On 9/26/18 1:30 AM, Damien Le Moal wrote: > When the deadline scheduler is used with a zoned block device, writes > to a zone will be dispatched one at a time. This causes the warning > message: > > deadline: forced dispatching is broken (nr_sorted=X), please report this > > to be displayed when switching to another elevator with the legacy I/O > path while write requests to a zone are being retained in the scheduler > queue. > > Prevent this message from being displayed when executing > elv_drain_elevator() for a zoned block device. __blk_drain_queue() will > loop until all writes are dispatched and completed, resulting in the > desired elevator queue drain without extensive modifications to the > deadline code itself to handle forced-dispatch calls.
Applied for 4.19, thanks Damien. -- Jens Axboe
