Re: [PATCH RESEND 0/3] PM / devfreq: change load calc in Exynos5422

[Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>]

Hi Chanwoo,

Gentle ping.

Could you please take a look at this patch series?

PS I've taken over this patch series from Kamil.

Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics

On 1/24/20 3:14 PM, Kamil Konieczny wrote:
> There are two problems with exynos-nocp driver. First one is reading
> bytes and cycle counters and comparing them one to one without taking
> into account wcore bus width. Second one is that cycle counter depends
> on DREX DRAM clock, not on wcore clock. The latter problem was exposed
> by commit 6e7674c3c6df5 ("memory: Add DMC driver for Exynos5422"),
> which changes DRAM clock depending on memory read/write pressure and when
> it gets at higher freqency, NoCP cycle counter also increases. Note that
> both of these problems was there before this commit.
> The proposed solution is to use byte counter from NoCP h/w registers
> for current wcore bandwidth calculations and derive max bandwidth from
> current frequency. While at it, change from bytes to kilobytes to avoid
> overflow in later calculations in exynos-bus and devfreq drivers.
> 
> ---
> All tests were run on Odroid XU3 with Exynos 5422 SoC. FullHD monitor was
> connected. Three programs were used for tests: stream for memory stress
> (no wcore activity), dd with eMMC read and modetest (both dd and modetest
> generate data transfers through wcore). First test was performed on idle
> system without running any mentioned programs. In all tests there was
> applied "PM / devfreq: add possibility for delayed work", so data from
> dev_dbg are printed at regular intervals ~60ms.
> 
> Below is first test without current patchset with idle system. Change of
> governor from powersave to performance makes wcore frequency change from
> 88MHz to 532MHz but cycle counter keeps at 4,9*10^6. Additionally,
> byte/cycle ratio also keeps around 310% (15285144 * 100 / 4915741).
> 
> # mkdir /mnt/debug
> # mount -tdebugfs debug /mnt/debug/
> # echo -n 'file exynos-nocp.c +p' > /mnt/debug/dynamic_debug/control
> 
> root@target:~/devfreq# uname -a
> Linux target 5.5.0-rc5-next-20200113-00004-g1374a52f3252 #89 SMP PREEMPT Wed Jan 22 15:14:17 CET 2020 armx
> root@target:~/devfreq# cat /sys/class/devfreq/devfreq2/available_governors
> userspace powersave performance simple_ondemand
> root@target:~/devfreq# echo powersave > /sys/class/devfreq/devfreq2/governor
> root@target:~/devfreq# sleep 1
> root@target:~/devfreq# dmesg|tail
> [  537.340710] devfreq-event event2: nocp@10ca1800 (event: 15110160/4980473)
> [  537.340749] devfreq-event event3: nocp@10ca1c00 (event: 0/4910429)
> [  537.400676] devfreq-event event0: nocp@10ca1000 (event: 15386976/4936165)
> [  537.400731] devfreq-event event1: nocp@10ca1400 (event: 0/4934961)
> [  537.400783] devfreq-event event2: nocp@10ca1800 (event: 15167708/4933305)
> [  537.400834] devfreq-event event3: nocp@10ca1c00 (event: 0/4931505)
> [  537.460635] devfreq-event event0: nocp@10ca1000 (event: 15523208/4924365)
> [  537.460678] devfreq-event event1: nocp@10ca1400 (event: 0/4920169)
> [  537.460717] devfreq-event event2: nocp@10ca1800 (event: 15285144/4915741)
> [  537.460755] devfreq-event event3: nocp@10ca1c00 (event: 0/4911197)
> root@target:~/devfreq# cat /sys/class/devfreq/devfreq2/trans_stat
>      From  :   To
>            :  88700000 133000000 177400000 266000000 532000000   time(ms)
> *  88700000:         0         0         0         0         1     77030
>   133000000:         0         0         0         0         0         0
>   177400000:         0         0         0         0         0         0
>   266000000:         0         0         0         0         0         0
>   532000000:         1         0         0         0         0    513100
> Total transition : 2
> 
> root@target:~/devfreq# echo performance > /sys/class/devfreq/devfreq2/governor
> root@target:~/devfreq# sleep 1
> root@target:~/devfreq# dmesg|tail
> [  537.340710] devfreq-event event2: nocp@10ca1800 (event: 15110160/4980473)
> [  537.340749] devfreq-event event3: nocp@10ca1c00 (event: 0/4910429)
> [  537.400676] devfreq-event event0: nocp@10ca1000 (event: 15386976/4936165)
> [  537.400731] devfreq-event event1: nocp@10ca1400 (event: 0/4934961)
> [  537.400783] devfreq-event event2: nocp@10ca1800 (event: 15167708/4933305)
> [  537.400834] devfreq-event event3: nocp@10ca1c00 (event: 0/4931505)
> [  537.460635] devfreq-event event0: nocp@10ca1000 (event: 15523208/4924365)
> [  537.460678] devfreq-event event1: nocp@10ca1400 (event: 0/4920169)
> [  537.460717] devfreq-event event2: nocp@10ca1800 (event: 15285144/4915741)
> [  537.460755] devfreq-event event3: nocp@10ca1c00 (event: 0/4911197)
> root@target:~/devfreq# cat /sys/class/devfreq/devfreq2/trans_stat 
>      From  :   To
>            :  88700000 133000000 177400000 266000000 532000000   time(ms)
>    88700000:         0         0         0         0         2    398100
>   133000000:         0         0         0         0         0         0
>   177400000:         0         0         0         0         0         0
>   266000000:         0         0         0         0         0         0
> * 532000000:         1         0         0         0         0    524440
> Total transition : 3
> 
> ---
> Below are logs from memory stress stream running on linux next-20200113
> and applied patchset "PM / devfreq: add possibility for delayed work"
> with config option DEVFREQ_DELAYED_TIMER set on but without current
> patchset.
> 
> After end of stream program, cycle counter drops gradually from 24*10^6
> to 22*10^6, 18*10^6, 16*10^6, 12*10^6, 8*10^6. These corresponds to DRAM
> frequences, while bytes counts stays around 15*10^6, with debug prints in
> 60ms periods. Wcore frequency keeps at 532MHz. It shows that NoCP cycle
> counters counts DREX cycles.
> 
> root@target:~# cat /sys/class/devfreq/devfreq0/name
> 10c20000.memory-controller
> root@target:~# cat /sys/class/devfreq/devfreq0/available_frequencies
> 165000000 206000000 275000000 413000000 543000000 633000000 728000000 825000000
> 
> root@target:~/devfreq# cat /sys/class/devfreq/devfreq2/name
> soc:bus_wcore
> root@target:~/devfreq# cat /sys/class/devfreq/devfreq2/trans_stat
>      From  :   To
>            :  88700000 133000000 177400000 266000000 532000000   time(ms)
>    88700000:         0         0         0         0         1     19600
>   133000000:         0         0         0         0         0         0
>   177400000:         0         0         0         0         0         0
>   266000000:         0         0         0         0         0         0
> * 532000000:         0         0         0         0         0    276830
> Total transition : 1
> 
> [3]+  Done      ../stream_gnueabi
> root@target:~/devfreq# dmesg|tail
> [  408.795693] devfreq-event event2: nocp@10ca1800 (event: 15439456/24502701)
> [  408.795756] devfreq-event event3: nocp@10ca1c00 (event: 0/24462297)
> [  408.855906] devfreq-event event0: nocp@10ca1000 (event: 15676712/24742161)
> [  408.856058] devfreq-event event1: nocp@10ca1400 (event: 0/24779693)
> [  408.856200] devfreq-event event2: nocp@10ca1800 (event: 15412224/24806561)
> [  408.856339] devfreq-event event3: nocp@10ca1c00 (event: 0/24832709)
> [  408.915511] devfreq-event event0: nocp@10ca1000 (event: 15529520/24311941)
> [  408.915543] devfreq-event event1: nocp@10ca1400 (event: 0/24313465)
> [  408.915572] devfreq-event event2: nocp@10ca1800 (event: 15126880/24182937)
> [  408.915602] devfreq-event event3: nocp@10ca1c00 (event: 0/24182621)
> root@target:~/devfreq# dmesg|tail
> [  409.465639] devfreq-event event2: nocp@10ca1800 (event: 15399964/22002313)
> [  409.465690] devfreq-event event3: nocp@10ca1c00 (event: 0/21989117)
> [  409.525424] devfreq-event event0: nocp@10ca1000 (event: 15671172/18876933)
> [  409.525451] devfreq-event event1: nocp@10ca1400 (event: 0/18863021)
> [  409.525476] devfreq-event event2: nocp@10ca1800 (event: 15389640/18848269)
> [  409.525501] devfreq-event event3: nocp@10ca1c00 (event: 0/18833213)
> [  409.585407] devfreq-event event0: nocp@10ca1000 (event: 15615780/18943765)
> [  409.585430] devfreq-event event1: nocp@10ca1400 (event: 0/18939237)
> [  409.585451] devfreq-event event2: nocp@10ca1800 (event: 15311112/18933717)
> [  409.585473] devfreq-event event3: nocp@10ca1c00 (event: 0/18928025)
> root@target:~/devfreq# dmesg|tail
> [  410.195489] devfreq-event event2: nocp@10ca1800 (event: 15456592/18901525)
> [  410.195513] devfreq-event event3: nocp@10ca1c00 (event: 0/18890417)
> [  410.255525] devfreq-event event0: nocp@10ca1000 (event: 15641556/18975417)
> [  410.255571] devfreq-event event1: nocp@10ca1400 (event: 0/18979225)
> [  410.255616] devfreq-event event2: nocp@10ca1800 (event: 15350596/18981701)
> [  410.255659] devfreq-event event3: nocp@10ca1c00 (event: 0/18983885)
> [  410.315492] devfreq-event event0: nocp@10ca1000 (event: 15722964/18910573)
> [  410.315523] devfreq-event event1: nocp@10ca1400 (event: 0/18900445)
> [  410.315552] devfreq-event event2: nocp@10ca1800 (event: 15392616/18888593)
> [  410.315582] devfreq-event event3: nocp@10ca1c00 (event: 0/18877473)
> root@target:~/devfreq# dmesg|tail
> [  410.915913] devfreq-event event2: nocp@10ca1800 (event: 15284056/16183805)
> [  410.916053] devfreq-event event3: nocp@10ca1c00 (event: 0/16191953)
> [  410.975616] devfreq-event event0: nocp@10ca1000 (event: 15643540/16119365)
> [  410.975678] devfreq-event event1: nocp@10ca1400 (event: 0/16092877)
> [  410.975731] devfreq-event event2: nocp@10ca1800 (event: 15310112/16070749)
> [  410.975818] devfreq-event event3: nocp@10ca1c00 (event: 0/16058261)
> [  411.035711] devfreq-event event0: nocp@10ca1000 (event: 15568372/16212845)
> [  411.035736] devfreq-event event1: nocp@10ca1400 (event: 0/16170909)
> [  411.035759] devfreq-event event2: nocp@10ca1800 (event: 15207864/16139825)
> [  411.035781] devfreq-event event3: nocp@10ca1c00 (event: 0/16100285)
> root@target:~/devfreq# dmesg|tail
> [  411.695736] devfreq-event event2: nocp@10ca1800 (event: 15307112/12243577)
> [  411.695799] devfreq-event event3: nocp@10ca1c00 (event: 0/12215505)
> [  411.755546] devfreq-event event0: nocp@10ca1000 (event: 15492580/12310437)
> [  411.755594] devfreq-event event1: nocp@10ca1400 (event: 0/12302877)
> [  411.755628] devfreq-event event2: nocp@10ca1800 (event: 15195176/12290805)
> [  411.755662] devfreq-event event3: nocp@10ca1c00 (event: 0/12277981)
> [  411.815659] devfreq-event event0: nocp@10ca1000 (event: 15663508/12364637)
> [  411.815742] devfreq-event event1: nocp@10ca1400 (event: 0/12372049)
> [  411.815819] devfreq-event event2: nocp@10ca1800 (event: 15363208/12377025)
> [  411.815895] devfreq-event event3: nocp@10ca1c00 (event: 0/12382285)
> root@target:~/devfreq# dmesg|tail
> [  412.475472] devfreq-event event2: nocp@10ca1800 (event: 15336068/8174697)
> [  412.475500] devfreq-event event3: nocp@10ca1c00 (event: 0/8166397)
> [  412.535552] devfreq-event event0: nocp@10ca1000 (event: 15559072/8245049)
> [  412.535606] devfreq-event event1: nocp@10ca1400 (event: 0/8246885)
> [  412.535644] devfreq-event event2: nocp@10ca1800 (event: 15300092/8245173)
> [  412.535682] devfreq-event event3: nocp@10ca1c00 (event: 0/8243145)
> [  412.595670] devfreq-event event0: nocp@10ca1000 (event: 15707976/8233633)
> [  412.595757] devfreq-event event1: nocp@10ca1400 (event: 0/8238765)
> [  412.595836] devfreq-event event2: nocp@10ca1800 (event: 15463796/8241561)
> [  412.595916] devfreq-event event3: nocp@10ca1c00 (event: 0/8244441)
> root@target:~/devfreq#
> 
> ---
> Logs from dd program without patchset:
> 
> root@target:~/devfreq# cat /sys/class/devfreq/devfreq2/trans_stat
>      From  :   To
>            :  88700000 133000000 177400000 266000000 532000000   time(ms)
>    88700000:         0         0         0         0         1     19600
>   133000000:         0         0         0         0         0         0
>   177400000:         0         0         0         0         0         0
>   266000000:         0         0         0         0         0         0
> * 532000000:         0         0         0         0         0    636660
> Total transition : 1
> 
> uname -a
> Linux target 5.5.0-rc5-next-20200113-00004-g1374a52f3252 #89 SMP PREEMPT Wed Jan 22 15:14:17 CET 2020 armv7l GNU/Linux
> root@target:~# cat /sys/class/devfreq/devfreq0/available_frequencies
> 165000000 206000000 275000000 413000000 543000000 633000000 728000000 825000000
> root@target:~# cat /sys/class/devfreq/devfreq0/governor
> simple_ondemand
> root@target:~# cat /sys/class/devfreq/devfreq0/name
> 10c20000.memory-controller
> root@target:~# cat /sys/class/devfreq/devfreq2/name
> soc:bus_wcore
> root@target:~# cat /sys/class/devfreq/devfreq2/governor
> simple_ondemand
> root@target:~# cat /sys/class/devfreq/devfreq2/available_governors
> userspace powersave performance simple_ondemand
> root@target:~# cat /sys/class/devfreq/devfreq2/trans_stat
>      From  :   To
>            :  88700000 133000000 177400000 266000000 532000000   time(ms)
>    88700000:         0         0         0         0         1     21890
>   133000000:         0         0         0         0         0         0
>   177400000:         0         0         0         0         0         0
>   266000000:         0         0         0         0         0         0
> * 532000000:         0         0         0         0         0    148180
> Total transition : 1
> root@target:~# dd if=/dev/mmcblk0p5 of=/dev/null &
> root@target:~/devfreq# dmesg|tail
> [  203.960365] devfreq-event event2: nocp@10ca1800 (event: 16527152/4949925)
> [  203.960404] devfreq-event event3: nocp@10ca1c00 (event: 0/4947305)
> [  204.020027] devfreq-event event0: nocp@10ca1000 (event: 16682948/4909245)
> [  204.020082] devfreq-event event1: nocp@10ca1400 (event: 0/4910441)
> [  204.020228] devfreq-event event2: nocp@10ca1800 (event: 16489972/4916613)
> [  204.020272] devfreq-event event3: nocp@10ca1c00 (event: 0/4914745)
> [  204.080072] devfreq-event event0: nocp@10ca1000 (event: 16478288/4924185)
> [  204.080132] devfreq-event event1: nocp@10ca1400 (event: 0/4925193)
> [  204.080182] devfreq-event event2: nocp@10ca1800 (event: 16264096/4923477)
> [  204.080230] devfreq-event event3: nocp@10ca1c00 (event: 0/4921769)
> root@target:~/devfreq# dmesg|tail
> [  246.059861] devfreq-event event2: nocp@10ca1800 (event: 20070832/28829017)
> [  246.059881] devfreq-event event3: nocp@10ca1c00 (event: 0/28824933)
> [  246.129815] devfreq-event event0: nocp@10ca1000 (event: 20427304/28827105)
> [  246.129841] devfreq-event event1: nocp@10ca1400 (event: 0/28829773)
> [  246.129861] devfreq-event event2: nocp@10ca1800 (event: 20069316/28826285)
> [  246.129883] devfreq-event event3: nocp@10ca1c00 (event: 0/28822925)
> [  246.189805] devfreq-event event0: nocp@10ca1000 (event: 17431936/24698601)
> [  246.189827] devfreq-event event1: nocp@10ca1400 (event: 0/24698561)
> [  246.189847] devfreq-event event2: nocp@10ca1800 (event: 17122664/24694697)
> [  246.189866] devfreq-event event3: nocp@10ca1c00 (event: 0/24690477)
> root@target:~/devfreq# dmesg|tail
> [  305.689792] devfreq-event event2: nocp@10ca1800 (event: 19897292/28827045)
> [  305.689811] devfreq-event event3: nocp@10ca1c00 (event: 0/28823497)
> [  305.759748] devfreq-event event0: nocp@10ca1000 (event: 20428188/28829305)
> [  305.759772] devfreq-event event1: nocp@10ca1400 (event: 0/28829941)
> [  305.759792] devfreq-event event2: nocp@10ca1800 (event: 20069112/28826421)
> [  305.759811] devfreq-event event3: nocp@10ca1c00 (event: 0/28822505)
> [  305.829759] devfreq-event event0: nocp@10ca1000 (event: 20431388/28833721)
> [  305.829784] devfreq-event event1: nocp@10ca1400 (event: 0/28835077)
> [  305.829805] devfreq-event event2: nocp@10ca1800 (event: 20072332/28831797)
> [  305.829826] devfreq-event event3: nocp@10ca1c00 (event: 0/28828669)
> root@target:~/devfreq# 22501344+0 records in
> 22501344+0 records out
> 11520688128 bytes (12 GB, 11 GiB) copied, 202.816 s, 56.8 MB/s
> 
> [1]+  Done                    dd if=/dev/mmcblk0p5 of=/dev/null  (wd: ~)
> (wd now: ~/devfreq)
> root@target:~/devfreq# dmesg|tail
> [  706.099607] devfreq-event event2: nocp@10ca1800 (event: 15308600/4922945)
> [  706.099639] devfreq-event event3: nocp@10ca1c00 (event: 0/4919705)
> [  706.159726] devfreq-event event0: nocp@10ca1000 (event: 15430964/4950105)
> [  706.159782] devfreq-event event1: nocp@10ca1400 (event: 0/4949257)
> [  706.159825] devfreq-event event2: nocp@10ca1800 (event: 15213116/4947661)
> [  706.159878] devfreq-event event3: nocp@10ca1c00 (event: 0/4946217)
> [  706.229632] devfreq-event event0: nocp@10ca1000 (event: 18023796/5745053)
> [  706.229674] devfreq-event event1: nocp@10ca1400 (event: 0/5741853)
> [  706.229714] devfreq-event event2: nocp@10ca1800 (event: 17752680/5737085)
> [  706.229753] devfreq-event event3: nocp@10ca1c00 (event: 0/5732637)
> root@target:~/devfreq# cat /sys/class/devfreq/devfreq2/trans_stat
>      From  :   To
>            :  88700000 133000000 177400000 266000000 532000000   time(ms)
>    88700000:         0         0         0         0         1     21890
>   133000000:         0         0         0         0         0         0
>   177400000:         0         0         0         0         0         0
>   266000000:         0         0         0         0         0         0
> * 532000000:         0         0         0         0         0    682170
> Total transition : 1
> ---
> Logs from modetest program without patchset:
> 
> root@target:~/devfreq# ../modetest -s 43:1920x1080 -P41:1920x1080 &
> [1] 768
> root@target:~/devfreq# trying to open device 'i915'...failed
> trying to open device 'amdgpu'...failed
> trying to open device 'radeon'...failed
> trying to open device 'nouveau'...failed
> trying to open device 'vmwgfx'...failed
> trying to open device 'omapdrm'...failed
> trying to open device 'exynos'...done
> setting mode 1920x1080-60Hz@XR24 on connectors 43, crtc 41
> testing 1920x1080@XR24 overlay plane 36
> ^C
> 
> [1]+  Stopped                 ../modetest -s 43:1920x1080 -P41:1920x1080
> root@target:~/devfreq# dmesg|tail
> [  820.619367] devfreq-event event2: nocp@10ca1800 (event: 30328644/24548753)
> [  820.619409] devfreq-event event3: nocp@10ca1c00 (event: 0/24524329)
> [  820.679405] devfreq-event event0: nocp@10ca1000 (event: 30494152/24711057)
> [  820.679449] devfreq-event event1: nocp@10ca1400 (event: 0/24771605)
> [  820.679616] devfreq-event event2: nocp@10ca1800 (event: 30235156/24749273)
> [  820.679673] devfreq-event event3: nocp@10ca1c00 (event: 0/24749361)
> [  820.739321] devfreq-event event0: nocp@10ca1000 (event: 30302840/24562317)
> [  820.739347] devfreq-event event1: nocp@10ca1400 (event: 0/24538725)
> [  820.739375] devfreq-event event2: nocp@10ca1800 (event: 29936448/24513753)
> [  820.739399] devfreq-event event3: nocp@10ca1c00 (event: 0/24490281)
> root@target:~/devfreq# dmesg|tail
> [  839.159763] devfreq-event event2: nocp@10ca1800 (event: 30353968/24842849)
> [  839.159823] devfreq-event event3: nocp@10ca1c00 (event: 0/24865157)
> [  839.219307] devfreq-event event0: nocp@10ca1000 (event: 30557856/24492825)
> [  839.219339] devfreq-event event1: nocp@10ca1400 (event: 0/24471425)
> [  839.219369] devfreq-event event2: nocp@10ca1800 (event: 30199176/24448969)
> [  839.219398] devfreq-event event3: nocp@10ca1c00 (event: 0/24426201)
> [  839.279298] devfreq-event event0: nocp@10ca1000 (event: 30428216/24658369)
> [  839.279328] devfreq-event event1: nocp@10ca1400 (event: 0/24653145)
> [  839.279356] devfreq-event event2: nocp@10ca1800 (event: 30068856/24616381)
> [  839.279383] devfreq-event event3: nocp@10ca1c00 (event: 0/24592713)
> root@target:~/devfreq# fg %1
> ../modetest -s 43:1920x1080 -P41:1920x1080
> 
> root@target:~/devfreq# dmesg|tail
> [  849.109306] devfreq-event event2: nocp@10ca1800 (event: 15005132/18570965)
> [  849.109334] devfreq-event event3: nocp@10ca1c00 (event: 0/18536625)
> [  849.169188] devfreq-event event0: nocp@10ca1000 (event: 15774388/18925857)
> [  849.169211] devfreq-event event1: nocp@10ca1400 (event: 0/18919609)
> [  849.169232] devfreq-event event2: nocp@10ca1800 (event: 15467076/18912721)
> [  849.169253] devfreq-event event3: nocp@10ca1c00 (event: 0/18905821)
> [  849.229241] devfreq-event event0: nocp@10ca1000 (event: 15638480/18969689)
> [  849.229278] devfreq-event event1: nocp@10ca1400 (event: 0/18971713)
> [  849.229310] devfreq-event event2: nocp@10ca1800 (event: 15342996/18971197)
> [  849.229343] devfreq-event event3: nocp@10ca1c00 (event: 0/18971037)
> root@target:~/devfreq# dmesg|tail
> [  852.689344] devfreq-event event2: nocp@10ca1800 (event: 15166292/6141665)
> [  852.689386] devfreq-event event3: nocp@10ca1c00 (event: 0/6139661)
> [  852.749342] devfreq-event event0: nocp@10ca1000 (event: 15636760/6165141)
> [  852.749401] devfreq-event event1: nocp@10ca1400 (event: 0/6164021)
> [  852.749458] devfreq-event event2: nocp@10ca1800 (event: 15390668/6162173)
> [  852.749510] devfreq-event event3: nocp@10ca1c00 (event: 0/6225561)
> [  852.809320] devfreq-event event0: nocp@10ca1000 (event: 15417248/6147685)
> [  852.809396] devfreq-event event1: nocp@10ca1400 (event: 0/6146713)
> [  852.809467] devfreq-event event2: nocp@10ca1800 (event: 15171716/6144453)
> [  852.809538] devfreq-event event3: nocp@10ca1c00 (event: 0/6141765)
> root@target:~/devfreq# dmesg|tail
> [  856.079392] devfreq-event event2: nocp@10ca1800 (event: 14908768/4852089)
> [  856.079437] devfreq-event event3: nocp@10ca1c00 (event: 0/4845833)
> [  856.139479] devfreq-event event0: nocp@10ca1000 (event: 15412824/4944089)
> [  856.139547] devfreq-event event1: nocp@10ca1400 (event: 0/4943049)
> [  856.139620] devfreq-event event2: nocp@10ca1800 (event: 15193496/4941817)
> [  856.139694] devfreq-event event3: nocp@10ca1c00 (event: 0/4940997)
> [  856.199282] devfreq-event event0: nocp@10ca1000 (event: 15449800/4903065)
> [  856.199329] devfreq-event event1: nocp@10ca1400 (event: 0/4896677)
> [  856.199372] devfreq-event event2: nocp@10ca1800 (event: 15199216/4889889)
> [  856.199408] devfreq-event event3: nocp@10ca1c00 (event: 0/4883005)
> root@target:~/devfreq# dmesg|tail
> [  860.859354] devfreq-event event2: nocp@10ca1800 (event: 15083684/4906997)
> [  860.859397] devfreq-event event3: nocp@10ca1c00 (event: 0/4901577)
> [  860.919310] devfreq-event event0: nocp@10ca1000 (event: 15551720/4933873)
> [  860.919380] devfreq-event event1: nocp@10ca1400 (event: 0/4933309)
> [  860.919447] devfreq-event event2: nocp@10ca1800 (event: 15336016/4932153)
> [  860.919513] devfreq-event event3: nocp@10ca1c00 (event: 0/4930965)
> [  860.979224] devfreq-event event0: nocp@10ca1000 (event: 15315932/4914741)
> [  860.979272] devfreq-event event1: nocp@10ca1400 (event: 0/4907993)
> [  860.979317] devfreq-event event2: nocp@10ca1800 (event: 15063744/4901321)
> [  860.979360] devfreq-event event3: nocp@10ca1c00 (event: 0/4894661)
> root@target:~/devfreq# cat /sys/class/devfreq/devfreq2/trans_stat
>      From  :   To
>            :  88700000 133000000 177400000 266000000 532000000   time(ms)
>    88700000:         0         0         0         0         1     21890
>   133000000:         0         0         0         0         0         0
>   177400000:         0         0         0         0         0         0
>   266000000:         0         0         0         0         0         0
> * 532000000:         0         0         0         0         0    873990
> Total transition : 1
> 
> ---
> Logs after applied both "PM / devfreq: add possibility for delayed work"
> and current patchset, tested with three programs: (a) stream, (b) dd from
> eMMC memory and (c) modetest.
> 
> (a) stream test (no wcore freq change):
> 
> root@target:~/devfreq# . nocp_debug 
> exit code: 0
> root@target:~/devfreq# dmesg |tail
> [  193.344624] devfreq-event event2: nocp@10ca1800 (event: 252318/709600) 60ms 35% 0x00e70110
> [  193.344657] devfreq-event event3: nocp@10ca1c00 (event: 0/709600) 60ms 0% 0x00000000
> [  193.404790] devfreq-event event0: nocp@10ca1000 (event: 260404/709600) 60ms 36% 0x00ee6854
> [  193.404880] devfreq-event event1: nocp@10ca1400 (event: 0/709600) 60ms 0% 0x00000000
> [  193.404956] devfreq-event event2: nocp@10ca1800 (event: 256331/709600) 60ms 36% 0x00eaad94
> [  193.405034] devfreq-event event3: nocp@10ca1c00 (event: 0/709600) 60ms 0% 0x00000000
> [  193.464521] devfreq-event event0: nocp@10ca1000 (event: 257190/709600) 60ms 36% 0x00eb76f4
> [  193.464556] devfreq-event event1: nocp@10ca1400 (event: 0/709600) 60ms 0% 0x00000000
> [  193.464588] devfreq-event event2: nocp@10ca1800 (event: 252946/709600) 60ms 35% 0x00e79468
> [  193.464618] devfreq-event event3: nocp@10ca1c00 (event: 0/709600) 60ms 0% 0x00000000
> root@target:~/devfreq# cat /sys/class/devfreq/devfreq2/trans_stat
>      From  :   To
>            :  88700000 133000000 177400000 266000000 532000000   time(ms)
>    88700000:         0         0         0         0         1     20430
>   133000000:         0         0         0         0         0         0
> * 177400000:         0         0         0         0         2    172220
>   266000000:         0         0         1         0         0       180
>   532000000:         0         0         2         1         0       220
> Total transition : 7
> 
> root@target:~/devfreq# ../stream_gnueabi &
> [1] 733
> root@target:~/devfreq# -------------------------------------------------------------
> STREAM version $Revision: 5.10 $
> -------------------------------------------------------------
> This system uses 8 bytes per array element.
> -------------------------------------------------------------
> Array size = 10000000 (elements), Offset = 0 (elements)
> Memory per array = 76.3 MiB (= 0.1 GiB).
> Total memory required = 228.9 MiB (= 0.2 GiB).
> Each kernel will be executed 10 times.
>  The *best* time for each kernel (excluding the first iteration)
>  will be used to compute the reported bandwidth.
> 
> -------------------------------------------------------------
> Your clock granularity/precision appears to be 5 microseconds.
> Each test below will take on the order of 142436 microseconds.
>    (= 28487 clock ticks)
> Increase the size of the arrays if this shows that
> you are not getting at least 20 clock ticks per test.
> -------------------------------------------------------------
> WARNING -- The above is only a rough guideline.
> For best results, please be sure you know the
> precision of your system timer.
> -------------------------------------------------------------
> 
> root@target:~/devfreq# dmesg |tail
> [  226.928746] devfreq-event event2: nocp@10ca1800 (event: 257500/709600) 60ms 36% 0x00ebbfc4
> [  226.928766] devfreq-event event3: nocp@10ca1c00 (event: 0/709600) 60ms 0% 0x00000000
> [  226.998460] devfreq-event event0: nocp@10ca1000 (event: 261658/709600) 70ms 36% 0x01177b24
> [  226.998486] devfreq-event event1: nocp@10ca1400 (event: 0/709600) 70ms 0% 0x00000000
> [  226.998507] devfreq-event event2: nocp@10ca1800 (event: 256611/709600) 70ms 36% 0x01121734
> [  226.998527] devfreq-event event3: nocp@10ca1c00 (event: 0/709600) 70ms 0% 0x00000000
> [  227.058393] devfreq-event event0: nocp@10ca1000 (event: 260563/709600) 60ms 36% 0x00ee8da4
> [  227.058414] devfreq-event event1: nocp@10ca1400 (event: 0/709600) 60ms 0% 0x00000000
> [  227.058433] devfreq-event event2: nocp@10ca1800 (event: 255456/709600) 60ms 36% 0x00e9e0ac
> [  227.058450] devfreq-event event3: nocp@10ca1c00 (event: 0/709600) 60ms 0% 0x00000000
> root@target:~/devfreq# Function    Best Rate MB/s  Avg time     Min time     Max time
> Copy:            4797.5     0.041159     0.033351     0.051780
> Scale:            825.3     0.205380     0.193868     0.227955
> Add:             1143.5     0.218550     0.209885     0.234103
> Triad:            670.2     0.374949     0.358115     0.407750
> -------------------------------------------------------------
> Solution Validates: avg error less than 1.000000e-13 on all three arrays
> -------------------------------------------------------------
> 
> [1]+  Done                    ../stream_gnueabi
> root@target:~/devfreq# dmesg |tail
> [  237.444983] devfreq-event event2: nocp@10ca1800 (event: 249059/709600) 60ms 35% 0x00e40568
> [  237.445018] devfreq-event event3: nocp@10ca1c00 (event: 0/709600) 60ms 0% 0x00000000
> [  237.504918] devfreq-event event0: nocp@10ca1000 (event: 258668/709600) 60ms 36% 0x00ecd184
> [  237.504953] devfreq-event event1: nocp@10ca1400 (event: 0/709600) 60ms 0% 0x00000000
> [  237.504994] devfreq-event event2: nocp@10ca1800 (event: 254219/709600) 60ms 35% 0x00e8bec0
> [  237.505029] devfreq-event event3: nocp@10ca1c00 (event: 0/709600) 60ms 0% 0x00000000
> [  237.564841] devfreq-event event0: nocp@10ca1000 (event: 259859/709600) 60ms 36% 0x00ede874
> [  237.564872] devfreq-event event1: nocp@10ca1400 (event: 0/709600) 60ms 0% 0x00000000
> [  237.564898] devfreq-event event2: nocp@10ca1800 (event: 256008/709600) 60ms 36% 0x00ea61f0
> [  237.564923] devfreq-event event3: nocp@10ca1c00 (event: 0/709600) 60ms 0% 0x00000000
> root@target:~/devfreq# cat /sys/class/devfreq/devfreq2/trans_stat
>      From  :   To
>            :  88700000 133000000 177400000 266000000 532000000   time(ms)
>    88700000:         0         0         0         0         1     20430
>   133000000:         0         0         0         0         0         0
> * 177400000:         0         0         0         0         2    214770
>   266000000:         0         0         1         0         0       180
>   532000000:         0         0         2         1         0       220
> Total transition : 7
> 
> (b) dd test (wcore enters 2nd freq 266MHz):
> 
> dmesg |tail
> [ 1241.311174] devfreq-event event2: nocp@10ca1800 (event: 252036/709600) 60ms 35% 0x00e6bf08
> [ 1241.311206] devfreq-event event3: nocp@10ca1c00 (event: 0/709600) 60ms 0% 0x00000000
> [ 1241.371136] devfreq-event event0: nocp@10ca1000 (event: 259618/709600) 60ms 36% 0x00edaff8
> [ 1241.371168] devfreq-event event1: nocp@10ca1400 (event: 0/709600) 60ms 0% 0x00000000
> [ 1241.371198] devfreq-event event2: nocp@10ca1800 (event: 255889/709600) 60ms 36% 0x00ea460c
> [ 1241.371229] devfreq-event event3: nocp@10ca1c00 (event: 0/709600) 60ms 0% 0x00000000
> [ 1241.431204] devfreq-event event0: nocp@10ca1000 (event: 256887/709600) 60ms 36% 0x00eb2fe4
> [ 1241.431240] devfreq-event event1: nocp@10ca1400 (event: 0/709600) 60ms 0% 0x00000000
> [ 1241.431275] devfreq-event event2: nocp@10ca1800 (event: 253194/709600) 60ms 35% 0x00e7ce8c
> [ 1241.431308] devfreq-event event3: nocp@10ca1c00 (event: 0/709600) 60ms 0% 0x00000000
> root@target:~/devfreq# cat /sys/class/devfreq/devfreq2/trans_stat 
>      From  :   To
>            :  88700000 133000000 177400000 266000000 532000000   time(ms)
>    88700000:         0         0         0         0         1     19630
>   133000000:         0         0         0         0         1        90
> * 177400000:         0         0         0         0         4    997330
>   266000000:         0         0         3         0         0    194010
>   532000000:         0         1         2         3         0     27930
> Total transition : 15
> root@target:~/devfreq# dd if=/dev/mmcblk0p5 of=/dev/null &
> [1] 788
> root@target:~/devfreq# dmesg |tail
> [ 1266.461371] devfreq-event event2: nocp@10ca1800 (event: 273550/709600) 60ms 38% 0x00fa7170
> [ 1266.461400] devfreq-event event3: nocp@10ca1c00 (event: 0/709600) 60ms 0% 0x00000000
> [ 1266.531256] devfreq-event event0: nocp@10ca1000 (event: 278666/709600) 70ms 39% 0x0129a5e8
> [ 1266.531303] devfreq-event event1: nocp@10ca1400 (event: 0/709600) 70ms 0% 0x00000000
> [ 1266.531339] devfreq-event event2: nocp@10ca1800 (event: 275211/709600) 70ms 38% 0x0125f530
> [ 1266.531372] devfreq-event event3: nocp@10ca1c00 (event: 0/709600) 70ms 0% 0x00000000
> [ 1266.601314] devfreq-event event0: nocp@10ca1000 (event: 274246/709600) 70ms 38% 0x0124ed54
> [ 1266.601375] devfreq-event event1: nocp@10ca1400 (event: 0/709600) 70ms 0% 0x00000000
> [ 1266.601417] devfreq-event event2: nocp@10ca1800 (event: 270819/709600) 70ms 38% 0x0121444c
> [ 1266.601456] devfreq-event event3: nocp@10ca1c00 (event: 0/709600) 70ms 0% 0x00000000
> root@target:~/devfreq# cat /sys/class/devfreq/devfreq2/trans_stat
>      From  :   To
>            :  88700000 133000000 177400000 266000000 532000000   time(ms)
>    88700000:         0         0         0         0         1     19630
>   133000000:         0         0         0         0         1        90
>   177400000:         0         0         0         0         5   1020500
> * 266000000:         0         0         3         0         0    200780
>   532000000:         0         1         2         4         0     28000
> Total transition : 17
> root@target:~/devfreq# dmesg|tail
> [ 1297.511213] devfreq-event event2: nocp@10ca1800 (event: 284350/1064000) 60ms 26% 0x010454b0
> [ 1297.511228] devfreq-event event3: nocp@10ca1c00 (event: 0/1064000) 60ms 0% 0x00000000
> [ 1297.571207] devfreq-event event0: nocp@10ca1000 (event: 292658/1064000) 60ms 27% 0x010befd8
> [ 1297.571226] devfreq-event event1: nocp@10ca1400 (event: 0/1064000) 60ms 0% 0x00000000
> [ 1297.571242] devfreq-event event2: nocp@10ca1800 (event: 287516/1064000) 60ms 27% 0x01073a94
> [ 1297.571258] devfreq-event event3: nocp@10ca1c00 (event: 0/1064000) 60ms 0% 0x00000000
> [ 1297.631178] devfreq-event event0: nocp@10ca1000 (event: 288329/1064000) 60ms 27% 0x0107f944
> [ 1297.631199] devfreq-event event1: nocp@10ca1400 (event: 0/1064000) 60ms 0% 0x00000000
> [ 1297.631221] devfreq-event event2: nocp@10ca1800 (event: 283311/1064000) 60ms 26% 0x01036108
> [ 1297.631238] devfreq-event event3: nocp@10ca1c00 (event: 0/1064000) 60ms 0% 0x00000000
> root@target:~/devfreq# cat /sys/class/devfreq/devfreq2/trans_stat 
>      From  :   To
>            :  88700000 133000000 177400000 266000000 532000000   time(ms)
>    88700000:         0         0         0         0         1     19630
>   133000000:         0         0         0         0         1        90
>   177400000:         0         0         0         0         5   1020500
> * 266000000:         0         0         3         0         0    268040
>   532000000:         0         1         2         4         0     28000
> Total transition : 17
> root@target:~/devfreq# cat /sys/class/devfreq/devfreq2/trans_stat dmesg|tail
> [ 1345.621291] devfreq-event event2: nocp@10ca1800 (event: 287629/1064000) 60ms 27% 0x01075520
> [ 1345.621307] devfreq-event event3: nocp@10ca1c00 (event: 0/1064000) 60ms 0% 0x00000000
> [ 1345.681261] devfreq-event event0: nocp@10ca1000 (event: 289991/1064000) 60ms 27% 0x01097ebc
> [ 1345.681281] devfreq-event event1: nocp@10ca1400 (event: 0/1064000) 60ms 0% 0x00000000
> [ 1345.681298] devfreq-event event2: nocp@10ca1800 (event: 284773/1064000) 60ms 26% 0x0104b7d8
> [ 1345.681315] devfreq-event event3: nocp@10ca1c00 (event: 0/1064000) 60ms 0% 0x00000000
> [ 1345.741266] devfreq-event event0: nocp@10ca1000 (event: 290210/1064000) 60ms 27% 0x0109b214
> [ 1345.741286] devfreq-event event1: nocp@10ca1400 (event: 0/1064000) 60ms 0% 0x00000000
> [ 1345.741305] devfreq-event event2: nocp@10ca1800 (event: 284920/1064000) 60ms 26% 0x0104da28
> [ 1345.741323] devfreq-event event3: nocp@10ca1c00 (event: 0/1064000) 60ms 0% 0x00000000
> root@target:~/devfreq# 22501344+0 records in
> 22501344+0 records out
> 11520688128 bytes (12 GB, 11 GiB) copied, 205.316 s, 56.1 MB/s
> 
> [1]+  Done                    dd if=/dev/mmcblk0p5 of=/dev/null
> root@target:~/devfreq# cat /sys/class/devfreq/devfreq2/trans_stat
>      From  :   To
>            :  88700000 133000000 177400000 266000000 532000000   time(ms)
>    88700000:         0         0         0         0         1     19630
>   133000000:         0         0         0         0         1        90
> * 177400000:         0         0         0         0         5   1025540
>   266000000:         0         0         4         0         0    394620
>   532000000:         0         1         2         4         0     28000
> Total transition : 18
> root@target:~/devfreq# cat /sys/class/devfreq/devfreq2/trans_stat dmesg|tail
> [ 1474.562026] devfreq-event event2: nocp@10ca1800 (event: 254570/709600) 60ms 35% 0x00e910e8
> [ 1474.562140] devfreq-event event3: nocp@10ca1c00 (event: 0/709600) 60ms 0% 0x00000000
> [ 1474.631393] devfreq-event event0: nocp@10ca1000 (event: 255645/709600) 70ms 36% 0x01110f0c
> [ 1474.631440] devfreq-event event1: nocp@10ca1400 (event: 0/709600) 70ms 0% 0x00000000
> [ 1474.631474] devfreq-event event2: nocp@10ca1800 (event: 251797/709600) 70ms 35% 0x010cf2e0
> [ 1474.631508] devfreq-event event3: nocp@10ca1c00 (event: 0/709600) 70ms 0% 0x00000000
> [ 1474.691361] devfreq-event event0: nocp@10ca1000 (event: 257693/709600) 60ms 36% 0x00ebece4
> [ 1474.691390] devfreq-event event1: nocp@10ca1400 (event: 0/709600) 60ms 0% 0x00000000
> [ 1474.691416] devfreq-event event2: nocp@10ca1800 (event: 253602/709600) 60ms 35% 0x00e82e2c
> [ 1474.691441] devfreq-event event3: nocp@10ca1c00 (event: 0/709600) 60ms 0% 0x00000000
> 
> (c) modetest test (wcore enters highest freq):
> 
> root@target:~/devfreq# dmesg|tail
> [ 1519.281376] devfreq-event event2: nocp@10ca1800 (event: 244940/709600) 60ms 34% 0x00e04008
> [ 1519.281409] devfreq-event event3: nocp@10ca1c00 (event: 0/709600) 60ms 0% 0x00000000
> [ 1519.341390] devfreq-event event0: nocp@10ca1000 (event: 258097/709600) 60ms 36% 0x00ec4ba4
> [ 1519.341449] devfreq-event event1: nocp@10ca1400 (event: 0/709600) 60ms 0% 0x00000000
> [ 1519.341505] devfreq-event event2: nocp@10ca1800 (event: 254087/709600) 60ms 35% 0x00e89fcc
> [ 1519.341558] devfreq-event event3: nocp@10ca1c00 (event: 0/709600) 60ms 0% 0x00000000
> [ 1519.401322] devfreq-event event0: nocp@10ca1000 (event: 258749/709600) 60ms 36% 0x00ece454
> [ 1519.401352] devfreq-event event1: nocp@10ca1400 (event: 0/709600) 60ms 0% 0x00000000
> [ 1519.401382] devfreq-event event2: nocp@10ca1800 (event: 254742/709600) 60ms 35% 0x00e93960
> [ 1519.401410] devfreq-event event3: nocp@10ca1c00 (event: 0/709600) 60ms 0% 0x00000000
> root@target:~/devfreq# cat /sys/class/devfreq/devfreq2/trans_stat
>      From  :   To
>            :  88700000 133000000 177400000 266000000 532000000   time(ms)
>    88700000:         0         0         0         0         1     19630
>   133000000:         0         0         0         0         1        90
> * 177400000:         0         0         0         0         5   1073960
>   266000000:         0         0         4         0         0    394620
>   532000000:         0         1         2         4         0     28000
> Total transition : 18
> root@target:~/devfreq# ../modetest -s 43:1920x1080 -P41:1920x1080 &
> [1] 821
> root@target:~/devfreq# trying to open device 'i915'...failed
> trying to open device 'amdgpu'...failed
> trying to open device 'radeon'...failed
> trying to open device 'nouveau'...failed
> trying to open device 'vmwgfx'...failed
> trying to open device 'omapdrm'...failed
> trying to open device 'exynos'...done
> setting mode 1920x1080-60Hz@XR24 on connectors 43, crtc 41
> testing 1920x1080@XR24 overlay plane 36
> ^C
> 
> [1]+  Stopped                 ../modetest -s 43:1920x1080 -P41:1920x1080
> root@target:~/devfreq# cat /sys/class/devfreq/devfreq2/trans_stat
>      From  :   To
>            :  88700000 133000000 177400000 266000000 532000000   time(ms)
>    88700000:         0         0         0         0         1     19630
>   133000000:         0         0         0         0         1        90
>   177400000:         0         0         0         0         6   1089830
>   266000000:         0         0         4         0         0    394620
> * 532000000:         0         1         2         4         0     40520
> Total transition : 19
> root@target:~/devfreq# dmesg|tail
> [ 1552.161498] devfreq-event event2: nocp@10ca1800 (event: 498005/2128000) 60ms 23% 0x01c7f020
> [ 1552.161528] devfreq-event event3: nocp@10ca1c00 (event: 0/2128000) 60ms 0% 0x00000000
> [ 1552.221416] devfreq-event event0: nocp@10ca1000 (event: 513190/2128000) 60ms 24% 0x01d5d710
> [ 1552.221486] devfreq-event event1: nocp@10ca1400 (event: 0/2128000) 60ms 0% 0x00000000
> [ 1552.221552] devfreq-event event2: nocp@10ca1800 (event: 508518/2128000) 60ms 23% 0x01d18ff0
> [ 1552.221616] devfreq-event event3: nocp@10ca1c00 (event: 0/2128000) 60ms 0% 0x00000000
> [ 1552.281311] devfreq-event event0: nocp@10ca1000 (event: 505519/2128000) 60ms 23% 0x01ced138
> [ 1552.281336] devfreq-event event1: nocp@10ca1400 (event: 0/2128000) 60ms 0% 0x00000000
> [ 1552.281358] devfreq-event event2: nocp@10ca1800 (event: 499471/2128000) 60ms 23% 0x01c947b4
> [ 1552.281380] devfreq-event event3: nocp@10ca1c00 (event: 0/2128000) 60ms 0% 0x00000000
> root@target:~/devfreq# dmesg|tail
> [ 1557.951773] devfreq-event event2: nocp@10ca1800 (event: 510726/2128000) 60ms 24% 0x01d39584
> [ 1557.951851] devfreq-event event3: nocp@10ca1c00 (event: 0/2128000) 60ms 0% 0x00000000
> [ 1558.011229] devfreq-event event0: nocp@10ca1000 (event: 502846/2128000) 60ms 23% 0x01cc5eac
> [ 1558.011261] devfreq-event event1: nocp@10ca1400 (event: 0/2128000) 60ms 0% 0x00000000
> [ 1558.011291] devfreq-event event2: nocp@10ca1800 (event: 497245/2128000) 60ms 23% 0x01c73dfc
> [ 1558.011320] devfreq-event event3: nocp@10ca1c00 (event: 0/2128000) 60ms 0% 0x00000000
> [ 1558.081269] devfreq-event event0: nocp@10ca1000 (event: 511612/2128000) 70ms 24% 0x02227618
> [ 1558.081300] devfreq-event event1: nocp@10ca1400 (event: 0/2128000) 70ms 0% 0x00000000
> [ 1558.081328] devfreq-event event2: nocp@10ca1800 (event: 506381/2128000) 70ms 23% 0x021cdfa0
> [ 1558.081355] devfreq-event event3: nocp@10ca1c00 (event: 0/2128000) 70ms 0% 0x00000000
> root@target:~/devfreq# fg %1
> ../modetest -s 43:1920x1080 -P41:1920x1080
> 
> root@target:~/devfreq# dmesg|tail
> [ 1568.641483] devfreq-event event2: nocp@10ca1800 (event: 257123/709600) 60ms 36% 0x00eb675c
> [ 1568.641533] devfreq-event event3: nocp@10ca1c00 (event: 0/709600) 60ms 0% 0x00000000
> [ 1568.701434] devfreq-event event0: nocp@10ca1000 (event: 262797/709600) 60ms 37% 0x00f09930
> [ 1568.701479] devfreq-event event1: nocp@10ca1400 (event: 0/709600) 60ms 0% 0x00000000
> [ 1568.701522] devfreq-event event2: nocp@10ca1800 (event: 257838/709600) 60ms 36% 0x00ec0ef0
> [ 1568.701565] devfreq-event event3: nocp@10ca1c00 (event: 0/709600) 60ms 0% 0x00000000
> [ 1568.761201] devfreq-event event0: nocp@10ca1000 (event: 258960/709600) 60ms 36% 0x00ed15e0
> [ 1568.761220] devfreq-event event1: nocp@10ca1400 (event: 0/709600) 60ms 0% 0x00000000
> [ 1568.761236] devfreq-event event2: nocp@10ca1800 (event: 253698/709600) 60ms 35% 0x00e844a8
> [ 1568.761253] devfreq-event event3: nocp@10ca1c00 (event: 0/709600) 60ms 0% 0x00000000
> root@target:~/devfreq# cat /sys/class/devfreq/devfreq2/trans_stat
>      From  :   To
>            :  88700000 133000000 177400000 266000000 532000000   time(ms)
>    88700000:         0         0         0         0         1     19630
>   133000000:         0         0         0         0         1        90
> * 177400000:         0         0         0         0         6   1094030
>   266000000:         0         0         4         0         0    394620
>   532000000:         0         1         3         4         0     57630
> Total transition : 20
> 
> ---
> After appling proposed patches devfreq changes wcore frequencies according
> to bus load.
> 
> Kamil Konieczny (3):
>   PM / devfreq: exynos-nocp: fix debug print type
>   PM / devfreq: exynos-bus: prepare for change in load calc in
>     exynos-nocp
>   PM / devfreq: exynos-nocp: change load and total calculations
> 
>  drivers/devfreq/event/exynos-nocp.c | 61 ++++++++++++-----------------
>  drivers/devfreq/exynos-bus.c        | 21 +++++++++-
>  include/linux/devfreq-event.h       |  4 ++
>  3 files changed, 48 insertions(+), 38 deletions(-)
>