linux-kernel – 如何在 procmeminfo中计算MemTotal

概述当我cat / proc / meminfo时,报告如下： MemTotal: 2034284 kBMemFree: 1432728 kBBuffers: 16568 kBCached: 324864 kBSwapCached: 0 kBActive: 307344 kBIn 当我cat / proc / meminfo时,报告如下：

MemTotal:        2034284 kBMemFree:         1432728 kBBuffers:           16568 kBCached:           324864 kBSwapCached:            0 kBActive:           307344 kBInactive:         256916 kBActive(anon):     223020 kBInactive(anon):    74372 kBActive(file):      84324 kBInactive(file):   182544 kBUnevictable:           0 kBmlocked:               0 kBHighTotal:       1152648 kBHighFree:         600104 kBLowTotal:         881636 kBLowFree:          832624 kBSwapTotal:       4200960 kBSwapFree:        4200960 kBDirty:                60 kBWriteback:             0 kBAnonPages:        222868 kBMapped:            80596 kBShmem:             74564 kBSlab:              24268 kBSReclaimable:      14024 kBSUnreclaim:        10244 kBKernelStack:        1672 kBPagetables:         2112 kBNFS_Unstable:          0 kBBounce:                0 kBWritebackTmp:          0 kBCommitlimit:     5218100 kBCommitted_AS:     833352 kBVmallocTotal:     122880 kBVmallocUsed:       13916 kBVmallocChunk:      50540 kBHugePages_Total:       0HugePages_Free:        0HugePages_Rsvd:        0HugePages_Surp:        0Hugepagesize:       4096 kBDirectMap4k:       20472 kBDirectMap4M:      888832 kB

我有一个公式来计算Memtotal：

Memtotal = MemFree Cached Active Inactive Mapped Shmem Slab Pagetables VmallocUsed

但我不知道公式是否正确,任何人都可以帮助澄清它？

解决方法 我认为很难达到meminfo的确切值(基于总内存验证的加法).
尽管如此,在我看来,接下来应该会让你接近TotalMemory数字.

TotalMemory = MemFree Buffers Cached Dirty AnonPages Slab VmAllocUsed

在您的示例中
1432728 16568 324864 60 222868 24268 13916 = 2035272
一些参考：
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/Documentation/filesystems/proc.txt?id=HEAD#l451(来自上面建议的另一个stackoverflow文章)除此之外,我认为波动是因为VmAllocUsed.

总结

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