Module capability 

Platform capabilities that vary per OS, resolved at compile time.

Front ends use this to hide panes and columns that cannot work here, rather than discovering it at runtime. See docs/PORTABILITY.md.

A constant here must be read by something. This module had ten and four of them were referenced by nothing but their own doc comments — among them PROC_IO, which claimed per-process I/O counters were available while no such column existed. A capability nothing consults is worse than no capability: it reads like an implemented feature and answers a question nobody asked. They were removed rather than kept “for later”; adding one back is two lines, and the second line is the call site.

Where the answer is needed by only one module, ask that module instead of growing this list — affinity::supported() returns whether a mask can actually be read and written, which is a stricter question than “does the panel open”.

Constants

AFFINITY

The a affinity panel has something to say on this platform.

CGROUP

cgroup membership is readable (/proc/<pid>/cgroup).

HOST_DISK_IO

Host-wide disk byte counters are available (/proc/diskstats, devstat_getdevs).