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* Add ARM syscall def for get_current_budgetv2015.1Bjoern Brandenburg2015-09-07
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* Add x86 syscall defs for get_current_budgetBjoern Brandenburg2015-09-07
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* LITMUS^RT Core: add get_current_budget() system callBjoern Brandenburg2015-09-07
| | | | | Allow userspace to figure out the used-up and remaining budget of a task.
* Add PD^2 scheduler plugin2015.1Bjoern Brandenburg2015-08-09
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* Add C-EDF scheduler pluginBjoern Brandenburg2015-08-09
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* Add P-FP scheduler pluginBjoern Brandenburg2015-08-09
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* Add GSN-EDF scheduler pluginBjoern Brandenburg2015-08-09
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* Add PSN-EDF scheduler pluginBjoern Brandenburg2015-08-09
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* Hook into kernel/exit.c to force exiting RT tasks into best-effort modeBjoern Brandenburg2015-08-09
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* Protect LITMUS^RT tasks from re-nicingBjoern Brandenburg2015-08-09
| | | | | Assigning a nice value to LITMUS^RT tasks is meaningless. Bail out early.
* Don't call set_tsk_need_resched() on remote LITMUS^RT taskBjoern Brandenburg2015-08-09
| | | | This patch fixes a BUG_ON() in litmus/preempt.c.
* Hook into SCHED_DEADLINE to protect LITMUS^RT tasksBjoern Brandenburg2015-08-09
| | | | | SCHED_DEADLINE should not preempt LITMUS^RT tasks, as the LITMUS^RT scheduling class is positioned above the SCHED_DEADLINE policy.
* Hook into rt scheduling class to protect LITMUS^RT tasksBjoern Brandenburg2015-08-09
| | | | | | The rt scheduling class thinks it's the highest-priority scheduling class around, next to SCHED_DEADLINE. It is not in LITMUS^RT. Don't go preempting remote cores that run SCHED_LITMUS tasks.
* Don't trigger load balancer in scheduler tick for LITMUS^RTBjoern Brandenburg2015-08-09
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* Hook into finish_switch()Bjoern Brandenburg2015-08-09
| | | | To keep track of stack usage and to notify plugin, if necessary.
* Reset SCHED_LITMUS scheduling class on forkBjoern Brandenburg2015-08-09
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* Block sched_setaffinity() for SCHED_LITMUS tasksBjoern Brandenburg2015-08-09
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* Integrate LITMUS^RT scheduling class with sched_setschedulerBjoern Brandenburg2015-08-09
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* Disable cut-to-CFS optimization in Linux schedulerBjoern Brandenburg2015-08-09
| | | | | Global plugins require that the plugin be called even if there currently is no real-time task executing on the local core.
* Integrate LITMUS^RT with try_to_wake_up() pathBjoern Brandenburg2015-08-09
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* Make LITMUS^RT scheduling class the highest-priority scheduling classBjoern Brandenburg2015-08-09
| | | | | | Needs to be above stop_machine_class for legacy reasons; the main plugins were developed before stop_machine_class was introduced and assume that they are the highest-priority scheduling class.
* Add LITMUS^RT scheduling class in kernel/sched/MakefileBjoern Brandenburg2015-08-09
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* Introduce LITMUS^RT runqueue dummy into struct rqBjoern Brandenburg2015-08-09
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* Integrate SRP ceiling blocking callback with Linux schedulerBjoern Brandenburg2015-08-09
| | | | Check whether a suspension is required at end of schedule().
* Hookup sched_trace_XXX() tracing in Linux schedulerBjoern Brandenburg2015-08-09
| | | | This patch adds context switch tracing to the main Linux scheduler.
* Augment rt_task() with is_realtime()Bjoern Brandenburg2015-08-09
| | | | | | | | | | | Whenever the kernel checks for rt_task() to avoid delaying real-time tasks, we want it to also not delay LITMUS^RT tasks. Hence, most calls to rt_task() should be matched by an equivalent call to is_realtime(). Notably, this affects the implementations of select() and nanosleep(), which use timer_slack_ns when setting up timers for non-real-time tasks.
* Hook into fork(), exec(), and exit()Bjoern Brandenburg2015-08-09
| | | | | Allow LITMUS^RT to do some work when a process is created or terminated.
* Call sched_state_task_picked() from pick_next_task_stop()Bjoern Brandenburg2015-08-09
| | | | | Otherwise, the scheduler state machine becomes confused (and goes into a rescheduling loop) when stop-machine is triggered.
* Integrate preemption state machine with Linux schedulerBjoern Brandenburg2015-08-09
| | | | Track when a processor is going to schedule "soon".
* Record LITMUS^RT timestamp in ftrace recordsBjoern Brandenburg2015-08-09
| | | | | Patch updates ftrace.h to record a litmus_clock() time stamp in ftrace records.
* Move trace point definition to litmus/litmus.cBjoern Brandenburg2015-08-09
| | | | | | | | If !CONFIG_SCHED_TASK_TRACE, but CONFIG_SCHED_LITMUS_TRACEPOINT, then we still need to define the tracepoint structures. This patch should be integrated with the earlier sched_task_trace.c patches during one of the next major rebasing efforts.
* Add LITMUS^RT syscalls for x86Bjoern Brandenburg2015-08-09
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* Add LITMUS^RT syscalls for ARMBjoern Brandenburg2015-08-09
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* Add LITMUS^RT core implementationBjoern Brandenburg2015-08-09
| | | | | | | | | | | | | This patch adds the core of LITMUS^RT: - library functionality (heaps, rt_domain, prioritization, etc.) - budget enforcement logic - job management - system call backends - virtual devices (control page, etc.) - scheduler plugin API (and dummy plugin) This code compiles, but is not yet integrated with the rest of Linux.
* Add object descriptor table to Linux's task_structBjoern Brandenburg2015-08-09
| | | | | This table is similar to a file descriptor table. It keeps track of which "objects" (locks) a real-time task holds a handle to.
* Add tracepoint supportBjoern Brandenburg2015-08-09
| | | | | | | This patch integrates LITMUS^RT's sched_trace_XXX() macros with Linux's notion of tracepoints. This is useful to visualize schedules in kernel shark and similar tools. Historically, LITMUS^RT's sched_trace predates Linux's tracepoint infrastructure.
* Add schedule tracing supportBjoern Brandenburg2015-08-09
| | | | | | This patch introduces the sched_trace infrastructure, which in principle allows tracing the generated schedule. However, this patch does not yet integrate the callbacks with the kernel.
* Feather-Trace: write interrupt counts to control pageBjoern Brandenburg2015-08-09
| | | | | This patch exports the interrupt counter to userspace via the control page.
* Feather-Trace: use proper definition of is_realtime()Bjoern Brandenburg2015-08-09
| | | | Remove dummy implementation of is_realtime() in trace.c.
* Introduce main LITMUS^RT headerBjoern Brandenburg2015-08-09
| | | | | This patch adds a basic litmus/litmus.h, which is required for basic LITMUS^RT infrastructure to compile.
* Extend task_struct with rt_paramBjoern Brandenburg2015-08-09
| | | | This patch adds the PCB extensions required for LITMUS^RT.
* Add hrtimer_start_on() supportBjoern Brandenburg2015-08-09
| | | | | | This patch adds hrtimer_start_on(), which allows arming timers on remote CPUs. This is needed to avoided timer interrupts on "shielded" CPUs and is also useful for implementing semi-partitioned schedulers.
* Add TRACE() debug tracing supportBjoern Brandenburg2015-08-09
| | | | | | | This patch adds the infrastructure for the TRACE() debug macro. Conflicts: kernel/printk.c
* Add object list to inodesBjoern Brandenburg2015-08-09
| | | | | | | This patch adds a list of arbitrary objects to inodes. This is used by Linux's locking API to attach lock objects to inodes (which represent namespaces in Linux's locking API).
* Add SCHED, SCHED2, TICK, and CXS overhead tracepointsBjoern Brandenburg2015-08-09
| | | | | | | This patch integrates the overhead tracepoints into the Linux scheduler that are compatible with plain vanilla Linux (i.e., not specific to LITMUS^RT plugins). This can be used to measure the overheads of an otherwise unmodified kernel.
* Integrate ft_irq_fired() with LinuxBjoern Brandenburg2015-08-09
| | | | | This patch hooks up Feather-Trace's ft_irq_fired() handler with Linux's interrupt handling infrastructure.
* Feather-Trace: add LITMUS^RT overhead tracing infrastructureBjoern Brandenburg2015-08-09
| | | | | This patch adds the main infrastructure for tracing overheads in LITMUS^RT. It does not yet introduce any tracepoints into the kernel.
* Feather-Trace: add generic ftdev device driverBjoern Brandenburg2015-08-09
| | | | | This patch adds the ftdev device driver, which is used to export samples collected with Feather-Trace to userspace.
* Feather-Trace: add x86 binary rewriting implementationBjoern Brandenburg2015-08-09
| | | | | This patch adds the x86-specific implementation of Feather-Trace triggers that works by rewriting jump instructions.
* Feather-Trace: add platform independent implementationBjoern Brandenburg2015-08-09
| | | | | This patch adds the simple fallback implementation and creates dummy hooks in the x86 and ARM Kconfig files.
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