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Full Discussion: Monitoring Paging and Swapping
Operating Systems Solaris Monitoring Paging and Swapping Post 303027403 by jlliagre on Friday 14th of December 2018 05:11:03 PM
Old 12-14-2018
Yes, a process needs not to steal memory from another process given the fact that for it to be able to use memory, it first needs to perform a successful allocation.

A process only deals with virtual memory. Memory allocated with malloc or mmap is by definition always contiguous in the process virtual space (it has an address and a size). Malloc can use brk or mmap system call to get space. Malloc'd areas might be anywhere in the process virtual space. When this virtual space is fragmented and limited (32 bit processes), a large allocation might fail even if smaller than the sum of total free space.

Contiguous virtual memory pages are mapped to physical pages. The latter don't have to be physically contiguous. That wouldn't make sense as physical pages can be on RAM and later on disk and later again, somewhere else on RAM.

A process virtual space is unrelated to another process virtual space, the same addresses can be used on either side but map to different physical pages.
 

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LEARN ABOUT HPUX

unlockable_mem

unlockable_mem(5)						     OBSOLETE							 unlockable_mem(5)

NAME

       unlockable_mem - OBSOLETE kernel tunable parameter

DESCRIPTION

       The tunable is obsolete and has been removed.

       Memory  locking	allows the privileged user to specify which pages need to remain in memory, and unaffected by the swap process.  This fea-
       ture allows you to ensure that memory access times are unaffected by delays introduced by memory paging and swapping.  For example, locking
       is  a  tool  provided  to privileged users on a system that is short on physical memory.  Instead of having these privileged processes swap
       like the rest of the processes, they can lock portions of their address space.  Once the pages are locked in for the privileged	processes,
       they will no longer have to worry about memory contention.  The unprivileged processes however, will have to compete for memory.

       provides you with a limiting factor on this privileged behavior, by setting the amount of memory which cannot be locked by user processes.

WARNINGS

       Installation  of  optional  kernel  software, from HP or other vendors, may cause changes to tunable parameter values.  After installation,
       some tunable parameters may no longer be at the default or recommended values.  For information about the effects of installation  on  tun-
       able  values,  consult  the documentation for the kernel software being installed.  For information about optional kernel software that was
       factory installed on your system, see at

AUTHOR

       was developed by HP.

							     Tunable Kernel Parameters						 unlockable_mem(5)
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