On 2022-09-16 05:34, Yu Kuai wrote: > From: Yu Kuai <yukuai3@xxxxxxxxxx> > > Currently, wake_up() is called unconditionally in fast path such as > raid10_make_request(), which will cause lock contention under high > concurrency: > > raid10_make_request > wake_up > __wake_up_common_lock > spin_lock_irqsave > > Improve performance by only call wake_up() if waitqueue is not empty > in allow_barrier() and raid10_make_request(). > > Signed-off-by: Yu Kuai <yukuai3@xxxxxxxxxx> Reviewed-by: Logan Gunthorpe <logang@xxxxxxxxxxxx>
