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Architecture Scheduler EN
Language: English ｜ Architecture-Scheduler
kernel/core/core_sched.{c,h}: preemptive, priority-based with
time-slice round-robin inside a priority level. Task control blocks
carry state, priority, slices, and the saved frame; the context
switch (arch/x86_64/arch_context_switch.S) is ABI-probe-verified
(SysV 16-byte stack alignment at the dispatch call - BUG-0137).
The PIT fires IRQ0 at 100 Hz: tick counter, g_boot_time_ms, the
soft-timer wheel, and the scheduler's preemption all hang off it.
sched, ps, nice, sleep, kill, spawn, multi are the
user-facing commands.
Long-running work (g6_test &, spinners) runs as background tasks.
The watchdog subsystem (kernel/core/core_watchdog.c) adds monitored
slots: a task that must feed its slot and stops doing so is killed -
with the reason logged - while the kernel itself stays alive. The
hardware watchdogs (TCO/WDAT) protect the whole machine instead: see
Internals-Watchdog-EN.
Ring-3 processes get signals through the syscall interface; the user
test programs (run signal_test, run fork_test, run exec_test,
run pipe_test, run select_test) demonstrate the full Unix-shaped
process model: fork, exec, pipes, select, mmap.