Page 59 - slides.dvi

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Operating
VM
Also
to
Virtual
Virtual
Virtual
such
Systems
get
already
—
impunity
programs
processes
efficiency:
typically
execute
portability:
pages
referenced.
a
have
convenience:
Demand
memory
no
demand
live
Memory
addressing
access
Paged
valid
on
need
(VM)
a
process
or
programs
Virtual
to
allows
(executables)
has
implemented
we
us
a
programmer
Memory
work
via
invalid
waste
to
load
non-resident
reside
segmentation,
can
non-volatile
on
number
but
use
(real)
pages;
pages
demand
of
regardless
disk
in
memory
introduce
e.g.
rare.
of
backing
on
the
just
memory
paging:
large
how
introduce
as
benefits:
on
idea
a
store,
if
it
of
demand
much
sparse
;
code
new
such
or
i.e.
were
as
data
virtual
a
as
actual
data
‘the
and
real
which
memory:
memory
structures
“non-resident”
hard-disk.
when
isn’t
thing’.
with
they
present
are
used.
designation
55