On 8/17/22 04:28, Peter Zijlstra wrote:
On Tue, Aug 16, 2022 at 03:27:32PM -0400, Waiman Long wrote:
This will be some changes in behavior for arm64 systems with asymmetric
CPUs in some corner cases. For instance, if sched_setaffinity()
has never been called and there is a cpuset change before
relax_compatible_cpus_allowed_ptr() is called, its subsequent call will
follow what the cpuset allows but not what the previous cpu affinity
setting allows.
That's arguably a correctness fix, no? That is, the save/restore should
not have been allowed to revert to an earlier cpuset state.
Yes, it is a correctness fix in a sense. I just want to highlight that
there will be some slight changes in behavior in some corner cases for
the arm64 arch.
Cheers,
Longman
