int cpu)
unlock_policy_rwsem_write(cpu);
fail:
cpufreq_cpu_put(data);
no_policy:
return ret;
}
EXPORT_SYMBOL(cpufreq_update_policy);

5
drivers/cpufreq/cpufreq_conservative.c
View file

@ -460,6 +460,7 @@ static void do_dbs_timer(struct work_struct *work)
static inline void dbs_timer_init(void)
{
init_timer_deferrable(&dbs_work.timer);
schedule_delayed_work(&dbs_work,
usecs_to_jiffies(dbs_tuners_ins.sampling_rate));
return;
@ -575,13 +576,15 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
return 0;
}
#ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE
static
#endif
struct cpufreq_governor cpufreq_gov_conservative = {
.name = "conservative",
.governor = cpufreq_governor_dbs,
.max_transition_latency = TRANSITION_LATENCY_LIMIT,
.owner = THIS_MODULE,
};
EXPORT_SYMBOL(cpufreq_gov_conservative);
static int __init cpufreq_gov_dbs_init(void)
{

149
drivers/cpufreq/cpufreq_ondemand.c
View file

@ -18,13 +18,19 @@
#include <linux/jiffies.h>
#include <linux/kernel_stat.h>
#include <linux/mutex.h>
#include <linux/hrtimer.h>
#include <linux/tick.h>
#include <linux/ktime.h>
/*
* dbs is used in this file as a shortform for demandbased switching
* It helps to keep variable names smaller, simpler
*/
#define DEF_FREQUENCY_DOWN_DIFFERENTIAL (10)
#define DEF_FREQUENCY_UP_THRESHOLD (80)
#define MICRO_FREQUENCY_DOWN_DIFFERENTIAL (3)
#define MICRO_FREQUENCY_UP_THRESHOLD (95)
#define MIN_FREQUENCY_UP_THRESHOLD (11)
#define MAX_FREQUENCY_UP_THRESHOLD (100)
@ -57,6 +63,7 @@ enum {DBS_NORMAL_SAMPLE, DBS_SUB_SAMPLE};
struct cpu_dbs_info_s {
cputime64_t prev_cpu_idle;
cputime64_t prev_cpu_wall;
cputime64_t prev_cpu_nice;
struct cpufreq_policy *cur_policy;
struct delayed_work work;
struct cpufreq_frequency_table *freq_table;
@ -86,21 +93,24 @@ static struct workqueue_struct *kondemand_wq;
static struct dbs_tuners {
unsigned int sampling_rate;
unsigned int up_threshold;
unsigned int down_differential;
unsigned int ignore_nice;
unsigned int powersave_bias;
} dbs_tuners_ins = {
.up_threshold = DEF_FREQUENCY_UP_THRESHOLD,
.down_differential = DEF_FREQUENCY_DOWN_DIFFERENTIAL,
.ignore_nice = 0,
.powersave_bias = 0,
};
static inline cputime64_t get_cpu_idle_time(unsigned int cpu)
static inline cputime64_t get_cpu_idle_time_jiffy(unsigned int cpu,
cputime64_t *wall)
{
cputime64_t idle_time;
cputime64_t cur_jiffies;
cputime64_t cur_wall_time;
cputime64_t busy_time;
cur_jiffies = jiffies64_to_cputime64(get_jiffies_64());
cur_wall_time = jiffies64_to_cputime64(get_jiffies_64());
busy_time = cputime64_add(kstat_cpu(cpu).cpustat.user,
kstat_cpu(cpu).cpustat.system);
@ -113,7 +123,37 @@ static inline cputime64_t get_cpu_idle_time(unsigned int cpu)
kstat_cpu(cpu).cpustat.nice);
}
idle_time = cputime64_sub(cur_jiffies, busy_time);
idle_time = cputime64_sub(cur_wall_time, busy_time);
if (wall)
*wall = cur_wall_time;
return idle_time;
}
static inline cputime64_t get_cpu_idle_time(unsigned int cpu, cputime64_t *wall)
{
u64 idle_time = get_cpu_idle_time_us(cpu, wall);
if (idle_time == -1ULL)
return get_cpu_idle_time_jiffy(cpu, wall);
if (dbs_tuners_ins.ignore_nice) {
cputime64_t cur_nice;
unsigned long cur_nice_jiffies;
struct cpu_dbs_info_s *dbs_info;
dbs_info = &per_cpu(cpu_dbs_info, cpu);
cur_nice = cputime64_sub(kstat_cpu(cpu).cpustat.nice,
dbs_info->prev_cpu_nice);
/*
* Assumption: nice time between sampling periods will be
* less than 2^32 jiffies for 32 bit sys
*/
cur_nice_jiffies = (unsigned long)
cputime64_to_jiffies64(cur_nice);
dbs_info->prev_cpu_nice = kstat_cpu(cpu).cpustat.nice;
return idle_time + jiffies_to_usecs(cur_nice_jiffies);
}
return idle_time;
}
@ -277,8 +317,8 @@ static ssize_t store_ignore_nice_load(struct cpufreq_policy *policy,
for_each_online_cpu(j) {
struct cpu_dbs_info_s *dbs_info;
dbs_info = &per_cpu(cpu_dbs_info, j);
dbs_info->prev_cpu_idle = get_cpu_idle_time(j);
dbs_info->prev_cpu_wall = get_jiffies_64();
dbs_info->prev_cpu_idle = get_cpu_idle_time(j,
&dbs_info->prev_cpu_wall);
}
mutex_unlock(&dbs_mutex);
@ -334,9 +374,7 @@ static struct attribute_group dbs_attr_group = {
static void dbs_check_cpu(struct cpu_dbs_info_s *this_dbs_info)
{
unsigned int idle_ticks, total_ticks;
unsigned int load = 0;
cputime64_t cur_jiffies;
unsigned int max_load_freq;
struct cpufreq_policy *policy;
unsigned int j;
@ -346,13 +384,7 @@ static void dbs_check_cpu(struct cpu_dbs_info_s *this_dbs_info)
this_dbs_info->freq_lo = 0;
policy = this_dbs_info->cur_policy;
cur_jiffies = jiffies64_to_cputime64(get_jiffies_64());
total_ticks = (unsigned int) cputime64_sub(cur_jiffies,
this_dbs_info->prev_cpu_wall);
this_dbs_info->prev_cpu_wall = get_jiffies_64();
if (!total_ticks)
return;
/*
* Every sampling_rate, we check, if current idle time is less
* than 20% (default), then we try to increase frequency
@ -365,27 +397,44 @@ static void dbs_check_cpu(struct cpu_dbs_info_s *this_dbs_info)
* 5% (default) of current frequency
*/
/* Get Idle Time */
idle_ticks = UINT_MAX;
/* Get Absolute Load - in terms of freq */
max_load_freq = 0;
for_each_cpu_mask_nr(j, policy->cpus) {
cputime64_t total_idle_ticks;
unsigned int tmp_idle_ticks;
struct cpu_dbs_info_s *j_dbs_info;
cputime64_t cur_wall_time, cur_idle_time;
unsigned int idle_time, wall_time;
unsigned int load, load_freq;
int freq_avg;
j_dbs_info = &per_cpu(cpu_dbs_info, j);
total_idle_ticks = get_cpu_idle_time(j);
tmp_idle_ticks = (unsigned int) cputime64_sub(total_idle_ticks,
j_dbs_info->prev_cpu_idle);
j_dbs_info->prev_cpu_idle = total_idle_ticks;
if (tmp_idle_ticks < idle_ticks)
idle_ticks = tmp_idle_ticks;
cur_idle_time = get_cpu_idle_time(j, &cur_wall_time);
wall_time = (unsigned int) cputime64_sub(cur_wall_time,
j_dbs_info->prev_cpu_wall);
j_dbs_info->prev_cpu_wall = cur_wall_time;
idle_time = (unsigned int) cputime64_sub(cur_idle_time,
j_dbs_info->prev_cpu_idle);
j_dbs_info->prev_cpu_idle = cur_idle_time;
if (unlikely(!wall_time || wall_time < idle_time))
continue;
load = 100 * (wall_time - idle_time) / wall_time;
freq_avg = __cpufreq_driver_getavg(policy, j);
if (freq_avg <= 0)
freq_avg = policy->cur;
load_freq = load * freq_avg;
if (load_freq > max_load_freq)
max_load_freq = load_freq;
}
if (likely(total_ticks > idle_ticks))
load = (100 * (total_ticks - idle_ticks)) / total_ticks;
/* Check for frequency increase */
if (load > dbs_tuners_ins.up_threshold) {
if (max_load_freq > dbs_tuners_ins.up_threshold * policy->cur) {
/* if we are already at full speed then break out early */
if (!dbs_tuners_ins.powersave_bias) {
if (policy->cur == policy->max)
@ -412,15 +461,13 @@ static void dbs_check_cpu(struct cpu_dbs_info_s *this_dbs_info)
* can support the current CPU usage without triggering the up
* policy. To be safe, we focus 10 points under the threshold.
*/
if (load < (dbs_tuners_ins.up_threshold - 10)) {
unsigned int freq_next, freq_cur;
freq_cur = __cpufreq_driver_getavg(policy);
if (!freq_cur)
freq_cur = policy->cur;
freq_next = (freq_cur * load) /
(dbs_tuners_ins.up_threshold - 10);
if (max_load_freq <
(dbs_tuners_ins.up_threshold - dbs_tuners_ins.down_differential) *
policy->cur) {
unsigned int freq_next;
freq_next = max_load_freq /
(dbs_tuners_ins.up_threshold -
dbs_tuners_ins.down_differential);
if (!dbs_tuners_ins.powersave_bias) {
__cpufreq_driver_target(policy, freq_next,
@ -526,8 +573,8 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
j_dbs_info = &per_cpu(cpu_dbs_info, j);
j_dbs_info->cur_policy = policy;
j_dbs_info->prev_cpu_idle = get_cpu_idle_time(j);
j_dbs_info->prev_cpu_wall = get_jiffies_64();
j_dbs_info->prev_cpu_idle = get_cpu_idle_time(j,
&j_dbs_info->prev_cpu_wall);
}
this_dbs_info->cpu = cpu;
/*
@ -579,22 +626,42 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
return 0;
}
#ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND
static
#endif
struct cpufreq_governor cpufreq_gov_ondemand = {
.name = "ondemand",
.governor = cpufreq_governor_dbs,
.max_transition_latency = TRANSITION_LATENCY_LIMIT,
.owner = THIS_MODULE,
};
EXPORT_SYMBOL(cpufreq_gov_ondemand);
static int __init cpufreq_gov_dbs_init(void)
{
int err;
cputime64_t wall;
u64 idle_time;
int cpu = get_cpu();
idle_time = get_cpu_idle_time_us(cpu, &wall);
put_cpu();
if (idle_time != -1ULL) {
/* Idle micro accounting is supported. Use finer thresholds */
dbs_tuners_ins.up_threshold = MICRO_FREQUENCY_UP_THRESHOLD;
dbs_tuners_ins.down_differential =
MICRO_FREQUENCY_DOWN_DIFFERENTIAL;
}
kondemand_wq = create_workqueue("kondemand");
if (!kondemand_wq) {
printk(KERN_ERR "Creation of kondemand failed\n");
return -EFAULT;
}
return cpufreq_register_governor(&cpufreq_gov_ondemand);
err = cpufreq_register_governor(&cpufreq_gov_ondemand);
if (err)
destroy_workqueue(kondemand_wq);
return err;
}
static void __exit cpufreq_gov_dbs_exit(void)

4
drivers/cpufreq/cpufreq_performance.c
View file

@ -36,12 +36,14 @@ static int cpufreq_governor_performance(struct cpufreq_policy *policy,
return 0;
}
#ifdef CONFIG_CPU_FREQ_GOV_PERFORMANCE_MODULE
static
#endif
struct cpufreq_governor cpufreq_gov_performance = {
.name = "performance",
.governor = cpufreq_governor_performance,
.owner = THIS_MODULE,
};
EXPORT_SYMBOL(cpufreq_gov_performance);
static int __init cpufreq_gov_performance_init(void)

4
drivers/cpufreq/cpufreq_powersave.c
View file

@ -35,12 +35,14 @@ static int cpufreq_governor_powersave(struct cpufreq_policy *policy,
return 0;
}
#ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE
static
#endif
struct cpufreq_governor cpufreq_gov_powersave = {
.name = "powersave",
.governor = cpufreq_governor_powersave,
.owner = THIS_MODULE,
};
EXPORT_SYMBOL(cpufreq_gov_powersave);
static int __init cpufreq_gov_powersave_init(void)
{

4
drivers/cpufreq/cpufreq_userspace.c
View file

@ -187,6 +187,9 @@ static int cpufreq_governor_userspace(struct cpufreq_policy *policy,
}
#ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE
static
#endif
struct cpufreq_governor cpufreq_gov_userspace = {
.name = "userspace",
.governor = cpufreq_governor_userspace,
@ -194,7 +197,6 @@ struct cpufreq_governor cpufreq_gov_userspace = {
.show_setspeed = show_speed,
.owner = THIS_MODULE,
};
EXPORT_SYMBOL(cpufreq_gov_userspace);
static int __init cpufreq_gov_userspace_init(void)
{

7
include/linux/cpufreq.h
View file

@ -187,7 +187,8 @@ extern int __cpufreq_driver_target(struct cpufreq_policy *policy,
unsigned int relation);
extern int __cpufreq_driver_getavg(struct cpufreq_policy *policy);
extern int __cpufreq_driver_getavg(struct cpufreq_policy *policy,
unsigned int cpu);
int cpufreq_register_governor(struct cpufreq_governor *governor);
void cpufreq_unregister_governor(struct cpufreq_governor *governor);
@ -226,7 +227,9 @@ struct cpufreq_driver {
unsigned int (*get) (unsigned int cpu);
/* optional */
unsigned int (*getavg) (unsigned int cpu);
unsigned int (*getavg) (struct cpufreq_policy *policy,
unsigned int cpu);
int (*exit) (struct cpufreq_policy *policy);
int (*suspend) (struct cpufreq_policy *policy, pm_message_t pmsg);
int (*resume) (struct cpufreq_policy *policy);

2
include/linux/tick.h
View file

@ -126,7 +126,7 @@ static inline ktime_t tick_nohz_get_sleep_length(void)
return len;
}
static inline void tick_nohz_stop_idle(int cpu) { }
static inline u64 get_cpu_idle_time_us(int cpu, u64 *unused) { return 0; }
static inline u64 get_cpu_idle_time_us(int cpu, u64 *unused) { return -1; }
# endif /* !NO_HZ */
#endif

11
kernel/time/tick-sched.c
View file

@ -20,6 +20,7 @@
#include <linux/profile.h>
#include <linux/sched.h>
#include <linux/tick.h>
#include <linux/module.h>
#include <asm/irq_regs.h>
@ -190,9 +191,17 @@ u64 get_cpu_idle_time_us(int cpu, u64 *last_update_time)
{
struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);
*last_update_time = ktime_to_us(ts->idle_lastupdate);
if (!tick_nohz_enabled)
return -1;
if (ts->idle_active)
*last_update_time = ktime_to_us(ts->idle_lastupdate);
else
*last_update_time = ktime_to_us(ktime_get());
return ktime_to_us(ts->idle_sleeptime);
}
EXPORT_SYMBOL_GPL(get_cpu_idle_time_us);
/**
* tick_nohz_stop_sched_tick - stop the idle tick from the idle task