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Subject[RFC] why the amount of cache from "free -m" and /proc/meminfo are different?
[root@localhost ~]# free -m
total used free shared buff/cache available
Mem: 48295 574 41658 8 6062 46344
Swap: 24191 0 24191

[root@localhost ~]# cat /proc/meminfo
MemTotal: 49454896 kB
MemFree: 42658360 kB
MemAvailable: 47456052 kB
Buffers: 0 kB
Cached: 3727824 kB
SwapCached: 0 kB
Active: 2010196 kB
Inactive: 1784204 kB
Active(anon): 66612 kB
Inactive(anon): 8948 kB
Active(file): 1943584 kB
Inactive(file): 1775256 kB
Unevictable: 0 kB
Mlocked: 0 kB
SwapTotal: 24772604 kB
SwapFree: 24772604 kB
Dirty: 0 kB
Writeback: 0 kB
AnonPages: 66672 kB
Mapped: 38440 kB
Shmem: 8984 kB
Slab: 2480092 kB
SReclaimable: 1291500 kB
SUnreclaim: 1188592 kB
KernelStack: 4480 kB
PageTables: 4928 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 49500052 kB
Committed_AS: 254220 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 0 kB
VmallocChunk: 0 kB
HardwareCorrupted: 0 kB
AnonHugePages: 18432 kB
HugePages_Total: 0
HugePages_Free: 0
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 2048 kB
DirectMap4k: 140864 kB
DirectMap2M: 5093376 kB
DirectMap1G: 47185920 kB

[root@localhost ~]# uname -a
Linux localhost.localdomain 4.5.0-rc1-0.1-default+ #4 SMP Sat Jan 30 05:38:10 EST 2016 x86_64 x86_64 x86_64 GNU/Linux

[root@localhost ~]# rpm -qa | grep procps
procps-ng-3.3.10-3.el7.x86_64

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