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module Vmstat
# Gathered memory data snapshot.
# @attr [Fixnum] pagesize
# The page size of the memory in bytes.
# @attr [Fixnum] wired
# The number of wired pages in the system.
# @attr [Fixnum] active
# The number of active pages in the system.
# @attr [Fixnum] inactive
# The number of inactive pages in the system.
# @attr [Fixnum] free
# The number of free pages in the system.
# @attr [Fixnum] pageins
# The number of pageins.
# @attr [Fixnum] pageouts
# The number of pageouts.
class Memory < Struct.new(:pagesize, :wired, :active, :inactive, :free,
:pageins, :pageouts)
# Calculate the wired bytes based of the wired pages.
# @return [Fixnum] wired bytes
def wired_bytes
wired * pagesize
end
# Calculate the active bytes based of the active pages.
# @return [Fixnum] active bytes
def active_bytes
active * pagesize
end
# Calculate the inactive bytes based of the inactive pages.
# @return [Fixnum] inactive bytes
def inactive_bytes
inactive * pagesize
end
# Calculate the free bytes based of the free pages.
# @return [Fixnum] free bytes
def free_bytes
free * pagesize
end
# Calculate the total bytes based of all pages
# @return [Fixnum] total bytes
def total_bytes
(wired + active + inactive + free) * pagesize
end
end
# @attr [Fixnum] available
# The estimated available memory (linux)
# See: https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=34e431b0ae398fc54ea69ff85ec700722c9da773
class LinuxMemory < Memory
attr_accessor :available
# Calculate the available bytes based of the active pages.
# @return [Fixnum] active bytes
def available_bytes
available * pagesize
end
end
end
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