I originally posted this at http://bdgregg.blogspot.com/2013/07/systems-performance-enterprise-and-cloud.html.
I wrote another book, Systems Performance: Enterprise and the Cloud. It will be out this year, and I'm really looking forward to it helping people improve performance of their systems. While the book has been drafted, I'm not sure how many final pages it will be, as it still needs to finish the composition and layout stages of publication.
All my spare time has been consumed with it (and before it, the previous DTrace book), which is why this blog has been quiet for many years.