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

[Leo-Yan]

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

[mdigiorgio]

I think this is the same as #60, isn't it?

@jlelli was there a PR from you (is it #62?) addressing this?

[jlelli]

I think this is a devlib problem. The fix I came up with in #62 should be general enough, assuming devlib doesn't use any hardcoded path (like I think it does).

[mdigiorgio]

In fact, it is a devlib issue https://github.com/ARM-software/devlib/blob/master/devlib/module/cpufreq.py#L130

[derkling]

@Leo-Yan (if not yet done) can you please open an issue on devlib to track that?
https://github.com/ARM-software/devlib/issues

[Leo-Yan]

@derkling, have filed this issue on devlib: ARM-software/devlib#32.