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Re: [Qemu-devel] [PATCH v2 1/4] qom: provide root container for internal


From: Manos Pitsidianakis
Subject: Re: [Qemu-devel] [PATCH v2 1/4] qom: provide root container for internal objs
Date: Mon, 25 Sep 2017 11:34:58 +0300
User-agent: NeoMutt/20170609-57-1e93be (1.8.3)

On Mon, Sep 25, 2017 at 04:14:26PM +0800, Peter Xu wrote:
On Mon, Sep 25, 2017 at 09:14:21AM +0200, Andreas Färber wrote:
Am 25.09.2017 um 08:37 schrieb Peter Xu:
> We have object_get_objects_root() to keep user created objects, however
> no place for objects that will be used internally.  Create such a
> container for internal objects.
>
> CC: Andreas Färber <address@hidden>
> CC: Markus Armbruster <address@hidden>
> CC: Paolo Bonzini <address@hidden>
> Suggested-by: Daniel P. Berrange <address@hidden>
> Signed-off-by: Peter Xu <address@hidden>
> ---
>  include/qom/object.h | 10 ++++++++++
>  qom/object.c         |  5 +++++
>  2 files changed, 15 insertions(+)
>
> diff --git a/include/qom/object.h b/include/qom/object.h
> index f3e5cff..f567052 100644
> --- a/include/qom/object.h
> +++ b/include/qom/object.h
> @@ -1214,6 +1214,16 @@ Object *object_get_root(void);
>  Object *object_get_objects_root(void);
>
>  /**
> + * object_get_internal_root:
> + *
> + * Get the container object that holds internally used object
> + * instances. This is the object at path "/internal-objects"
> + *
> + * Returns: the internal object container
> + */
> +Object *object_get_internal_root(void);
> +
> +/**
>   * object_get_canonical_path_component:
>   *
>   * Returns: The final component in the object's canonical path.  The 
canonical
> diff --git a/qom/object.c b/qom/object.c
> index 3e18537..857cee7 100644
> --- a/qom/object.c
> +++ b/qom/object.c
> @@ -1370,6 +1370,11 @@ Object *object_get_objects_root(void)
>      return container_get(object_get_root(), "/objects");
>  }
>
> +Object *object_get_internal_root(void)
> +{
> +    return container_get(object_get_root(), "/internal-objects");

Whatever you expose in the QOM tree is no longer internal. Other name?

Hi, Andreas,

If you mean "info qom-tree" here, can we still treat it as internal?
Since after all it's not exposed in QMP (while IMHO QMP is the
official protocol for QEMU clients).  And IIUC some HMP commands do
dump some internal structs for debugging purpose (like: "info
ramblock").

Or, do you have any suggestion?

(I did think about something like "hidden-objects", but I believe they
are not hidden as well if we think they are not internal...)

Thanks,


Regards,
Andreas

If there's no need for internal IOThreads to be together with user created ones, a simple queue will be enough (include/qemu/queue.h).

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