Post Syndicated from original https://lwn.net/Articles/880367/rss

Linux supports processor architectures where CPUs in the same system
might have
different processing capacities; for example, the Arm big.LITTLE
systems combine fast, power-hungry CPUs with slower, more efficient
ones. Linux has also run for years on simultaneous
multithreading (SMT) architectures, where one CPU executes multiple
independent execution threads and is seen as if it were multiple cores.
There are architectures that mix both approaches. A recent discussion
on a patch
set submitted by Ricardo Neri shows that, on these systems, the
scheduler might distribute tasks in an inefficient way.