IKS: No physical topology data is available

Bug #1190607 reported by Paweł Moll on 2013-06-13
This bug affects 2 people
Affects Status Importance Assigned to Milestone
Linaro big.LITTLE
Nicolas Pitre

Bug Description

Background: A profiling tool wants to present comprehensive information about the system. This includes list of all (physical) cores available in the system.

Situation: Let's assume the IKS system boots on the big cluster and (for whatever reason) stays on it forever, as in: never switches to the little one.

Problem: The tool (either in the userspace or in kernel) has no means of obtaining information about the other cores, in particular about their type.

Example: A15x2/A7x2 system. Boots on A15 and stays like this forever. The profiling tool knows that there are 4 cores in the system, knows that 2 currently active ones are A15, but has no way of knowing that the other two are A7s.

Solution: Provide topology data information, either as kernel API (enumerate all available cores and their cpuids) or in userspace (/proc/cpuinfo equivalent?).

tags: added: bl-iks
Amit Kucheria (amitk) on 2013-06-28
Changed in linaro-big-little-system:
importance: Undecided → Wishlist
assignee: nobody → Nicolas Pitre (npitre)
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