linux-kernel - CONFIG_X86_INTEL_PSTATE disables CPU frequency transition stats, many governors and other standard features

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Date:	Sat, 27 Apr 2013 04:58:53 +0000 (UTC)
From:	"Artem S. Tashkinov" <t.artem@...os.com>
To:	linux-kernel@...r.kernel.org
Cc:	dirk.j.brandewie@...el.com, rjw@...k.pl, cpufreq@...r.kernel.org,
	linux-pm@...r.kernel.org
Subject: CONFIG_X86_INTEL_PSTATE disables CPU frequency transition stats,
 many governors and other standard features

Hello,

Just wanted to let everyone know that CONFIG_X86_INTEL_PSTATE wreaks
havoc with the CPU frequency subsystem in the Linux kernel.

With this option enabled:

1) All governors except performance and powersave are gone, ondemand
userspace, conservative

2) scaling_cur_freq is gone, thus user space utilities monitoring the CPU
frequency have stopped working

3) CPU frequency transition stats are gone, there's no "stats" directory
anywhere

4) scaling_available_frequencies is gone, so I cannot set the desired constant
CPU frequency (the userspace governor is not available anyway)

Is this an intended behavior? I shrivel to think that's the case.

The bug report is filed here: https://bugzilla.kernel.org/show_bug.cgi?id=57141

Best regards,

Artem
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