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Re: [Qemu-devel] [PATCH v11 14/15] rdma: introduce MIG_STATE_NONE and ch

From: Juan Quintela
Subject: Re: [Qemu-devel] [PATCH v11 14/15] rdma: introduce MIG_STATE_NONE and change MIG_STATE_SETUP state transition
Date: Tue, 25 Jun 2013 11:49:38 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.2 (gnu/linux)

address@hidden wrote:
> From: "Michael R. Hines" <address@hidden>
> As described in the previous patch, until now, the MIG_STATE_SETUP
> state was not really a 'formal' state. It has been used as a 'zero' state
> (what we're calling 'NONE' here) and QEMU has been unconditionally 
> transitioning
> into this state when the QMP migration command was called. Instead we want to
> introduce MIG_STATE_NONE, which is our starting state in the state machine, 
> and
> then immediately transition into the MIG_STATE_SETUP state when the QMP 
> migrate
> command is issued.
> In order to do this, we must delay the transition into MIG_STATE_ACTIVE until
> later in the migration_thread(). This is done to be able to timestamp the 
> amount of
> time spent in the SETUP state for proper accounting to the user during
> an RDMA migration.
> Furthermore, the management software, until now, has never been aware of the
> existence of the SETUP state whatsoever. This must change, because, timing of 
> this
> state implies that the state actually exists.
> These two patches cannot be separated because the 'query_migrate' QMP
> switch statement needs to know how to handle this new state transition.
> Tested-by: Michael R. Hines <address@hidden>
> Signed-off-by: Michael R. Hines <address@hidden>

> @@ -316,6 +321,7 @@ static void migrate_fd_cancel(MigrationState *s)
>  {
>      DPRINTF("cancelling migration\n");
> +    migrate_set_state(s, MIG_STATE_SETUP, MIG_STATE_CANCELLED);
>      migrate_set_state(s, MIG_STATE_ACTIVE, MIG_STATE_CANCELLED);
>  }

This chunk is wrong.

we can call qme_migrate_cancel() at any point,  and it is going to be
called normally from MIG_STATE_ACTIVE.

    migrate_set_satet(s, s->state,  MIG_STATE_CANCELLED)

should do the trick.  Or something like that,  what do you think?

Later,  Juan.

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