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It's a common dilemma: I just got a brand new Linux machine, loaded it up with lots of expensive RAM, and left it for a day. Now, it's out of memory, or it is swapping! It definitely has enough RAM, so there must be a bug in Linux!I assure you, in almost all cases, your system has plenty of RAM. However, where is all of that RAM going? For what does Linux use all of it? How can I actually tell tha
This page describes the Split LRU page replacement design by Rik van Riel, Lee Schermerhorn, Kosaki Motohiro and others. It was merged in the 2.6.28 kernel and has continued to receive fixes and refinements until it started working really well, around 2.6.32. The tracking of recently reclaimed pages has not been integrated yet, a simpler way of sizing the various LRU lists was implemented. The pro
The functions, code excerpts and comments discussed below here are from mm/oom_kill.c unless otherwise noted. It is the job of the linux 'oom killer' to sacrifice one or more processes in order to free up memory for the system when all else fails. It will also kill any process sharing the same mm_struct as the selected process, for obvious reasons. Any particular process leader may be immunized ag
Linux-mm.org is a wiki for documenting how memory management works and for coordinating new memory management development projects. Please help editing this wiki. Thank you. Documentation LinuxMMDocumentation contains information on how to tweak the Linux kernel memory management subsystem. LinuxMMInternals explains how some of the Linux kernel memory management works. Community To subscribe to th
Kernels 2.6.16 and newer provide a mechanism to have the kernel drop the page cache and/or inode and dentry caches on command, which can help free up a lot of memory. Now you can throw away that script that allocated a ton of memory just to get rid of the cache... To use /proc/sys/vm/drop_caches, just echo a number to it. To free pagecache: # echo 1 > /proc/sys/vm/drop_cachesTo free dentries and i
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