On 09/22/2016 05:41 PM, Thomas Gleixner wrote:
On Thu, 22 Sep 2016, Davidlohr Bueso wrote:
On Thu, 22 Sep 2016, Waiman Long wrote:
BTW, my initial attempt for the new futex was to use the same workflow as
the PI futexes, but use mutex which has optimistic spinning instead of
rt_mutex.
Btw, Thomas, do you still have any interest pursuing this for rtmutexes from
-rt into mainline? If so I can resend the patches from a while ago.
Certainly yes. My faint memory tells me that there was some potential issue
due to boosting the owner only if it gets scheduled out, but I might be
wrong.
It is tricky to add optimistic spinning to rtmutexes because of the need
to observe process priorities. It is certainly possible to make the top
waiter spin, but then I am not sure how much performance gain with just
that.
Cheers,
Longman
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