| Commit message (Collapse) | Author | Age |
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THIS CODE IS UNTESTED
We now initialize one event group for each cpu on system start. We can
get the event group for a CPU via a function in event_group.c
Another change is that an event now stores what group it is in when it
add_event() is called on it. This lets us cancel it without knowing what
event group it is in.
The above is important because Level-C events (like releases) have a
NULL event group. When calling add_event(), it will get the event group
of the current CPU. If the event needs to be canceled later, we need
that saved group in the event so we know where to remove it from.
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Also started to fix typos in Jonathan's code, but there were too many
after I realized that event_group.o was not in the LITMUS Makefile.
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This is not tested and missing everything for /proc. I just am checking
it in so that it the code is backed up in a git repository.
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Add linux kernel configuration option CONFIG_LITMUS_MC.
Attempt to restore rt_param.h to its original state as much as possible.
Remove fields from rt_task and rt_job and move them into a new mc_data
struct. Added mc_data field to rt_param compiled in only if using MC
plugin.
Make a new MC plugin specific header that contains a mc_data struct,
which is a container for mc_task struct and a mc_job struct.
Update sched_mc.c to use the new data structures. Also, add some macros
that simplify the code, e.g., getting task criticality quickly.
Add system call to set MC plugin specific stuff. Check for the change in
liblitmus.
Add a few lines to exit_litmus to reclaim the MC plugin mc_data struct
in the task_struct on task exit.
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Mixed criticality implementation, not including slack stealing.
In addition, Level A is still P-EDF instead of cyclic executive.
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Inspired by the existing C-EDF code, this generic version will build
clusters of CPUs based on a given cache level.
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Provide a unified userspace interface for plugin-specific locking
protocols.
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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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Simple logic: if a task requires precise enforcement, then program a
hr-timer to fire when the task must be descheduled. When the timer
fires, simply activate the scheduler. When we switch to a different
task, either reprogram the timer or cancel it.
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The PFAIR plugin always implicitly assumed !NO_HZ (the schedule
is wrong if NO_HZ is enabled) and does not built if hrtimers are absent:
> litmus/built-in.o: In function `pfair_activate_plugin':
> sched_pfair.c:(.text+0x7f07): undefined reference to `cpu_stagger_offset'
> litmus/built-in.o: In function `init_pfair':
> sched_pfair.c:(.init.text+0x487): undefined reference to `cpu_stagger_offset'
cpu_stagger_offset() is only available if hrtimers are enabled.
This patch makes these dependencies explicit.
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C-EDF only makes sense on multicore platforms that have shared caches.
Make it possible to disable it on other platforms, in particular,
on those that do not export get_shared_cpu_map().
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Improved C-EDF plugin. C-EDF now supports different cluster sizes (based
on L2 and L3 cache sharing) and supports dynamic changes of cluster size
(this requires reloading the plugin).
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This device only supports mmap()'ing a single page.
This page is shared RW between the kernel and userspace.
It is inteded to allow near-zero-overhead communication
between the kernel and userspace. It's first use will be a
proper implementation of user-signaled
non-preemptable section support.
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- Binomial heap "heap" names conflicted with priority heap
of cgroup in kernel
- This patch change binomial heap "heap" names in "bheap"
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- insert arm_release_timer() in add_relese() path
- arm_release_timer() uses __hrtimer_start_range_ns() instead of
hrtimer_start() to avoid deadlock on rq->lock.
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infrastructure
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Still to be merged:
- arm_release_timer() with no rq locking
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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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