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<title>Kernel same-page merging</title>

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<span id="openzim-page-title" class="mw-page-title-main"><span class="mw-page-title-main">Kernel same-page merging</span></span>

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</style><div role="note" class="hatnote navigation-not-searchable">Not to be confused with <a href="Direct_Rendering_Manager#Kernel_Mode_Setting" title="Direct Rendering Manager">Kernel Mode Setting</a>, abbreviated KMS.</div>

<p>In <a href="Computing" title="Computing">computing</a>, <b>kernel same-page merging</b> (<b>KSM</b>), also known as <b>kernel shared memory</b>, <b>memory merging</b>, <b>memory deduplication</b>, and <b>page deduplication</b> is a <a href="Kernel_(operating_system)" title="Kernel (operating system)">kernel</a> feature that makes it possible for a <a href="Hypervisor" title="Hypervisor">hypervisor</a> system to share <a href="Page_(computer_memory)" title="Page (computer memory)">memory pages</a> that have identical contents between multiple <a href="Process_(computing)" title="Process (computing)">processes</a> or <a href="Virtualization" title="Virtualization">virtualized</a> guests. While not directly linked, <a href="Kernel-based_Virtual_Machine" title="Kernel-based Virtual Machine">Kernel-based Virtual Machine</a> (KVM) can use KSM to merge memory pages occupied by <a href="Virtual_machine" title="Virtual machine">virtual machines</a>.

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<div class="mw-heading mw-heading2"><h2 id="Deduplication">Deduplication</h2></div>

<p>KSM performs memory deduplication by scanning through <a href="Main_memory" class="mw-redirect" title="Main memory">main memory</a> for physical pages that have identical content, and identifies the virtual pages that are mapped to those physical pages. It leaves one page unchanged, and re-maps each duplicate page to point to the same physical page, after which it releases the extra physical pages for re-use. It also marks both virtual pages as "<a href="Copy-on-write" title="Copy-on-write">copy-on-write</a>" (COW), so that kernel will automatically remap a virtual page back to having its own separate physical page as soon as any process begins to write to it.<sup id="cite_ref-lwn.net_1-0" class="reference"><a href="#cite_note-lwn.net-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>

</p><p>KSM was originally intended to run more virtual machines on one host by <a href="Shared_memory" title="Shared memory">sharing memory</a> between processes as well as virtual machines. 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.<sup id="cite_ref-kernelnewbies_2-0" class="reference"><a href="#cite_note-kernelnewbies-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> Upon its <a href="Implementation" title="Implementation">implementation</a>, users found KSM to also be useful for non-virtualized environments in which memory is at a premium.<sup id="cite_ref-IBM2_3-0" class="reference"><a href="#cite_note-IBM2-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-kernel.org_4-0" class="reference"><a href="#cite_note-kernel.org-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup>

</p><p>KSM was merged into the <a href="Linux_kernel" title="Linux kernel">Linux kernel</a> mainline in version 2.6.32, which was released on December 3, 2009.<sup id="cite_ref-IBM2_3-1" class="reference"><a href="#cite_note-IBM2-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-kernelnewbies_2-1" class="reference"><a href="#cite_note-kernelnewbies-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> To be effective, the operating system kernel must find identical memory pages held by different processes. The kernel also needs to predict whether the pages are likely to update infrequently enough that the merging would be an efficient use of processor resources.<sup id="cite_ref-kernel.org_4-1" class="reference"><a href="#cite_note-kernel.org-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> A concern is that although memory usage is reduced, CPU usage is increased, thus negating potential increases in performance.<sup id="cite_ref-lwn.net_1-1" class="reference"><a href="#cite_note-lwn.net-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>

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<div class="mw-heading mw-heading2"><h2 id="Security_risks">Security risks</h2></div>

<p>Security is also a concern:

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<ul><li>Allows circumvention of <a href="Address_space_layout_randomization" title="Address space layout randomization">address space layout randomization</a> (ASLR)<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup></li>

<li>Exposes information via <a href="Timing_attack" title="Timing attack">timing attacks</a><sup id="cite_ref-7" class="reference"><a href="#cite_note-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-8" class="reference"><a href="#cite_note-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup></li>

<li>Allows contamination of cryptographic resources in other virtualized guests via the memory <a href="Row_hammer" title="Row hammer">row hammer</a> attack<sup id="cite_ref-9" class="reference"><a href="#cite_note-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup></li></ul>

<ul><li><a href="Data_deduplication" title="Data deduplication">Data deduplication</a> – Reduction of storage requirement by sharing duplicate files</li>

<li><a href="Single-instance_storage" title="Single-instance storage">Single-instance storage</a></li></ul>

<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>

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</style><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://lwn.net/Articles/330589/">"KSM tries again"</a>. <i>lwn.net</i>. kernel.org<span class="reference-accessdate">. Retrieved <span class="nowrap">August 21,</span> 2010</span>.</cite></span>

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<li id="cite_note-kernelnewbies-2"><span class="mw-cite-backlink">^ <a href="#cite_ref-kernelnewbies_2-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-kernelnewbies_2-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://kernelnewbies.org/Linux_2_6_32#Kernel_Samepage_Merging_.28memory_deduplication.29">"Linux kernel 2.6.32, Section 1.3. Kernel Samepage Merging (memory deduplication)"</a>. <i>KernelNewbies.org</i>. December 3, 2009<span class="reference-accessdate">. Retrieved <span class="nowrap">August 12,</span> 2015</span>.</cite></span>

</li>

<li id="cite_note-IBM2-3"><span class="mw-cite-backlink">^ <a href="#cite_ref-IBM2_3-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-IBM2_3-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><cite class="citation web cs1 cs1-prop-unfit"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20160709062356/http://www.ibm.com/developerworks/linux/library/l-kernel-shared-memory/">"Anatomy of Linux Kernel Shared Memory"</a>. <i>IBM Developer</i>. IBM. Archived from the original on July 9, 2016<span class="reference-accessdate">. Retrieved <span class="nowrap">August 21,</span> 2010</span>.</cite></span>

</li>

<li id="cite_note-kernel.org-4"><span class="mw-cite-backlink">^ <a href="#cite_ref-kernel.org_4-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-kernel.org_4-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.kernel.org/doc/ols/2009/ols2009-pages-19-28.pdf">"Increasing memory density by using KSM"</a> <span class="cs1-format">(PDF)</span>. <i>Kernel.org</i><span class="reference-accessdate">. Retrieved <span class="nowrap">August 21,</span> 2010</span>.</cite></span>

</li>

<li id="cite_note-5"><span class="mw-cite-backlink"><b><a href="#cite_ref-5">^</a></b></span> <span class="reference-text"><cite id="CITEREFKuniyasu_SuzakiKengo_IijimaToshiki_YagiCyrille_Artho" class="citation web cs1">Kuniyasu Suzaki; Kengo Iijima; Toshiki Yagi; Cyrille Artho. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20130105174201/http://staff.aist.go.jp/k.suzaki/EuroSec2011-suzaki.pdf">"Memory Deduplication as a Threat to the Guest OS"</a> <span class="cs1-format">(PDF)</span>. Archived from <a rel="nofollow" class="external text" href="http://staff.aist.go.jp/k.suzaki/EuroSec2011-suzaki.pdf">the original</a> <span class="cs1-format">(PDF)</span> on January 5, 2013<span class="reference-accessdate">. Retrieved <span class="nowrap">September 16,</span> 2013</span>.</cite></span>

</li>

<li id="cite_note-6"><span class="mw-cite-backlink"><b><a href="#cite_ref-6">^</a></b></span> <span class="reference-text"><cite id="CITEREFBarresiRazaviPayerGross2015" class="citation web cs1">Barresi, Antonio; Razavi, Kaveh; <a href="Mathias_Payer" title="Mathias Payer">Payer, Mathias</a>; Gross, Thomas R. (August 2015). <a rel="nofollow" class="external text" href="https://www.usenix.org/system/files/conference/woot15/woot15-paper-barresi.pdf">"CAIN: Silently Breaking ASLR in the Cloud"</a> <span class="cs1-format">(PDF)</span>. <a href="USENIX" title="USENIX">USENIX</a><span class="reference-accessdate">. Retrieved <span class="nowrap">August 12,</span> 2015</span>.</cite></span>

</li>

<li id="cite_note-7"><span class="mw-cite-backlink"><b><a href="#cite_ref-7">^</a></b></span> <span class="reference-text"><cite id="CITEREFRed_HatPolyakov" class="citation web cs1">Red Hat; Polyakov, Andy. <a rel="nofollow" class="external text" href="https://access.redhat.com/blogs/766093/posts/1976303">"It's all a question of time - AES timing attacks on OpenSSL"</a>. <i>access.redhat.com</i>. Red Hat<span class="reference-accessdate">. Retrieved <span class="nowrap">August 4,</span> 2016</span>.</cite></span>

</li>

<li id="cite_note-8"><span class="mw-cite-backlink"><b><a href="#cite_ref-8">^</a></b></span> <span class="reference-text"><cite id="CITEREFSchwarzlKraftLippGruss2021" class="citation web cs1">Schwarzl, Martin; Kraft, Erik; Lipp, Moritz; Gruss, Daniel (2021). <a rel="nofollow" class="external text" href="https://graz.pure.elsevier.com/en/publications/remote-memory-deduplication-attacks">"Remote Memory-Deduplication Attacks"</a>. Network and Distributed System Security Symposium<span class="reference-accessdate">. Retrieved <span class="nowrap">April 2,</span> 2022</span>.</cite></span>

</li>

<li id="cite_note-9"><span class="mw-cite-backlink"><b><a href="#cite_ref-9">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://news.softpedia.com/news/new-ffs-rowhammer-attack-targets-linux-vm-setups-507290.shtml">"New FFS Rowhammer Attack Hijacks Linux VMs"</a>. August 14, 2016<span class="reference-accessdate">. Retrieved <span class="nowrap">August 17,</span> 2016</span>.</cite></span>

</li>

</ol></div></div>

<div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2></div>

<ul><li><a rel="nofollow" class="external text" href="https://www.kernel.org/doc/Documentation/vm/ksm.txt">Linux kernel documentation</a></li>

<li><a rel="nofollow" class="external text" href="https://fedoraproject.org/wiki/Features/KSM">Fedora KSM page</a></li>

<li><a rel="nofollow" class="external text" href="http://www.linux-kvm.org/page/KSM">Kernel-based virtual machine site - KSM</a></li></ul>

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</style><div id="Linux_kernel514" style="font-size:114%;margin:0 4em"><a href="Linux_kernel" title="Linux kernel">Linux kernel</a></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%">Organization</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th id="Kernel19" scope="row" class="navbox-group" style="width:1%">Kernel</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Linux_Foundation" title="Linux Foundation">Linux Foundation</a></li>

<li><a href="Linux_Mark_Institute" title="Linux Mark Institute">Linux Mark Institute</a></li>

<li><a href="Linus's_law" title="Linus's law">Linus's law</a></li>

<li><a href="Tanenbaum%E2%80%93Torvalds_debate" title="Tanenbaum–Torvalds debate">Tanenbaum–Torvalds debate</a></li>

<li><a href="SCO%E2%80%93Linux_disputes" title="SCO–Linux disputes">SCO disputes</a></li>

<li><a href="Linaro" title="Linaro">Linaro</a></li>

<li><a href="Menuconfig" title="Menuconfig">menuconfig</a></li>

<li><a href="List_of_Linux-supported_computer_architectures" title="List of Linux-supported computer architectures">Supported computer architectures</a></li>

<li><a href="Linux_kernel_version_history" title="Linux kernel version history">Version history</a></li>

<li><a href="Criticism_of_Linux" title="Criticism of Linux">Criticism</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Support</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li>Developers

<ul><li><i><a href="The_Linux_Programming_Interface" title="The Linux Programming Interface">The Linux Programming Interface</a></i></li>

<li><a href="Kernel.org" title="Kernel.org">kernel.org</a></li>

<li><a href="Linux_conference" class="mw-redirect" title="Linux conference">Linux conferences</a></li></ul></li>

<li>Users

<ul><li><a href="Linux_user_group" title="Linux user group">Linux User Group (LUG)</a></li></ul></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">People</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Werner_Almesberger" title="Werner Almesberger">Werner Almesberger</a></li>

<li><a href="H._Peter_Anvin" title="H. Peter Anvin">H. Peter Anvin</a></li>

<li><a href="Jens_Axboe" title="Jens Axboe">Jens Axboe</a></li>

<li><a href="Moshe_Bar_(investor)" title="Moshe Bar (investor)">Moshe Bar</a></li>

<li><a href="Suparna_Bhattacharya" title="Suparna Bhattacharya">Suparna Bhattacharya</a></li>

<li><a href="Andries_Brouwer" title="Andries Brouwer">Andries Brouwer</a></li>

<li><a href="Matthew_Garrett" title="Matthew Garrett">Matthew Garrett</a></li>

<li><a href="Avi_Kivity" title="Avi Kivity">Avi Kivity</a></li>

<li><a href="Con_Kolivas" title="Con Kolivas">Con Kolivas</a></li>

<li><a href="Greg_Kroah-Hartman" title="Greg Kroah-Hartman">Greg Kroah-Hartman</a></li>

<li><a href="Benson_Leung" title="Benson Leung">Benson Leung</a></li>

<li><a href="Robert_Love" title="Robert Love">Robert Love</a></li>

<li><a href="David_S._Miller" title="David S. Miller">David S. Miller</a></li>

<li><a href="Ingo_Moln%C3%A1r" title="Ingo Molnár">Ingo Molnár</a></li>

<li><a href="Andrew_Morton_(computer_programmer)" title="Andrew Morton (computer programmer)">Andrew Morton</a></li>

<li><a href="Hans_Reiser" title="Hans Reiser">Hans Reiser</a></li>

<li><a href="Rusty_Russell" title="Rusty Russell">Rusty Russell</a></li>

<li><a href="Shuah_Khan" title="Shuah Khan">Shuah Khan</a></li>

<li><a href="Linus_Torvalds" title="Linus Torvalds">Linus Torvalds</a></li>

<li><a href="Theodore_Ts'o" title="Theodore Ts'o">Theodore Ts'o</a></li>

<li><a href="Stephen_Tweedie" title="Stephen Tweedie">Stephen Tweedie</a></li>

<li><a href="Harald_Welte" title="Harald Welte">Harald Welte</a></li>

<li><a href="Chris_Wright_(programmer)" title="Chris Wright (programmer)">Chris Wright</a></li></ul>

</div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Technical</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%">Debugging</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<li><a href="Ftrace" title="Ftrace">ftrace</a></li>

<li><a href="Kdump_(Linux)" title="Kdump (Linux)">kdump</a></li>

<li><a href="Linux_kernel_oops" title="Linux kernel oops">Linux kernel oops</a></li>

<li><a href="SystemTap" title="SystemTap">SystemTap</a></li>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Booting_process_of_Linux" title="Booting process of Linux">Startup</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Vmlinux" title="Vmlinux">vmlinux</a></li>

<li><a href="System.map" title="System.map">System.map</a></li>

<li><a href="Dracut_(software)" title="Dracut (software)">dracut</a></li>

<li><a href="Initrd" class="mw-redirect" title="Initrd">initrd</a></li>

<li><a href="Initramfs" class="mw-redirect" title="Initramfs">initramfs</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Linux_kernel_interfaces" title="Linux kernel interfaces">ABIs</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Linux_Standard_Base" title="Linux Standard Base">Linux Standard Base</a></li>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Linux_kernel_interfaces" title="Linux kernel interfaces">APIs</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%">Kernel</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Linux_kernel_interfaces#SCI" title="Linux kernel interfaces">System Call<br>Interface</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="POSIX" title="POSIX">POSIX</a>

<ul><li><a href="Ioctl" title="Ioctl">ioctl</a></li>

<li><a href="Select_(Unix)" title="Select (Unix)">select</a></li>

<li><a href="Close_(system_call)" title="Close (system call)">close</a></li>

<li><a href="Linux_kernel_interfaces#Additions_to_POSIX" title="Linux kernel interfaces">Linux-only</a>

<ul><li><a href="Futex" title="Futex">futex</a></li>

<li><a href="Epoll" title="Epoll">epoll</a></li>

<li><a href="Splice_(system_call)" title="Splice (system call)">splice</a></li>

<li><a href="Dnotify" title="Dnotify">dnotify</a></li>

<li><a href="Inotify" title="Inotify">inotify</a></li>

<li><a href="Readahead" title="Readahead">readahead</a></li>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Linux_kernel_interfaces#In–kernel_APIs" title="Linux kernel interfaces">In-kernel</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<li><a href="Crypto_API_(Linux)" title="Crypto API (Linux)">Crypto API</a></li>

<li><a href="Io_uring" title="Io uring">io uring</a></li>

<li><a href="Kernfs_(Linux)" title="Kernfs (Linux)">kernfs</a></li>

<li><a href="Memory_barrier" title="Memory barrier">Memory barrier</a></li>

<li><a href="Video4Linux" title="Video4Linux">Video4Linux</a></li>

</div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="User_space_and_kernel_space" title="User space and kernel space">Userspace</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Daemon_(computing)" title="Daemon (computing)">Daemons</a>,<br><a href="Virtual_file_system" title="Virtual file system">File systems</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li>bpffs</li>

<li><a href="Configfs" title="Configfs">configfs</a></li>

<li><a href="Devfs" class="mw-redirect" title="Devfs">devfs</a></li>

<li><a href="Devpts" title="Devpts">devpts</a></li>

<li><a href="Debugfs" title="Debugfs">debugfs</a></li>

<li>hugetlbfs</li>

<li>pipefs</li>

<li><a href="Procfs" title="Procfs">procfs</a></li>

<li>securityfs</li>

<li>sockfs</li>

<li><a href="Sysfs" title="Sysfs">sysfs</a></li>

<li><a href="Tmpfs" title="Tmpfs">tmpfs</a></li>

<li><a href="Systemd" title="Systemd">systemd</a>

<li><a href="Kmscon" title="Kmscon">Kmscon</a></li>

<li><a href="Binfmt_misc" title="Binfmt misc">binfmt_misc</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Wrapper_library" title="Wrapper library">Wrapper<br>libraries</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="C_standard_library" title="C standard library">C standard library</a>

<ul><li><a href="Glibc" title="Glibc">glibc</a></li>

<li><a href="UClibc" title="UClibc">uClibc</a></li>

<li><a href="Bionic_(software)" title="Bionic (software)">Bionic</a>

<ul><li><a href="Libhybris" title="Libhybris">libhybris</a></li></ul></li>

<li><a href="Dietlibc" title="Dietlibc">dietlibc</a></li>

<li><a href="Embedded_GLIBC" class="mw-redirect" title="Embedded GLIBC">EGLIBC</a></li>

<li><a href="Klibc" title="Klibc">klibc</a></li>

<li><a href="Newlib" title="Newlib">Newlib</a></li></ul></li>

<li><a href="Cgroups" title="Cgroups">libcgroup</a></li>

<li><a href="Direct_Rendering_Manager" title="Direct Rendering Manager">libdrm</a></li>

<li><a href="Advanced_Linux_Sound_Architecture" title="Advanced Linux Sound Architecture">libalsa</a></li>

<li><a href="Evdev" title="Evdev">libevdev</a></li>

<li><a href="Libusb" title="Libusb">libusb</a></li>

<li><a href="Io_uring" title="Io uring">liburing</a></li></ul>

</div></td></tr></tbody></table><div></div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Components</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Loadable_kernel_module" title="Loadable kernel module">Kernel modules</a></li>

<li><a href="BlueZ" class="mw-redirect" title="BlueZ">BlueZ</a></li>

<li><a href="Cgroups" title="Cgroups">cgroups</a></li>

<li><a href="Linux_console" title="Linux console">Console</a></li>

<li><a href="Bcache" title="Bcache">bcache</a></li>

<li><a href="Device_mapper" title="Device mapper">Device mapper</a></li>

<li><a href="Dm-cache" title="Dm-cache">dm-cache</a></li>

<li><a href="Dm-crypt" title="Dm-crypt">dm-crypt</a></li>

<li><a href="Evdev" title="Evdev">evdev</a></li>

<li><a href="Linux_framebuffer" title="Linux framebuffer">Framebuffer</a></li>

<li><a href="KMS_driver" class="mw-redirect" title="KMS driver">KMS driver</a></li>

<li><a href="Netfilter" title="Netfilter">Netfilter</a></li>

<li><a href="Netlink" title="Netlink">Netlink</a></li>

<li><a href="Nftables" title="Nftables">nftables</a></li>

<li><a href="Network_scheduler" title="Network scheduler">Network scheduler</a></li>

<li><a href="Zswap" title="Zswap">zswap</a></li></ul>

<ul><li><a href="Scheduling_(computing)#Linux" title="Scheduling (computing)">Process and I/O schedulers</a>:</li>

<li><a href="Brain_Fuck_Scheduler" title="Brain Fuck Scheduler">Brain Fuck Scheduler</a></li>

<li><a href="Completely_Fair_Scheduler" title="Completely Fair Scheduler">Completely Fair Scheduler</a> (CFS)</li>

<li><a href="Earliest_eligible_virtual_deadline_first_scheduling" title="Earliest eligible virtual deadline first scheduling">Earliest eligible virtual deadline first</a> (EEVDF)</li>

<li><a href="Noop_scheduler" title="Noop scheduler">Noop scheduler</a></li>

<li><a href="O(n)_scheduler" title="O(n) scheduler">O(n) scheduler</a></li>

<li><a href="O(1)_scheduler" title="O(1) scheduler">O(1) scheduler</a></li>

<li><a href="SCHED_DEADLINE" title="SCHED DEADLINE">SCHED_DEADLINE</a></li>

<li><a href="SCHED_FIFO" class="mw-redirect" title="SCHED FIFO">SCHED_FIFO</a></li>

<li><a href="SCHED_RR" class="mw-redirect" title="SCHED RR">SCHED_RR</a></li></ul>

<ul><li><a href="Linux_Security_Modules" title="Linux Security Modules">Security Modules</a>: <a href="AppArmor" title="AppArmor">AppArmor</a></li>

<li><a href="Exec_Shield" title="Exec Shield">Exec Shield</a></li>

<li><a href="Seccomp" title="Seccomp">seccomp</a></li>

<li><a href="Security-Enhanced_Linux" title="Security-Enhanced Linux">SELinux</a></li>

<li><a href="Smack_(software)" title="Smack (software)">Smack</a></li>

<li><a href="Tomoyo_Linux" title="Tomoyo Linux">Tomoyo Linux</a></li>

<li><a href="Linux_PAM" title="Linux PAM">Linux PAM</a></li></ul>

<ul><li><a href="Device_driver" title="Device driver">Device drivers</a>

<li><a href="Free_and_open-source_graphics_device_driver" title="Free and open-source graphics device driver">graphics</a></li></ul></li>

<li><a href="Raw_device" title="Raw device">Raw device</a></li></ul>

<ul><li><a href="Initramfs" class="mw-redirect" title="Initramfs">initramfs</a></li>

<li><a href="KernelCare" title="KernelCare">KernelCare</a></li>

<li><a href="Kexec" title="Kexec">kexec</a></li>

<li><a href="KGraft" title="KGraft">kGraft</a></li>

<li><a href="Kpatch" title="Kpatch">kpatch</a></li>

<li><a href="Ksplice" title="Ksplice">Ksplice</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Variants</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Mainline_Linux" class="mw-redirect" title="Mainline Linux">Mainline</a>

<ul><li><a href="Linux_kernel" title="Linux kernel">Linux kernel</a></li>

<li><a href="Linux-libre" title="Linux-libre">Linux-libre</a></li></ul></li>

<li><a href="High-performance_computing" title="High-performance computing">High-performance computing</a>

<li><a href="Compute_Node_Linux" title="Compute Node Linux">Compute Node Linux</a></li>

<li><a href="Slurm_Workload_Manager" title="Slurm Workload Manager">SLURM</a></li></ul></li>

<li><a href="Real-time_computing" title="Real-time computing">Real-time computing</a>

<ul><li><a href="RTLinux" title="RTLinux">RTLinux</a></li>

<li><a href="Xenomai" title="Xenomai">Xenomai</a></li>

<li><a href="PREEMPT_RT" title="PREEMPT RT">PREEMPT_RT</a></li></ul></li>

<li><a href="Memory_management_unit" title="Memory management unit">MMU</a>-less

<ul><li><a href="%CE%9CClinux" title="ΜClinux">μClinux</a></li>

<li><a href="PSXLinux" title="PSXLinux">PSXLinux</a></li></ul></li></ul>

</div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th id="Virtualization18" scope="row" class="navbox-group" style="width:1%"><a href="Virtualization" title="Virtualization">Virtualization</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Hypervisor" title="Hypervisor">Hypervisor</a>

<li><a href="OS-level_virtualization" title="OS-level virtualization">OS-level virtualization</a>

<ul><li><a href="Linux-VServer" title="Linux-VServer">Linux-VServer</a></li>

<li><a href="Lguest" title="Lguest">Lguest</a></li>

<li><a href="OpenVZ" title="OpenVZ">OpenVZ</a></li></ul></li>

<li>Other

<ul><li><a href="L4Linux" title="L4Linux">L4Linux</a></li>

<li><a href="User-mode_Linux" title="User-mode Linux">User-mode Linux</a></li>

<li><a href="MkLinux" title="MkLinux">MkLinux</a></li>

<li><a href="Cooperative_Linux" title="Cooperative Linux">coLinux</a></li></ul></li></ul>

</div></td></tr></tbody></table><div>

</div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Linux_adoption" title="Linux adoption">Adoption</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th id="Rangeof_use48" scope="row" class="navbox-group" style="width:1%"><a href="Linux_range_of_use" title="Linux range of use">Range<br>of use</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Linux_desktop_environments" class="mw-redirect" title="Linux desktop environments">Desktop</a></li>

<li><a href="Linux_on_embedded_systems" title="Linux on embedded systems">Embedded</a></li>

<li><a href="Video_games_and_Linux" title="Video games and Linux">Gaming</a></li>

<li>Thin client:

<li>Server:

<li><a href="Linux-powered_device" title="Linux-powered device">Devices</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Adopters</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="List_of_Linux_adopters" title="List of Linux adopters">List of Linux adopters</a></li></ul>

</div></td></tr></tbody></table><div></div></td></tr><tr><td class="navbox-abovebelow" colspan="2"><div>

<ul><li><b><span class="nowrap"><span class="noviewer" typeof="mw:File"></span> </span><a href="Portal%3ALinux" title="Portal:Linux">Linux portal</a></b></li>

<li><b><span class="nowrap"><span class="noviewer" typeof="mw:File"><span></span></span> </span><a href="Portal%3AFree_and_open-source_software" title="Portal:Free and open-source software">Free and open-source software portal</a></b></li>

<li><span class="noviewer" typeof="mw:File"><span title="Category"></span></span> <b>Category</b></li></ul>

</div></td></tr></tbody></table></div>

<div class="navbox-styles"></div><div role="navigation" class="navbox" aria-labelledby="Linux634" style="padding:3px"><table class="nowraplinks hlist mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><div id="Linux634" style="font-size:114%;margin:0 4em"><a href="Linux" title="Linux">Linux</a></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Linux_kernel" title="Linux kernel">Linux kernel</a></th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="History_of_Linux" title="History of Linux">History</a></li>

<li><a href="Linus's_law" title="Linus's law">Linus's law</a></li>

<li><a href="Linux-libre" title="Linux-libre">Linux-libre</a></li>

<li><a href="Booting_process_of_Linux" title="Booting process of Linux">Booting process</a></li>

<li><a href="Linux_kernel_oops" title="Linux kernel oops">Kernel oops</a></li>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Controversies</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Criticism_of_Linux" title="Criticism of Linux">Criticism of Linux</a></li>

<li><a href="Criticism_of_desktop_Linux" title="Criticism of desktop Linux">Criticism of desktop Linux</a></li>

<li><a href="GNU/Linux_naming_controversy" title="GNU/Linux naming controversy">GNU/Linux naming controversy</a></li>

<li><a href="Tanenbaum%E2%80%93Torvalds_debate" title="Tanenbaum–Torvalds debate">Tanenbaum–Torvalds debate</a></li>

<li><a href="SCO%E2%80%93Linux_disputes" title="SCO–Linux disputes">SCO and Linux</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Linux_distribution" title="Linux distribution">Distributions</a></th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Comparison_of_Linux_distributions" title="Comparison of Linux distributions">General comparison</a></li>

<li><a href="List_of_Linux_distributions" title="List of Linux distributions">Distributions list</a></li>

<li><a href="Comparison_of_netbook-oriented_Linux_distributions" title="Comparison of netbook-oriented Linux distributions">Netbook-specific comparison</a></li>

<li><a href="List_of_Linux_distributions_that_run_from_RAM" title="List of Linux distributions that run from RAM">Distributions that run from RAM</a></li>

<li><a href="Light-weight_Linux_distribution" class="mw-redirect" title="Light-weight Linux distribution">Lightweight</a></li>

<li><a href="Security-focused_operating_system#Linux" title="Security-focused operating system">Security-focused operating system</a></li>

<li><a href="Package_manager" title="Package manager">Package manager</a>

<ul><li><a href="Package_format" title="Package format">Package format</a></li>

<li><a href="List_of_software_package_management_systems" title="List of software package management systems">List of software package managers</a></li></ul></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Organizations</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="LinuxChix" title="LinuxChix">LinuxChix</a></li>

<li><a href="Linux_Counter" title="Linux Counter">Linux Counter</a></li>

<li><a href="Linux_Documentation_Project" title="Linux Documentation Project">Linux Documentation Project</a></li>

<li><a href="Linux_Foundation" title="Linux Foundation">Linux Foundation</a></li>

<li><a href="Linux_Mark_Institute" title="Linux Mark Institute">Linux Mark Institute</a></li>

<li><a href="Linux_user_group" title="Linux user group">Linux User Group (LUG)</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Linux_adoption" title="Linux adoption">Adoption</a></th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="List_of_Linux_adopters" title="List of Linux adopters">Adopters</a></li>

<li><a href="Linux_desktop_environments" class="mw-redirect" title="Linux desktop environments">Desktop</a></li>

<li><a href="Linux_on_embedded_systems" title="Linux on embedded systems">Embedded</a></li>

<li><a href="Linux_gaming" class="mw-redirect" title="Linux gaming">Gaming</a></li>

<li><a href="Linux_for_mobile_devices" title="Linux for mobile devices">Mobile</a></li>

<li><a href="Linux_range_of_use" title="Linux range of use">Range of use</a></li>

<li><a href="Linux_malware" title="Linux malware">Linux malware</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Media</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="DistroWatch" title="DistroWatch">DistroWatch</a></li>

<li><i><a href="Free_Software_Magazine" title="Free Software Magazine">Free Software Magazine</a></i></li>

<li><i><a href="Full_Circle_(magazine)" title="Full Circle (magazine)">Full Circle</a></i></li>

<li><a href="Linux.com" title="Linux.com">Linux.com</a></li>

<li><i><a href="Linux_Format" title="Linux Format">Linux Format</a></i></li>

<li><i><a href="Linux_Gazette" title="Linux Gazette">Linux Gazette</a></i></li>

<li><i><a href="Linux_Journal" title="Linux Journal">Linux Journal</a></i></li>

<li><i><a href="Linux_Magazine" title="Linux Magazine">Linux Magazine</a></i></li>

<li><i><a href="LinuxUser" title="LinuxUser">LinuxUser</a></i>

<ul><li><i><a href="Ubuntu_User" title="Ubuntu User">Ubuntu User</a></i></li></ul></li>

<li><a href="Linux_Outlaws" title="Linux Outlaws">Linux Outlaws</a></li>

<li><i><a href="Linux_Voice" title="Linux Voice">Linux Voice</a></i></li>

<li><a href="LugRadio" title="LugRadio">LugRadio</a></li>

<li><a href="Phoronix_Test_Suite#Phoronix_website" title="Phoronix Test Suite">Phoronix</a></li>

<li><i><a href="Revolution_OS" title="Revolution OS">Revolution OS</a></i></li>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="List_of_computer_security_certifications" title="List of computer security certifications">Security<br>certifications</a></th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="CompTIA_Linux%2B" class="mw-redirect" title="CompTIA Linux+">CompTIA Linux+</a></li>

<li><a href="Linux_Foundation_Linux_Certification" class="mw-redirect" title="Linux Foundation Linux Certification">Linux Foundation</a></li>

</div></td></tr><tr><td class="navbox-abovebelow" colspan="2"><div>

<ul><li><b><span class="nowrap"><span class="noviewer" typeof="mw:File"></span> </span><a href="Portal%3ALinux" title="Portal:Linux">Linux portal</a></b></li>

<li><span class="noviewer" typeof="mw:File"><span title="Category"></span></span> <b>Category</b></li></ul>

</div></td></tr></tbody></table></div></div><div><div class="zim-footer">

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