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feat(env): Add automatic memory limit handling #457
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,5 @@ | ||
| # See the OWNERS docs at https://go.k8s.io/owners | ||
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| approvers: | ||
| - dongjiang1989 | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,49 @@ | ||
| // Copyright 2026 The Kubernetes Authors. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
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| package goruntime | ||
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| import ( | ||
| "runtime/debug" | ||
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| "github.com/KimMachineGun/automemlimit/memlimit" | ||
| "github.com/go-logr/logr" | ||
| ) | ||
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| func SetMemLimit(logger logr.Logger, memlimitRatio float64) { | ||
| if memlimitRatio >= 1.0 { | ||
| memlimitRatio = 1.0 | ||
| } else if memlimitRatio <= 0.0 { | ||
| memlimitRatio = 0.0 | ||
| } | ||
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| // the memlimitRatio argument to 0, effectively disabling auto memory limit for all users. | ||
| if memlimitRatio == 0.0 { | ||
| return | ||
| } | ||
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| if _, err := memlimit.SetGoMemLimitWithOpts( | ||
| memlimit.WithRatio(memlimitRatio), | ||
| memlimit.WithProvider( | ||
| memlimit.ApplyFallback( | ||
| memlimit.FromCgroup, | ||
| memlimit.FromSystem, | ||
| ), | ||
| ), | ||
| ); err != nil { | ||
| logger.Error(err, "Failed to set GOMEMLIMIT automatically", "component", "automemlimit") | ||
| } | ||
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| logger.Info("Set GOMEMLIMIT", "value", debug.SetMemoryLimit(-1)) | ||
| } |
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We should be careful about taking external dependencies; they have a habit of become unmaintained and then we're stuck maintaining them, so it's often easier just to reimplement them. I think the question about the default behaviour of go is the most important one, though, more than this dependency (it is MIT licensed and looks to be maintained)