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
kvm
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
ras
rdma
scsi
soc
sound
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