Quota Preservation

Nobody III hungryninja101 at ...9...
Sun Mar 11 04:06:16 CET 2018

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?

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?

On Fri, Feb 16, 2018 at 5:17 AM, Norman Feske <norman.feske at ...1...>

> Hi Ben,
> On 16.02.2018 11:18, Nobody III wrote:
> > Hmm. I still strongly prefer my original idea. In particular, I don't
> > want to run out of RAM quota with hundreds of MB of physical RAM unused.
> > Can you help me understand your reasoning here?
> Instead of adding heuristics (of handing out unused memory) to init, the
> policy can be implemented outside of init by the one who controls init's
> configuration.
> The idea is that init is accompanied by another "manager" component that
> generates init's configuration and consumes init's status reports. There
> is a feedback loop between init and the manager component. This puts the
> manager component in the natural position to balance the quotas of
> init's children, and control the lifetimes of the children. However your
> quota policy may look like, you may replace/customize the manager
> component but leave init unchanged.
> In Sculpt EA, the user plays the role of the "manager" component. But
> this role can be played by a program, too.
> > What is the status of how init handles quotas? Specifically, can a
> > component go above its quota if init has more RAM available?
> No. But init does reflect this situation in its state report. So a
> manager component can respond to such a condition by increasing the
> quota in init's config.
> > What happens when a component runs out of RAM quota?
> If the component takes no special precautions, it would block until its
> RAM quota gets upgraded.
> > How much RAM quota is required to start a process?
> This depends on the component, e.g., the binary size, BSS size, shared
> libraries.
> > Is there a way to know how much RAM (and CAP) quota init has left?
> In init's reports, you can see how much RAM quota each child uses.
> Cheers
> Norman
> --
> Dr.-Ing. Norman Feske
> Genode Labs
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