Profile-guided optimization for the kernel

One of the many unfortunate consequences of the Covid-19 pandemic was the cancellation of the 2020 GNU Tools Cauldron. That loss turned out to be a gain for the Linux Plumbers Conference, which was able to add a GNU Tools track to host many of the discussions that would have otherwise occurred at Cauldron. In that track, Ian Bearman presented his group's work using profile-guided optimization with the Linux kernel. This technique, which he often referred to as "pogo", is not straightforward to apply to the kernel, but the benefits would appear to justify the effort.

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