Case study
CPQ IO Scheduler: reconstructing Xiaomi's block scheduler
CPQ IO Scheduler reconstructs Xiaomi's proprietary cpq.ko Linux block scheduler from a stripped ARM64 kernel module. Its out-of-tree C implementation combines priority classes, thread-group queues, deadline handling, and blk-mq elevator integration, with a whitepaper and author-reported benchmarks.
- Targets
- Binary
- Category
- Independent reconstruction cases
- Relationship
- Independent reconstruction project
- Sources reviewed
Requirements & limits
- Prerequisites: Building requires Linux kernel headers for the block layer and scheduler APIs; the author reports testing on Linux 6.1 with RK3588 and eMMC 5.1.
- Testing evidence: The author reports a 5-of-6 workload win against mq-deadline, with about 1.9% average IOPS uplift.
- License: GPL-2.0 license, as stated in the README and source-file notice.
About this entry
The description was reviewed against primary sources.
Primary sources
- README.md GitHub · Rasenkai/CPQ_IOSched · Revision ed59893
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