Re: [PATCH V6 5/8] io_uring: support sqe group with members depending on leader

[Ming Lei <ming.lei@redhat.com>]

On Fri, Oct 04, 2024 at 02:18:13PM +0100, Pavel Begunkov wrote:
> On 9/12/24 11:49, Ming Lei wrote:
> > IOSQE_SQE_GROUP just starts to queue members after the leader is completed,
> > which way is just for simplifying implementation, and this behavior is never
> > part of UAPI, and it may be relaxed and members can be queued concurrently
> > with leader in future.
> > 
> > However, some resource can't cross OPs, such as kernel buffer, otherwise
> > the buffer may be leaked easily in case that any OP failure or application
> > panic.
> > 
> > Add flag REQ_F_SQE_GROUP_DEP for allowing members to depend on group leader
> > explicitly, so that group members won't be queued until the leader request is
> > completed, the kernel resource lifetime can be aligned with group leader
> 
> That's the current and only behaviour, we don't need an extra flag
> for that. We can add it back later when anything changes.

OK.

Thanks, 
Ming