Re: [PATCHSET v4 0/5] Add io_uring support for waitid

[Jens Axboe <axboe@kernel.dk>]

On 9/9/23 9:11 AM, Jens Axboe wrote:
> Hi,
> 
> This adds support for IORING_OP_WAITID, which is an async variant of
> the waitid(2) syscall. Rather than have a parent need to block waiting
> on a child task state change, it can now simply get an async notication
> when the requested state change has occured.
> 
> Patches 1..4 are purely prep patches, and should not have functional
> changes. They split out parts of do_wait() into __do_wait(), so that
> the prepare-to-wait and sleep parts are contained within do_wait().
> 
> Patch 5 adds io_uring support.
> 
> I wrote a few basic tests for this, which can be found in the
> 'waitid' branch of liburing:
> 
> https://git.kernel.dk/cgit/liburing/log/?h=waitid
> 
> Also spun a custom kernel for someone to test it, and no issues reported
> so far.

Forget to mention that I also ran all the ltp testcases for any wait*
syscall test, and everything still passes just fine.

-- 
Jens Axboe