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* Make sure priority-boosting is in effectBjoern B. Brandenburg2011-07-21
| | | | | | ... before virtual spinning starts. This avoids a virtually spinning job from being preempted by a newly released job just before a global request is issued.
* Add support for MPCP-VS to the P-FP plugin.Bjoern B. Brandenburg2011-07-21
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* Add MPCP implementation to P-FP pluginBjoern B. Brandenburg2011-07-21
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* Add priority-ordered wait_queue_t implementationBjoern B. Brandenburg2011-07-21
| | | | Will be used by MPCP implementation.
* Adapt FMLP+ priority boosting order in P-FP plugin.Bjoern B. Brandenburg2011-07-21
| | | | Generic priority-points also clear the way for xPCP variants.
* Add constants for mutex locking protocolsBjoern B. Brandenburg2011-07-21
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* Port P-FP FMLP implementation to new APIBjoern B. Brandenburg2011-07-18
| | | | Let unlocking task perform the queue management.
* Improve FMLP queue management.Glenn Elliott2011-07-18
| | | | | | | | | | The next owner of a FMLP-protected resource is dequeued from the FMLP FIFO queue by unlock() (when the resource is freed by the previous owner) instead of performing the dequeue by the next owner immediately after it has been woken up. This simplifies the code a little bit and also reduces potential spinlock contention.
* bugfix: release master CPU must signal task was pickedBjoern B. Brandenburg2011-02-12
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* P-FP: preempt if there is higher-priority pending workBjoern B. Brandenburg2011-02-10
| | | | The preemption check must check the correct queue.
* P-FP: add release master supportBjoern B. Brandenburg2011-02-10
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* PSN-EDF: add release master supportBjoern B. Brandenburg2011-02-10
| | | | We can give up a processor under partitioning, too.
* C-EDF: add release master supportBjoern B. Brandenburg2011-02-10
| | | | As with GSN-EDF, do not insert release master into CPU heap.
* P-FP: implement bitmask-based priority queueBjoern B. Brandenburg2011-02-10
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* bugfix: add processors in order of increasing indices to clustersBjoern B. Brandenburg2011-02-08
| | | | | Pfair expects to look at processors in order of increasing index. Without this patch, Pfair could deadlock in certain situations.
* Pfair: various fixes concerning release timersBjoern B. Brandenburg2011-02-08
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* P-FP: add new partitioned fixed-priority pluginBjoern B. Brandenburg2011-02-08
| | | | | | Currently, this is basically the PSN-EDF plugin with a bit of renaming going on. The priority queue implementation and priority boosting implementation should change next.
* Litmus core: add support for fixed prioritiesBjoern B. Brandenburg2011-02-07
| | | | This will allow us to implement fixed-priority scheduling
* Feather-Trace: keep track of release latencyBjoern B. Brandenburg2011-02-05
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* Feather-Trace: trace locking-related suspensionsBjoern B. Brandenburg2011-02-05
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* Pfair: add release master support.Bjoern B. Brandenburg2011-02-05
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* Pfair: add support for true sporadic releasesBjoern B. Brandenburg2011-02-05
| | | | | | This patch also converts Pfair to implement early releasing such that no timer wheel is required anymore. This removes the need for a maximum period restriction.
* Feather-Trace: start with the largest permissible rangeBjoern B. Brandenburg2011-02-05
| | | | MAX_ORDER is 11, but this is about number of records, not number of pages.
* Pfair: remove sporadic_release flagBjoern B. Brandenburg2011-02-01
| | | | | Instead of having an extra flag, Pfair should just infer sporadic release based on deadlines like other plugins, too.
* Pfair: support clustered schedulingBjoern B. Brandenburg2011-02-01
| | | | | | | Just like C-EDF is a global scheduler that is split across several clusters, Pfair can be applied on a per-cluster basis. This patch changes the Pfair implementation to enable clustering based on the recently added generic clustering support.
* Litmus core: add generic clustering supportBjoern B. Brandenburg2011-02-01
| | | | | Inspired by the existing C-EDF code, this generic version will build clusters of CPUs based on a given cache level.
* Litmus core: extract userspace interface from C-EDFBjoern B. Brandenburg2011-02-01
| | | | | Make the cluster size configuration in C-EDF generic so that it can be used by other clustered schedulers.
* Feather-Trace: rename locking trace pointsBjoern B. Brandenburg2011-02-01
| | | | | Since we don't expect to trace more than one lock type at a time, having protocol-specific trace points is not required.
* fdso: pass userpsace config argument to object constructorBjoern B. Brandenburg2011-02-01
| | | | | | | | | | | | As Glenn pointed out, it is useful for some protocols (e.g., k-exclusion protocols) to know the userspace configuration at object creation time. This patch changes the fdso API to pass the parameter to the object constructor, which is then in turn passed to the lock allocater. The return code from the lock allocater is passed to userspace in return. This also fixes some null pointer dereferences in the FDSO code found by the test suite in liblitmus.
* GSN-EDF: re-implement FMLP supportBjoern B. Brandenburg2011-02-01
| | | | This introduces the global FMLP based on the generic locking layer.
* PSN-EDF: re-implement FMLP supportBjoern B. Brandenburg2011-02-01
| | | | | Implement the partitioned FMLP with priority boosting based on the generic lock API.
* EDF: support priority boostingBjoern B. Brandenburg2011-02-01
| | | | While we are at it, simplify edf_higher_prio() a bit.
* FMLP: remove old implementationBjoern B. Brandenburg2011-02-01
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* SRP: port to new generic locking APIBjoern B. Brandenburg2011-02-01
| | | | | This re-enables SRP support under PSN-EDF and demonstrates how the new locking API should be used.
* Litmus core: replace FMLP & SRP system calls with generic syscallsBjoern B. Brandenburg2011-02-01
| | | | | This renders the FMLP and SRP unfunctional until they are ported to the new locking API.
* Litmus core: add generic locking APIBjoern B. Brandenburg2011-02-01
| | | | | Provide a unified userspace interface for plugin-specific locking protocols.
* Litmus core: change plugin locking interface to generic 'allocate_lock()'Bjoern B. Brandenburg2011-02-01
| | | | | | | | | As the number of supported locking protocols is expected to rise, hard-coding things like priority inheritance in the plugin interface doesn't scale. Instead, use a new generic lock-ops approach. With this approach, each plugin can define its own protocol implementation (or use a generic one), and plugins can support multiple protocols without having to change the plugin interface for each protocol.
* fdso: supply object type to constructor and destructor methodsBjoern B. Brandenburg2011-02-01
| | | | Passing the object type explicitly will enable generic lock constructors.
* Fixed is_hrt, is_srt, and is_be macros.Jonathan Herman2011-02-01
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* Added task class to feather trace param record.Jonathan Herman2011-02-01
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* bugfix: don't let children stay Litmus real-time tasksBjoern B. Brandenburg2011-01-30
| | | | | | | | It has always been LITMUS^RT policy that children of real-time tasks may not skip the admissions test, etc. This used to be enforced, but was apparently dropped during some port. This commit re-introduces this policy. This fixes a kernel panic that occurred when "real-time children" exited without proper initilization.
* Litmus core: add copy_and_chomp() helperBjoern B. Brandenburg2011-01-30
| | | | | | We read in a line from userspace and remove the trailing newline in a number of places. This function extracts the common code to avoid future duplication.
* Added support for tracing arbitrary actions.wip-eventsJonathan Herman2011-01-26
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* Feather-Trace: dynamic memory allocation and clean exit2011.1Christopher Kenna2011-01-12
| | | | | | This patch changes Feather-Trace to allocate memory for the minor devices dynamically, which addresses a long-standing FIXME. It also provides clean module exit and error conditions for Feather-Trace.
* Feather-Trace: register devices with sysfsChristopher Kenna2011-01-12
| | | | | | | | | | This patch implements support for Feather-Trace devices to use the sysfs file system and, consequently, udev support. This allows us to allocate major/minor numbers for Feather-Trace devices dynamically, which is desirable because our old static allocations tend to create conflicts on modern distributions and/or when there are many cores.
* cleanup C-EDF cluster size configurationBjoern B. Brandenburg2011-01-05
| | | | | | | Refactor the code that determines the C-EDF cluster size. - Use an enum with symbolic constants instead of magic int values. - Complain and fail to switch if an unsupported cluster size is requested. - Default to ALL as suggested by Glenn and Andrea.
* bugfix: clear scheduled field of the correct CPU upon task_exit in C-EDFAndrea Bastoni2011-01-03
| | | | | | | | | Do not use the "scheduled_on" field to address the cpus structure within a cluster. cpus may contain less items than num_online_cpus and we may cause an out-of-bound access. Instead, use "scheduled_on" to directly access the per-cpu cpu_entry_t structure. Reported-by: Jonathan Herman <hermanjl@cs.unc.edu>
* bugfix: avoid underflow in budget_remaining()Bjoern B. Brandenburg2010-11-29
| | | | | | | budget_remaining() reports incorrect values due to the operands being switched, which leads to an integer underflow. Reported-by: Chris Kenna <cjk@cs.unc.edu>
* bugfix: fix out-of-bound array access in cedf_activate_plugin()Andrea Bastoni2010-11-29
| | | | | | | Make sure to check for maximum index value when accessing cedf_domain_t array in cedf_activate_plugin(). Reported-by: Jeremy Erickson <jerickso@cs.unc.edu>
* add optional [function@file:line] tag to TRACE() logBjoern B. Brandenburg2010-11-22
| | | | | | | | | | | Add information to each trace message that makes it easier to locate where it came from. It is disabled by default since this adds a lot of clutter. Example: 81281 P1 [gsnedf_schedule@litmus/sched_gsn_edf.c:406]: (rtspin/1483:1) blocks:0 out_of_time:0 np:0 sleep:1 preempt:0 state:0 sig:0 81282 P1 [job_completion@litmus/sched_gsn_edf.c:303]: (rtspin/1483:1) job_completion(). 81283 P1 [__add_release@litmus/rt_domain.c:344]: (rtspin/1483:2) add_release(), rel=41941764351 81284 P1 [gsnedf_schedule@litmus/sched_gsn_edf.c:453]: (rtspin/1483:2) scheduled_on = NO_CPU
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