openzfs/zfs

arc_summary to be able to show only altered tunables,spl

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#11,685 opened on Mar 3, 2021

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Type: Featuregood first issue

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Description

Describe the feature would like to see added to OpenZFS

arc_summary -s tunables/spl currently shows all values I wish I was able to quickly see only the modified values. By passing a new supplementary argument, arc_summary would omit showing tunables that are left at their default values

How will this feature improve OpenZFS?

Easier and faster identification of alterations in arc_summary tunables section output

Additional context

to help arc_summary automate obtaining default values instead of hardcoding them, modinfo -p for zfs,spl,icp and zcommon should also display default values, not just the description, in a parsable form (an identifiable pattern to extract the default value)

Contributor guide

Research direction
Investigate how arc summary currently lists all tunables, and identify a method to compare current values with defaults. Consider using modinfo p output (if enhanced to show defaults) or a hardcoded list. Implement a flag to hide unmodified values.
Tech stack
cshell
Domain
backendcli
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Mostly clear
Prerequisites
shell scriptingZFS tunables understanding
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60