mirror of
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278 lines
8.0 KiB
Go
278 lines
8.0 KiB
Go
// Copyright 2019 The Prometheus Authors
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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 procfs
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import (
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"bufio"
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"bytes"
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"fmt"
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"io"
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"strconv"
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"strings"
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"github.com/prometheus/procfs/internal/util"
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)
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// Meminfo represents memory statistics.
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type Meminfo struct {
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// Total usable ram (i.e. physical ram minus a few reserved
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// bits and the kernel binary code)
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MemTotal uint64
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// The sum of LowFree+HighFree
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MemFree uint64
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// An estimate of how much memory is available for starting
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// new applications, without swapping. Calculated from
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// MemFree, SReclaimable, the size of the file LRU lists, and
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// the low watermarks in each zone. The estimate takes into
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// account that the system needs some page cache to function
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// well, and that not all reclaimable slab will be
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// reclaimable, due to items being in use. The impact of those
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// factors will vary from system to system.
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MemAvailable uint64
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// Relatively temporary storage for raw disk blocks shouldn't
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// get tremendously large (20MB or so)
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Buffers uint64
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Cached uint64
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// Memory that once was swapped out, is swapped back in but
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// still also is in the swapfile (if memory is needed it
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// doesn't need to be swapped out AGAIN because it is already
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// in the swapfile. This saves I/O)
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SwapCached uint64
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// Memory that has been used more recently and usually not
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// reclaimed unless absolutely necessary.
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Active uint64
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// Memory which has been less recently used. It is more
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// eligible to be reclaimed for other purposes
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Inactive uint64
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ActiveAnon uint64
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InactiveAnon uint64
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ActiveFile uint64
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InactiveFile uint64
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Unevictable uint64
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Mlocked uint64
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// total amount of swap space available
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SwapTotal uint64
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// Memory which has been evicted from RAM, and is temporarily
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// on the disk
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SwapFree uint64
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// Memory which is waiting to get written back to the disk
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Dirty uint64
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// Memory which is actively being written back to the disk
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Writeback uint64
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// Non-file backed pages mapped into userspace page tables
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AnonPages uint64
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// files which have been mapped, such as libraries
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Mapped uint64
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Shmem uint64
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// in-kernel data structures cache
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Slab uint64
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// Part of Slab, that might be reclaimed, such as caches
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SReclaimable uint64
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// Part of Slab, that cannot be reclaimed on memory pressure
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SUnreclaim uint64
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KernelStack uint64
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// amount of memory dedicated to the lowest level of page
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// tables.
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PageTables uint64
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// NFS pages sent to the server, but not yet committed to
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// stable storage
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NFSUnstable uint64
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// Memory used for block device "bounce buffers"
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Bounce uint64
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// Memory used by FUSE for temporary writeback buffers
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WritebackTmp uint64
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// Based on the overcommit ratio ('vm.overcommit_ratio'),
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// this is the total amount of memory currently available to
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// be allocated on the system. This limit is only adhered to
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// if strict overcommit accounting is enabled (mode 2 in
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// 'vm.overcommit_memory').
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// The CommitLimit is calculated with the following formula:
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// CommitLimit = ([total RAM pages] - [total huge TLB pages]) *
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// overcommit_ratio / 100 + [total swap pages]
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// For example, on a system with 1G of physical RAM and 7G
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// of swap with a `vm.overcommit_ratio` of 30 it would
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// yield a CommitLimit of 7.3G.
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// For more details, see the memory overcommit documentation
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// in vm/overcommit-accounting.
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CommitLimit uint64
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// The amount of memory presently allocated on the system.
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// The committed memory is a sum of all of the memory which
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// has been allocated by processes, even if it has not been
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// "used" by them as of yet. A process which malloc()'s 1G
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// of memory, but only touches 300M of it will show up as
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// using 1G. This 1G is memory which has been "committed" to
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// by the VM and can be used at any time by the allocating
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// application. With strict overcommit enabled on the system
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// (mode 2 in 'vm.overcommit_memory'),allocations which would
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// exceed the CommitLimit (detailed above) will not be permitted.
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// This is useful if one needs to guarantee that processes will
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// not fail due to lack of memory once that memory has been
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// successfully allocated.
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CommittedAS uint64
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// total size of vmalloc memory area
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VmallocTotal uint64
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// amount of vmalloc area which is used
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VmallocUsed uint64
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// largest contiguous block of vmalloc area which is free
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VmallocChunk uint64
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HardwareCorrupted uint64
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AnonHugePages uint64
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ShmemHugePages uint64
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ShmemPmdMapped uint64
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CmaTotal uint64
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CmaFree uint64
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HugePagesTotal uint64
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HugePagesFree uint64
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HugePagesRsvd uint64
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HugePagesSurp uint64
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Hugepagesize uint64
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DirectMap4k uint64
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DirectMap2M uint64
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DirectMap1G uint64
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}
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// Meminfo returns an information about current kernel/system memory statistics.
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// See https://www.kernel.org/doc/Documentation/filesystems/proc.txt
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func (fs FS) Meminfo() (Meminfo, error) {
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b, err := util.ReadFileNoStat(fs.proc.Path("meminfo"))
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if err != nil {
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return Meminfo{}, err
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}
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m, err := parseMemInfo(bytes.NewReader(b))
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if err != nil {
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return Meminfo{}, fmt.Errorf("failed to parse meminfo: %v", err)
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}
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return *m, nil
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}
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func parseMemInfo(r io.Reader) (*Meminfo, error) {
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var m Meminfo
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s := bufio.NewScanner(r)
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for s.Scan() {
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// Each line has at least a name and value; we ignore the unit.
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fields := strings.Fields(s.Text())
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if len(fields) < 2 {
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return nil, fmt.Errorf("malformed meminfo line: %q", s.Text())
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}
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v, err := strconv.ParseUint(fields[1], 0, 64)
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if err != nil {
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return nil, err
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}
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switch fields[0] {
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case "MemTotal:":
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m.MemTotal = v
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case "MemFree:":
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m.MemFree = v
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case "MemAvailable:":
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m.MemAvailable = v
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case "Buffers:":
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m.Buffers = v
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case "Cached:":
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m.Cached = v
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case "SwapCached:":
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m.SwapCached = v
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case "Active:":
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m.Active = v
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case "Inactive:":
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m.Inactive = v
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case "Active(anon):":
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m.ActiveAnon = v
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case "Inactive(anon):":
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m.InactiveAnon = v
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case "Active(file):":
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m.ActiveFile = v
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case "Inactive(file):":
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m.InactiveFile = v
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case "Unevictable:":
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m.Unevictable = v
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case "Mlocked:":
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m.Mlocked = v
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case "SwapTotal:":
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m.SwapTotal = v
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case "SwapFree:":
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m.SwapFree = v
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case "Dirty:":
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m.Dirty = v
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case "Writeback:":
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m.Writeback = v
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case "AnonPages:":
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m.AnonPages = v
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case "Mapped:":
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m.Mapped = v
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case "Shmem:":
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m.Shmem = v
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case "Slab:":
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m.Slab = v
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case "SReclaimable:":
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m.SReclaimable = v
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case "SUnreclaim:":
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m.SUnreclaim = v
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case "KernelStack:":
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m.KernelStack = v
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case "PageTables:":
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m.PageTables = v
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case "NFS_Unstable:":
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m.NFSUnstable = v
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case "Bounce:":
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m.Bounce = v
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case "WritebackTmp:":
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m.WritebackTmp = v
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case "CommitLimit:":
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m.CommitLimit = v
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case "Committed_AS:":
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m.CommittedAS = v
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case "VmallocTotal:":
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m.VmallocTotal = v
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case "VmallocUsed:":
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m.VmallocUsed = v
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case "VmallocChunk:":
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m.VmallocChunk = v
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case "HardwareCorrupted:":
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m.HardwareCorrupted = v
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case "AnonHugePages:":
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m.AnonHugePages = v
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case "ShmemHugePages:":
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m.ShmemHugePages = v
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case "ShmemPmdMapped:":
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m.ShmemPmdMapped = v
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case "CmaTotal:":
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m.CmaTotal = v
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case "CmaFree:":
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m.CmaFree = v
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case "HugePages_Total:":
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m.HugePagesTotal = v
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case "HugePages_Free:":
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m.HugePagesFree = v
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case "HugePages_Rsvd:":
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m.HugePagesRsvd = v
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case "HugePages_Surp:":
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m.HugePagesSurp = v
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case "Hugepagesize:":
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m.Hugepagesize = v
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case "DirectMap4k:":
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m.DirectMap4k = v
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case "DirectMap2M:":
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m.DirectMap2M = v
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case "DirectMap1G:":
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m.DirectMap1G = v
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}
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}
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return &m, nil
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}
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