Taking forward the realtime work

Taking forward the realtime work

[Maarten Lankhorst]

Hi all,

After digging through the -rt patchset again I wanted to take it forward 
to the current kernel, so far I didn't to get much work done as the code 
seems to be kinda invasive, even with a lot of the things already in 
mainline. However a lot of things in the -rt patch seem to no longer be 
needed, since softirqs are merged, the BKL is gone, and there's a patch 
set out to make mm preemptible.

I've started testing from the mm-preempt patchset, and it seems to boot, 
but now that I'm actually looking at the -rt patchset diff from 
v2.6.33.7 it's not that trivial to port forward, so I'm looking for 
help. Blindly trying to apply the diff forward 6 versions will not work, 
so I'm looking at how to add the patches in such a way that each change 
is done in a logical order, in such a way preferably that at each point 
the kernel is bootable. I understand that for -rt there will be a few 
commits for which that won't be possible, but it seems to me the amount 
of work needed to get -rt working isn't as big any more as it used to be.

Note: There's no guarantee I'll be able to pull it off, but there's this 
itch I need to get rid of. ;)

Cheers,
Maarten

Re: Taking forward the realtime work

[Thomas Gleixner]

Maarten,

On Sat, 26 Feb 2011, Maarten Lankhorst wrote:

> Hi all,
> 
> After digging through the -rt patchset again I wanted to take it forward to
> the current kernel, so far I didn't to get much work done as the code seems to
> be kinda invasive, even with a lot of the things already in mainline. However
> a lot of things in the -rt patch seem to no longer be needed, since softirqs
> are merged, the BKL is gone, and there's a patch set out to make mm
> preemptible.
> 
> I've started testing from the mm-preempt patchset, and it seems to boot, but
> now that I'm actually looking at the -rt patchset diff from v2.6.33.7 it's not
> that trivial to port forward, so I'm looking for help. Blindly trying to apply
> the diff forward 6 versions will not work, so I'm looking at how to add the
> patches in such a way that each change is done in a logical order, in such a
> way preferably that at each point the kernel is bootable. I understand that
> for -rt there will be a few commits for which that won't be possible, but it
> seems to me the amount of work needed to get -rt working isn't as big any more
> as it used to be.
> 
> Note: There's no guarantee I'll be able to pull it off, but there's this itch
> I need to get rid of. ;)

Note: It would be nice to Cc those who are working on it and I can
assure you that there will be an update to -rt in the foreseeable
future.

Thanks,

	tglx