blk_queue_bio函数中包含了哪些主要操作？blk_queue_bio函数中包含了blk_queue_split、blk_queue_bounce...
上图中几个X2Y的解释: Q2I – time it takes to process an I/O prior to it being inserted or merged onto a request queue – Includes split, and remap time I2D – time the I/O is “idle” on the request queue D2C – time the I/O is “active” in the driver and on the device...
intblk_trace_ioctl(structblock_device *bdev, unsigned cmd,char__user *arg) {structrequest_queue *q;intret, start =0;charb[BDEVNAME_SIZE]; q=bdev_get_queue(bdev);if(!q)return-ENXIO; mutex_lock(&bdev->bd_mutex);switch(cmd) {caseBLKTRACESETUP: bdevname(bdev, b); ret=blk_trace_...
使用libblkio、QEMU 存储守护进程和 VDUSE vDPA 设备是一种遵循virtio 数据路径规范但具有特定于供应商的控制路径的设备。 vDPA 设备既可以物理位于硬件上,也可以通过软件模拟。 图片 主机内核中只需要一个小型 vDPA 父驱动程序来处理控制路径。主要优点是所有 vDPA 设备都具有统一的软件堆栈: 用于用户空间或客户 virt...
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); ...
The previous patch assigns interrupt vectors to all possible CPUs, so now hctx can be mapped to possible CPUs, this patch applies this fact to simplify queue mapping & schedule so that we don't need to handle CPU hotplug for dealing with physical CPU plug & unplug. With this simplication,...
void blk_free_flush_queue(struct blk_flush_queue *q); void blk_freeze_queue(struct request_queue *q); static inline bool biovec_phys_mergeable(struct request_queue *q, struct bio_vec *vec1, struct bio_vec *vec2) { unsigned long mask = queue_segment_boundary(q); ...
QUEUE_RW_ENTRY(blk_throtl_sample_time, "throttle_sample_time"); #endif /* legacy alias for logical_block_size: */ static struct queue_sysfs_entry queue_hw_sector_size_entry = { .attr = {.name = "hw_sector_size", .mode = 0444 }, @@ -640,9 +636,6 @@ static struct attribute...
blk_queue_physical_block_size blk_queue_rq_timeout blk_queue_split blk_queue_update_dma_alignment blk_queue_update_dma_pad blk_queue_virt_boundary blk_queue_write_cache blk_register_region blk_rq_map_kern blk_rq_map_sg blk_rq_map_user blk_rq_map_user_iov blk_rq_unma...
I IO inserted onto request queue elevator.c/trace_block_rq_insert M IO back merged with request on queue blk-core.c/trace_block_bio_backmerge P Plug request blk-core.c/trace_block_plug Q IO handled by request queue code blk-core.c/trace_block_bio_queue ...