Phase 0c, plan orders #3, #4, #7.
P5-context-mod-sched: re-export SchedPolicy from context::mod (one-line
change to the use statement). The type is defined in context::context
by the previous P7-cache-affine-context commit; this just makes it
available as crate::context::SchedPolicy.
P8-percpu-sched: adds PerCpuSched struct to percpu.rs with SyncUnsafeCell-
wrapped run_queues, balance/last_queue/last_balance_time cells, and
take_lock/release_lock methods. Refactors PercpuBlock to embed
PerCpuSched as 'sched' field instead of standalone 'balance'/'last_queue'
fields. Adds get_percpu_block() helper.
P8-percpu-wiring: rewrites src/context/switch.rs to consume PerCpuSched:
- select_next_context reads from percpublock.sched.queues() instead
of the global RunContextData.set
- Initial placement chooses least-loaded CPU via PercpuSched.balance
- Load balance trigger fires periodically and migrates contexts
between per-CPU queues respecting sched_affinity
- Adds pub const fn to access per-cpu sched state safely
After this commit, the kernel builds with per-CPU run queues wired
into the scheduler. cargo check still has 1 pre-existing unrelated
error (src/acpi/fadt.rs:110 type mismatch) that predates the threading
work.
Combined with the P6-futex-sharding commit, this completes the
foundation for Phase 1 (Futex Completeness) and Phase 2 (SMP Scheduling
Quality).
vasilito
Red Bear OS