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authorPatrick Bellasi <patrick.bellasi@arm.com>2015-06-23 09:17:54 +0100
committerSyed Rameez Mustafa <rameezmustafa@codeaurora.org>2016-10-10 11:09:53 -0700
commite89595cd93c7a5e8d4d85e69c06d9e14b93b3510 (patch)
treec4e0f2fa04390609128eea54e9055a5b3f2c7272 /init/Kconfig
parent6bbaf84de6841abe99b14dde599f7a2f5a8f8202 (diff)
sched/tune: add initial support for CGroups based boosting
To support task performance boosting, the usage of a single knob has the advantage to be a simple solution, both from the implementation and the usability standpoint. However, on a real system it can be difficult to identify a single value for the knob which fits the needs of multiple different tasks. For example, some kernel threads and/or user-space background services should be better managed the "standard" way while we still want to be able to boost the performance of specific workloads. In order to improve the flexibility of the task boosting mechanism this patch is the first of a small series which extends the previous implementation to introduce a "per task group" support. This first patch introduces just the basic CGroups support, a new "schedtune" CGroups controller is added which allows to configure different boost value for different groups of tasks. To keep the implementation simple but still effective for a boosting strategy, the new controller: 1. allows only a two layer hierarchy 2. supports only a limited number of boost groups A two layer hierarchy allows to place each task either: a) in the root control group thus being subject to a system-wide boosting value b) in a child of the root group thus being subject to the specific boost value defined by that "boost group" The limited number of "boost groups" supported is mainly motivated by the observation that in a real system it could be useful to have only few classes of tasks which deserve different treatment. For example, background vs foreground or interactive vs low-priority. As an additional benefit, a limited number of boost groups allows also to have a simpler implementation especially for the code required to compute the boost value for CPUs which have runnable tasks belonging to different boost groups. Change-Id: I1304e33a8440bfdad9c8bcf8129ff390216f2e32 cc: Tejun Heo <tj@kernel.org> cc: Li Zefan <lizefan@huawei.com> cc: Johannes Weiner <hannes@cmpxchg.org> cc: Ingo Molnar <mingo@redhat.com> cc: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Patrick Bellasi <patrick.bellasi@arm.com> Git-commit: 13001f47c9a610705219700af4636386b647e231 Git-repo: https://android.googlesource.com/kernel/common Signed-off-by: Vikram Mulukutla <markivx@codeaurora.org>
Diffstat (limited to 'init/Kconfig')
-rw-r--r--init/Kconfig17
1 files changed, 17 insertions, 0 deletions
diff --git a/init/Kconfig b/init/Kconfig
index 311669332867..eb9e1a0aa688 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1002,6 +1002,23 @@ config CGROUP_CPUACCT
config PAGE_COUNTER
bool
+config CGROUP_SCHEDTUNE
+ bool "CFS tasks boosting cgroup subsystem (EXPERIMENTAL)"
+ depends on SCHED_TUNE
+ help
+ This option provides the "schedtune" controller which improves the
+ flexibility of the task boosting mechanism by introducing the support
+ to define "per task" boost values.
+
+ This new controller:
+ 1. allows only a two layers hierarchy, where the root defines the
+ system-wide boost value and its direct childrens define each one a
+ different "class of tasks" to be boosted with a different value
+ 2. supports up to 16 different task classes, each one which could be
+ configured with a different boost value
+
+ Say N if unsure.
+
config MEMCG
bool "Memory Resource Controller for Control Groups"
select PAGE_COUNTER