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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"
"gvisor.dev/gvisor/pkg/bitmap"
"gvisor.dev/gvisor/pkg/context"
"gvisor.dev/gvisor/pkg/errors/linuxerr"
"gvisor.dev/gvisor/pkg/hostarch"
"gvisor.dev/gvisor/pkg/log"
"gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs"
"gvisor.dev/gvisor/pkg/sentry/kernel"
"gvisor.dev/gvisor/pkg/sentry/kernel/auth"
"gvisor.dev/gvisor/pkg/sync"
"gvisor.dev/gvisor/pkg/usermem"
)
// +stateify savable
type cpusetController struct {
controllerCommon
maxCpus uint32
maxMems uint32
mu sync.Mutex `state:"nosave"`
cpus *bitmap.Bitmap
mems *bitmap.Bitmap
}
var _ controller = (*cpusetController)(nil)
func newCPUSetController(k *kernel.Kernel, fs *filesystem) *cpusetController {
cores := uint32(k.ApplicationCores())
cpus := bitmap.New(cores)
cpus.FlipRange(0, cores)
mems := bitmap.New(1)
mems.FlipRange(0, 1)
c := &cpusetController{
cpus: &cpus,
mems: &mems,
maxCpus: uint32(k.ApplicationCores()),
maxMems: 1, // We always report a single NUMA node.
}
c.controllerCommon.init(controllerCPUSet, fs)
return c
}
// AddControlFiles implements controller.AddControlFiles.
func (c *cpusetController) AddControlFiles(ctx context.Context, creds *auth.Credentials, _ *cgroupInode, contents map[string]kernfs.Inode) {
contents["cpuset.cpus"] = c.fs.newControllerWritableFile(ctx, creds, &cpusData{c: c})
contents["cpuset.mems"] = c.fs.newControllerWritableFile(ctx, creds, &memsData{c: c})
}
// +stateify savable
type cpusData struct {
c *cpusetController
}
// Generate implements vfs.DynamicBytesSource.Generate.
func (d *cpusData) Generate(ctx context.Context, buf *bytes.Buffer) error {
d.c.mu.Lock()
defer d.c.mu.Unlock()
fmt.Fprintf(buf, "%s\n", formatBitmap(d.c.cpus))
return nil
}
// Write implements vfs.WritableDynamicBytesSource.Write.
func (d *cpusData) Write(ctx context.Context, src usermem.IOSequence, offset int64) (int64, error) {
src = src.DropFirst64(offset)
if src.NumBytes() > hostarch.PageSize {
return 0, linuxerr.EINVAL
}
t := kernel.TaskFromContext(ctx)
buf := t.CopyScratchBuffer(hostarch.PageSize)
n, err := src.CopyIn(ctx, buf)
if err != nil {
return 0, err
}
buf = buf[:n]
b, err := parseBitmap(string(buf), d.c.maxCpus)
if err != nil {
log.Warningf("cgroupfs cpuset controller: Failed to parse bitmap: %v", err)
return 0, linuxerr.EINVAL
}
if got, want := b.Maximum(), d.c.maxCpus; got > want {
log.Warningf("cgroupfs cpuset controller: Attempted to specify cpuset.cpus beyond highest available cpu: got %d, want %d", got, want)
return 0, linuxerr.EINVAL
}
d.c.mu.Lock()
defer d.c.mu.Unlock()
d.c.cpus = b
return int64(n), nil
}
// +stateify savable
type memsData struct {
c *cpusetController
}
// Generate implements vfs.DynamicBytesSource.Generate.
func (d *memsData) Generate(ctx context.Context, buf *bytes.Buffer) error {
d.c.mu.Lock()
defer d.c.mu.Unlock()
fmt.Fprintf(buf, "%s\n", formatBitmap(d.c.mems))
return nil
}
// Write implements vfs.WritableDynamicBytesSource.Write.
func (d *memsData) Write(ctx context.Context, src usermem.IOSequence, offset int64) (int64, error) {
src = src.DropFirst64(offset)
if src.NumBytes() > hostarch.PageSize {
return 0, linuxerr.EINVAL
}
t := kernel.TaskFromContext(ctx)
buf := t.CopyScratchBuffer(hostarch.PageSize)
n, err := src.CopyIn(ctx, buf)
if err != nil {
return 0, err
}
buf = buf[:n]
b, err := parseBitmap(string(buf), d.c.maxMems)
if err != nil {
log.Warningf("cgroupfs cpuset controller: Failed to parse bitmap: %v", err)
return 0, linuxerr.EINVAL
}
if got, want := b.Maximum(), d.c.maxMems; got > want {
log.Warningf("cgroupfs cpuset controller: Attempted to specify cpuset.mems beyond highest available node: got %d, want %d", got, want)
return 0, linuxerr.EINVAL
}
d.c.mu.Lock()
defer d.c.mu.Unlock()
d.c.mems = b
return int64(n), nil
}
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