Submission + - How Google Uses Linux (lwn.net)
postfail writes: lwn.net coverage of the 2009 Linux Kernel Summit (http://lwn.net/Articles/KernelSummit2009/) includes a recap of a presentation by Google engineers and how they use Linux. According to the article, a team of 30 Google engineers is rebasing to the mainline kernel every 17 months, presently carrying 1208 patches to 2.6.26 and inserting almost 300,000 lines of code; roughly 25% of those patches are backports of newer features.
