50 lines
1.7 KiB
Go
50 lines
1.7 KiB
Go
// Copyright (c) 2017 Uber Technologies, Inc.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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// +build linux
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package runtime
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import (
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"math"
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cg "go.uber.org/automaxprocs/internal/cgroups"
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)
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// CPUQuotaToGOMAXPROCS converts the CPU quota applied to the calling process
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// to a valid GOMAXPROCS value.
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func CPUQuotaToGOMAXPROCS(minValue int) (int, CPUQuotaStatus, error) {
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cgroups, err := cg.NewCGroupsForCurrentProcess()
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if err != nil {
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return -1, CPUQuotaUndefined, err
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}
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quota, defined, err := cgroups.CPUQuota()
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if !defined || err != nil {
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return -1, CPUQuotaUndefined, err
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}
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maxProcs := int(math.Floor(quota))
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if minValue > 0 && maxProcs < minValue {
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return minValue, CPUQuotaMinUsed, nil
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}
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return maxProcs, CPUQuotaUsed, nil
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}
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