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Debian GNU/Linux Reference Guide
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4.5.9 /proc filesystem

The /proc filesystem is a pseudo-filesystem and contains information about the system and running processes.

People frequently panic when they notice one file in particular - /proc/kcore - which is generally huge. This is (more or less) a copy of the contents of your computer's memory. It's used to debug the kernel. It doesn't actually exist anywhere, so don't worry about its size.

See Tuning the kernel through the proc filesystem, Section 7.3 and proc(5).

Debian GNU/Linux Reference Guide
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