Re: [PATCH v4 5.12 0/8] remove task file notes

[Jens Axboe <axboe@kernel.dk>]

On 3/6/21 4:02 AM, Pavel Begunkov wrote:
> Introduce a mapping from ctx to all tctx, and using that removes
> file notes, i.e. taking a io_uring file note previously stored in
> task->io_uring->xa. It's needed because we don't free io_uring ctx
> until all submitters die/exec, and it became worse after killing
>  ->flush(). There are rough corner in a form of not behaving nicely,
> I'll address in follow-up patches. Also use it to do cancellations
> right.
> 
> The torture is as simple as below. It will get OOM in no time. Also,
> I plan to use it to fix recently broken cancellations.
> 
> while (1) {
> 	assert(!io_uring_queue_init(8, &ring, 0));
> 	io_uring_queue_exit(&ring);
> }
> 
> WARNING: hangs without reverting sq park refactoring

Got fixed separately - forgot to write that this series is applied,
thanks!

-- 
Jens Axboe