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More ACPI and power management updates for 3.17-rc1

Browse source 
- Fix for an ACPI-based device hotplug regression introduced in 3.14
    that causes a kernel panic to trigger when memory hot-remove is
    attempted with CONFIG_ACPI_HOTPLUG_MEMORY unset from Tang Chen.
 
  - Fix for a cpufreq regression introduced in 3.16 that triggers a
    "sleeping function called from invalid context" bug in
    dev_pm_opp_init_cpufreq_table() from Stephen Boyd.
 
  - ACPI battery driver fix for a warning message added in 3.16 that
    prints silly stuff sometimes from Mariusz Ceier.
 
  - Hibernation fix for safer handling of mismatches in the 820 memory
    map between the configurations during image creation and during
    the subsequent restore from Chun-Yi Lee.
 
  - ACPI processor driver fix to handle CPU hotplug notifications
    correctly during system suspend/resume from Lan Tianyu.
 
  - Series of four cpuidle menu governor cleanups that also should
    speed it up a bit from Mel Gorman.
 
  - Fixes for the speedstep-smi, integrator, cpu0 and arm_big_little
    cpufreq drivers from Hans Wennborg, Himangi Saraogi, Markus Pargmann
    and Uwe Kleine-König.
 
  - Version 3.0 of the analyze_suspend.py suspend profiling tool
    from Todd E Brandt.
 
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Merge tag 'pm+acpi-3.17-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull more ACPI and power management updates from Rafael Wysocki:
 "These are a couple of regression fixes, cpuidle menu governor
  optimizations, fixes for ACPI proccessor and battery drivers,
  hibernation fix to avoid problems related to the e820 memory map,
  fixes for a few cpufreq drivers and a new version of the suspend
  profiling tool analyze_suspend.py.

  Specifics:

   - Fix for an ACPI-based device hotplug regression introduced in 3.14
     that causes a kernel panic to trigger when memory hot-remove is
     attempted with CONFIG_ACPI_HOTPLUG_MEMORY unset from Tang Chen

   - Fix for a cpufreq regression introduced in 3.16 that triggers a
     "sleeping function called from invalid context" bug in
     dev_pm_opp_init_cpufreq_table() from Stephen Boyd

   - ACPI battery driver fix for a warning message added in 3.16 that
     prints silly stuff sometimes from Mariusz Ceier

   - Hibernation fix for safer handling of mismatches in the 820 memory
     map between the configurations during image creation and during the
     subsequent restore from Chun-Yi Lee

   - ACPI processor driver fix to handle CPU hotplug notifications
     correctly during system suspend/resume from Lan Tianyu

   - Series of four cpuidle menu governor cleanups that also should
     speed it up a bit from Mel Gorman

   - Fixes for the speedstep-smi, integrator, cpu0 and arm_big_little
     cpufreq drivers from Hans Wennborg, Himangi Saraogi, Markus
     Pargmann and Uwe Kleine-König

   - Version 3.0 of the analyze_suspend.py suspend profiling tool from
     Todd E Brandt"

* tag 'pm+acpi-3.17-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  ACPI / battery: Fix warning message in acpi_battery_get_state()
  PM / tools: analyze_suspend.py: update to v3.0
  cpufreq: arm_big_little: fix module license spec
  cpufreq: speedstep-smi: fix decimal printf specifiers
  ACPI / hotplug: Check scan handlers in acpi_scan_hot_remove()
  cpufreq: OPP: Avoid sleeping while atomic
  cpufreq: cpu0: Do not print error message when deferring
  cpufreq: integrator: Use set_cpus_allowed_ptr
  PM / hibernate: avoid unsafe pages in e820 reserved regions
  ACPI / processor: Make acpi_cpu_soft_notify() process CPU FROZEN events
  cpuidle: menu: Lookup CPU runqueues less
  cpuidle: menu: Call nr_iowait_cpu less times
  cpuidle: menu: Use ktime_to_us instead of reinventing the wheel
  cpuidle: menu: Use shifts when calculating averages where possible
This commit is contained in:
Linus Torvalds 2014-08-14 18:13:46 -06:00
commit c9d26423e5
15 changed files with 3051 additions and 878 deletions
Download patch file Download diff file Expand all files Collapse all files

43
drivers/cpuidle/governors/menu.c
View file

@ -31,7 +31,8 @@
* The default values do not overflow.
*/
#define BUCKETS 12
#define INTERVALS 8
#define INTERVAL_SHIFT 3
#define INTERVALS (1UL << INTERVAL_SHIFT)
#define RESOLUTION 1024
#define DECAY 8
#define MAX_INTERESTING 50000
@ -133,15 +134,12 @@ struct menu_device {
#define LOAD_INT(x) ((x) >> FSHIFT)
#define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
static int get_loadavg(void)
static inline int get_loadavg(unsigned long load)
{
unsigned long this = this_cpu_load();
return LOAD_INT(this) * 10 + LOAD_FRAC(this) / 10;
return LOAD_INT(load) * 10 + LOAD_FRAC(load) / 10;
}
static inline int which_bucket(unsigned int duration)
static inline int which_bucket(unsigned int duration, unsigned long nr_iowaiters)
{
int bucket = 0;
@ -151,7 +149,7 @@ static inline int which_bucket(unsigned int duration)
* This allows us to calculate
* E(duration)|iowait
*/
if (nr_iowait_cpu(smp_processor_id()))
if (nr_iowaiters)
bucket = BUCKETS/2;
if (duration < 10)
@ -174,16 +172,16 @@ static inline int which_bucket(unsigned int duration)
* to be, the higher this multiplier, and thus the higher
* the barrier to go to an expensive C state.
*/
static inline int performance_multiplier(void)
static inline int performance_multiplier(unsigned long nr_iowaiters, unsigned long load)
{
int mult = 1;
/* for higher loadavg, we are more reluctant */
mult += 2 * get_loadavg();
mult += 2 * get_loadavg(load);
/* for IO wait tasks (per cpu!) we add 5x each */
mult += 10 * nr_iowait_cpu(smp_processor_id());
mult += 10 * nr_iowaiters;
return mult;
}
@ -227,7 +225,10 @@ again:
max = value;
}
}
do_div(avg, divisor);
if (divisor == INTERVALS)
avg >>= INTERVAL_SHIFT;
else
do_div(avg, divisor);
/* Then try to determine standard deviation */
stddev = 0;
@ -238,7 +239,11 @@ again:
stddev += diff * diff;
}
}
do_div(stddev, divisor);
if (divisor == INTERVALS)
stddev >>= INTERVAL_SHIFT;
else
do_div(stddev, divisor);
/*
* The typical interval is obtained when standard deviation is small
* or standard deviation is small compared to the average interval.
@ -288,7 +293,7 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev)
int latency_req = pm_qos_request(PM_QOS_CPU_DMA_LATENCY);
int i;
unsigned int interactivity_req;
struct timespec t;
unsigned long nr_iowaiters, cpu_load;
if (data->needs_update) {
menu_update(drv, dev);
@ -302,12 +307,10 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev)
return 0;
/* determine the expected residency time, round up */
t = ktime_to_timespec(tick_nohz_get_sleep_length());
data->next_timer_us =
t.tv_sec * USEC_PER_SEC + t.tv_nsec / NSEC_PER_USEC;
data->next_timer_us = ktime_to_us(tick_nohz_get_sleep_length());
data->bucket = which_bucket(data->next_timer_us);
get_iowait_load(&nr_iowaiters, &cpu_load);
data->bucket = which_bucket(data->next_timer_us, nr_iowaiters);
/*
* Force the result of multiplication to be 64 bits even if both
@ -325,7 +328,7 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev)
* duration / latency ratio. Adjust the latency limit if
* necessary.
*/
interactivity_req = data->predicted_us / performance_multiplier();
interactivity_req = data->predicted_us / performance_multiplier(nr_iowaiters, cpu_load);
if (latency_req > interactivity_req)
latency_req = interactivity_req;