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From: Luiz Capitulino <lcapitulino@redhat.com>
To: Markus Armbruster <armbru@redhat.com>
Cc: aliguori@us.ibm.com, qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH 05/18] Monitor: Drop is_async_return()
Date: Wed, 29 Sep 2010 10:28:21 -0300	[thread overview]
Message-ID: <20100929102821.6b80eac4@doriath> (raw)
In-Reply-To: <m3eiccpzh7.fsf@blackfin.pond.sub.org>

On Wed, 29 Sep 2010 13:21:08 +0200
Markus Armbruster <armbru@redhat.com> wrote:

> Luiz Capitulino <lcapitulino@redhat.com> writes:
> 
> > If I understood it correcty, the is_async_return() logic was only
> > used to prevent QMP from issuing duplicated success responses
> > for asynchronous handlers.
> >
> > However, QMP doesn't use do_info() anymore so this is dead logic
> > and (hopefully) can be safely dropped.
> 
> Looks like it.
> 
> Does anybody understand this async monitor stuff?  

I guess I do, but every now and then it surprises me someway.

> It's used only for
> "info balloon" and "balloon".  It keeps getting in the way.  I'm sorely
> tempted to rip it out and reimplement it after we're done refactoring
> the monitor.

I've considered doing that, but then I realized that it's actually a good
interface with two serious problems:

  1. It's half done. A true async interface would provide a way to list and
     cancel requests (at the API level and in QMP/HMP)

  2. It got too complex, and that's so because of the current state of the
     Monitor code

My optimistic side is telling me that both problems can be solved during
the refactoring process: Monitor code will be simplified and the current
async interface could be used as the basis for the internal QMP API (which
should be async-only, but that's another discussion).

  reply	other threads:[~2010-09-29 13:28 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-09-16 20:20 [Qemu-devel] [PATCH 00/18] Monitor: split HMP and QMP dispatch tables Luiz Capitulino
2010-09-16 20:20 ` [Qemu-devel] [PATCH 01/18] Monitor: Introduce find_dispatch_table() Luiz Capitulino
2010-09-29  9:29   ` Markus Armbruster
2010-09-16 20:20 ` [Qemu-devel] [PATCH 02/18] QMP: handle_qmp_command(): Move 'cmd' sanity check Luiz Capitulino
2010-09-16 20:20 ` [Qemu-devel] [PATCH 03/18] QMP: Don't use do_info() Luiz Capitulino
2010-09-29 11:13   ` Markus Armbruster
2010-09-16 20:20 ` [Qemu-devel] [PATCH 04/18] Monitor: Drop QMP bits from do_info() Luiz Capitulino
2010-09-16 20:20 ` [Qemu-devel] [PATCH 05/18] Monitor: Drop is_async_return() Luiz Capitulino
2010-09-29 11:21   ` Markus Armbruster
2010-09-29 13:28     ` Luiz Capitulino [this message]
2010-09-29 15:11       ` Anthony Liguori
2010-09-29 15:11       ` Anthony Liguori
2010-09-16 20:20 ` [Qemu-devel] [PATCH 06/18] Monitor: Convert do_info() back to HMP Luiz Capitulino
2010-09-16 20:20 ` [Qemu-devel] [PATCH 07/18] Monitor: Introduce the qemu-monitor-qmp.hx file Luiz Capitulino
2010-09-16 20:20 ` [Qemu-devel] [PATCH 08/18] QMP: Introduce qmp_find_cmd() Luiz Capitulino
2010-09-16 20:20 ` [Qemu-devel] [PATCH 09/18] QMP: Introduce command dispatch table Luiz Capitulino
2010-09-29 11:31   ` Markus Armbruster
2010-09-29 13:47     ` Luiz Capitulino
2010-09-29 14:23       ` Markus Armbruster
2010-09-16 20:20 ` [Qemu-devel] [PATCH 10/18] QMP: Introduce query commands " Luiz Capitulino
2010-09-16 20:20 ` [Qemu-devel] [PATCH 11/18] QMP: Simplify do_info_commands() Luiz Capitulino
2010-09-16 20:20 ` [Qemu-devel] [PATCH 12/18] QMP: Small cleanup in handle_qmp_command() Luiz Capitulino
2010-09-16 20:20 ` [Qemu-devel] [PATCH 13/18] Monitor: Drop QMP info from the qemu-monitor.hx file Luiz Capitulino
2010-09-16 20:21 ` [Qemu-devel] [PATCH 14/18] Monitor: Drop monitor_cmd_user_only() Luiz Capitulino
2010-09-16 20:21 ` [Qemu-devel] [PATCH 15/18] Monitor: Rename monitor_handler_ported() Luiz Capitulino
2010-09-16 20:21 ` [Qemu-devel] [PATCH 16/18] Monitor: Rename monitor_handler_is_async() Luiz Capitulino
2010-09-16 20:21 ` [Qemu-devel] [PATCH 17/18] Monitor: Directly call QObject handlers Luiz Capitulino
2010-09-16 20:21 ` [Qemu-devel] [PATCH 18/18] QMP: Introduce qmp_call_cmd() Luiz Capitulino
2010-09-21 12:56 ` [Qemu-devel] [PATCH 00/18] Monitor: split HMP and QMP dispatch tables Anthony Liguori
2010-09-29 11:41   ` Markus Armbruster

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