Messages in this thread |  | | From | Chanwoo Choi <> | Subject | [PATCH 0/2] PM / devfreq: Add debugfs support | Date | Tue, 7 Jan 2020 18:05:17 +0900 |
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Add debugfs interface to provide debugging information of devfreq device. It contains 'devfreq_summary' and 'debug_transitions' debugfs file in order to provide the simple profiling to user via debugfs without any specific profiling tool.
[Added debugfs file] - "/sys/kernel/debug/devfreq/devfreq_summary" : Show the summary of the registered devfreq devices. - "/sys/kernel/debug/devfreq/devfreq_transitions" : Show the frequency transition of the registered devfreq devices.
Recommend the each patch to check the detailed description of each fields of both devfreq_summary and devfreq_transitions.
This series contains the patch[1] and add the patch2 for 'devfreq_transitions' [1] https://patchwork.kernel.org/patch/11320265/ - [v3] PM / devfreq: Add debugfs support with devfreq_summary file
For example on Exynos5422-based Odroid-XU3 board, - In order to show the multiple governors on devfreq_summay result, change the governor of devfreq0 from simple_ondemand to userspace.
$ cat /sys/kernel/debug/devfreq/devfreq_summary dev_name dev parent_dev governor polling_ms cur_freq_hz min_freq_hz max_freq_hz ------------------------------ ---------- ---------- --------------- ---------- ------------ ------------ ------------ 10c20000.memory-controller devfreq0 userspace 0 206000000 165000000 825000000 soc:bus_wcore devfreq1 simple_ondemand 50 532000000 88700000 532000000 soc:bus_noc devfreq2 devfreq1 passive 0 111000000 66600000 111000000 soc:bus_fsys_apb devfreq3 devfreq1 passive 0 222000000 111000000 222000000 soc:bus_fsys devfreq4 devfreq1 passive 0 200000000 75000000 200000000 soc:bus_fsys2 devfreq5 devfreq1 passive 0 200000000 75000000 200000000 soc:bus_mfc devfreq6 devfreq1 passive 0 333000000 83250000 333000000 soc:bus_gen devfreq7 devfreq1 passive 0 266000000 88700000 266000000 soc:bus_peri devfreq8 devfreq1 passive 0 66600000 66600000 66600000 soc:bus_g2d devfreq9 devfreq1 passive 0 0 83250000 333000000 soc:bus_g2d_acp devfreq10 devfreq1 passive 0 0 66500000 266000000 soc:bus_jpeg devfreq11 devfreq1 passive 0 0 75000000 300000000 soc:bus_jpeg_apb devfreq12 devfreq1 passive 0 0 83250000 166500000 soc:bus_disp1_fimd devfreq13 devfreq1 passive 0 0 120000000 200000000 soc:bus_disp1 devfreq14 devfreq1 passive 0 0 120000000 300000000 soc:bus_gscl_scaler devfreq15 devfreq1 passive 0 0 150000000 300000000 soc:bus_mscl devfreq16 devfreq1 passive 0 0 84000000 666000000
$ cat /sys/kernel/debug/devfreq/devfreq_transitions time_ms dev_name dev parent_dev load_% old_freq_hz new_freq_hz ---------- ------------------------------ ---------- ---------- ---------- ------------ ------------ 14600 soc:bus_noc devfreq2 devfreq1 0 100000000 67000000 14600 soc:bus_fsys_apb devfreq3 devfreq1 0 200000000 100000000 14600 soc:bus_fsys devfreq4 devfreq1 0 200000000 100000000 14600 soc:bus_fsys2 devfreq5 devfreq1 0 150000000 75000000 14602 soc:bus_mfc devfreq6 devfreq1 0 222000000 96000000 14602 soc:bus_gen devfreq7 devfreq1 0 267000000 89000000 14602 soc:bus_g2d devfreq9 devfreq1 0 300000000 84000000 14602 soc:bus_g2d_acp devfreq10 devfreq1 0 267000000 67000000 14602 soc:bus_jpeg devfreq11 devfreq1 0 300000000 75000000 14602 soc:bus_jpeg_apb devfreq12 devfreq1 0 167000000 84000000 14603 soc:bus_disp1_fimd devfreq13 devfreq1 0 200000000 120000000 14603 soc:bus_disp1 devfreq14 devfreq1 0 300000000 120000000 14606 soc:bus_gscl_scaler devfreq15 devfreq1 0 300000000 150000000 14606 soc:bus_mscl devfreq16 devfreq1 0 333000000 84000000 14608 soc:bus_wcore devfreq1 9 333000000 84000000 14783 10c20000.memory-controller devfreq0 35 825000000 633000000 15873 soc:bus_wcore devfreq1 41 84000000 400000000 15873 soc:bus_noc devfreq2 devfreq1 0 67000000 100000000 [snip]
Depends on: It depends on patch[2] for preventing the merge conflic. [2] https://patchwork.kernel.org/patch/11320257/ - PM / devfreq: Add missing function description and rename static functions
Chanwoo Choi (2): PM / devfreq: Add debugfs support with devfreq_summary file PM / devfreq: Add devfreq_transitions debugfs file
drivers/devfreq/Kconfig | 13 ++ drivers/devfreq/devfreq.c | 206 +++++++++++++++++++++++++++++ drivers/devfreq/governor.h | 3 + drivers/devfreq/governor_passive.c | 2 + include/linux/devfreq.h | 1 + 5 files changed, 225 insertions(+)
-- 2.17.1
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