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Commit 20005244 authored by Matias Bjørling's avatar Matias Bjørling Committed by Jens Axboe
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null_blk: set use_per_node_hctx param to false 



The defaults for the module is to instantiate itself with blk-mq and a
submit queue for each CPU node in the system.

To save resources, initialize instead with a single submit queue.

Signed-off-by: default avatarMatias Bjorling <m@bjorling.me>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 89ed05ee

Documentation/block/null_blk.txt

+5 −4
Original line number Diff line number Diff line
@@ -65,7 +65,8 @@ hw_queue_depth=[0..qdepth]: Default: 64 


III: Multi-queue specific parameters



use_per_node_hctx=[0/1]: Default: 1

  If 1, the multi-queue block layer is instantiated with a hardware dispatch

  queue for each CPU node in the system. If 0, it is instantiated with the

  number of queues defined in the submit_queues parameter.
 
use_per_node_hctx=[0/1]: Default: 0

  0: The number of submit queues are set to the value of the submit_queues

     parameter.

  1: The multi-queue block layer is instantiated with a hardware dispatch

     queue for each CPU node in the system.

drivers/block/null_blk.c

+2 −2
Original line number Diff line number Diff line
@@ -101,9 +101,9 @@ static int hw_queue_depth = 64; 
module_param(hw_queue_depth, int, S_IRUGO);

MODULE_PARM_DESC(hw_queue_depth, "Queue depth for each hardware queue. Default: 64");



static bool use_per_node_hctx = true;

static bool use_per_node_hctx = false;

module_param(use_per_node_hctx, bool, S_IRUGO);

MODULE_PARM_DESC(use_per_node_hctx, "Use per-node allocation for hardware context queues. Default: true");

MODULE_PARM_DESC(use_per_node_hctx, "Use per-node allocation for hardware context queues. Default: false");



static void put_tag(struct nullb_queue *nq, unsigned int tag)

{