Proc/Meminfo - Red Hat ENTERPRISE LINUX 4.5.0 Reference Manual

Chapter 5. The proc File System
This file remains in the same state as seen above unless a software RAID or
present. In that case, view
The file below shows a system with its
/proc/mdstat
it is currently re-syncing the disks:
Personalities : [linear] [raid1] read_ahead 1024 sectors md0: active raid1
sda2[1] sdb2[0] 9940 blocks [2/2] [UU] resync=1% finish=12.3min algorithm 2
[3/3] [UUU] unused devices: <none>
2.19.

/proc/meminfo

This is one of the more commonly used files in the
amount of valuable information about the systems RAM usage.
The following sample
MB of swap space:
MemTotal: 255908 kB MemFree: 69936 kB Buffers: 15812 kB Cached: 115124 kB
SwapCached: 0 kB Active: 92700 kB Inactive: 63792 kB HighTotal: 0 kB
HighFree: 0 kB LowTotal: 255908 kB LowFree: 69936 kB SwapTotal: 524280 kB
SwapFree: 524280 kB Dirty: 4 kB Writeback: 0 kB Mapped: 42236 kB Slab: 25912
kB Committed_AS: 118680 kB PageTables: 1236 kB VmallocTotal: 3874808 kB
VmallocUsed: 1416 kB VmallocChunk: 3872908 kB HugePages_Total: 0
HugePages_Free: 0 Hugepagesize: 4096 kB
Much of the information here is used by the
the command is similar in appearance to the contents and structure of
free
But by looking directly at
• — Total amount of physical RAM, in kilobytes.
MemTotal
• — The amount of physical RAM, in kilobytes, left unused by the system.
MemFree
• — The amount of physical RAM, in kilobytes, used for file buffers.
Buffers
• — The amount of physical RAM, in kilobytes, used as cache memory.
Cached
• — The amount of swap, in kilobytes, used as cache memory.
SwapCached
• — The total amount of buffer or page cache memory, in kilobytes, that is in active
Active
use. This is memory that has been recently used and is usually not reclaimed for other
purposes.
• — The total amount of buffer or page cache memory, in kilobytes, that are free and
Inactive
available. This is memory that has not been recently used and can be reclaimed for other
purposes.
58
to find the current status of
/proc/mdstat
virtual file is from a system with 256 MB of RAM and 512
/proc/meminfo
, more details are revealed:
/proc/meminfo
configured as a RAID 1 device, while
md0
directory, as it reports a large
/proc/
, , and commands. In fact, the output of
free top ps
device is
md
RAID devices.
mdX
/proc/meminfo
.