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authorTejun Heo <tj@kernel.org>2019-08-29 01:05:58 +0300
committerJens Axboe <axboe@kernel.dk>2019-08-29 06:17:12 +0300
commit7caa47151ab2e644dd221f741ec7578d9532c9a3 (patch)
treef5ffe39d84924c03fb72f927ab420e3ca6a629ec /block/Kconfig
parent6f816b4b746c2241540e537682d30d8e9997d674 (diff)
downloadlinux-7caa47151ab2e644dd221f741ec7578d9532c9a3.tar.xz
blkcg: implement blk-iocost
This patchset implements IO cost model based work-conserving proportional controller. While io.latency provides the capability to comprehensively prioritize and protect IOs depending on the cgroups, its protection is binary - the lowest latency target cgroup which is suffering is protected at the cost of all others. In many use cases including stacking multiple workload containers in a single system, it's necessary to distribute IO capacity with better granularity. One challenge of controlling IO resources is the lack of trivially observable cost metric. The most common metrics - bandwidth and iops - can be off by orders of magnitude depending on the device type and IO pattern. However, the cost isn't a complete mystery. Given several key attributes, we can make fairly reliable predictions on how expensive a given stream of IOs would be, at least compared to other IO patterns. The function which determines the cost of a given IO is the IO cost model for the device. This controller distributes IO capacity based on the costs estimated by such model. The more accurate the cost model the better but the controller adapts based on IO completion latency and as long as the relative costs across differents IO patterns are consistent and sensible, it'll adapt to the actual performance of the device. Currently, the only implemented cost model is a simple linear one with a few sets of default parameters for different classes of device. This covers most common devices reasonably well. All the infrastructure to tune and add different cost models is already in place and a later patch will also allow using bpf progs for cost models. Please see the top comment in blk-iocost.c and documentation for more details. v2: Rebased on top of RQ_ALLOC_TIME changes and folded in Rik's fix for a divide-by-zero bug in current_hweight() triggered by zero inuse_sum. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Andy Newell <newella@fb.com> Cc: Josef Bacik <jbacik@fb.com> Cc: Rik van Riel <riel@surriel.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/Kconfig')
-rw-r--r--block/Kconfig10
1 files changed, 10 insertions, 0 deletions
diff --git a/block/Kconfig b/block/Kconfig
index 1b62ad6d0e12..41c0917ce622 100644
--- a/block/Kconfig
+++ b/block/Kconfig
@@ -135,6 +135,16 @@ config BLK_CGROUP_IOLATENCY
Note, this is an experimental interface and could be changed someday.
+config BLK_CGROUP_IOCOST
+ bool "Enable support for cost model based cgroup IO controller"
+ depends on BLK_CGROUP=y
+ select BLK_RQ_ALLOC_TIME
+ ---help---
+ Enabling this option enables the .weight interface for cost
+ model based proportional IO control. The IO controller
+ distributes IO capacity between different groups based on
+ their share of the overall weight distribution.
+
config BLK_WBT_MQ
bool "Multiqueue writeback throttling"
default y