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

[Lianbo Jiang]

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

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")
[3] commit <3301bc53358a> ("lib/sbitmap: kill 'depth' from sbitmap_word")

The patchset is tested on v5.17.0-rc8 and the latest kernel 5.18.0-rc4.

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

 defs.h    |  14 ++
 dev.c     | 373 ++++++++++++++++++++++++++++++++++++++++++++++++------
 symbols.c |  28 ++++
 3 files changed, 376 insertions(+), 39 deletions(-)

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2.20.1