• Adam Manzanares's avatar
    block: fix inheriting request priority from bio · 85003a44
    Adam Manzanares authored
    In 4.10 I introduced a patch that associates the ioc priority with
    each request in the block layer. This work was done in the single queue
    block layer code. This patch unifies ioc priority to request mapping across
    the single/multi queue block layers.
    
    I have tested this patch with the null block device driver with the following
    parameters.
    
    null_blk queue_mode=2 irqmode=0 use_per_node_hctx=1 nr_devices=1
    
    I have not seen a performance regression with this patch and I would appreciate
    any feedback or additional testing.
    
    I have also verified that io priorities are passed to the device when using
    the SQ and MQ path to a SATA HDD that supports io priorities.
    Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
    Signed-off-by: default avatarAdam Manzanares <adam.manzanares@wdc.com>
    Reviewed-by: default avatarBart Van Assche <bart.vanassche@sandisk.com>
    Signed-off-by: default avatarJens Axboe <axboe@fb.com>
    85003a44
blk-core.c 93.3 KB