[Crash-utility] [PATCH v3 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 v2: [1] Remove the static_rqs[] and sched_tags to exactly follow up the kernel path [2] Add checking if the status of rq is inflight [3] Use TRUE/FALSE for readability [4] Replace "if MEMBER_EXISTS()" with "if VALID_MEMBER" [5] Align it with the colons Lianbo Jiang (2): Support for "dev -d|-D" options by parsing bitmap in blk-mq layer Fix for "dev -d|-D" options to correctly display disk I/O statistics on linux v5.18-rc1 defs.h | 12 +++ dev.c | 285 ++++++++++++++++++++++++++++++++++++++++++++++-------- symbols.c | 24 +++++ 3 files changed, 282 insertions(+), 39 deletions(-) -- 2.20.1