Quota Preservation

[Nobody III]

Thanks. If nobody else gets to it first, I'll probably implement dynamic
cap quota adjustment in init. As for determining starting quotas, I'm
wondering mostly for porting QProcess, so I won't be working with packages.

On Tue, Mar 13, 2018 at 3:55 AM, Norman Feske <norman.feske at ...1...>
wrote:

> Hi Ben,
>
> On 11.03.2018 04:06, Nobody III wrote:
> > Thanks. How about CAP quotas? What happens when a component runs out of
> > CAPs? And init doesn't seem to indicate the number or CAPs each child is
> > using. Shouldn't CAPs be added to the report?
>
> you can add this information to init's state report via the
> 'child_caps="yes"' attribute. Currently, unlike RAM, init does not
> support the dynamic adjustment of cap quota. This is not an inherent
> limitation but just not implemented.
>
> > Also, how can a process determine how much RAM quota is required to
> > start a process? Is there a good heuristic at least, perhaps in noux?
>
> This information should be covered by the 'runtime' file of a pkg
> archive. For an example, have a look at the pkg/noux-system as used by
> Sculpt:
>
>
> https://github.com/genodelabs/genode/blob/master/repos/
> ports/recipes/pkg/noux-system/runtime
>
> When thinking of building blocks, we should start thinking about depot
> pkgs, not ELF executables. E.g., one ELF executable may be referred to
> by several pkgs (with different configurations). The RAM and caps
> demands may very well vary depending on the configuration. By
> introducing a pkg for each flavor, we can nicely capture this. E.g., the
> pkg/nic_router-nat runtime employs the NIC router in one particular
> flavour.
>
>
> https://github.com/genodelabs/genode/blob/master/repos/os/
> recipes/pkg/nic_router-nat/runtime
>
> The same NIC router could be used as an ingredient of many other
> building blocks.
>
> Cheers
> Norman
>
> --
> Dr.-Ing. Norman Feske
> Genode Labs
>
> https://www.genode-labs.com · https://genode.org
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