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.
Note:
The patchset depends on the implementation of sbitmap.c, so need to
apply another patchset: "[PATCH 0/4] Fix for "sbitmapq" command" before
testing it, otherwise it won't work.
Link: https://www.mail-archive.com/crash-utility@xxxxxxxxxx/msg09177.html
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 | 13 +++
dev.c | 316 +++++++++++++++++++++++++++++++++++++++++++++++-------
symbols.c | 26 +++++
3 files changed, 316 insertions(+), 39 deletions(-)
--
2.20.1
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