Re: v4.8-rc1: thinkpad x60: running at low frequency even during kernel build

On Sat, 2016-11-05 at 14:37 +0100, Pavel Machek wrote:

Hi!

quoted

[...]

quoted

So we seem to have thermal or ACPI regression in v4.9-rc3.

It is possible. Can you add either add printk
in acpi_processor_ppc_has_changed() or use ftrace and see do you
get to
these functions

acpi_processor_ppc_init()
acpi_processor_ppc_has_changed()
acpi_processor_ppc_notifier()

?

Yes, these seem to be called. Here's the log:

Try this

1. Either enable dyndebug or add 

#define DEBUG 1 
at the top of acpi-cpufreq.c


2.

diff --git a/drivers/acpi/processor_perflib.c

b/drivers/acpi/processor_perflib.c
index bb01dea..6074995 100644

--- a/drivers/acpi/processor_perflib.c
+++ b/drivers/acpi/processor_perflib.c

@@ -94,9 +94,14 @@ static int acpi_processor_ppc_notifier(struct

notifier_block *nb,
 
        ppc = (unsigned int)pr->performance_platform_limit;
 
+       printk(KERN_ERR "ppc = %d\n", ppc);
+
        if (ppc >= pr->performance->state_count)
                goto out;
 
+       printk(KERN_ERR "ppc = %d freq-limit %d\n", ppc, pr-

performance->states[ppc].

+                                     core_frequency * 1000);
+
        cpufreq_verify_within_limits(policy, 0,
                                     pr->performance->states[ppc].
                                     core_frequency * 1000);

Thanks,
Srinivas