Re: [Xen-devel] [PATCH v1 12/12] libxl: add device backend listener in order to launch backends

[Shriram Rajagopalan <rshriram@xxxxxxxxx>]

On Fri, Nov 8, 2013 at 5:41 AM, Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx> wrote:

Shriram Rajagopalan writes ("Re: [Xen-devel] [PATCH v1 12/12] libxl: add device backend listener in order to launch backends"):

>     > >  /*
>     > > + * Short-lived sub-ao, aka "nested ao".
>     > > + *
>     > > + * Some asynchronous operations are very long-running.  Generally,
>     > > + * since an ao has a gc, any allocations made in that ao will live
>     > > + * until the ao is completed.  When this is not desirable, these
>     > > + * functions may be used to manage a "sub-ao".
>     > > + *
>
> Just to make sure I understand this whole thing fully:
>
> This is targeted against long running AOs that have a lot of
> intermittent "events", each of which may cause more memory
> allocations. By creating throwaway-ao's for these events, one can
> service these events asynchronously (if they are long running by
> themselves) while quickly reclaiming the memory after event
> completion.

Yes.

> And this can be used in suspend/resume/restore code to create these
> throwaway nested-aos during each iteration, so as to avoid the
> possibility of accumulating memory on the main gc.

Yes.

Ian.

Are these nested-ao patches in the tree yet ?

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