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/proc/meminfo MemTotal =?

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/proc/meminfo MemTotal =?

/proc/meminfo总结起来有哪些要素MemTotal？

的例子tee /tmp/proc/meminfo < /proc/meminfo

MemTotal:        1279296 kB
MemFree:          164092 kB
Buffers:           62392 kB
Cached:           378116 kB
SwapCached:            0 kB
Active:           715176 kB
Inactive:         307800 kB
Active(anon):     583268 kB
Inactive(anon):     3384 kB
Active(file):     131908 kB
Inactive(file):   304416 kB
Unevictable:           0 kB
Mlocked:               0 kB
SwapTotal:             0 kB
SwapFree:              0 kB
Dirty:                44 kB
Writeback:             0 kB
AnonPages:        582480 kB
Mapped:           112904 kB
Shmem:              4192 kB
Slab:              47524 kB
SReclaimable:      33588 kB
SUnreclaim:        13936 kB
KernelStack:        1568 kB
PageTables:        12092 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:      639648 kB
Committed_AS:    1298132 kB
VmallocTotal:   34359738367 kB
VmallocUsed:       24012 kB
VmallocChunk:   34359696868 kB
HardwareCorrupted:     0 kB
AnonHugePages:     77824 kB
HugePages_Total:       0
HugePages_Free:        0
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB
DirectMap4k:        8832 kB
DirectMap2M:     1300480 kB

以下是帮助我检查不同配置的片段：

# Let's load them into CLI variables
all=$(sed 's!:[^0-9]\+!=!;s! kB!!;s![()]!_!g' /tmp/proc/meminfo) ; eval $all
# Let's make overview sorted by values (helps in tracking missing one)
echo $all | sed 's! !\n!g' | sort -n -k 2 -t '=' 
# Let's try Memtotal=MemFree+Active+Cached+Buffers ? (should be zero)
echo $[ $MemTotal - $MemFree - $Active - $Cached - $Buffers ]
# But gives -40480

我缺少什么？我应该对哪些元素/proc/meminfo求和才能得到MemTotal？

答案1

我不确定您需要的所有内容都已在/proc/meminfo的输出中公开，以便您可以MemTotal自己计算。来自Linux内核的文档proc.txt文件:

摘抄 
MemTotal: Total usable ram (i.e. physical ram minus a few reserved
          bits and the kernel binary code)

消息

如果您查看输出dmesg或日志文件，/var/log/dmesg您可以找到以下信息：

$ grep -E "total|Memory:.*available" /var/log/dmesg
[    0.000000] total RAM covered: 8064M
[    0.000000] On node 0 totalpages: 2044843
[    0.000000] Memory: 7970012k/9371648k available (4557k kernel code, 1192276k absent, 209360k reserved, 7251k data, 948k init)

相信这个信息可以用来判断MemTotal。这篇博文更详细地介绍了它，标题为：了解“vmalloc 区域重叠”。另外这篇文章提供了一些额外的信息，标题为：内存中程序的剖析。

参考

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