83 lines
3.3 KiB
Go
83 lines
3.3 KiB
Go
// Copyright 2018 Google Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package proc
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import (
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"bytes"
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"fmt"
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"gvisor.googlesource.com/gvisor/pkg/sentry/fs/proc/seqfile"
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"gvisor.googlesource.com/gvisor/pkg/sentry/kernel"
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"gvisor.googlesource.com/gvisor/pkg/sentry/usage"
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"gvisor.googlesource.com/gvisor/pkg/sentry/usermem"
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)
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// meminfoData backs /proc/meminfo.
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type meminfoData struct {
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// k is the owning Kernel.
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k *kernel.Kernel
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}
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// NeedsUpdate implements seqfile.SeqSource.NeedsUpdate.
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func (*meminfoData) NeedsUpdate(generation int64) bool {
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return true
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}
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// ReadSeqFileData implements seqfile.SeqSource.ReadSeqFileData.
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func (d *meminfoData) ReadSeqFileData(h seqfile.SeqHandle) ([]seqfile.SeqData, int64) {
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if h != nil {
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return nil, 0
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}
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mem := d.k.Platform.Memory()
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mem.UpdateUsage()
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snapshot, totalUsage := usage.MemoryAccounting.Copy()
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totalSize := usage.TotalMemory(mem.TotalSize(), totalUsage)
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anon := snapshot.Anonymous + snapshot.Tmpfs
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file := snapshot.PageCache + snapshot.Mapped
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// We don't actually have active/inactive LRUs, so just make up numbers.
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activeFile := (file / 2) &^ (usermem.PageSize - 1)
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inactiveFile := file - activeFile
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var buf bytes.Buffer
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fmt.Fprintf(&buf, "MemTotal: %8d kB\n", totalSize/1024)
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memFree := (totalSize - totalUsage) / 1024
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// We use MemFree as MemAvailable because we don't swap.
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// TODO: When reclaim is implemented the value of MemAvailable
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// should change.
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fmt.Fprintf(&buf, "MemFree: %8d kB\n", memFree)
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fmt.Fprintf(&buf, "MemAvailable: %8d kB\n", memFree)
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fmt.Fprintf(&buf, "Buffers: 0 kB\n") // memory usage by block devices
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fmt.Fprintf(&buf, "Cached: %8d kB\n", (file+snapshot.Tmpfs)/1024)
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// Emulate a system with no swap, which disables inactivation of anon pages.
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fmt.Fprintf(&buf, "SwapCache: 0 kB\n")
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fmt.Fprintf(&buf, "Active: %8d kB\n", (anon+activeFile)/1024)
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fmt.Fprintf(&buf, "Inactive: %8d kB\n", inactiveFile/1024)
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fmt.Fprintf(&buf, "Active(anon): %8d kB\n", anon/1024)
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fmt.Fprintf(&buf, "Inactive(anon): 0 kB\n")
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fmt.Fprintf(&buf, "Active(file): %8d kB\n", activeFile/1024)
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fmt.Fprintf(&buf, "Inactive(file): %8d kB\n", inactiveFile/1024)
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fmt.Fprintf(&buf, "Unevictable: 0 kB\n") // TODO
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fmt.Fprintf(&buf, "Mlocked: 0 kB\n") // TODO
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fmt.Fprintf(&buf, "SwapTotal: 0 kB\n")
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fmt.Fprintf(&buf, "SwapFree: 0 kB\n")
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fmt.Fprintf(&buf, "Dirty: 0 kB\n")
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fmt.Fprintf(&buf, "Writeback: 0 kB\n")
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fmt.Fprintf(&buf, "AnonPages: %8d kB\n", anon/1024)
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fmt.Fprintf(&buf, "Mapped: %8d kB\n", file/1024) // doesn't count mapped tmpfs, which we don't know
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fmt.Fprintf(&buf, "Shmem: %8d kB\n", snapshot.Tmpfs/1024)
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return []seqfile.SeqData{{Buf: buf.Bytes(), Handle: (*meminfoData)(nil)}}, 0
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}
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