1 files changed, 56 insertions, 0 deletions
diff --git a/pkg/sentry/fsimpl/cgroupfs/cpu.go b/pkg/sentry/fsimpl/cgroupfs/cpu.go
new file mode 100644
index 000000000..4641d613c
--- /dev/null
+++ b/pkg/sentry/fsimpl/cgroupfs/cpu.go
@@ -0,0 +1,56 @@
+// 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 (
+	"fmt"
+
+	"gvisor.dev/gvisor/pkg/abi/linux"
+	"gvisor.dev/gvisor/pkg/context"
+	"gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs"
+	"gvisor.dev/gvisor/pkg/sentry/kernel/auth"
+)
+
+// +stateify savable
+type cpuController struct {
+	controllerCommon
+
+	// CFS bandwidth control parameters, values in microseconds.
+	cfsPeriod uint64
+	cfsQuota  int64
+
+	// CPU shares, values should be (num core * 1024).
+	shares uint64
+}
+
+var _ controller = (*cpuController)(nil)
+
+func newCPUController(fs *filesystem) *cpuController {
+	// Default values for controller parameters from Linux.
+	c := &cpuController{
+		cfsPeriod: 100000,
+		cfsQuota:  -1,
+		shares:    1024,
+	}
+	c.controllerCommon.init(controllerCPU, fs)
+	return c
+}
+
+// AddControlFiles implements controller.AddControlFiles.
+func (c *cpuController) AddControlFiles(ctx context.Context, creds *auth.Credentials, _ *cgroupInode, contents map[string]kernfs.Inode) {
+	contents["cpu.cfs_period_us"] = c.fs.newStaticControllerFile(ctx, creds, linux.FileMode(0644), fmt.Sprintf("%d\n", c.cfsPeriod))
+	contents["cpu.cfs_quota_us"] = c.fs.newStaticControllerFile(ctx, creds, linux.FileMode(0644), fmt.Sprintf("%d\n", c.cfsQuota))
+	contents["cpu.shares"] = c.fs.newStaticControllerFile(ctx, creds, linux.FileMode(0644), fmt.Sprintf("%d\n", c.shares))
+}