[LSF/MM/BPF TOPIC] Improving Block Layer Tracepoints for Next-Generation Backup Systems

[Vishnu ks]

Dear Community,

I would like to propose a discussion topic regarding the enhancement
of block layer tracepoints, which could fundamentally transform how
backup and recovery systems operate on Linux.

Current Scenario:

- I'm developing a continuous data protection system using eBPF to
monitor block request completions
- The system aims to achieve reliable live data replication for block devices
Current tracepoints present challenges in capturing the complete
lifecycle of write operations

Potential Impact:

- Transform Linux Backup Systems:
- Enable true continuous data protection at block level
- Eliminate backup windows by capturing changes in real-time
- Reduce recovery point objectives (RPO) to near-zero
- Allow point-in-time recovery at block granularity

Current Technical Limitations:

- Inconsistent visibility into write operation completion
- Gaps between write operations and actual data flushes
- Potential missing instrumentation points
- Challenges in ensuring data consistency across replicated volumes

Proposed Improvements:

- Additional tracepoints for better write operation visibility
- Optimal placement of existing tracepoints
- New instrumentation points for reliable block-level monitoring

Implementation Considerations:

- Performance impact of additional tracepoints
- Integration with existing block layer infrastructure
- Compatibility with various storage backends
- Requirements for consistent backup state

These improvements could revolutionize how we approach backup and
recovery on Linux systems:

- Move from periodic snapshots to continuous data protection
- Enable more granular recovery options
- Reduce system overhead during backup operations
- Improve reliability of backup systems
- Enhance disaster recovery capabilities

This discussion would benefit both the block layer and BPF
communities, as well as the broader Linux ecosystem, particularly
enterprises requiring robust backup and recovery solutions.

Looking forward to the community's thoughts and feedback.

Best regards,
-- 
Vishnu KS,
Opensource contributor and researcher,
https://xmigrate.cloud
https://iamvishnuks.com