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SubjectRe: [PATCH 12/13] block: introduce blk-iolatency io controller
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On 05/29/2018 02:17 PM, Josef Bacik wrote:
> From: Josef Bacik <jbacik@fb.com>
>
> Signed-off-by: Josef Bacik <jbacik@fb.com>
> ---
> block/Kconfig | 12 +
> block/Makefile | 1 +
> block/blk-iolatency.c | 844 ++++++++++++++++++++++++++++++++++++++++++++++
> block/blk-sysfs.c | 2 +
> block/blk.h | 6 +
> include/linux/blk_types.h | 2 -
> 6 files changed, 865 insertions(+), 2 deletions(-)
> create mode 100644 block/blk-iolatency.c
>
> diff --git a/block/Kconfig b/block/Kconfig
> index 28ec55752b68..a4e800f57688 100644
> --- a/block/Kconfig
> +++ b/block/Kconfig
> @@ -149,6 +149,18 @@ config BLK_WBT
> dynamically on an algorithm loosely based on CoDel, factoring in
> the realtime performance of the disk.
>
> +config BLK_CGROUP_IOLATENCY
> + bool "Enable support for latency based cgroup io protection"

IO protection"

There are currently no occurrences of "io" (standalone) in block/Kconfig
and it would be a bad precedent to add one, so please use that shift key. :)

> + depends on BLK_CGROUP=y
> + default n
> + ---help---
> + Enabling this option enables the .latency interface for io throttling.
> + The io controller will attempt to maintain average io latencies below
> + the configured latency target, throttling anybody with a higher latency
> + target than the victimized group.
> +
> + Note, this is an experimental interface and could be changed someday.
> +
> config BLK_WBT_SQ
> bool "Single queue writeback throttling"
> default n

--
~Randy

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