Actually, my mlock(2) man page says:
EPERM (Linux 2.6.9 and later) the caller was not privileged
(CAP_IPC_LOCK) and
its RLIMIT_MEMLOCK soft resource limit was 0.
EPERM (Linux 2.6.8 and earlier) The calling process has insufficient
privilege
to call munlockall. Under Linux the CAP_IPC_LOCK capability is
required.
so I guess the change was made in version 2.6.9.
- R.
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