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vmstat – reports virtual memory statistics.
Page-ins – when pages are returned to physical memory, the event is called a page-in.
Page-outs – when the kernel detects that memory is running low, it attempts to free up memory by paging out.
when pages are written to disk, the event is called a page-out.

vmstat, delay 5 seconds, count 10

# vmstat 5 10
procs                      memory    swap          io     system cpu
r  b  w   swpd   free  buff cache  si  so   bi   bo   in    cs us  sy  id

free column = amount of free memory
si = page-ins
so = page-outs

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