blk_mq_init_queue:初始化IO请求队列--request_queue。函数的主要流程如下: 调用blk_alloc_queue_node分配请求队列的内存,分配的内存节点与设备连接的NUMA节点一致,避免远端内存访问问题。 调用blk_mq_init_allocated_queue初始化分配的请求队列(request_queue),blk-mq的request_queue中包含两层队列,即percpu的软件...
blk_init_queue_node(request_fn_proc *rfn, spinlock_t *lock, int node_id) { struct request_queue *uninit_q, *q; uninit_q = blk_alloc_queue_node(GFP_KERNEL, node_id); if (!uninit_q) return NULL; q = blk_init_allocated_queue(uninit_q, rfn, lock); if (!q) blk_cleanup_queue...
blk_sync_queue(q); blk_mq_cancel_work_sync(q); blk_mq_exit_queue(q);/* @q is and will stay empty, shutdown and put */ blk_put_queue(q); } EXPORT_SYMBOL(blk_mq_destroy_queue);@@ -4029,6 +4026,7 @@ struct gendisk *__blk_mq_alloc_disk(struct blk_mq_tag_set *set, vo...
AI代码解释 -blockdev node-name=drive_src1,driver=virtio-blk-vhost-vdpa,path=/dev/vhost-vdpa-0,cache.direct=on \-device virtio-blk-pci,id=src1,bootindex=2,drive=drive_src1 \ 无论如何,为了充分利用 vDPA 硬件设备的性能,我们始终可以使用QEMU 提供的通用设备vhost-vdpa-device-pci,该设备支持任何...
spin_lock_irq(q->queue_lock); @@ -1520,7 +1520,6 @@ struct request *blk_get_request(struct request_queue *q, unsigned int op, 15201520 req=blk_mq_alloc_request(q,op, 15211521 (gfp_mask&__GFP_DIRECT_RECLAIM) ? 15221522 0:BLK_MQ_REQ_NOWAIT); ...
dev = of_device_alloc(np, bus_id, parent); of_device_add device_add bus_add_device klist_add_tail(&dev->p->knode_bus, &bus->p->klist_devices); (2)流程描述 从上面1的代码流程可以看出,在初始化时会解析__fdt_pointer对应地址的dtb,把整个dtb进行扫描,获取对应的数据结构并存放在of_root中...
vblk->disk = alloc_disk(1 << PART_BITS); memset(&vblk->tag_set, 0, sizeof(vblk->tag_set)); vblk->tag_set.ops = &virtio_mq_ops; vblk->tag_set.queue_depth = virtblk_queue_depth; vblk->tag_set.numa_node = NUMA_NO_NODE; ...
(reschedule) vdpasim_schedule_work simdev = vdpasim_create(&dev_attr, config) ops = &vdpasim_batch_config_ops or ops = &vdpasim_config_ops vdpa = __vdpa_alloc_device(NULL, ops, dev_attr->ngroups, dev_attr->nas, dev_attr->alloc_size, dev_attr->name, use_va) -> allocate and...
struct blk_mq_tag_set *set, struct request_queue *q, int hctx_idx, int node) { - struct blk_mq_hw_ctx *hctx; + struct blk_mq_hw_ctx *hctx = NULL, *tmp; - hctx = blk_mq_alloc_hctx(q, set, hctx_idx, node);
高吞吐量顺序写入 delalloc 利用批量分配优化连续写入性能(如日志服务器、大数据处理)低延迟关键业务 nodelalloc 避免单次写入延迟波动(如数据库事务、实时系统) 2.1 块设备IO跟踪 # 安装blktrace...包 sudo yum install blktrace # blktrace包安装...