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Timer coalescing
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<h2 id="implementations-of-timer-coalescing">Implementations of timer coalescing</h2> <ul><li>The <a href="/facts/Linux_kernel/dlkduHuA">Linux kernel</a> gained support for deferrable timers in 2.6.22,<a class="footnote-ref" id="fnref:2" href="#fn:2"><sup>2</sup></a><a class="footnote-ref" id="fnref:3" href="#fn:3"><sup>3</sup></a> and controllable "timer slack" for <a href="/facts/Thread_(computing)/hh8WHyPd">threads</a> in 2.6.28 allowing timer coalescing.<a class="footnote-ref" id="fnref:4" href="#fn:4"><sup>4</sup></a><a class="footnote-ref" id="fnref:5" href="#fn:5"><sup>5</sup></a></li> <li>Timer coalescing has been a feature of <a href="/facts/Microsoft_Windows/bwhAhuSL">Microsoft Windows</a> from <a href="/facts/Windows_7/tldLdbnX">Windows 7</a> onward.<a class="footnote-ref" id="fnref:6" href="#fn:6"><sup>6</sup></a></li> <li><a href="/facts/Apple_Inc./oTJYta3k">Apple</a>'s <a href="/facts/XNU/dUCpExf0">XNU</a> kernel based <a href="/facts/OS_X/Y93vVpTm">OS X</a> gained support as of <a href="/facts/OS_X_Mavericks/5xavJXqv">OS X Mavericks</a>.<a class="footnote-ref" id="fnref:7" href="#fn:7"><sup>7</sup></a><a class="footnote-ref" id="fnref:8" href="#fn:8"><sup>8</sup></a></li> <li><a href="/facts/FreeBSD/RKsFTm7F">FreeBSD</a> supports it since September 2010.<a class="footnote-ref" id="fnref:9" href="#fn:9"><sup>9</sup></a></li></ul> <h2 id="see-also">See also</h2> <ul><li><a href="/facts/Advanced_Configuration_and_Power_Interface/GnLLzfyr">Advanced Configuration and Power Interface</a> (ACPI)</li> <li><a href="/facts/Advanced_Programmable_Interrupt_Controller/40lXS8r6">Advanced Programmable Interrupt Controller</a> (APIC)</li> <li><a href="/facts/High_Precision_Event_Timer/6kzraER5">High Precision Event Timer</a> (HPET)</li> <li><a href="/facts/HLT_(x86_instruction)/3uRtLUe4">HLT (x86 instruction)</a></li> <li><a href="/facts/Interrupt_coalescing/HzYrpthw">Interrupt coalescing</a></li> <li><a href="/facts/Programmable_interval_timer/2hpRmVAl">Programmable interval timer</a></li> <li><a href="/facts/Time_Stamp_Counter/THy8g17s">Time Stamp Counter</a> (TSC)</li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>Anderson, Nate (June 11, 2013). "How OS X "Mavericks" works its power-saving magic". Ars Technica. Retrieved 2014-03-22. <a href="https://arstechnica.com/apple/2013/06/how-os-x-mavericks-works-its-power-saving-magic/" target="_blank">https://arstechnica.com/apple/2013/06/how-os-x-mavericks-works-its-power-saving-magic/</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>"Linux Kernel 2 6 22". kernelnewbies.org. Retrieved 2014-03-22. <a href="http://kernelnewbies.org/Linux_2_6_22" target="_blank">http://kernelnewbies.org/Linux_2_6_22</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>"Add support for deferrable timers". 2007-05-08. Retrieved 2014-03-22. <a href="https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=6e453a67510a17f01b63835f18569e8c3939a38c" target="_blank">https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=6e453a67510a17f01b63835f18569e8c3939a38c</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> <li id="fn:4"><p>"time(7) - Linux manual page". Man7.org. Retrieved 2014-03-24. <a href="http://man7.org/linux/man-pages/man7/time.7.html" target="_blank">http://man7.org/linux/man-pages/man7/time.7.html</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li> <li id="fn:5"><p>"prctl(2) - Linux manual page". Man7.org. Retrieved 2014-03-24. <a href="http://man7.org/linux/man-pages/man2/prctl.2.html" target="_blank">http://man7.org/linux/man-pages/man2/prctl.2.html</a> <a href="#fnref:5" class="footnote-back-ref">↩</a></p></li> <li id="fn:6"><p>"Windows Timer Coalescing". Microsoft. January 20, 2009. Retrieved 2009-04-21. <a href="http://www.microsoft.com/whdc/system/pnppwr/powermgmt/TimerCoal.mspx" target="_blank">http://www.microsoft.com/whdc/system/pnppwr/powermgmt/TimerCoal.mspx</a> <a href="#fnref:6" class="footnote-back-ref">↩</a></p></li> <li id="fn:7"><p>"OS X Mavericks - Advanced Technologies". Apple Inc. Retrieved 2014-03-22. <a href="https://www.apple.com/osx/preview/advanced-technologies.html" target="_blank">https://www.apple.com/osx/preview/advanced-technologies.html</a> <a href="#fnref:7" class="footnote-back-ref">↩</a></p></li> <li id="fn:8"><p>"OS X Mavericks: Core Technologies Overview" (PDF). Apple, Inc. June 10, 2013. Archived from the original (PDF) on June 26, 2013. Retrieved 2013-06-10. <a href="https://web.archive.org/web/20130626042313/http://images.apple.com/osx/preview/docs/OSX_Mavericks_Core_Technology_Overview.pdf" target="_blank">https://web.archive.org/web/20130626042313/http://images.apple.com/osx/preview/docs/OSX_Mavericks_Core_Technology_Overview.pdf</a> <a href="#fnref:8" class="footnote-back-ref">↩</a></p></li> <li id="fn:9"><p>"Refactor timer management code". 13 September 2010. <a href="https://lists.freebsd.org/pipermail/svn-src-all/2010-September/028792.html" target="_blank">https://lists.freebsd.org/pipermail/svn-src-all/2010-September/028792.html</a> <a href="#fnref:9" class="footnote-back-ref">↩</a></p></li> </ol>