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| | * | | Measure timer re-arming in the proper locationAndrea Bastoni2010-05-29
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | hrtimers are properly rearmed during arm_release_timer() and no longer after rescheduling (with the norqlock mechanism of 2008.3). This commit accordingly updates the locations where measures are taken.
| | * | | Bugfix: PSN-EDF should log job_completion eventsAndrea Bastoni2010-05-29
| | | | | | | | | | | | | | | | | | | | | | | | | Log task completions in job_completion() for PSN-EDF. This fixes the problem of missing job-completion events for PSN-EDF.
| | * | | Bugfix: PSN-EDF should only requeue tasks that are not scheduledBjoern B. Brandenburg2010-05-29
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Requeue a task that is already scheduled will cause it to be effectively in the runqueue twice since scheduled tasks are conceptually the head of the queue. If a task is still scheduled, then schedule() will do the right thing and do the requeuing if necessary. This fixes crashes reported by Glenn and Andrea.
| | * | | Used miscdevice API for sched_traceBjoern B. Brandenburg2010-05-29
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch changes sched_trace.c to use the miscdevice API instead of doing all the cdev management ourselves. This remove a chunk of code and we get sysfs / udev integration for free. On systems with default udev rules, this will result in a /dev/litmus/log device being created automatically.
| | * | | Bugfix: make fdso syscalls 64bit cleanBjoern B. Brandenburg2010-05-29
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This fixes a bug found by liblitmus's regression test suite. Before: > ** LITMUS^RT test suite. > ** Running tests for LINUX. > ** Testing: don't open FMLP semaphores if FMLP is not supported... > !! TEST FAILURE open_fmlp_sem(fd, 0) -> -16, Success (expected: EBUSY) > at tests/fdso.c:21 (test_fmlp_not_active) > ** Testing: reject invalid object descriptors... ok. > ** Testing: reject invalid object types... > !! TEST FAILURE od_open(0, -1, 0) -> -22, Bad file descriptor (expected: EINVAL) > at tests/fdso.c:51 (test_invalid_obj_type) > ** Testing: reject invalid rt_task pointers... ok. > ** Result: 2 ok, 2 failed. After: > ** LITMUS^RT test suite. > ** Running tests for LINUX. > ** Testing: don't open FMLP semaphores if FMLP is not supported... ok. > ** Testing: reject invalid object descriptors... ok. > ** Testing: reject invalid object types... ok. > ** Testing: reject invalid rt_task pointers... ok. > ** Result: 4 ok, 0 failed.
| | * | | Bugfix: don't inherit od_table across forksBjoern B. Brandenburg2010-05-29
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The od_table is strictly per-thread and should not be inherited across a fork/clone. This caused memory corruption when a task exited, which ultimately could lead to oopses in unrelated code. Bug and testcase initially reported by Glenn.
| | * | | Bugfix: 1) incorrect FMLP high prio task tracking and 2) race in print statementGlenn Elliott2010-05-29
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 1) High priority task tied to FMLP semaphore in P-EDF scheduling is incorrectly tracked for tasks acquiring the lock without contention. (HP is always set to CPU 0 instead of proper CPU.) 2) Race in a print statement from P-EDF's pi_block() causes NULL pointer dereference.
| | * | | Use generic preemption function in GSN- and PSN-EDF.Bjoern B. Brandenburg2010-05-29
| | | | | | | | | | | | | | | | | | | | | | | | | This patch updates non-preemptive section support in GSN- and PSN-EDF.
| | * | | Introduce generic NP-section aware preemption functionBjoern B. Brandenburg2010-05-29
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Dealing with preemptions across CPUs in the presence of non-preemptive sections can be tricky and should not be replicated across (event-driven) plugins. This patch introduces a generic preemption function that handles non-preemptive sections (hopefully) correctly.
| | * | | Re-implement non-preemptive section support.Bjoern B. Brandenburg2010-05-29
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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.
| | * | | Add virtual LITMUS^RT control device.Bjoern B. Brandenburg2010-05-29
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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.
| | * | | Bugfix: clear LITMUS^RT state on fork completelyBjoern B. Brandenburg2010-05-29
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When a real-time task forks, then its LITMUS^RT-specific fields should be cleared, because we don't want real-time tasks to spawn new real-time tasks that bypass the plugin's admission control (if any). This was broken in three ways: 1) kernel/fork.c did not erase all of tsk->rt_param, only the first few bytes due to a wrong size argument to memset(). 2) It should have been calling litmus_fork() instead anyway. 3) litmus_fork() was _also_ not clearing all of tsk->rt_param, due to another size argument bug. Interestingly, 1) and 2) can be traced back to the 2007->2008 port, whereas 3) was added by Mitchell much later on (to dead code, no less). I'm really surprised that this never blew up before.
| | * | | Add Feather-Trace x86_64 architecture dependent codeAndrea Bastoni2010-05-29
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| | * | | [ported from 2008.3] Add Feather-Trace x86_32 architecture dependent codeAndrea Bastoni2010-05-29
| | | | | | | | | | | | | | | | | | | | | | | | | - [ported from 2008.3] Add x86_32 architecture dependent code. - Add the infrastructure for x86_32 - x86_64 integration.
| | * | | Add support for x86_64 architectureAndrea Bastoni2010-05-29
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - Add syscall on x86_64 - Refactor __NR_sleep_next_period -> __NR_complete_job for both x86_32 and x86_64
| | * | | Add pull_timers_interrupt() to x86_64Andrea Bastoni2010-05-29
| | | | | | | | | | | | | | | | | | | | Add apic interrupt vector for pull_timers() in x86_64 arch.
| | * | | [ported from 2008.3] Add PSN-EDF PluginAndrea Bastoni2010-05-29
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| | * | | [ported from 2008.3] Add PFAIR pluginAndrea Bastoni2010-05-29
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| | * | | Add optional dynamic assignment of tracing devices major nrAndrea Bastoni2010-05-29
| | | | | | | | | | | | | | | | | | | | | | | | | Setting FT_TASK_TRACE_MAJOR, LOG_MAJOR, FT_TRACE_MAJOR to 0 allows to have them automatically assigned by the kernel
| | * | | Better explanation of jump-to-CFS optimization removalBjoern B. Brandenburg2010-05-29
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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.
| | * | | Integrate litmus_tick() in task_tick_litmus()Andrea Bastoni2010-05-29
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - 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()
| | * | | Turn off GSN-EDF TRACE() spam by default.Bjoern B. Brandenburg2010-05-29
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Having GSN-EDF log so many things each tick is useful when tracking down race conditions, but it also makes it really hard to find anything else. Thus, turn it off by default but leave it in for future debugging fun.
| | * | | Refactor binomial heap names: heap -> bheapAndrea Bastoni2010-05-29
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - Binomial heap "heap" names conflicted with priority heap of cgroup in kernel - This patch change binomial heap "heap" names in "bheap"
| | * | | [ported from 2008.3] Add release-master supportAndrea Bastoni2010-05-29
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| | * | | [ported from 2008.3] Add hrtimer_start_on() APIAndrea Bastoni2010-05-29
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| | * | | [ported from 2008.3] Add send_pull_timers() support for x86_32 archAndrea Bastoni2010-05-29
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| | * | | [ported from 2008.3] Add GSN-EDF pluginAndrea Bastoni2010-05-29
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - 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.
| | * | | [ported from 2008.3] Add LITRMUS^RT syscalls to x86_32Andrea Bastoni2010-05-29
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| | * | | [ported from 2008.3] Add FMLP supportAndrea Bastoni2010-05-29
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| | * | | [ported from 2008.3] Add Stack Resource Policy (SRP) supportAndrea Bastoni2010-05-29
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| | * | | [ported from 2008.3] Add File Descriptor Attached Shared Objects (FDSO) ↵Andrea Bastoni2010-05-29
| | | | | | | | | | | | | | | | | | | | infrastructure
| | * | | [ported from 2008.3] Add common EDF functionsAndrea Bastoni2010-05-29
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| | * | | [ported from 2008.3] Add rt_domain_t supportAndrea Bastoni2010-05-29
| | | | | | | | | | | | | | | | | | | | | | | | | Still to be merged: - arm_release_timer() with no rq locking
| | * | | [ported from 2008.3] Add support for quantum alignmentAndrea Bastoni2010-05-29
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| | * | | [ported from 2008.3] Add synchronous task release APIAndrea Bastoni2010-05-29
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| | * | | [ported from 2008.3] Add complete_n() callAndrea Bastoni2010-05-29
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| | * | | Move sched_trace ring buffer to kfifo implementationAndrea Bastoni2010-05-29
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Use kfifo [kernel/kfifo.c] to implement the ring buffer used for sched_trace (TRACE() and TRACE_TASK() macros) This patch also includes some reorganization of sched_trace.c code and some fixes: - 1c39c59b3 Fix GFP_KERNEL in rb_alloc_buf with interrupt disabled. - 193ad2688 Let TRACE() log buffer size and comment converge. - 6195e2ae8 re-enable capturing of printk() messages in TRACE() logs.
| | * | | [ported from 2008.3] Add tracing support and hook up Litmus KConfig for x86Andrea Bastoni2010-05-29
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - fix requesting more than 2^11 pages (MAX_ORDER) to system allocator Still to be merged: - feather-trace generic implementation
| | * | | [ported from 2008.3] Add Feather-Trace device file supportAndrea Bastoni2010-05-29
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| | * | | [ported from 2008.3] Core LITMUS^RT infrastructureAndrea Bastoni2010-05-29
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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
* | | | | Added missing tegra files.HEADmasterJonathan Herman2013-01-22
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* | | | | Patched in Tegra support.Jonathan Herman2013-01-17
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* | | | | Merge tag 'trace-3.8-rc3-regression-fix' of ↵Linus Torvalds2013-01-14
|\ \ \ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace Pull tracing regression fixes from Steven Rostedt: "The clean up patch commit 0fb9656d957d "tracing: Make tracing_enabled be equal to tracing_on" caused two regressions. 1) The irqs off latency tracer no longer starts if tracing_on is off when the tracer is set, and then tracing_on is enabled. The tracing_on file needs the hook that tracing_enabled had to enable tracers if they request it (call the tracer's start() method). 2) That commit had a separate change that really should have been a separate patch, but it must have been added accidently with the -a option of git commit. But as the change is still related to the commit it wasn't noticed in review. That change, changed the way blocking is done by the trace_pipe file with respect to the tracing_on settings. I've been told that this change breaks current userspace, and this specific change is being reverted." * tag 'trace-3.8-rc3-regression-fix' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: tracing: Fix regression of trace_pipe tracing: Fix regression with irqsoff tracer and tracing_on file
| * | | | | tracing: Fix regression of trace_pipeLiu Bo2013-01-14
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Commit 0fb9656d "tracing: Make tracing_enabled be equal to tracing_on" changes the behaviour of trace_pipe, ie. it makes trace_pipe return if we've read something and tracing is enabled, and this means that we have to 'cat trace_pipe' again and again while running tests. IMO the right way is if tracing is enabled, we always block and wait for ring buffer, or we may lose what we want since ring buffer's size is limited. Link: http://lkml.kernel.org/r/1358132051-5410-1-git-send-email-bo.li.liu@oracle.com Signed-off-by: Liu Bo <bo.li.liu@oracle.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
| * | | | | tracing: Fix regression with irqsoff tracer and tracing_on fileSteven Rostedt2013-01-11
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Commit 02404baf1b47 "tracing: Remove deprecated tracing_enabled file" removed the tracing_enabled file as it never worked properly and the tracing_on file should be used instead. But the tracing_on file didn't call into the tracers start/stop routines like the tracing_enabled file did. This caused trace-cmd to break when it enabled the irqsoff tracer. If you just did "echo irqsoff > current_tracer" then it would work properly. But the tool trace-cmd disables tracing first by writing "0" into the tracing_on file. Then it writes "irqsoff" into current_tracer and then writes "1" into tracing_on. Unfortunately, the above commit changed the irqsoff tracer to check the tracing_on status instead of the tracing_enabled status. If it's disabled then it does not start the tracer internals. The problem is that writing "1" into tracing_on does not call the tracers "start" routine like writing "1" into tracing_enabled did. This makes the irqsoff tracer not start when using the trace-cmd tool, and is a regression for userspace. Simple fix is to have the tracing_on file call the tracers start() method when being enabled (and the stop() method when disabled). Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
* | | | | | Merge tag 'regmap-debugfs-fixes' of ↵Linus Torvalds2013-01-14
|\ \ \ \ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap Pull regmap debugfs optimisation fixes from Mark Brown: "The debugfs optimisations merged in v3.8 weren't my finest hour, there were a number of cases that the more complex algorithm made worse especially around the error handling. This patch series should address those issues." * tag 'regmap-debugfs-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap: regmap: debugfs: Make sure we store the last entry in the offset cache regmap: debugfs: Ensure a correct return value for empty caches regmap: debugfs: Discard the cache if we fail to allocate an entry regmap: debugfs: Fix check for block start in cached seeks regmap: debugfs: Fix attempts to read nonexistant register blocks
| * | | | | | regmap: debugfs: Make sure we store the last entry in the offset cacheMark Brown2013-01-08
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
| * | | | | | regmap: debugfs: Ensure a correct return value for empty cachesMark Brown2013-01-08
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This should never happen in the real world. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
| * | | | | | regmap: debugfs: Discard the cache if we fail to allocate an entryMark Brown2013-01-08
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Rather than trying to soldier on with a partially allocated cache just throw the cache away and pretend we don't have one in case we can get a full cache next time around. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
| * | | | | | regmap: debugfs: Fix check for block start in cached seeksMark Brown2013-01-08
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Check for the block we were asked to start from, not the position we're in. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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