Every body knows Android mobile but how many knows Android is based on linux Operating System?

Linux

 

Android's kernel is based on the Linux kernel and has further architecture changes by Google outside the typical Linux kernel development cycle.Android does not have a native X Window System by default nor does it support the full set of standard GNU libraries, and this makes it difficult to port existing Linux applications or libraries to Android.
Certain features that Google contributed back to the Linux kernel, notably a power management feature called wakelocks, were rejected by mainline kernel developers, partly because kernel maintainers felt that Google did not show any intent to maintain their own code.Even though Google announced in April 2010 that they would hire two employees to work with the Linux kernel community,[41] Greg Kroah-Hartman, the current Linux kernel maintainer for the -stable branch, said in December 2010 that he was concerned that Google was no longer trying to get their code changes included in mainstream Linux.Some Google Android developers hinted that "the Android team was getting fed up with the process", because they were a small team and had more urgent work to do on Android.
However, in September 2010, Linux kernel developer Rafael J. Wysocki added a patch that improved the mainline Linux wakeup events framework. He said that Android device drivers that use wakelocks can now be easily merged into mainline Linux, but that Android's opportunistic suspend features should not be included in the mainline kernel. In August 2011, Linus Torvalds said that "eventually Android and Linux would come back to a common kernel, but it will probably not be for four to five years".
In December 2011, Greg Kroah-Hartman announced the start of the Android Mainlining Project, which aims to put some Android drivers, patches and features back into the Linux kernel, starting in Linux 3.3. further integration being expected for Linux Kernel 3.4.

Types of Android Linux

Version Release date API level Distribution (02 August 2012)
4.1.x Jelly Bean July 9, 2012 16              0.8%
4.0.x Ice Cream Sandwich October 19, 2011 14-15 15.9%
3.x.x Honeycomb February 22, 2011 11-13 2.3%
2.3.x Gingerbread December 6, 2010 9-10 60.6%
2.2 Froyo May 20, 2010 8 15.5%
2.0, 2.1 Eclair October 26, 2009 7 4.2%
1.6 Donut September 15, 2009 4 0.5%
1.5 Cupcake April 30, 2009 3 0.2%

 


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