[Barrelfish-users] Global CPU scheduling

[Zeus Gómez Marmolejo]

Hi all,

We were discussing some interesting work that could be tested on the ARM
big.LITTLE architecture. As this is an heterogeneous system, it is very
interesting for Barrelfish. But I had some questions regarding the task
scheduling. As far as I know, Barrelfish doesn't support system wide CPU
scheduling.

It can happen that an application running on a specific core, because of
the asymmetric cpu load or its own profile may need to be 'migrated' to a
faster core (or a different type of the current one). Would it be difficult
to do this?

I guess in a shared memory system, the dispatcher capabilities can be
transferred from one core to the other. Is this possible? But it would be
necessary to have a "cpu server" or something like that, keeping track of
the use of each CPU.

Then in this case, it would be desirable to switch off a CPU completely,
when all tasks running there have been migrated out of the core. How this
could be achieved in Barrelfish?


Cheers,

-- 
Zeus Gómez Marmolejo
Barcelona Supercomputing Center
PhD student
http://www.bsc.es
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