Hi!

General description

This is the result of development and maintenance of task isolation
functionality that originally started based on task isolation patch
v15 and was later updated to include v16. It provided predictable
environment for userspace tasks running on arm64 processors alongside
with full-featured Linux environment. It is intended to provide
reliable interruption-free environment from the point when a userspace
task enters isolation and until the moment it leaves isolation or
receives a signal intentionally sent to it, and was successfully used
for this purpose. While CPU isolation with nohz provides an
environment that is close to this requirement, the remaining IPIs and
other disturbances keep it from being usable for tasks that require
complete predictability of CPU timing.

So... what kind of guarantees does this aim to provide / what tasks it
is useful for?

For real time response, we have other approaches.

If you want to guarantee performnace of the "isolated" task... I don't
see how that works. Other tasks on the system still compete for DRAM
bandwidth, caches, etc...

So... what is the usecase?
								Pavel
-- 
http://www.livejournal.com/~pavelmachek