I don't feel like this is a particularly fair criticism of this post. First, this guy is rooting around in the kernel code for fun. Why are we criticizing this? Second, I've done a fair amount of C programming and mucking about at the OS level, and I wasn't aware of this feature. Maybe that's because most of my production deployment has been on BSD and Solaris, not Linux, but I found the post useful. Third, I didn't feel like the author was particularly tooting his own horn, just saying "Hey I found about about this cool thing; maybe you will find this useful too".