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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/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
limitBytes int64
}
var _ controller = (*memoryController)(nil)
func newMemoryController(fs *filesystem, defaults map[string]int64) *memoryController {
c := &memoryController{
// Linux sets this to (PAGE_COUNTER_MAX * PAGE_SIZE) by default, which
// is ~ 2**63 on a 64-bit system. So essentially, inifinity. The exact
// value isn't very important.
limitBytes: math.MaxInt64,
}
if val, ok := defaults["memory.limit_in_bytes"]; ok {
c.limitBytes = val
delete(defaults, "memory.limit_in_bytes")
}
c.controllerCommon.init(controllerMemory, fs)
return c
}
// AddControlFiles implements controller.AddControlFiles.
func (c *memoryController) AddControlFiles(ctx context.Context, creds *auth.Credentials, _ *cgroupInode, contents map[string]kernfs.Inode) {
contents["memory.usage_in_bytes"] = c.fs.newControllerFile(ctx, creds, &memoryUsageInBytesData{})
contents["memory.limit_in_bytes"] = c.fs.newStaticControllerFile(ctx, creds, linux.FileMode(0644), fmt.Sprintf("%d\n", c.limitBytes))
}
// +stateify savable
type memoryUsageInBytesData struct{}
// Generate implements vfs.DynamicBytesSource.Generate.
func (d *memoryUsageInBytesData) Generate(ctx context.Context, buf *bytes.Buffer) error {
// TODO(b/183151557): This is a giant hack, we're using system-wide
// accounting since we know there is only one cgroup.
k := kernel.KernelFromContext(ctx)
mf := k.MemoryFile()
mf.UpdateUsage()
_, totalBytes := usage.MemoryAccounting.Copy()
fmt.Fprintf(buf, "%d\n", totalBytes)
return nil
}
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