This release of Is Parallel Programming Hard, And, If So, What Can You Do About It? features the (very skeletal) beginnings of the data-structures chapter, twelve new cartoons, and general updates to the first seven chapters. It also includes contributions from Kornilios Kourtis, Namhyung Kim, Ricardo Fabbri and his class, and Yuchen Dai.
As always, git://git.kernel.org/pub/scm/linux/kerne

Comments
Can't say as I know which would crack first, the passphrases or the minds of the people attempting to program it!
git clone git://git.kernel.org/pub/scm/linux/kerne
cd perfbook/CodeSamples
The code will be in this directory tree. You can use a "find" command to look for the filenames listed in the book, for example.