Re: [PATCH 6/6] blk-mq: remove REQ_ATOM_STARTED

Bart Van Assche
2017-12-12T22:20:48Z

On Tue, 2017-12-12 at 11:01 -0800, Tejun Heo wrote:
> @@ -409,7 +407,7 @@ static void hctx_show_busy_rq(struct request *rq, void *data, bool reserved)
> const struct show_busy_params *params = data;
>
> if (blk_mq_map_queue(rq->q, rq->mq_ctx->cpu) == params->hctx &&
> - test_bit(REQ_ATOM_STARTED, &rq->atomic_flags))
> + blk_mq_rq_state(rq) != MQ_RQ_IDLE)
> __blk_mq_debugfs_rq_show(params->m,
> list_entry_rq(&rq->queuelist));

The above code should show all requests owned by the block driver. Patch
"blk-mq-debugfs: Also show requests that have not yet been started" (not yet
in Jens' tree) changes the REQ_ATOM_STARTED test into list_empty(&rq->queuelist).
Can that change be supported with the existing MQ_RQ_* states or will a new
state have to be introduced to support this? See also
https://marc.info/?l=linux-block&m=151252188411991.

Thanks,

Bart.