Re: [Crash-utility] [PATCH v4 0/2] Get diskio statistics from the hw queues in blk-mq

Currently, crash doesn't support to display disk I/O statistics for blk-mq devices. The patchset will implement it by parsing the bitmap, it includes two patches: [1] [PATCH 1/2] Support for "dev -d|-D" options by parsing bitmap in blk-mq layer [2] [PATCH 2/2] Fix for "dev -d|-D" options to correctly display disk I/O statistics on linux v5.18-rc1 Related kernel commits: [1] commit 9a14d6ce4135 ("block: remove debugfs blk_mq_ctx dispatched/merged/completed attributes") [2] commit 4e5cc99e1e48 ("blk-mq: manage hctx map via xarray") The patchset is tested on v5.17.0-rc8 and the latest kernel 5.18.0-rc4. With the patchset: crash> dev -d MAJOR GENDISK NAME REQUEST_QUEUE TOTAL ASYNC SYNC 8 ffff93d2ca593400 sda ffff93d2c917b960 18 15 3 Changes since v3: [1] rename the 'struct bt_iter_data' to 'struct mq_inflight' [2] rename the 'struct bt_tags_iter_data' to 'struct bt_iter_data' [3] rename the 'flags' to 'reserved' [4] rename the 'bt_tags_for_each' to 'bt_for_each' [5] rename the 'bt_tags_iter' to 'bt_iter' [6] removed the 'if (!hctx || !dio)' from the queue_for_each_hw_ctx() [7] removed the 'if (!IS_KVADDR(hctx[i]))' from the queue_for_each_hw_ctx() [8] removed the local variable 'struct diskio tmp'