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Concurrent boot sequence

Feb 27, 2009, 16:34 (2 Talkback[s])

"The results you get can fall short of your expectations if you don't also reorder the boot sequence. And if you have installed readahead, you may even have unpleasant surprises... ,p>"When you install readahead, it places an init script in /etc/init.d and its symbolic link /etc/rcS.d/S02readahead. As long as the scripts in /etc/rc?.d directories are executed in lexicographic order, this script is executed after S02mountkernfs. This is fine, because readahead actually depends on /proc being mounted, which is exactly what mountkernfs does.

"But what happens when, as a consequence of CONCURRENCY=shell, all scripts with the same priority are run in parallel? Then readahead and mountkernfs, both with priority 02, are launched together, and the latter may or may not mount /proc before the former requires it."

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