Exposing performance data to user space/systemd

[Paul Menzel]

Dear coreboot folks,

as LinuxTag approaches and some of the systemd developers are going to
be there, I remembered the discussion how systemd only supports exposing
performance data on EFI systems [1].

Christian already brought up coreboot/SeaBIOS in that discussion. H.
Peter Anvin (Syslinux) also voiced a need for a having that for non-EFI
systems.

Christin, are there any news?

Thanks to the CBMEM console, the cbmem utility can read, and the timer
work, we have performance data available now. If I am not mistaken,
Chrome OS also supports reading these values. So maybe such an interface
could be designed during LinuxTag and implemented afterward.

If I am right about Chrome OS, do the developers have any suggestions?
Are you content with your interface and can it be generalized for
different boot loaders?

Thanks,

Paul

[1] https://plus.google.com/115547683951727699051/posts/dXs8rrFQkLd
[2] http://www.freedesktop.org/wiki/Software/systemd/BootLoaderInterface/

[Peter Stuge]

Paul Menzel wrote:
> maybe such an interface could be designed during LinuxTag and
> implemented afterward.

LinuxTag is an exhibition and not really a developer meeting.

Of course developers can meet anyway, but don't assume that
especially much meaningful work can be done.

I suggest to establish contact with all relevant parties and instead
ask if they can join the coreboot developer meeting following LinuxTag.

Keep in mind that this is already very late, because many people are
already travelling to Berlin by now.

//Peter

[Christian Gmeiner]

Hi Paul
> as LinuxTag approaches and some of the systemd developers are going to
> be there, I remembered the discussion how systemd only supports exposing
> performance data on EFI systems [1].
>
> Christian already brought up coreboot/SeaBIOS in that discussion. H.
> Peter Anvin (Syslinux) also voiced a need for a having that for non-EFI
> systems.
>
> Christin, are there any news?

The biggest problem is the defined interface between the coreboot and systemd.
> Thanks to the CBMEM console, the cbmem utility can read, and the timer
> work, we have performance data available now. If I am not mistaken,
> Chrome OS also supports reading these values. So maybe such an interface
> could be designed during LinuxTag and implemented afterward.

In the next weeks I will find some time for some coreboot work and maybe I will
get something up and running.

greets
--
Christian Gmeiner, MSc