On 9/23/19 10:32 AM, Pavel Begunkov wrote: > Sorry, mixed the threads. > >>> >>> I'm not sure an extension is needed for such a special interface, why not >>> just put a ->threshold value next to the ctx->wait field and use either >>> the regular wait_event() APIs with the proper condition, or >>> wait_event_cmd() style APIs if you absolutely need something more complex >>> to happen inside? > Ingo, > io_uring works well without this patch just using wait_event_*() with > proper condition, but there are performance issues with spurious > wakeups. Detailed description in the previous mail. > Am I missing something? I think we can do the same thing, just wrapping the waitqueue in a structure with a count in it, on the stack. Got some flight time coming up later today, let me try and cook up a patch. -- Jens Axboe
