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relationship or difference between entitled memory and locked memory


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relationship or difference between entitled memory and locked memory

Hello solaris experts,

Being new to solaris containers, from Linux, feeling difficulty in understanding certain concepts. Hope somebody can help me here.


I understand that, & some questions ....
  • Locked memory -- memory which will not be swapped out at any cause.
    • is this for individual zones ? or ?
  • Entitled memory -- memory that is allocated to a zone.
    • no other zone / global zone can use that, even that particular zone is not using that part of memory ?
    • if memory is entitled, that particular zone cannot access beyond that ?
    • if memory is not entitled, it can occupy as much as possible from global zone ?
What is the relationship between entitled memory and locked memory in solaris containers ?
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mlockall(3C)						   Standard C Library Functions 					      mlockall(3C)

NAME
mlockall, munlockall - lock or unlock address space
SYNOPSIS
#include <sys/mman.h> int mlockall(int flags); int munlockall(void);
DESCRIPTION
The mlockall() function locks in memory all pages mapped by an address space. The value of flags determines whether the pages to be locked are those currently mapped by the address space, those that will be mapped in the future, or both: MCL_CURRENT Lock current mappings MCL_FUTURE Lock future mappings If MCL_FUTURE is specified for mlockall(), mappings are locked as they are added to the address space (or replace existing mappings), pro- vided sufficient memory is available. Locking in this manner is not persistent across the exec family of functions (see exec(2)). Mappings locked using mlockall() with any option may be explicitly unlocked with a munlock() call (see mlock(3C)). The munlockall() function removes address space locks and locks on mappings in the address space. All conditions and constraints on the use of locked memory that apply to mlock(3C) also apply to mlockall(). Locks established with mlockall() are not inherited by a child process after a fork(2) call, and are not nested.
RETURN VALUES
Upon successful completion, the mlockall() and munlockall() functions return 0. Otherwise, they return -1 and set errno to indicate the error.
ERRORS
The mlockall() and munlockall() functions will fail if: EAGAIN Some or all of the memory in the address space could not be locked due to sufficient resources. This error condition applies to mlockall() only. EINVAL The flags argument contains values other than MCL_CURRENT and MCL_FUTURE. EPERM The {PRIV_PROC_LOCK_MEMORY} privilege is not asserted in the effective set of the calling process.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+
SEE ALSO
exec(2), fork(2), memcntl(2), mmap(2), plock(3C), mlock(3C), sysconf(3C), attributes(5), standards(5) SunOS 5.10 22 Mar 2004 mlockall(3C)

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