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Full Discussion: Re-start of RHEL server
Operating Systems Linux Red Hat Re-start of RHEL server Post 302779443 by DGPickett on Tuesday 12th of March 2013 04:25:11 PM
Old 03-12-2013
Memory is under VM mnagement, so it is no longer much of an issue. Sometimes excess paging is, or lack of swap space. Mostly, memory obsessions are left over from the trauma of primitive mainframe days. So many damaged souls!

Now on a 64 bit CPU you can mmap() a 100 TB file into your memory space and walk around in it like it was memory, which of course it is as you touch pages. In fact, you can seek up in an empty file 100 TB and write something to a page, and have a 1 page file. As you write the lower pages, the file allocation goes up. Hello sparse array! The rest of the space is generated null characters, if you read where you have not written.
 

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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The tunable is obsolete and has been removed.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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