IKS: Fake data reported in cpu_freqency trace event

Bug #1190611 reported by Paweł Moll on 2013-06-13
20
This bug affects 2 people
Affects Status Importance Assigned to Milestone
Linaro big.LITTLE
New
Wishlist
Unassigned

Bug Description

Problem:

The cpu_frequency trace event (see include/trace/events/power.h) normally reports the cpufreq values. Unfortunately, in case of the IKS, the "little" operating points are hidden behind fake values. This is a problem when tracing the system behaviour, eg. using profiling tools - the user will be presented with non accurate view of the system.

Possible solutions:

1. Make sure that the trace events are reported with the real frequencies.
2. Provide special "cpu_real_frequency" trace event (can be IKS specific)
3. Provide translation table, either in the kernel or in userspace (special file in /sys or /proc)

tags: added: bl-iks
Amit Kucheria (amitk) on 2013-06-28
Changed in linaro-big-little-system:
importance: Undecided → Wishlist
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