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Subject[PATCH v4 0/2] Historical Service Time Path Selector
Date
Hi,

This fourth version of HST applies the suggestion from Mikulas Patocka
to do the ktime_get_ns inside the mpath map_bio instead of generic
device-mapper code. This means that struct dm_mpath_io gained another
64bit field. For the request-based case, we continue to use the block
layer start time information.

With this modification, I was able obtain similar performance on BIO
to request-based multipath with HST on the benchmarks shared in v1.

v3: https://www.redhat.com/archives/dm-devel/2020-April/msg00308.html
v2: https://www.redhat.com/archives/dm-devel/2020-April/msg00270.html
v1: https://www.redhat.com/archives/dm-devel/2020-April/msg00176.html

Gabriel Krisman Bertazi (1):
md: mpath: Pass IO start time to path selector

Khazhismel Kumykov (1):
md: mpath: Add Historical Service Time Path Selector

drivers/md/Kconfig | 11 +
drivers/md/Makefile | 1 +
drivers/md/dm-historical-service-time.c | 561 ++++++++++++++++++++++++
drivers/md/dm-mpath.c | 12 +-
drivers/md/dm-path-selector.h | 2 +-
drivers/md/dm-queue-length.c | 2 +-
drivers/md/dm-service-time.c | 2 +-
7 files changed, 585 insertions(+), 6 deletions(-)
create mode 100644 drivers/md/dm-historical-service-time.c

--
2.26.2

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