arc_summary to be able to show only altered tunables,spl · openzfs/zfs#11685

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Type: Featuregood first issue

説明

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)

コントリビューターガイド

技術スタック: cpython
領域: cliperformance
Issue 種別: feature
難度: 3
推定時間: 1-3 hours
活動状況: stale
明確さ: clear
前提条件: Python knowledgeUnderstanding of arc summaryFamiliarity with ZFS tunables
初心者向け度: 30
調査方針: The issue requests a new flag for arc summary to show only non default tunables. A maintainer suggested using modinfo p to get defaults (see issue #11686). The implementation should modify the arc summary Python script to compare current values with defaults. Key files to review: cmd/arc summary. The script currently lists all tunables; adding logic to filter by default values requires parsing modinfo output or hardcoding defaults. The linked issue #11686 proposes enhancing modinfo to include defaults. Focus on implementing the flag and integrating with modinfo.