linux - Total available physical memory from /proc/meminfo not adding up -


i'm trying account available physical memory on linux box through /proc/meminfo (output provided below). accounting current free memory, user-space physical usage, kernel data structures including vmalloc-ed, huge pages etc i'm coming short ~5 gb. meminfo gives me @ moment:

cat /proc/meminfo

memtotal: 362816744 kb

memfree: 2230348 kb

buffers: 433636 kb

cached: 814628 kb

swapcached: 20688 kb

active: 723172 kb

inactive: 539364 kb

active(anon): 369736 kb

inactive(anon): 14936 kb

active(file): 353436 kb

inactive(file): 524428 kb

unevictable: 2080 kb

noswap 292435456 kb

mlocked: 2080 kb

swaptotal: 4190964 kb

swapfree: 4072560 kb

dirty: 640 kb

writeback: 0 kb

anonpages: 292440380 kb

mapped: 144904 kb

shmem: 129772 kb

slab: 568552 kb

sreclaimable: 483816 kb

sunreclaim: 84736 kb

kernelstack: 13776 kb

pagetables: 785532 kb

nfs_unstable: 0 kb

bounce: 0 kb

writebacktmp: 0 kb

commitlimit: 156197224 kb

committed_as: 402420112 kb

vmalloctotal: 34359738367 kb

vmallocused: 17872740 kb

vmallocchunk: 34142133244 kb

hardwarecorrupted: 0 kb

hugepages_total: 28713

hugepages_free: 14352

hugepages_rsvd: 0

hugepages_surp: 0

hugepagesize: 2048 kb

directmap4k: 6144 kb

directmap2m: 2017280 kb

directmap1g: 367001600 kb

how accounted current memory state: memfree + buffers + cached + swapcached + anonpages + mapped + slab + kernelstack + pagetables + vmalloced memory + huge pages

since vmallocused throws memory usage of external physical devices remapped (using ioremap) in addition physical memory, actual physical memory component did following:

echo "( $(cat /proc/vmallocinfo | grep vmalloc | awk '{print $2}' | paste -s -d "+") )/ 1024" | bc

reference: http://enakai00.hatenablog.com/entry/20110906/1315315488

so vmalloc physical memory consumption works out 826376 kb.

huge pages = 28713 * 2048 kb = 58804224 kb

with this, i'm coming ~ 5g worth of unaccounted-for memory (comparing memtotal).

if there have not accounted here , explain gap, please let me know.


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