Gregory Nutt
9ce4022096
SMP: Fix an error in critical section logic when performing a context switch from an interrupt handler. The g_cpu_irqset bit was not being set for the CPU so other CPUs did not know about the critical section.
2017-01-13 06:48:10 -06:00
Gregory Nutt
e7d2b9f0e8
SMP: Move sharable function to common file as irq_cpu_locked(). Use irq_cpu_locked() in sched_unlock()
2016-12-29 08:17:10 -06:00
Gregory Nutt
96394f339e
SMP: Fix a gap where we may try to make modifications to the task lists without being in a critical sections. That permits concurrent access to the tasks lists and many subtle problems. This fix just remains in the critical section throughout the operation (and possible until the task is restore in the event of a context switch). Makes a big difference in stability
2016-12-28 13:58:24 -06:00
Gregory Nutt
849a5dc2a9
SMP: Enforce this rule: Tasks which are normally restored when sched_unlock() is called must remain pending (1) if we are in a critical section, i.e., g_cpu_irqlock is locked , or (2) other CPUs still have pre-emption disabled, i.e., g_cpu_schedlock is locked. In those cases, the release of the pending tasks must be deferred until those conditions are met.
2016-12-26 08:15:02 -06:00
Gregory Nutt
d45a81d643
Revert "SMP: Fix a error introduced in 36b676eea6 and fully decouple disabling of pre-emption from critical sections."
...
This reverts commit 9aedf1bdec
2016-12-26 07:48:22 -06:00
Gregory Nutt
9aedf1bdec
SMP: Fix a error introduced in 36b676eea6 and fully decouple disabling of pre-emption from critical sections.
2016-12-25 06:54:43 -06:00
Gregory Nutt
e6fff09ef8
Implement deferred IRQ locking. So far only form ARMv7-M.
2016-12-23 07:55:41 -06:00
Gregory Nutt
9ed0387379
Olimex-LPC1766-STK: Enable procfs in NSH configuration. Automount /proc on startup.
2016-12-05 08:52:40 -06:00
Gregory Nutt
00215fbc98
sched_note: Add spinlock instrumentation; In SMP configurations, select to log only notes from certain CPUs
2016-11-28 10:33:46 -06:00
Gregory Nutt
e3fe320e08
SMP: Add support for linking spinlocks into a special, non-cached memory region.
2016-11-26 08:47:03 -06:00
Gregory Nutt
1d06e786e1
SMP: Clean-up and simplication of logic that I implemented late last night.
2016-11-26 07:05:27 -06:00
Gregory Nutt
a0e1af2614
SMP: Fix yet another potential deadlock
2016-11-25 23:04:27 -06:00
Gregory Nutt
7bec4ffeec
Update some comments
2016-11-23 17:40:01 -06:00
Gregory Nutt
f90525a5d1
SMP: Update some comments; trivial improvement by inlining static function.
2016-11-22 16:48:57 -06:00
Gregory Nutt
bac7153609
SMP: Add logic to avoid a deadlock condition when CPU1 is hung waiting for g_cpu_irqlock and CPU0 is waitin for g_cpu_paused
2016-11-22 11:34:16 -06:00
Gregory Nutt
69e9f8638d
Most interrupt handling logic interacts with tasks via standard mechanism such as sem_post, sigqueue, mq_send, etc. This all call enter_critical_section and are assumed to be safe in the SMP case.
...
But certain logic interacts with tasks in different ways. The only one that comes to mind are wdogs. There is a tasking interface that to manipulate wdogs, and a different interface in the timer interrupt handling logic to manage wdog expirations.
In the normal case, this is fine. Since the tasking level code calls enter_critical_section, interrupts are disabled an no conflicts can occur. But that may not be the case in the SMP case. Most architectures do not permit disabling interrupts on other CPUs so enter_critical_section must work differently: Locks are required to protect code.
So this change adds locking (via enter_critical section) to wdog expiration logic for the the case if the SMP configuration.
2016-11-18 13:57:30 -06:00
Gregory Nutt
78fd358023
Update some comments.
2016-11-18 08:20:52 -06:00
Gregory Nutt
8602e8a8a9
SMP: irq_csection() has a bad assumption. It assumed that the state of certain variables. That was true on entry into the interrupt handler, but might change to the execution of logic within the interrupt handler.
2016-11-18 07:38:16 -06:00
Gregory Nutt
8e029f019b
Update comments
2016-11-17 17:30:12 -06:00
Gregory Nutt
47b52a2633
Fix an error in manually bringing in Sebastien's changes; Update some comments.
2016-11-17 16:15:06 -06:00
Gregory Nutt
9acd57c819
Fix up some naming and update some comments.
2016-11-17 15:50:39 -06:00
Gregory Nutt
558f4049d4
sched/irq/irq_csection: Fix a bad DEBUG assertion when SMP is enabled.
2016-11-17 15:36:27 -06:00
Gregory Nutt
2c314464a8
Fix a typo in a comment
2016-11-17 08:03:45 -06:00
Gregory Nutt
ccdc11d8ff
Fix typo in variable naming. g_cpu_irqset should be g_cpu_irqlock.
2016-11-17 06:37:24 -06:00
Gregory Nutt
1c1564f0c1
Add logic to handled nested calls to enter_critical_section() from interrupts handlers (with SMP).
2016-11-16 22:45:08 -06:00
Gregory Nutt
0c3207e86e
Fix backward logic in an assertion.
2016-11-16 21:48:27 -06:00
Gregory Nutt
16f0b8fa96
Fix typos in DEBUASSERT statements
2016-11-16 19:58:51 -06:00
Gregory Nutt
f1e4951a8d
Fix some comments
2016-11-16 19:11:31 -06:00
Gregory Nutt
4ca653a1cc
Add some experimental changes to enter/leave_critical_section to deal with the case where interrupts are disabled only on the local CPU
2016-11-16 18:28:35 -06:00
Gregory Nutt
5ce3b399d5
Correct some typos in comments
2016-11-15 16:48:40 -06:00
Gregory Nutt
40d7216a22
Back out 65ab12 and parts of 21f92b
2016-11-15 15:44:43 -06:00
Gregory Nutt
6683f01444
Trivial change to comment
2016-11-15 13:38:43 -06:00
Gregory Nutt
21f92ba601
Review some SMP logic; update comments; refresh configuration.
2016-11-15 09:24:00 -06:00
Gregory Nutt
65ab12fbb9
If SMP is enabled, if any interrupt handler calls enter_critical_section(), it should take the spinlock.
2016-11-15 08:37:58 -06:00
Gregory Nutt
b53866c872
sched/irq: Change order for SMP case in enter_critical_section: Disble local interrupts BEFORE taking spinlock.
2016-11-15 07:54:18 -06:00
Gregory Nutt
32838fcc2c
enter/leave_critical_section: In SMP configuration, may attempt to access the task lists before they have been initialized
2016-05-18 09:17:01 -06:00
Gregory Nutt
d20db82fcb
Scheduler instrumentation: Fix some associated with monitoring critical sections
2016-03-21 17:08:07 -06:00
Gregory Nutt
7f19631338
sched/: Add option to buffer scheduler instrumentation data in memory.
2016-03-17 09:49:43 -06:00
Gregory Nutt
72d3920295
Rename cpuset_t to cpu_set_t which is the type used in some non-standard Linux/GNU interfaces. Move definitions of cpu_set_t to include/sys/types.h. Add prototypes for sched_setaffinity(), sched_getaffinity(), pthread_attr_setaffinity_np(), pthread_attr_getaffinity_np(), pthread_setaffinity_np(), and pthread_getaffinity_np(). No implementation is yet in place.
2016-02-19 15:57:07 -06:00
Gregory Nutt
b50325bb38
SMP: Add funtions to perform atomic bit set/clear operations; fix two errors in SMP macros
2016-02-17 13:20:01 -06:00
Gregory Nutt
8ac12839c3
leave_critical_section: Fix text of whether spinlock should be released or not
2016-02-17 10:55:18 -06:00
Gregory Nutt
384e51cb05
Add some additional schedule instrumentation
2016-02-16 15:21:45 -06:00
Gregory Nutt
fccef49305
Cosmetic changes to comments
2016-02-15 13:48:08 -06:00
Gregory Nutt
8399938138
SMP: I think we have to spinlock before we are possibly suspended
2016-02-15 10:15:07 -06:00
Gregory Nutt
3c46fa3f9f
Fix a contention problem in the previous critical section design
2016-02-15 08:50:20 -06:00
Gregory Nutt
c7df82147f
SMP: First cut integration of enter/leave_critical_section and the scheduler. There are some issues.
2016-02-15 08:06:17 -06:00
Gregory Nutt
9cb2a6b1f9
Rename irqsave() and irqrestore() to up_irq_save() and up_irq_restore()
2016-02-14 16:19:15 -06:00
Gregory Nutt
d017e3eb2e
SMP: Forgot to add a file before the last commit
2016-02-13 10:25:36 -06:00
