Operation Manual

SwapCached
Page cache in swap
Active
Recently used memory that normally is not reclaimed. This value is the sum of
memory claimed by anonymous pages (listed as Active(anon)) and le-backed
pages (listed as Active(le))
Inactive
Recently unused memory that can be reclaimed. This value is the sum of memory
claimed by anonymous pages (listed as Inactive(anon)) and le-backed pages
(listed as Inactive(le)).
SwapTotal
Total amount of swap space
SwapFree
Total amount of unused swap space
Dirty
Amount of memory that will be written to disk
Writeback
Amount of memory that currently is written to disk
Mapped
Memory claimed with the nmap command
Slab
Kernel data structure cache
Committed_AS
An approximation of the total amount of memory (RAM plus swap) the current
workload needs in the worst case.
13.4.3 Process Memory Usage: smaps
Exactly determining how much memory a certain process is consuming is not possible
with standard tools like top or ps. Use the smaps subsystem, introduced in Kernel
2.6.14, if you need exact data. It can be found at /proc/pid/smaps and shows you
System Monitoring Utilities 193