Hi!

A few patches trying to improve the sched hrtick feature, which is currently
disabled due to overhead.

I wrote these after the last OSPM, but I've been sitting on them because 0-day
is not having a good time with the second to last patch. I've not been able to
reproduce :-(

Anyway, the first few patches should be 'good' and hopefully one of you will
spot my 'obvious' fail in that late patch.

For those of you rocking ARM64 systems, if you pick up the generic entry patches:

  https://lkml.kernel.org/r/20250916082611.2972008-1-ruanjinjie@huawei.com

this late patch should also 'work' (or not as the case might be) for you.

Patches also here:

  git://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git sched/hrtick