Failed to set CPUFreq ondemand governor's sampling_rate for Linux kernel 4.4

Open Leo-Yan opened this issue 9 years ago • 2 comments

Hi,

I saw Lisa set ondemand governor's sampling_rate in the folder: /sys/devices/system/cpu/cpufreq/ondemand/sampling_rate; but when I run Linux kernel 4.4 the folder has been changed as: /sys/devices/system/cpu/cpufreq/policy0/ondemand/sampling_rate and /sys/devices/system/cpu/cpufreq/policy1/ondemand/sampling_rate.

So finally this will introduce failure when run LISA for Juno's profiling with kernel 4.4.

Thanks, Leo Yan

Apr 26 '16 14:04 Leo-Yan

We should probably make the hard-coded path in: https://github.com/ARM-software/devlib/blob/master/devlib/module/cpufreq.py#L45 more generic. Which means, for example, at init time to probe which path as to be used.

Apr 27 '16 09:04 derkling

@setrofim any update on this side? Maybe WA implementation already address this issue? The "policyN" format seems to be standard for kernel >v4.4 with more than one frequency domain.

May 12 '16 09:05 derkling