litmus-rt.git/include, branch demo The LITMUS^RT kernel. Feather-Trace: keep track of interrupt-related interference. 2012-01-30T19:07:08+00:00 Bjoern B. Brandenburg bbb@cs.unc.edu 2012-01-24T08:36:12+00:00 83b11ea1c6ad113519c488853cf06e626c95a64d Increment a processor-local counter whenever an interrupt is handled. This allows Feather-Trace to include a (truncated) counter and a flag to report interference from interrupts. This could be used to filter samples that were disturbed by interrupts. 
Increment a processor-local counter whenever an interrupt is handled.
This allows Feather-Trace to include a (truncated) counter and a flag
to report interference from interrupts. This could be used to filter
samples that were disturbed by interrupts.
Litmus core: simplify np-section protocol 2011-11-24T20:21:08+00:00 Bjoern B. Brandenburg bbb@cs.unc.edu 2011-07-28T05:15:58+00:00 5bd89a34d89f252619d83fef3c9325e24311389e User a 32-bit word for all non-preemptive section flags. Set the "please yield soon" flag atomically when accessing it on remotely-scheduled tasks. 
User a 32-bit word for all non-preemptive section flags.
Set the "please yield soon" flag atomically when
accessing it on remotely-scheduled tasks.
ftdev: let bufffer-specific code handle writes from userspace 2011-11-24T20:21:05+00:00 Bjoern B. Brandenburg bbb@cs.unc.edu 2011-07-24T03:38:57+00:00 12982f31a233250c7a62b17fb4bd13594cb78777 This allows us to splice in information into logs from events that were recorded in userspace. 
This allows us to splice in information into logs from events
that were recorded in userspace.
Feather-Trace: keep track of release latency 2011-11-24T20:21:04+00:00 Bjoern B. Brandenburg bbb@cs.unc.edu 2011-02-06T04:15:09+00:00 1dead199b4ae68ab98eacec4a661fd5ecb5a2704 






Feather-Trace: trace locking-related suspensions
2011-11-24T19:15:06+00:00

Bjoern B. Brandenburg
bbb@cs.unc.edu

2011-02-06T03:57:57+00:00

4490f9ecf94e28458069a02e8cfcf4f385390499












Add option to turn off preemption state tracing
2011-11-24T18:42:59+00:00

Bjoern B. Brandenburg
bbb@cs.unc.edu

2011-11-24T18:42:59+00:00

d1d6e4c300d858c47b834be145f30973bc2921bf

Preemption state tracing is only useful when debugging preemption-
and IPI-related races. Since it creates a lot of clutter in the logs,
this patch turns it off unless explicitly requested.





Preemption state tracing is only useful when debugging preemption-
and IPI-related races. Since it creates a lot of clutter in the logs,
this patch turns it off unless explicitly requested.







C-EDF: Make migration affinity work with Release Master
2011-08-27T16:04:53+00:00

Glenn Elliott
gelliott@cs.unc.edu

2011-06-22T05:30:25+00:00

b4c52e27caa701a16e120b43a0e70ca6529a58a4

Needed to update C-EDF to handle release master.  Also
updated get_nearest_available_cpu() to take NO_CPU instead
of -1 to indicate that there is no release master.  While
NO_CPU is 0xffffffff (-1 in two's complement), we still
translate this value to -1 in case NO_CPU changes.

Signed-off-by: Andrea Bastoni <bastoni@cs.unc.edu>





Needed to update C-EDF to handle release master.  Also
updated get_nearest_available_cpu() to take NO_CPU instead
of -1 to indicate that there is no release master.  While
NO_CPU is 0xffffffff (-1 in two's complement), we still
translate this value to -1 in case NO_CPU changes.

Signed-off-by: Andrea Bastoni <bastoni@cs.unc.edu>







COMMENT: Correct comment on precise budget enforcement
2011-08-27T15:59:49+00:00

Glenn Elliott
gelliott@cs.unc.edu

2011-06-21T06:00:52+00:00

f5bee93f09b907a302e908c3cc3381ffbe826e2b

Original comment said that this feature wasn't supported,
though it has been since around October 2010.





Original comment said that this feature wasn't supported,
though it has been since around October 2010.







Avoid needlessly costly migrations.  CONFIG_SCHED_CPU_AFFINITY
2011-08-27T15:58:39+00:00

Glenn Elliott
gelliott@cs.unc.edu

2011-06-21T05:29:34+00:00

592eaca1409e55407e980f71b2ec604ca3610ba5

Given a choice between several available CPUs (unlinked) on which
to schedule a task, let the scheduler select the CPU closest to
where that task was previously scheduled.  Hopefully, this will
reduce cache migration penalties.

Notes: SCHED_CPU_AFFINITY is dependent upon x86 (only x86 is
supported at this time). Also PFair/PD^2 does not make use of
this feature.

Signed-off-by: Andrea Bastoni <bastoni@cs.unc.edu>





Given a choice between several available CPUs (unlinked) on which
to schedule a task, let the scheduler select the CPU closest to
where that task was previously scheduled.  Hopefully, this will
reduce cache migration penalties.

Notes: SCHED_CPU_AFFINITY is dependent upon x86 (only x86 is
supported at this time). Also PFair/PD^2 does not make use of
this feature.

Signed-off-by: Andrea Bastoni <bastoni@cs.unc.edu>







Merge 'Linux v3.0' into Litmus
2011-08-27T14:06:11+00:00

Andrea Bastoni
bastoni@cs.unc.edu

2011-08-27T13:43:54+00:00

7b1bb388bc879ffcc6c69b567816d5c354afe42b

Some notes:
* Litmus^RT scheduling class is the topmost scheduling class
  (above stop_sched_class).
* scheduler_ipi() function (e.g., in smp_reschedule_interrupt())
  may increase IPI latencies.
* Added path into schedule() to quickly re-evaluate scheduling
  decision without becoming preemptive again. This used to be
  a standard path before the removal of BKL.

Conflicts:
	Makefile
	arch/arm/kernel/calls.S
	arch/arm/kernel/smp.c
	arch/x86/include/asm/unistd_32.h
	arch/x86/kernel/smp.c
	arch/x86/kernel/syscall_table_32.S
	include/linux/hrtimer.h
	kernel/printk.c
	kernel/sched.c
	kernel/sched_fair.c





Some notes:
* Litmus^RT scheduling class is the topmost scheduling class
  (above stop_sched_class).
* scheduler_ipi() function (e.g., in smp_reschedule_interrupt())
  may increase IPI latencies.
* Added path into schedule() to quickly re-evaluate scheduling
  decision without becoming preemptive again. This used to be
  a standard path before the removal of BKL.

Conflicts:
	Makefile
	arch/arm/kernel/calls.S
	arch/arm/kernel/smp.c
	arch/x86/include/asm/unistd_32.h
	arch/x86/kernel/smp.c
	arch/x86/kernel/syscall_table_32.S
	include/linux/hrtimer.h
	kernel/printk.c
	kernel/sched.c
	kernel/sched_fair.c