Process tagging with ptags

For various reasons related to accounting and security, there is recurring interest in having the kernel identify the container that holds any given process. Attempts to implement that functionality tend to run into the same roadblock, though: the kernel has no concept of what a "container" is, and there is seemingly little desire to change that state of affairs. A solution to this problem may exist in the form of a neglected patch called "ptags", which enables the attachment of arbitrary tags to processes.

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