https://bugs.kde.org/show_bug.cgi?id=455784
Bug ID: 455784
Summary: Support for Pressure Stall Information from /proc in
ksysguardd
Product: ksysguard
Version: unspecified
Platform: Other
OS: Linux
Status: REPORTED
Severity: minor
Priority: NOR
Component: ksysguardd
Assignee: ksysguard-b...@kde.org
Reporter: rubberduc...@icloud.com
CC: plasma-b...@kde.org
Target Milestone: ---
SUMMARY
With the new Pressure Stall Information (https://lwn.net/Articles/753840/)
added as of kernel 5.X or so, there are now /proc/pressure/[memory, cpu, io]
files available that provide information on how much "pressure" different
resources (CPU, memory, IO) are under. This is similar to how the MacOS
activity monitor app displays memory data to users by default and may be
desirable for linux users to be able to have this information available in
their ksysguard.
To paraphrase the lined article, the data provided in this proc file
essentially shows two lines. "Some", which indicates "the time in which at
least one task is stalled on the resource." and "full", which "indicates time
in which *nobody* is using the [resource] productively due to pressure". There
are some nuances for the different resources but thats the TL;DR. Each of these
datapoints is provided as rolling averages over a few time periods (10 sec, 60
sec, 300 sec) as well as a total count).
I took a look at the source code for the "memory/physical/used" sensor, which
seems fundamentally similar in that it, unlike most other sensors, also seems
to get its data from a file in /proc, rather than from lm-sensors or another
physical sensor. heres the section of the source that led me to this
conclusion:
https://invent.kde.org/plasma/ksysguard/-/blob/master/ksysguardd/Linux/Memory.c#L118
I would like to submit a patch that makes this data available as sensors in
ksysguardd (and thus allow them to appear in the ksysguard and Plasma System
Monitor apps). My current plan is to mirror the existing implementation from
the file linked above and tweak it to parse the information from the various
/proc/pressure files instead of /proc/meminfo.
Would a patch like this be something that would be useful to the ksysguardd
project? Am i misunderstanding anything about how to go about making this
change or how users of ksysguard/Plasma System Monitor could take advantage of
this?
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