Hi all, just looked into the hrescnt issue again, specifically the corner case of a shadow thread switching from real-time policy to SCHED_OTHER.
Looks like we don't support this at all ATM:
do_setsched_event ignores events that enabled SCHED_OTHER, and the
XNOTHER flag is only set on xnshadow_map, not updated anywhere else.
Fixing this is not straightforward as that flag resides in a state
variable that is owned by the thread (ie. updated non-atomically) while
do_setsched_event can also be called over different contexts.
Or am I missing something?
In the light of this, I would vote for reverting f9bfab3457 ("only
update rescnt for XNOTHER threads") as it only adds conditional branches
to the hot paths without solving the issue.
Jan
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