Re: [PATCH 2/2] fdmon-io_uring: check CQ ring directly in gsource_check

[Stefan Hajnoczi <stefanha@redhat.com>]

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On Fri, Feb 13, 2026 at 07:26:37AM -0700, Jens Axboe wrote:
> gsource_check() only looks at the ppoll revents for the io_uring fd,
> but CQEs can be posted during gsource_prepare()'s io_uring_submit()
> call via kernel task_work processing on syscall exit. These completions
> are already sitting in the CQ ring but the ring fd may not be signaled
> yet, causing gsource_check() to return false.
> 
> Add a fallback io_uring_cq_ready() check so completions that arrive
> during submission are dispatched immediately rather than waiting for
> the next ppoll() cycle.
> 
> Signed-off-by: Jens Axboe <axboe@kernel.dk>
> ---
>  util/fdmon-io_uring.c | 14 +++++++++++++-
>  1 file changed, 13 insertions(+), 1 deletion(-)

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>

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