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6b15ca19cd
Fixes: #7081 Review all reservations and limits set, test under stress load (using both memory and CPU). The goal: system components (Talos itself) and runtime (kubelet, CRI) should survive under extreme resource starvation (workloads consuming all CPU/memory). Uses #9337 to visualize changes, but doesn't depend on it. Signed-off-by: Andrey Smirnov <andrey.smirnov@siderolabs.com>
53 lines
1.4 KiB
Go
53 lines
1.4 KiB
Go
// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this
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// file, You can obtain one at http://mozilla.org/MPL/2.0/.
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package cgroup
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import (
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"runtime"
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"sync"
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"github.com/google/cadvisor/utils/sysfs"
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"github.com/google/cadvisor/utils/sysinfo"
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)
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var availableCPUCores = sync.OnceValue(func() int {
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_, cores, err := sysinfo.GetNodesInfo(sysfs.NewRealSysFs())
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if err != nil || cores < 1 {
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return runtime.NumCPU()
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}
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return cores
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})
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// MilliCores represents a CPU value in milli-cores.
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type MilliCores uint
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// AvailableMilliCores returns the number of available CPU cores in milli-cores.
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func AvailableMilliCores() MilliCores {
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return MilliCores(availableCPUCores()) * 1000
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}
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// CPUShare represents a CPU share value.
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type CPUShare uint64
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// MilliCoresToShares converts milli-cores to CPU shares.
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func MilliCoresToShares(milliCores MilliCores) CPUShare {
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return CPUShare(milliCores) * 1024 / 1000
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}
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// SharesToCPUWeight converts CPU shares to CPU weight.
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func SharesToCPUWeight(shares CPUShare) uint64 {
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return uint64((((shares - 2) * 9999) / 262142) + 1)
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}
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// MillicoresToCPUWeight converts milli-cores to CPU weight.
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//
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// It limits millicores to available CPU cores.
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func MillicoresToCPUWeight(requested MilliCores) uint64 {
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requested = min(requested, AvailableMilliCores())
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return SharesToCPUWeight(MilliCoresToShares(requested))
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}
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