78 lines
3.1 KiB
Go
78 lines
3.1 KiB
Go
// Copyright 2019 The gVisor Authors.
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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.dev/gvisor/pkg/sentry/context"
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"gvisor.dev/gvisor/pkg/sentry/kernel"
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"gvisor.dev/gvisor/pkg/sentry/usage"
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"gvisor.dev/gvisor/pkg/sentry/usermem"
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"gvisor.dev/gvisor/pkg/sentry/vfs"
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)
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// meminfoData implements vfs.DynamicBytesSource for /proc/meminfo.
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//
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// +stateify savable
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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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var _ vfs.DynamicBytesSource = (*meminfoData)(nil)
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// Generate implements vfs.DynamicBytesSource.Generate.
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func (d *meminfoData) Generate(ctx context.Context, buf *bytes.Buffer) error {
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mf := d.k.MemoryFile()
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mf.UpdateUsage()
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snapshot, totalUsage := usage.MemoryAccounting.Copy()
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totalSize := usage.TotalMemory(mf.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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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(rahat): 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(b/31823263)
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fmt.Fprintf(buf, "Mlocked: 0 kB\n") // TODO(b/31823263)
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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 nil
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}
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