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// Copyright 2021 The gVisor 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.
package cgroupfs
import (
"bytes"
"fmt"
"math"
"gvisor.dev/gvisor/pkg/abi/linux"
"gvisor.dev/gvisor/pkg/atomicbitops"
"gvisor.dev/gvisor/pkg/context"
"gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs"
"gvisor.dev/gvisor/pkg/sentry/kernel"
"gvisor.dev/gvisor/pkg/sentry/kernel/auth"
"gvisor.dev/gvisor/pkg/sentry/usage"
)
// +stateify savable
type memoryController struct {
controllerCommon
controllerNoResource
limitBytes atomicbitops.Int64
softLimitBytes atomicbitops.Int64
moveChargeAtImmigrate atomicbitops.Int64
pressureLevel int64
// memCg is the memory cgroup for this controller.
memCg *memoryCgroup
}
var _ controller = (*memoryController)(nil)
func newMemoryController(fs *filesystem, defaults map[string]int64) *memoryController {
c := &memoryController{
// Linux sets these limits to (PAGE_COUNTER_MAX * PAGE_SIZE) by default,
// which is ~ 2**63 on a 64-bit system. So essentially, infinity. The
// exact value isn't very important.
limitBytes: atomicbitops.FromInt64(math.MaxInt64),
softLimitBytes: atomicbitops.FromInt64(math.MaxInt64),
}
consumeDefault := func(name string, valPtr *atomicbitops.Int64) {
if val, ok := defaults[name]; ok {
valPtr.Store(val)
delete(defaults, name)
}
}
consumeDefault("memory.limit_in_bytes", &c.limitBytes)
consumeDefault("memory.soft_limit_in_bytes", &c.softLimitBytes)
consumeDefault("memory.move_charge_at_immigrate", &c.moveChargeAtImmigrate)
c.controllerCommon.init(kernel.CgroupControllerMemory, fs)
return c
}
// Clone implements controller.Clone.
func (c *memoryController) Clone() controller {
new := &memoryController{
limitBytes: atomicbitops.FromInt64(c.limitBytes.Load()),
softLimitBytes: atomicbitops.FromInt64(c.softLimitBytes.Load()),
moveChargeAtImmigrate: atomicbitops.FromInt64(c.moveChargeAtImmigrate.Load()),
}
new.controllerCommon.cloneFromParent(c)
return new
}
// AddControlFiles implements controller.AddControlFiles.
func (c *memoryController) AddControlFiles(ctx context.Context, creds *auth.Credentials, cg *cgroupInode, contents map[string]kernfs.Inode) {
c.memCg = &memoryCgroup{cg}
contents["memory.usage_in_bytes"] = c.fs.newControllerFile(ctx, creds, &memoryUsageInBytesData{memCg: &memoryCgroup{cg}}, true)
contents["memory.limit_in_bytes"] = c.fs.newStubControllerFile(ctx, creds, &c.limitBytes, true)
contents["memory.soft_limit_in_bytes"] = c.fs.newStubControllerFile(ctx, creds, &c.softLimitBytes, true)
contents["memory.move_charge_at_immigrate"] = c.fs.newStubControllerFile(ctx, creds, &c.moveChargeAtImmigrate, true)
contents["memory.pressure_level"] = c.fs.newStaticControllerFile(ctx, creds, linux.FileMode(0644), fmt.Sprintf("%d\n", c.pressureLevel))
}
// Enter implements controller.Enter.
func (c *memoryController) Enter(t *kernel.Task) {
// Update the new cgroup id for the task.
t.SetMemCgID(c.memCg.ID())
}
// Leave implements controller.Leave.
func (c *memoryController) Leave(t *kernel.Task) {
// Update the cgroup id for the task to zero.
t.SetMemCgID(0)
}
// PrepareMigrate implements controller.PrepareMigrate.
func (c *memoryController) PrepareMigrate(t *kernel.Task, src controller) error {
return nil
}
// CommitMigrate implements controller.CommitMigrate.
func (c *memoryController) CommitMigrate(t *kernel.Task, src controller) {
// Start tracking t at dst by updating the memCgID.
t.SetMemCgID(c.memCg.ID())
}
// AbortMigrate implements controller.AbortMigrate.
func (c *memoryController) AbortMigrate(t *kernel.Task, src controller) {}
// +stateify savable
type memoryCgroup struct {
*cgroupInode
}
// Collects all the memory cgroup ids for the cgroup.
func (memCg *memoryCgroup) collectMemCgIDs(memCgIDs map[uint32]struct{}) {
// Add ourselves.
memCgIDs[memCg.ID()] = struct{}{}
// Add our children.
memCg.forEachChildDir(func(d *dir) {
cg := memoryCgroup{d.cgi}
cg.collectMemCgIDs(memCgIDs)
})
}
// Returns the memory usage for all cgroup ids in memCgIDs.
func getUsage(k *kernel.Kernel, memCgIDs map[uint32]struct{}) uint64 {
k.MemoryFile().UpdateUsage(memCgIDs)
var totalBytes uint64
for id := range memCgIDs {
_, bytes := usage.MemoryAccounting.CopyPerCg(id)
totalBytes += bytes
}
return totalBytes
}
// +stateify savable
type memoryUsageInBytesData struct {
memCg *memoryCgroup
}
// Generate implements vfs.DynamicBytesSource.Generate.
func (d *memoryUsageInBytesData) Generate(ctx context.Context, buf *bytes.Buffer) error {
k := kernel.KernelFromContext(ctx)
memCgIDs := make(map[uint32]struct{})
d.memCg.collectMemCgIDs(memCgIDs)
totalBytes := getUsage(k, memCgIDs)
fmt.Fprintf(buf, "%d\n", totalBytes)
return nil
}
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