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libct/cg: add CFS bandwidth burst for CPU

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Burstable CFS controller is introduced in Linux 5.14. This helps with
parallel workloads that might be bursty. They can get throttled even
when their average utilization is under quota. And they may be latency
sensitive at the same time so that throttling them is undesired.

This feature borrows time now against the future underrun, at the cost
of increased interference against the other system users, by introducing
cfs_burst_us into CFS bandwidth control to enact the cap on unused
bandwidth accumulation, which will then used additionally for burst.

The patch adds the support/control for CFS bandwidth burst.

runtime-spec: https://github.com/opencontainers/runtime-spec/pull/1120

Co-authored-by: Akihiro Suda <suda.kyoto@gmail.com>
Co-authored-by: Nadeshiko Manju <me@manjusaka.me>
Signed-off-by: Kailun Qin <kailun.qin@intel.com>
This commit is contained in:
Kailun Qin
2021-09-09 18:29:31 -04:00
committed by Manjusaka
parent 319b2ba730
commit e1584831b6
12 changed files with 108 additions and 4 deletions
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docs/spec-conformance.md
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@@ -10,7 +10,6 @@ Spec version | Feature | PR
v1.0.0 | `SCMP_ARCH_PARISC` | Unplanned, due to lack of users
v1.0.0 | `SCMP_ARCH_PARISC64` | Unplanned, due to lack of users
v1.0.2 | `.linux.personality` | [#3126](https://github.com/opencontainers/runc/pull/3126)
v1.1.0 | `.linux.resources.cpu.burst` | [#3749](https://github.com/opencontainers/runc/pull/3749)
v1.1.0 | `SECCOMP_FILTER_FLAG_WAIT_KILLABLE_RECV` | [#3862](https://github.com/opencontainers/runc/pull/3862)
v1.1.0 | time namespaces | [#3876](https://github.com/opencontainers/runc/pull/3876)
v1.1.0 | rsvd hugetlb cgroup | TODO ([#3859](https://github.com/opencontainers/runc/issues/3859))