litmus-rt.git, branch wip-extra-debug

DBG: add additional tracing

2011-01-05T13:13:18+00:00

This is not meant to be merged into master...

DBG: enable additional debug tracing

2011-01-05T13:13:18+00:00

cleanup C-EDF cluster size configuration

2011-01-05T13:02:21+00:00

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-EDF

2011-01-03T11:45:28+00:00

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

bugfix: avoid underflow in budget_remaining()

2010-11-29T17:58:09+00:00

budget_remaining() reports incorrect values due to the operands being
switched, which leads to an integer underflow.

Reported-by: Chris Kenna

bugfix: fix out-of-bound array access in cedf_activate_plugin()

2010-11-29T17:57:44+00:00

Make sure to check for maximum index value when accessing cedf_domain_t
array in cedf_activate_plugin().

Reported-by: Jeremy Erickson

add optional [function@file:line] tag to TRACE() log

2010-11-22T20:12:40+00:00

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

log job number in TRACE_TASK() and TRACE_CUR()

2010-11-22T20:12:06+00:00

For some problems it can be helpful to know which job of a task
generated a log message. This patch changes TRACE_TASK to add :
to the existing (/) tag.

The result is a trace such as the following, in which the third job of
rtspin/1511 completes and the fourth job is added to the release
queue.

  137615 P0: (rtspin/1511:3) job_completion().
  137616 P0: (rtspin/1511:4) add_release(), rel=262013223089
  137617 P0: (rtspin/1511:4) scheduled_on = NO_CPU

The job number for non-real-time tasks is always zero.

Bugfix: synchronize with all other CPUs before switching plugin

2010-11-20T23:15:14+00:00

The CPU triggering the plugin switch should wait until all other CPUs
are in a proper state (synch_on_plugin_switch()) before performing the
actual switch.

Based on the original patch from Jeremy Erickson .

This should solve (for most practical cases) the C-EDF-related
plugin-switch problem reported on the ML.

Improve help message for TRACE() buffer

2010-11-16T16:44:54+00:00

It's not being allocated per cpu anymore. Further, provide a hint to
the user where to find the data in userspace.