[LITMUS^RT] prop/edf-early-release

[Felipe Cerqueira]

Hi everyone,

There was a small compilation error due to the early release patch. The
name EARLY was conflicting with other stuff from the kernel.
It didn't show up when compiling for the KVM image, only on a normal
machine.

mm/slab.c:595: error: redeclaration of enumerator 'EARLY'
include/litmus/rt_param.h:52: note: previous definition of 'EARLY' was here

I attached a patch for the problem

Thanks,

Felipe


2013/3/12 Björn Brandenburg <bbb at mpi-sws.org>

>
> On Mar 6, 2013, at 7:37 PM, Glenn Elliott <gelliott at cs.unc.edu> wrote:
>
> > On Mar 6, 2013, at 11:45 AM, Jonathan Herman <hermanjl at cs.unc.edu>
> wrote:
> >
> >> Distinguishing between sporadic, periodic, and early release tasks has
> also been an issue in my plugins. I have usually been forced to assume
> periodic, but inevitably someone wants to see early release results in the
> graphs. Thumbs up.
> >>
> >> The task wake_up code in a few of the plugins assumes a sporadic model.
> This code would also have to be changed for full periodic support.
> >
> > I pushed another patch to the prop/edf-early-release branch to include
> Jonathan's requested changes for full periodic support.  Note that periodic
> jobs MUST end with sys_complete_job()---comments are included to that
> effect.  SPORADIC has also been made the default release behavior,
> maintaining Litmus's current functionality.
>
> I'm happy to merge this now on a "good now is better than perfect later"
> basis, but I still think that the SPORADIC semantics (increment job number
> using arbitrary heuristics) is broken and that we need better sporadic
> support in the future. In particular, we should have a way to distinguish
> whether a wakeup is a true job release (i.e., wakeup from waiting on a
> socket or a file descriptor corresponding to a device) or whether it is a
> self-suspension that should not trigger a job release (i.e, page fault,
> locking-related suspensions, talking to the X11 server, etc.).
>  Unfortunately, such information isn't easily available to the scheduler in
> Linux.
>
> - Björn
>
>
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> litmus-dev at lists.litmus-rt.org
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>
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