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Rahat MahmoodandgVisor bot
d0c5abcfea
Add sentry control commands to read and write cgroup control values. PiperOrigin-RevId: 474663678
83 lines
2.7 KiB
Go
83 lines
2.7 KiB
Go
// Copyright 2021 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package cgroupfs
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import (
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"gvisor.dev/gvisor/pkg/atomicbitops"
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"gvisor.dev/gvisor/pkg/context"
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"gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs"
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"gvisor.dev/gvisor/pkg/sentry/kernel"
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"gvisor.dev/gvisor/pkg/sentry/kernel/auth"
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)
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// +stateify savable
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type cpuController struct {
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controllerCommon
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controllerStateless
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controllerNoResource
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// CFS bandwidth control parameters, values in microseconds.
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cfsPeriod atomicbitops.Int64
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cfsQuota atomicbitops.Int64
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// CPU shares, values should be (num core * 1024).
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shares atomicbitops.Int64
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}
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var _ controller = (*cpuController)(nil)
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func newCPUController(fs *filesystem, defaults map[string]int64) *cpuController {
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// Default values for controller parameters from Linux.
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c := &cpuController{
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cfsPeriod: atomicbitops.FromInt64(100000),
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cfsQuota: atomicbitops.FromInt64(-1),
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shares: atomicbitops.FromInt64(1024),
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}
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if val, ok := defaults["cpu.cfs_period_us"]; ok {
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c.cfsPeriod = atomicbitops.FromInt64(val)
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delete(defaults, "cpu.cfs_period_us")
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}
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if val, ok := defaults["cpu.cfs_quota_us"]; ok {
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c.cfsQuota = atomicbitops.FromInt64(val)
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delete(defaults, "cpu.cfs_quota_us")
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}
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if val, ok := defaults["cpu.shares"]; ok {
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c.shares = atomicbitops.FromInt64(val)
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delete(defaults, "cpu.shares")
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}
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c.controllerCommon.init(kernel.CgroupControllerCPU, fs)
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return c
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}
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// Clone implements controller.Clone.
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func (c *cpuController) Clone() controller {
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new := &cpuController{
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cfsPeriod: atomicbitops.FromInt64(c.cfsPeriod.Load()),
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cfsQuota: atomicbitops.FromInt64(c.cfsQuota.Load()),
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shares: atomicbitops.FromInt64(c.shares.Load()),
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}
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new.controllerCommon.cloneFromParent(c)
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return new
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}
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// AddControlFiles implements controller.AddControlFiles.
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func (c *cpuController) AddControlFiles(ctx context.Context, creds *auth.Credentials, _ *cgroupInode, contents map[string]kernfs.Inode) {
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contents["cpu.cfs_period_us"] = c.fs.newStubControllerFile(ctx, creds, &c.cfsPeriod, true)
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contents["cpu.cfs_quota_us"] = c.fs.newStubControllerFile(ctx, creds, &c.cfsQuota, true)
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contents["cpu.shares"] = c.fs.newStubControllerFile(ctx, creds, &c.shares, true)
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}
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