On 9/24/19 5:11 AM, Pavel Begunkov wrote: > On 24/09/2019 13:34, Jens Axboe wrote: >> On 9/24/19 4:13 AM, Jens Axboe wrote: >>> On 9/24/19 3:49 AM, Peter Zijlstra wrote: >>>> On Tue, Sep 24, 2019 at 10:36:28AM +0200, Jens Axboe wrote: >>>> >>>>> +struct io_wait_queue { >>>>> + struct wait_queue_entry wq; >>>>> + struct io_ring_ctx *ctx; >>>>> + struct task_struct *task; >>>> >>>> wq.private is where the normal waitqueue stores the task pointer. >>>> >>>> (I'm going to rename that) >>> >>> If you do that, then we can just base the io_uring parts on that. >> >> Just took a quick look at it, and ran into block/kyber-iosched.c that >> actually uses the private pointer for something that isn't a task >> struct... >> > > Let reuse autoremove_wake_function anyway. Changed a bit your patch: Yep that should do it, and saves 8 bytes of stack as well. BTW, did you test my patch, this one or the previous? Just curious if it worked for you. -- Jens Axboe