Messages in this thread | | | Date | Tue, 7 Dec 2021 14:51:12 +0100 | From | Peter Zijlstra <> | Subject | Re: [PATCH V1] fuse: give wakeup hints to the scheduler |
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On Tue, Dec 07, 2021 at 02:45:49PM +0100, Peter Zijlstra wrote:
> > What would be much nicer, is to look at all the threads on the waitq > > and pick one that previously ran on the current CPU if there's one. > > Could this be implemented? > > It would violate the FIFO semantics of _exclusive.
That said, look at kernel/locking/percpu-rwsem.c:percpu_rwsem_wake_function() for how to do really terrible things with waitqueues, possibly including what you suggest.
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