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Jan Kara f3bdc62fd8 blktrace: Provide event for request merging 
Currently blk-mq does not report any event when two requests get merged
in the elevator. This then results in difficult to understand sequence
of events like:

...
  8,0   34     1579     0.608765271  2718  I  WS 215023504 + 40 [dbench]
  8,0   34     1584     0.609184613  2719  A  WS 215023544 + 56 <- (8,4) 2160568
  8,0   34     1585     0.609184850  2719  Q  WS 215023544 + 56 [dbench]
  8,0   34     1586     0.609188524  2719  G  WS 215023544 + 56 [dbench]
  8,0    3      602     0.609684162   773  D  WS 215023504 + 96 [kworker/3:1H]
  8,0   34     1591     0.609843593     0  C  WS 215023504 + 96 [0]

and you can only guess (after quite some headscratching since the above
excerpt is intermixed with a lot of other IO) that request 215023544+56
got merged to request 215023504+40. Provide proper event for request
merging like we used to do in the legacy block layer.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-06-25 21:06:11 -06:00
..
acpi Merge branch 'acpica' 2020-06-10 17:27:28 +02:00
asm-generic mm: Allow arches to provide ptep_get() 2020-06-20 22:14:53 +10:00
clocksource
crypto
drm drm/edid: Replace zero-length array with flexible-array 2020-06-15 23:08:31 -05:00
dt-bindings - qcom : 2020-06-11 12:42:14 -07:00
keys RxRPC: Replace zero-length array with flexible-array 2020-06-15 23:08:32 -05:00
kunit Documentation: test.h - fix warnings 2020-05-22 14:33:59 -06:00
kvm KVM: arm64: vgic-v3: Take cpu_if pointer directly instead of vcpu 2020-05-28 11:57:10 +01:00
linux block: move struct block_device to blk_types.h 2020-06-24 09:16:02 -06:00
math-emu
media media updates for v5.8-rc1 2020-06-13 13:09:38 -07:00
misc
net netfilter: flowtable: Make nf_flow_table_offload_add/del_cb inline 2020-06-15 18:06:52 -07:00
pcmcia pcmcia: Replace zero-length array with flexible-array 2020-05-18 10:28:31 +02:00
ras
rdma dynamic_debug: add an option to enable dynamic debug for modules only 2020-06-08 11:05:56 -07:00
scsi SCSI misc on 20200605 2020-06-05 15:11:50 -07:00
soc pci-v5.8-changes 2020-06-06 11:01:58 -07:00
sound ASoC: Updates for v5.8 2020-06-01 20:26:07 +02:00
target scsi: target: Rename target_setup_cmd_from_cdb() to target_cmd_parse_cdb() 2020-06-09 21:57:26 -04:00
trace blktrace: Provide event for request merging 2020-06-25 21:06:11 -06:00
uapi libnvdimm for 5.8-rc2 2020-06-20 13:13:21 -07:00
vdso
video
xen xen: Move xen_setup_callback_vector() definition to include/xen/hvm.h 2020-06-11 15:15:19 +02:00