https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=280909
Bug ID: 280909
Summary: Please add the vm.swap_free sysctl variable
Product: Base System
Version: CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: b...@freebsd.org
Reporter: y...@freebsd.org
top(1) shows the free swap space value using kvm_getswapinfo(3),
However, kvm_getswapinfo isn't easily available to languages other than C/C++,
like Golang.
Since sysctl already exposes the total swap size as vm.swap_total, it would be
logical to also also have vm.swap_free sysctl variable.
Every time some swap segment usage count would change, or the set of swap
segments itself would change, the corresponding in-memory variable would be
increased or decreased.
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