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- Kernel_same-page_merging abstract "Kernel same-page merging (abbreviated to KSM, and also known as kernel shared memory or memory merging) lets the hypervisor system share identical memory pages amongst different processes or virtualized guests. While not directly linked, KVM can use KSM to merge memory pages occupied by virtual machines.This is done by scanning through the memory finding duplicate pages. The duplicate pair is then merged into a single page, and mapped into both original locations. The page is also marked as "copy-on-write" (COW), so the kernel will automatically separate them again should one process modify its data.KSM was originally intended to run more virtual machines on one host by sharing memory between processes as well as virtual machines. Upon implementation, it was found to be useful for non-virtualized environments as well where memory is at a premium. An experimental implementation of KSM by Red Hat found that 52 virtual instances of Windows XP with 1 GB of memory, could run on a host computer that had only 16 GB of RAM.KSM was merged into the Linux kernel mainline in kernel version 2.6.32, which was released on December 3, 2009. To be effective, the operating system kernel must find identical memory pages held by different processes. As well it needs to decide whether the pages are going to update infrequently enough that the merging would be an efficient use of processor resources. A concern is that although memory usage is reduced, CPU usage is increased, thus negating potential increases in performance. Another concern is that KSM may pose security risks, such as allowing circumvention of address space layout randomization (ASLR).".
- Kernel_same-page_merging wikiPageExternalLink the-kernel-samepage-merging-process.
- Kernel_same-page_merging wikiPageExternalLink navpanes=0&toolbar=0.
- Kernel_same-page_merging wikiPageExternalLink KSM.
- Kernel_same-page_merging wikiPageExternalLink KSM.
- Kernel_same-page_merging wikiPageExternalLink using-ksm-kernel-samepage-merging-kvm.
- Kernel_same-page_merging wikiPageExternalLink ksm.txt.
- Kernel_same-page_merging wikiPageID "28462006".
- Kernel_same-page_merging wikiPageLength "4362".
- Kernel_same-page_merging wikiPageOutDegree "11".
- Kernel_same-page_merging wikiPageRevisionID "679439809".
- Kernel_same-page_merging wikiPageWikiLink Address_space_layout_randomization.
- Kernel_same-page_merging wikiPageWikiLink Category:Computer_memory.
- Kernel_same-page_merging wikiPageWikiLink Category:Linux_kernel_features.
- Kernel_same-page_merging wikiPageWikiLink Copy-on-write.
- Kernel_same-page_merging wikiPageWikiLink Implementation.
- Kernel_same-page_merging wikiPageWikiLink Kernel-based_Virtual_Machine.
- Kernel_same-page_merging wikiPageWikiLink Linux_kernel.
- Kernel_same-page_merging wikiPageWikiLink Linux_kernel_mainline.
- Kernel_same-page_merging wikiPageWikiLink Memory_page.
- Kernel_same-page_merging wikiPageWikiLink Page_(computer_memory).
- Kernel_same-page_merging wikiPageWikiLink Process_(computing).
- Kernel_same-page_merging wikiPageWikiLink Shared_memory_(interprocess_communication).
- Kernel_same-page_merging wikiPageWikiLink Virtual_machine.
- Kernel_same-page_merging wikiPageWikiLinkText "Kernel same-page merging".
- Kernel_same-page_merging wikiPageWikiLinkText "kernel same-page merging".
- Kernel_same-page_merging hasPhotoCollection Kernel_same-page_merging.
- Kernel_same-page_merging wikiPageUsesTemplate Template:Linux.
- Kernel_same-page_merging wikiPageUsesTemplate Template:Linux_kernel.
- Kernel_same-page_merging wikiPageUsesTemplate Template:Reflist.
- Kernel_same-page_merging wikiPageUsesTemplate Template:Use_mdy_dates.
- Kernel_same-page_merging subject Category:Computer_memory.
- Kernel_same-page_merging subject Category:Linux_kernel_features.
- Kernel_same-page_merging comment "Kernel same-page merging (abbreviated to KSM, and also known as kernel shared memory or memory merging) lets the hypervisor system share identical memory pages amongst different processes or virtualized guests. While not directly linked, KVM can use KSM to merge memory pages occupied by virtual machines.This is done by scanning through the memory finding duplicate pages. The duplicate pair is then merged into a single page, and mapped into both original locations.".
- Kernel_same-page_merging label "Kernel same-page merging".
- Kernel_same-page_merging sameAs KSM.
- Kernel_same-page_merging sameAs m.0czdmhd.
- Kernel_same-page_merging sameAs Kernel_SamePage_Merging.
- Kernel_same-page_merging sameAs Q4042168.
- Kernel_same-page_merging sameAs Q4042168.
- Kernel_same-page_merging wasDerivedFrom Kernel_same-page_merging?oldid=679439809.
- Kernel_same-page_merging isPrimaryTopicOf Kernel_same-page_merging.