What does "zero" imply in "pmap -x" output?

Solution Unverified - Updated -

Issue

  • What does "zero" imply in "pmap -x" output?
  • Under "Mapping" column there are lots of "zero" entries.
15709:   oracle
Address           Kbytes     RSS   Dirty Mode   Mapping
00002aaaacd07000     960      24      20 rw---  zero
00002aaaacdf7000     384      24      20 rw---  zero
00002aaaace57000     192     184     176 rw---  zero
00002aaaace87000     192     192     192 rw---  zero
00002aaaaceb7000     192     192     192 rw---  zero
00002aaaacee7000      64      64       0 rw---  zero
00002aaaacef7000      64      52      52 rw---  zero
00002aaaacf07000   67264      20      12 rw---  zero
00002aaab10b7000     192     192     192 rw---  zero
00002aaab10e7000     192     192     192 rw---  zero
00002aaab1117000     192     192     192 rw---  zero
                              ^                   ^
                              +---[MEM in KB]     +------------[zero entry under MAPPING]

Environment

  • Red Hat Enterprise Linux 5.8

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