diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2014-08-14 18:13:46 -0600 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-08-14 18:13:46 -0600 |
commit | c9d26423e56ce1ab4d786f92aebecf859d419293 (patch) | |
tree | 9ad3b09055d299c220fd17fa2715143e859de7f8 /drivers/cpuidle/governors | |
parent | a11c5c9ef6dc562fc7df7aaf7911569a85f4d71c (diff) | |
parent | af5b7e84d022fdea373038d831bb4ca2c0e82108 (diff) |
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
Diffstat (limited to 'drivers/cpuidle/governors')
-rw-r--r-- | drivers/cpuidle/governors/menu.c | 43 |
1 files changed, 23 insertions, 20 deletions
diff --git a/drivers/cpuidle/governors/menu.c b/drivers/cpuidle/governors/menu.c index ae5a42595e1c..34db2fb3ef1e 100644 --- a/drivers/cpuidle/governors/menu.c +++ b/drivers/cpuidle/governors/menu.c @@ -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; |