| From: |
| Gabriel Krisman Bertazi <krisman-AT-collabora.com> |
| To: |
| agk-AT-redhat.com, snitzer-AT-redhat.com |
| Subject: |
| [PATCH v4 0/2] Historical Service Time Path Selector |
| Date: |
| Mon, 11 May 2020 12:39:08 -0400 |
| Message-ID: |
| <20200511163910.3778467-1-krisman@collabora.com> |
| Cc: |
| dm-devel-AT-redhat.com, linux-kernel-AT-vger.kernel.org, song-AT-kernel.org, breeves-AT-redhat.com, mpatocka-AT-redhat.com, khazhy-AT-google.com, Gabriel Krisman Bertazi <krisman-AT-collabora.com>, kernel-AT-collabora.com |
| Archive-link: |
| Article |
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/msg00...
v2: https://www.redhat.com/archives/dm-devel/2020-April/msg00...
v1: https://www.redhat.com/archives/dm-devel/2020-April/msg00...
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
