[LINUX] [$] The trouble with iowait

[1s2k.pl]

CPU scheduling is a challenging job; since it inherently requires making guesses about what the demands on the system will be in the future, it remains reliant on heuristics, despite ongoing efforts to remove them. Some of those heuristics take special note of tasks that are (or appear to be) waiting for fast I/O operations. There is some unhappiness, though, with how this factor is used, leading to a couple of patches taking rather different approaches to improve the situation.

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