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// Copyright 2018 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 proc
import (
"bytes"
"fmt"
"gvisor.dev/gvisor/pkg/sentry/context"
"gvisor.dev/gvisor/pkg/sentry/fs/proc/seqfile"
"gvisor.dev/gvisor/pkg/sentry/kernel"
"gvisor.dev/gvisor/pkg/sentry/usage"
"gvisor.dev/gvisor/pkg/sentry/usermem"
)
// meminfoData backs /proc/meminfo.
//
// +stateify savable
type meminfoData struct {
// k is the owning Kernel.
k *kernel.Kernel
}
// NeedsUpdate implements seqfile.SeqSource.NeedsUpdate.
func (*meminfoData) NeedsUpdate(generation int64) bool {
return true
}
// ReadSeqFileData implements seqfile.SeqSource.ReadSeqFileData.
func (d *meminfoData) ReadSeqFileData(ctx context.Context, h seqfile.SeqHandle) ([]seqfile.SeqData, int64) {
if h != nil {
return nil, 0
}
mf := d.k.MemoryFile()
mf.UpdateUsage()
snapshot, totalUsage := usage.MemoryAccounting.Copy()
totalSize := usage.TotalMemory(mf.TotalSize(), totalUsage)
anon := snapshot.Anonymous + snapshot.Tmpfs
file := snapshot.PageCache + snapshot.Mapped
// We don't actually have active/inactive LRUs, so just make up numbers.
activeFile := (file / 2) &^ (usermem.PageSize - 1)
inactiveFile := file - activeFile
var buf bytes.Buffer
fmt.Fprintf(&buf, "MemTotal: %8d kB\n", totalSize/1024)
memFree := (totalSize - totalUsage) / 1024
// We use MemFree as MemAvailable because we don't swap.
// TODO(rahat): When reclaim is implemented the value of MemAvailable
// should change.
fmt.Fprintf(&buf, "MemFree: %8d kB\n", memFree)
fmt.Fprintf(&buf, "MemAvailable: %8d kB\n", memFree)
fmt.Fprintf(&buf, "Buffers: 0 kB\n") // memory usage by block devices
fmt.Fprintf(&buf, "Cached: %8d kB\n", (file+snapshot.Tmpfs)/1024)
// Emulate a system with no swap, which disables inactivation of anon pages.
fmt.Fprintf(&buf, "SwapCache: 0 kB\n")
fmt.Fprintf(&buf, "Active: %8d kB\n", (anon+activeFile)/1024)
fmt.Fprintf(&buf, "Inactive: %8d kB\n", inactiveFile/1024)
fmt.Fprintf(&buf, "Active(anon): %8d kB\n", anon/1024)
fmt.Fprintf(&buf, "Inactive(anon): 0 kB\n")
fmt.Fprintf(&buf, "Active(file): %8d kB\n", activeFile/1024)
fmt.Fprintf(&buf, "Inactive(file): %8d kB\n", inactiveFile/1024)
fmt.Fprintf(&buf, "Unevictable: 0 kB\n") // TODO(b/31823263)
fmt.Fprintf(&buf, "Mlocked: 0 kB\n") // TODO(b/31823263)
fmt.Fprintf(&buf, "SwapTotal: 0 kB\n")
fmt.Fprintf(&buf, "SwapFree: 0 kB\n")
fmt.Fprintf(&buf, "Dirty: 0 kB\n")
fmt.Fprintf(&buf, "Writeback: 0 kB\n")
fmt.Fprintf(&buf, "AnonPages: %8d kB\n", anon/1024)
fmt.Fprintf(&buf, "Mapped: %8d kB\n", file/1024) // doesn't count mapped tmpfs, which we don't know
fmt.Fprintf(&buf, "Shmem: %8d kB\n", snapshot.Tmpfs/1024)
return []seqfile.SeqData{{Buf: buf.Bytes(), Handle: (*meminfoData)(nil)}}, 0
}
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