{ //建立set featrue command(opcode=0x09 fid=0x0d),设置Host Memory Buffer //dword11-15参数可参考Figure 330: Host Memory Buffer – Command Dword 11 - Figure 334 result = nvme_setup_host_mem(dev); } result = nvme_setup_io_queues...
RSS(Resident set size),使用top命令可以查询到,是最常用的内存指标,表示进程占用的物理内存大小。但是,将各进程的RSS值相加,通常会超出整个系统的内存消耗,这是因为RSS中包含了各进程间共享的内存。 PSS(Proportional set size)所有使用某共享库的程序均分该共享库占用的内存时。显然所有进程的PSS之和就是系统的内...
1.NVMe Command NVMe Host(Server)和NVMe Controller(SSD)通过NVMe Command进行信息交互。NVMe Spec中定义了NVMe Command的格式,占用64字节。 NVMe Command分为Admin Command和IO Command两大类,前者主要是用于配置,后者用于数据传输。 NVMe Command是Host与SSD Controller交流的基本单元,应用的I/O请求也要转化成NVMe C...
nvme_ssd": "3.2T:large:1:3200:True", "ecs:performancetype": "ssd offload", "hw:numa_nodes": "1", "trust:trusted_host": "false", "hw:cpu_model": "", "hw:support_localdisk_alarm": "yes", "resource_type": "<all-in-list> ssd offload", "ecs:instance_architecture": "arm64"...
NVME_SET_ATTRIBUTES_ENTRY structure énumération NVME_STATUS_COMMAND_SPECIFIC_CODES énumération NVME_STATUS_GENERIC_COMMAND_CODES énumération NVME_STATUS_MEDIA_ERROR_CODES énumération NVME_STATUS_TYPES union NVME_SUBMISSION_QUEUE_TAIL_DOORBELL NVME_TELEMETRY_HOST_INITIATED_LOG structure énumération NV...
set_dev_node(&pdev->dev, first_memory_node); dev = kzalloc_node(sizeof(*dev), GFP_KERNEL, node); if(!dev) return-ENOMEM; dev->queues = kcalloc_node(num_possible_cpus() +1, sizeof(structnvme_queue), GFP_KERNEL, node);
Nvmeof(host端)实现: .queue_rq = nvme_rdma_queue_rq DeviceMapper实现: .queue_rq = dm_mq_queue_rq, ... 参考图: scsi_queue_rq 实现 代码语言:javascript 代码运行次数:0 运行 AI代码解释 xfs_iread_extents -> xfs_btree_visit_blocks -> xfs_btree_readahead_ptr -> xfs_buf_readahead 预读 ...
Following condition which will cause NULL pointer dereference will occur in nvme_free_host_mem() when it tries to remove pci device via nvme_remove() especially after a failure of host memory allocation for HMB. "(host_mem_descs == NULL) && (nr_host_mem_descs != 0)" It's because ...
pci_set_drvdata(pdev, dev);/*分配一个ID,保存到dev->instance里,实际上第一个加入的nvme设备,它的instance为0,第二个加入的nvme设备,instance为1,以此类推*/result=nvme_set_instance(dev);if(result)gotofree;/*主要创建两个dma pool,一个是4k大小(prp list page),一个是256B大小(prp list 256)*...
8、使用nvme_setup_host_mem在主机端分配DMA内存,用于设备的DMA操作,并通过nvme_admin_set_features 0x09这个命令设置给nvme设备。 9、nvme_setup_io_queues设置io queue: 1、首先会获取系统cpu个数,然后通过set feature命令去设置queue个数为cpu个数,然后根据命令的返回值去决定最终的queue个数; ...