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Add pressure stall information (PSI) meters on Linux
The pressure stall information (PSI) metrics provide useful information on delays caused by waiting for CPU, IO and memory. Particularly on busy servers it can provide a quick overview of what's "slowing things down".
This feature is supported on Linux >= 4.20. The interface is documented here: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/plain/Documentation/accounting/psi.txt These links provide rationale: https://lwn.net/Articles/759781/ https://facebookmicrosites.github.io/psi/
The following metrics are added, corresponding to the currently exposed
lines (see head /proc/pressure/*
):
- PressureStallCPUSome
- PressureStallIOSome
- PressureStallIOFull
- PressureStallMemorySome
- PressureStallMemoryFull
The color scheme is the same as that used for Load Average, however I gave it separate entries just in case someone wants to change them specifically.
Tested on 4.20.7-arch1-1-ARCH, on the linux platform. Also tested that other platforms still compile (changed configure to use the unsupported platform).
Closes #879.
Merged here: htop-dev/htop@2be0992