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00bfe05889
mirror_ubuntu-kernels/drivers/cpufreq
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Stratos Karafotis 00bfe05889 cpufreq: conservative: Decrease frequency faster for deferred updates 
Conservative governor changes the CPU frequency in steps.
That means that if a CPU runs at max frequency, it will need several
sampling periods to return to min frequency when the workload
is finished.

If the update function that calculates the load and target frequency
is deferred, the governor might need even more time to decrease the
frequency.

This may have impact to power consumption and after all conservative
should decrease the frequency if there is no workload at every sampling
rate.

To resolve the above issue calculate the number of sampling periods
that the update is deferred. Considering that for each sampling period
conservative should drop the frequency by a freq_step because the
CPU was idle apply the proper subtraction to requested frequency.

Below, the kernel trace with and without this patch. First an
intensive workload is applied on a specific CPU. Then the workload
is removed and the CPU goes to idle.

WITHOUT

     <idle>-0     [007] dN..   620.329153: cpu_idle: state=4294967295 cpu_id=7
kworker/7:2-556   [007] ....   620.350857: cpu_frequency: state=1700000 cpu_id=7
kworker/7:2-556   [007] ....   620.370856: cpu_frequency: state=1900000 cpu_id=7
kworker/7:2-556   [007] ....   620.390854: cpu_frequency: state=2100000 cpu_id=7
kworker/7:2-556   [007] ....   620.411853: cpu_frequency: state=2200000 cpu_id=7
kworker/7:2-556   [007] ....   620.432854: cpu_frequency: state=2400000 cpu_id=7
kworker/7:2-556   [007] ....   620.453854: cpu_frequency: state=2600000 cpu_id=7
kworker/7:2-556   [007] ....   620.494856: cpu_frequency: state=2900000 cpu_id=7
kworker/7:2-556   [007] ....   620.515856: cpu_frequency: state=3100000 cpu_id=7
kworker/7:2-556   [007] ....   620.536858: cpu_frequency: state=3300000 cpu_id=7
kworker/7:2-556   [007] ....   620.557857: cpu_frequency: state=3401000 cpu_id=7
     <idle>-0     [007] d...   669.591363: cpu_idle: state=4 cpu_id=7
     <idle>-0     [007] d...   669.591939: cpu_idle: state=4294967295 cpu_id=7
     <idle>-0     [007] d...   669.591980: cpu_idle: state=4 cpu_id=7
     <idle>-0     [007] dN..   669.591989: cpu_idle: state=4294967295 cpu_id=7
...
     <idle>-0     [007] d...   670.201224: cpu_idle: state=4 cpu_id=7
     <idle>-0     [007] d...   670.221975: cpu_idle: state=4294967295 cpu_id=7
kworker/7:2-556   [007] ....   670.222016: cpu_frequency: state=3300000 cpu_id=7
     <idle>-0     [007] d...   670.222026: cpu_idle: state=4 cpu_id=7
     <idle>-0     [007] d...   670.234964: cpu_idle: state=4294967295 cpu_id=7
...
     <idle>-0     [007] d...   670.801251: cpu_idle: state=4 cpu_id=7
     <idle>-0     [007] d...   671.236046: cpu_idle: state=4294967295 cpu_id=7
kworker/7:2-556   [007] ....   671.236073: cpu_frequency: state=3100000 cpu_id=7
     <idle>-0     [007] d...   671.236112: cpu_idle: state=4 cpu_id=7
     <idle>-0     [007] d...   671.393437: cpu_idle: state=4294967295 cpu_id=7
...
     <idle>-0     [007] d...   671.401277: cpu_idle: state=4 cpu_id=7
     <idle>-0     [007] d...   671.404083: cpu_idle: state=4294967295 cpu_id=7
kworker/7:2-556   [007] ....   671.404111: cpu_frequency: state=2900000 cpu_id=7
     <idle>-0     [007] d...   671.404125: cpu_idle: state=4 cpu_id=7
     <idle>-0     [007] d...   671.404974: cpu_idle: state=4294967295 cpu_id=7
...
     <idle>-0     [007] d...   671.501180: cpu_idle: state=4 cpu_id=7
     <idle>-0     [007] d...   671.995414: cpu_idle: state=4294967295 cpu_id=7
kworker/7:2-556   [007] ....   671.995459: cpu_frequency: state=2800000 cpu_id=7
     <idle>-0     [007] d...   671.995469: cpu_idle: state=4 cpu_id=7
     <idle>-0     [007] d...   671.996287: cpu_idle: state=4294967295 cpu_id=7
...
     <idle>-0     [007] d...   672.001305: cpu_idle: state=4 cpu_id=7
     <idle>-0     [007] d...   672.078374: cpu_idle: state=4294967295 cpu_id=7
kworker/7:2-556   [007] ....   672.078410: cpu_frequency: state=2600000 cpu_id=7
     <idle>-0     [007] d...   672.078419: cpu_idle: state=4 cpu_id=7
     <idle>-0     [007] d...   672.158020: cpu_idle: state=4294967295 cpu_id=7
kworker/7:2-556   [007] ....   672.158040: cpu_frequency: state=2400000 cpu_id=7
     <idle>-0     [007] d...   672.158044: cpu_idle: state=4 cpu_id=7
     <idle>-0     [007] d...   672.160038: cpu_idle: state=4294967295 cpu_id=7
...
     <idle>-0     [007] d...   672.234557: cpu_idle: state=4 cpu_id=7
     <idle>-0     [007] d...   672.237121: cpu_idle: state=4294967295 cpu_id=7
kworker/7:2-556   [007] ....   672.237174: cpu_frequency: state=2100000 cpu_id=7
     <idle>-0     [007] d...   672.237186: cpu_idle: state=4 cpu_id=7
     <idle>-0     [007] d...   672.237778: cpu_idle: state=4294967295 cpu_id=7
...
     <idle>-0     [007] d...   672.267902: cpu_idle: state=4 cpu_id=7
     <idle>-0     [007] d...   672.269860: cpu_idle: state=4294967295 cpu_id=7
kworker/7:2-556   [007] ....   672.269906: cpu_frequency: state=1900000 cpu_id=7
     <idle>-0     [007] d...   672.269914: cpu_idle: state=4 cpu_id=7
     <idle>-0     [007] d...   672.271902: cpu_idle: state=4294967295 cpu_id=7
...
     <idle>-0     [007] d...   672.751342: cpu_idle: state=4 cpu_id=7
     <idle>-0     [007] d...   672.823056: cpu_idle: state=4294967295 cpu_id=7
kworker/7:2-556   [007] ....   672.823095: cpu_frequency: state=1600000 cpu_id=7

WITH

     <idle>-0     [007] dN..  4380.928009: cpu_idle: state=4294967295 cpu_id=7
kworker/7:2-399   [007] ....  4380.949767: cpu_frequency: state=2000000 cpu_id=7
kworker/7:2-399   [007] ....  4380.969765: cpu_frequency: state=2200000 cpu_id=7
kworker/7:2-399   [007] ....  4381.009766: cpu_frequency: state=2500000 cpu_id=7
kworker/7:2-399   [007] ....  4381.029767: cpu_frequency: state=2600000 cpu_id=7
kworker/7:2-399   [007] ....  4381.049769: cpu_frequency: state=2800000 cpu_id=7
kworker/7:2-399   [007] ....  4381.069769: cpu_frequency: state=3000000 cpu_id=7
kworker/7:2-399   [007] ....  4381.089771: cpu_frequency: state=3100000 cpu_id=7
kworker/7:2-399   [007] ....  4381.109772: cpu_frequency: state=3400000 cpu_id=7
kworker/7:2-399   [007] ....  4381.129773: cpu_frequency: state=3401000 cpu_id=7
     <idle>-0     [007] d...  4428.226159: cpu_idle: state=1 cpu_id=7
     <idle>-0     [007] d...  4428.226176: cpu_idle: state=4294967295 cpu_id=7
     <idle>-0     [007] d...  4428.226181: cpu_idle: state=4 cpu_id=7
     <idle>-0     [007] d...  4428.227177: cpu_idle: state=4294967295 cpu_id=7
...
     <idle>-0     [007] d...  4428.551640: cpu_idle: state=4 cpu_id=7
     <idle>-0     [007] d...  4428.649239: cpu_idle: state=4294967295 cpu_id=7
kworker/7:2-399   [007] ....  4428.649268: cpu_frequency: state=2800000 cpu_id=7
     <idle>-0     [007] d...  4428.649278: cpu_idle: state=4 cpu_id=7
     <idle>-0     [007] d...  4428.689856: cpu_idle: state=4294967295 cpu_id=7
...
     <idle>-0     [007] d...  4428.799542: cpu_idle: state=4 cpu_id=7
     <idle>-0     [007] d...  4428.801683: cpu_idle: state=4294967295 cpu_id=7
kworker/7:2-399   [007] ....  4428.801748: cpu_frequency: state=1700000 cpu_id=7
     <idle>-0     [007] d...  4428.801761: cpu_idle: state=4 cpu_id=7
     <idle>-0     [007] d...  4428.806545: cpu_idle: state=4294967295 cpu_id=7
...
     <idle>-0     [007] d...  4429.051880: cpu_idle: state=4 cpu_id=7
     <idle>-0     [007] d...  4429.086240: cpu_idle: state=4294967295 cpu_id=7
kworker/7:2-399   [007] ....  4429.086293: cpu_frequency: state=1600000 cpu_id=7

Without the patch the CPU dropped to min frequency after 3.2s
With the patch applied the CPU dropped to min frequency after 0.86s

Signed-off-by: Stratos Karafotis <stratosk@semaphore.gr>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2016-11-16 23:15:56 +01:00
..
acpi-cpufreq.c cpufreq: acpi-cpufreq: use cached frequency mapping when possible 2016-07-21 22:28:32 +02:00
amd_freq_sensitivity.c cpufreq: Reuse new freq-table helpers 2016-07-07 00:14:27 +02:00
arm_big_little_dt.c cpufreq: arm_big_little: use generic OPP functions for {init, free}_opp_table 2016-05-05 01:40:04 +02:00
arm_big_little.c cpufreq: arm_big_little: use generic OPP functions for {init, free}_opp_table 2016-05-05 01:40:04 +02:00
arm_big_little.h cpufreq: arm_big_little: use generic OPP functions for {init, free}_opp_table 2016-05-05 01:40:04 +02:00
at32ap-cpufreq.c cpufreq: at32ap: don't declare local variable as static 2014-04-07 14:31:33 +02:00
blackfin-cpufreq.c blackfin-cpufreq: Mark cpu_set_cclk() as static 2015-12-28 01:51:36 +01:00
brcmstb-avs-cpufreq.c cpufreq: brcmstb-avs-cpufreq: make symbol brcm_avs_cpufreq_attr static 2016-11-11 01:32:53 +01:00
cppc_cpufreq.c cpufreq / CPPC: Add MODULE_DEVICE_TABLE for cppc_cpufreq driver 2016-10-21 15:11:23 +02:00
cpufreq_conservative.c cpufreq: conservative: Decrease frequency faster for deferred updates 2016-11-16 23:15:56 +01:00
cpufreq_governor_attr_set.c cpufreq: governor: Move abstract gov_attr_set code to seperate file 2016-04-02 01:09:01 +02:00
cpufreq_governor.c cpufreq: conservative: Decrease frequency faster for deferred updates 2016-11-16 23:15:56 +01:00
cpufreq_governor.h cpufreq: conservative: Decrease frequency faster for deferred updates 2016-11-16 23:15:56 +01:00
cpufreq_ondemand.c cpufreq: governor: Don't use 'timer' keyword 2016-11-11 01:48:33 +01:00
cpufreq_ondemand.h cpufreq: ondemand: Don't keep a copy of freq_table pointer 2016-06-09 00:58:06 +02:00
cpufreq_performance.c cpufreq: governor: Get rid of governor events 2016-06-02 23:24:15 +02:00
cpufreq_powersave.c cpufreq: governor: Get rid of governor events 2016-06-02 23:24:15 +02:00
cpufreq_stats.c cpufreq: stats: New sysfs attribute for clearing statistics 2016-11-11 01:51:11 +01:00
cpufreq_userspace.c cpufreq: governor: Get rid of governor events 2016-06-02 23:24:15 +02:00
cpufreq-dt-platdev.c cpufreq: pxa: use generic platdev driver for device-tree 2016-11-11 02:08:42 +01:00
cpufreq-dt.c cpufreq: dt: Support governor tunables per policy 2016-09-13 02:39:12 +02:00
cpufreq-dt.h cpufreq: dt: Support governor tunables per policy 2016-09-13 02:39:12 +02:00
cpufreq-nforce2.c cpufreq: Use consistent prefixing via pr_fmt 2016-04-09 01:35:18 +02:00
cpufreq.c Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-10-03 19:43:08 -07:00
cris-artpec3-cpufreq.c cpufreq: create another field .flags in cpufreq_frequency_table 2014-04-07 14:43:50 +02:00
cris-etraxfs-cpufreq.c cpufreq: create another field .flags in cpufreq_frequency_table 2014-04-07 14:43:50 +02:00
davinci-cpufreq.c cpufreq: davinci: Reuse cpufreq_generic_frequency_table_verify() 2016-06-09 00:58:07 +02:00
dbx500-cpufreq.c cpufreq: drop owner assignment from platform_drivers 2014-10-20 16:20:24 +02:00
e_powersaver.c cpufreq: e_powersaver: Use IS_ENABLED() instead of checking for built-in or module 2016-04-27 22:42:34 +02:00
elanfreq.c cpufreq: Use consistent prefixing via pr_fmt 2016-04-09 01:35:18 +02:00
exynos5440-cpufreq.c PM / OPP: Prefix exported opp routines with dev_pm_opp_ 2015-09-15 02:03:16 +02:00
freq_table.c cpufreq: Handle sorted frequency tables more efficiently 2016-07-07 00:13:20 +02:00
gx-suspmod.c cpufreq: gx-suspmod: Fix two typos in two comments 2015-06-15 15:46:15 +02:00
highbank-cpufreq.c Merge branch 'mailbox-for-linus' of git://git.linaro.org/landing-teams/working/fujitsu/integration 2014-10-21 11:21:19 -07:00
ia64-acpi-cpufreq.c cpufreq: Use consistent prefixing via pr_fmt 2016-04-09 01:35:18 +02:00
imx6q-cpufreq.c Merge branch 'pm-opp' 2015-11-02 00:54:37 +01:00
intel_pstate.c cpufreq: intel_pstate: Use CPU load based algorithm for PM_MOBILE 2016-11-14 21:25:23 +01:00
Kconfig Merge branch 'pm-cpufreq-sched' into pm-cpufreq 2016-10-02 01:42:33 +02:00
Kconfig.arm cpufreq: brcmstb-avs-cpufreq: add debugfs support 2016-11-01 06:07:38 +01:00
Kconfig.powerpc cpufreq: qoriq: rename the driver 2015-03-18 22:35:16 +01:00
Kconfig.x86 cpufreq: intel_pstate: Enforce _PPC limits 2016-04-28 01:01:39 +02:00
kirkwood-cpufreq.c cpufreq: kirkwood: add missing \n to end of dev_err messages 2016-09-26 15:10:58 +02:00
longhaul.c Power management material for v4.7-rc1 2016-05-16 19:17:22 -07:00
longhaul.h cpufreq: delete __cpuinit usage from all cpufreq files 2013-07-14 19:36:57 -04:00
longrun.c cpufreq: add new routine cpufreq_verify_within_cpu_limits() 2013-10-16 00:50:23 +02:00
loongson1-cpufreq.c CPUFREQ: Loongson1: Replace goto out with return in ls1x_cpufreq_probe() 2016-05-13 14:02:08 +02:00
loongson2_cpufreq.c cpufreq: Use consistent prefixing via pr_fmt 2016-04-09 01:35:18 +02:00
Makefile cpufreq: brcmstb-avs-cpufreq: AVS CPUfreq driver for Broadcom STB SoCs 2016-11-01 06:07:37 +01:00
maple-cpufreq.c cpufreq: Use consistent prefixing via pr_fmt 2016-04-09 01:35:18 +02:00
mt8173-cpufreq.c Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux 2016-05-26 09:23:43 -07:00
mvebu-cpufreq.c cpufreq: mvebu: fix integer to pointer cast 2016-06-13 23:49:43 +02:00
omap-cpufreq.c remove lots of IS_ERR_VALUE abuses 2016-05-27 15:26:11 -07:00
p4-clockmod.c cpufreq: Use consistent prefixing via pr_fmt 2016-04-09 01:35:18 +02:00
pasemi-cpufreq.c cpufreq: Use cpufreq_for_each_* macros for frequency table iteration 2014-04-30 00:06:21 +02:00
pcc-cpufreq.c Revert "cpufreq: pcc-cpufreq: update default value of cpuinfo_transition_latency" 2016-07-22 23:51:06 +02:00
pmac32-cpufreq.c powerpc updates for 4.7 2016-05-20 10:12:41 -07:00
pmac64-cpufreq.c cpufreq: Use consistent prefixing via pr_fmt 2016-04-09 01:35:18 +02:00
powernow-k6.c cpufreq: Use consistent prefixing via pr_fmt 2016-04-09 01:35:18 +02:00
powernow-k7.c cpufreq: Use consistent prefixing via pr_fmt 2016-04-09 01:35:18 +02:00
powernow-k7.h
powernow-k8.c ACPI / processor: Drop an unused argument of a cleanup routine 2015-07-22 22:11:16 +02:00
powernow-k8.h cpufreq: powernow-k8: Suppress checkpatch warnings 2014-05-17 01:27:01 +02:00
powernv-cpufreq.c cpufreq: powernv: Fix uninitialized lpstate_idx in gpstates_timer_handler() 2016-11-14 21:32:31 +01:00
ppc_cbe_cpufreq_pervasive.c cpufreq: powerpc/platforms/cell: move cpufreq driver to drivers/cpufreq 2013-04-10 13:19:26 +02:00
ppc_cbe_cpufreq_pmi.c cpufreq: Remove cpufreq_frequency_get_table() 2016-06-09 00:58:05 +02:00
ppc_cbe_cpufreq.c cpufreq: Use cpufreq_for_each_* macros for frequency table iteration 2014-04-30 00:06:21 +02:00
ppc_cbe_cpufreq.h cpufreq: e_powersaver: Use IS_ENABLED() instead of checking for built-in or module 2016-04-27 22:42:34 +02:00
pxa2xx-cpufreq.c cpufreq: Use consistent prefixing via pr_fmt 2016-04-09 01:35:18 +02:00
pxa3xx-cpufreq.c cpufreq: Remove cpufreq_generic_exit() 2014-03-12 01:06:00 +01:00
qoriq-cpufreq.c cpufreq: qoriq: Fix cooling device registration issue during suspend 2016-04-25 16:07:02 +02:00
s3c24xx-cpufreq-debugfs.c cpufreq: Use consistent prefixing via pr_fmt 2016-04-09 01:35:18 +02:00
s3c24xx-cpufreq.c cpufreq: Return index from cpufreq_frequency_table_target() 2016-06-09 00:58:06 +02:00
s3c64xx-cpufreq.c cpufreq: Use cpufreq_for_each_* macros for frequency table iteration 2014-04-30 00:06:21 +02:00
s3c2410-cpufreq.c cpufreq: s3c24xx: Remove some dead code 2014-07-19 04:24:59 +09:00
s3c2412-cpufreq.c cpufreq: Use consistent prefixing via pr_fmt 2016-04-09 01:35:18 +02:00
s3c2416-cpufreq.c cpufreq: s3c: remove incorrect __init annotations 2015-02-19 06:36:53 +01:00
s3c2440-cpufreq.c cpufreq: Use consistent prefixing via pr_fmt 2016-04-09 01:35:18 +02:00
s5pv210-cpufreq.c ARM: SoC driver updates for v4.8 2016-08-01 18:36:01 -04:00
sa1100-cpufreq.c cpufreq: Mark ARM drivers with CPUFREQ_NEED_INITIAL_FREQ_CHECK flag 2014-01-06 14:17:25 +01:00
sa1110-cpufreq.c ARM: sa1100: move StrongARM CPU ID checks to cputype.h 2016-08-23 10:25:17 +01:00
sc520_freq.c cpufreq: Use consistent prefixing via pr_fmt 2016-04-09 01:35:18 +02:00
scpi-cpufreq.c cpufreq-SCPI: Delete unnecessary assignment for the field "owner" 2016-08-18 03:42:32 +02:00
sfi-cpufreq.c cpufreq: sfi: use kmemdup rather than duplicating its implementation 2015-09-01 15:51:15 +02:00
sh-cpufreq.c cpufreq: Convert existing drivers to use cpufreq_freq_transition_{begin|end} 2014-03-26 16:41:41 +01:00
sparc-us2e-cpufreq.c cpufreq: add 'freq_table' in struct cpufreq_policy 2014-03-12 01:06:00 +01:00
sparc-us3-cpufreq.c cpufreq: add 'freq_table' in struct cpufreq_policy 2014-03-12 01:06:00 +01:00
spear-cpufreq.c cpufreq: drop owner assignment from platform_drivers 2014-10-20 16:20:24 +02:00
speedstep-centrino.c cpufreq: Use consistent prefixing via pr_fmt 2016-04-09 01:35:18 +02:00
speedstep-ich.c cpufreq: Use consistent prefixing via pr_fmt 2016-04-09 01:35:18 +02:00
speedstep-lib.c cpufreq: Use consistent prefixing via pr_fmt 2016-04-09 01:35:18 +02:00
speedstep-lib.h
speedstep-smi.c cpufreq: Use consistent prefixing via pr_fmt 2016-04-09 01:35:18 +02:00
sti-cpufreq.c cpufreq: st: add missing \n to end of dev_err message 2016-09-26 15:11:42 +02:00
tegra20-cpufreq.c cpufreq: tegra20: remove superfluous CONFIG_PM ifdefs 2015-09-26 03:00:57 +02:00
tegra124-cpufreq.c cpufreq: tegra124: No need of setting platform-data 2016-04-09 01:12:09 +02:00
unicore2-cpufreq.c cpufreq: unicore32: replace IS_ERR and PTR_ERR with PTR_ERR_OR_ZERO 2014-04-21 23:42:27 +02:00
vexpress-spc-cpufreq.c cpufreq: arm_big_little: use generic OPP functions for {init, free}_opp_table 2016-05-05 01:40:04 +02:00