| Commit message (Collapse) | Author | Age |
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* Update prototypes for switched_to(), prio_changed(), select_task_rq().
* Fix missing pid field in printk output.
* Synchronize syscall numbers for arm and x86.
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Some notes:
* Litmus^RT scheduling class is the topmost scheduling class
(above stop_sched_class).
* scheduler_ipi() function (e.g., in smp_reschedule_interrupt())
may increase IPI latencies.
* Added path into schedule() to quickly re-evaluate scheduling
decision without becoming preemptive again. This used to be
a standard path before the removal of BKL.
Conflicts:
Makefile
arch/arm/kernel/calls.S
arch/arm/kernel/smp.c
arch/x86/include/asm/unistd_32.h
arch/x86/kernel/smp.c
arch/x86/kernel/syscall_table_32.S
include/linux/hrtimer.h
kernel/printk.c
kernel/sched.c
kernel/sched_fair.c
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To date, Litmus has just hooked into the smp_send_reschedule() IPI
handler and marked tasks as having to reschedule to implement remote
preemptions. This was never particularly clean, but so far we got away
with it. However, changes in the underlying Linux, and peculartities
of the ARM code (interrupts enabled before context switch) break this
naive approach. This patch introduces new state-machine based remote
preemption support. By examining the local state before calling
set_tsk_need_resched(), we avoid confusing the underlying Linux
scheduler. Further, this patch avoids sending unncessary IPIs.
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Conflicts:
Makefile
arch/x86/include/asm/unistd_32.h
arch/x86/kernel/syscall_table_32.S
kernel/sched.c
kernel/time/tick-sched.c
Relevant API and functions changes (solved in this commit):
- (API) .enqueue_task() (enqueue_task_litmus),
dequeue_task() (dequeue_task_litmus),
[litmus/sched_litmus.c]
- (API) .select_task_rq() (select_task_rq_litmus)
[litmus/sched_litmus.c]
- (API) sysrq_dump_trace_buffer() and sysrq_handle_kill_rt_tasks()
[litmus/sched_trace.c]
- struct kfifo internal buffer name changed (buffer -> buf)
[litmus/sched_trace.c]
- add_wait_queue_exclusive_locked -> __add_wait_queue_tail_exclusive
[litmus/fmlp.c]
- syscall numbers for both x86_32 and x86_64
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Update the budget enforcement timer after each scheduling decision.
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Having tasks that are !is_running() in shared structures is
very confusing during development and debugging, and can likely
mask bugs and/or create races.
It seems like a strange choice that Linux changes a task's state
only _after_ activating it. For LITMUS^RT tasks, we change this order.
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litmus_sched_class wasn't declared static, but it's not used outside
sched.c, so change it's signature to static.
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Insert PLUGIN_TICK_END tracing point in litmus_tick(). It was lost during
the porting of 2008.3 to 2010.1.
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- get_rr_interval() changed signature
- load_balance() and move_one_tak() are no longer needed
- spinlock_t -> raw_spinlock_t
This commit does not compile.
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Re-introduce NP sections in the configuration and in litmus.h. Remove the old
np_flag from rt_param.
If CONFIG_NP_SECTION is disabled, then all non-preemptive section checks are
constant expressions which should get removed by the dead code elimination
during optimization.
Instead of re-implementing sys_exit_np(), we simply repurposed sched_yield()
for calling into the scheduler to trigger delayed preemptions.
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GSN-EDF and friends rely on being called even if there is currently
no runnable real-time task on the runqueue for (at least) two reasons:
1) To initiate migrations. LITMUS^RT pull tasks for migrations; this requires
plugins to be called even if no task is currently present.
2) To maintain invariants when jobs block.
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- remove the call to litmus_tick() from scheduler_tick() just after
having performed the class task_tick() and integrate
litmus_tick() in task_tick_litmus()
- task_tick_litmus() is the handler for the litmus class task_tick()
method. It is called in non-queued mode from scheduler_tick()
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Port 2008.3 Core LITMUS^RT infrastructure to Linux 2.6.32
litmus_sched_class implements 4 new methods:
- prio_changed:
void
- switched_to:
void
- get_rr_interval:
return infinity (i.e., 0)
- select_task_rq:
return current cpu
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