gc: priority scheduling with dual watermarks and cross-scan quota#436
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xiaoxichen wants to merge 1 commit into
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gc: priority scheduling with dual watermarks and cross-scan quota#436xiaoxichen wants to merge 1 commit into
xiaoxichen wants to merge 1 commit into
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xiaoxichen
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Jun 17, 2026
xiaoxichen
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- Sort eligible chunks by garbage ratio (desc) before submission so the most garbage-heavy chunks are always GC'd first
- Add gc_garbage_rate_threshold_low (default 30%) as a low watermark; chunks between the two watermarks consume at most half the quota
- Track m_pending_normal_gc_task_count in pdev_gc_actor to reflect tasks queued or running in m_gc_executor across scan cycles; previous code only capped submissions per scan, allowing unbounded queue growth
- scan_chunks_for_gc now skips a pdev entirely when already at quota, and derives low_tier_cap proportionally from remaining_capacity
- Add ADR docs/adr/gc-priority-scheduling.md
- Sort eligible chunks by garbage ratio (desc) before submission so the most garbage-heavy chunks are always GC'd first - Add gc_garbage_rate_threshold_low (default 30%) as a low watermark; chunks between the two watermarks consume at most half the quota - Track m_pending_normal_gc_task_count in pdev_gc_actor to reflect tasks queued or running in m_gc_executor across scan cycles; previous code only capped submissions per scan, allowing unbounded queue growth - scan_chunks_for_gc now skips a pdev entirely when already at quota, and derives low_tier_cap proportionally from remaining_capacity - Add ADR docs/adr/gc-priority-scheduling.md Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Signed-off-by: Xiaoxi Chen <xiaoxchen@ebay.com>
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## stable/v4.x #436 +/- ##
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Coverage ? 52.77%
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Files ? 36
Lines ? 5434
Branches ? 683
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Hits ? 2868
Misses ? 2269
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