block: Introduce a BPF-based I/O scheduler#791
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Introduce the KF_SPIN_LOCK kfunc metadata flag in BTF so kfuncs may be explicitly marked as safe to call while holding bpf_spin_lock. Allow kfuncs defined in kernel modules to be marked with KF_SPIN_LOCK. Signed-off-by: Kaitao Cheng <chengkaitao@kylinos.cn>
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added 2 commits
May 23, 2026 07:26
Introduce IOSCHED_UFQ, a blk-mq elevator ("ufq: User-programmable
Flexible Queueing") whose policy is supplied by an eBPF program via
struct_ops (insert, dispatch, merge, finish, etc.).
When no eBPF program is attached, the UFQ I/O scheduler uses a simple,
per-ctx queueing policy (similar to none). After an eBPF program is
attached, the user-defined scheduling policy replaces UFQ’s built-in
queueing policy, while per-ctx queues remain available as a fallback
mechanism.
Signed-off-by: Kaitao Cheng <chengkaitao@kylinos.cn>
Add ufq_iosched as a simple example for the UFQ block I/O scheduler, In the ufq_simple example, we implement the eBPF struct_ops hooks the kernel exposes so we can exercise and validate the behavior and stability of the kernel UFQ scheduling framework. The Makefile and directory layout are modeled after sched_ext. This mirrors the sched_ext examples pattern so developers can experiment with user-defined queueing policies on top of IOSCHED_UFQ. Signed-off-by: Kaitao Cheng <chengkaitao@kylinos.cn>
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Pull request for series with
subject: block: Introduce a BPF-based I/O scheduler
version: 2
url: https://patchwork.kernel.org/project/linux-block/list/?series=1088877