Re: [Qemu-devel] [PATCH] Add warmup phase for live migration of large memory apps

[Stefan Hajnoczi <stefanha@gmail.com>]

On Wed, May 11, 2011 at 8:58 AM, Shribman, Aidan <aidan.shribman@sap.com> wrote:
> From: Aidan Shribman <aidan.shribman@sap.com>
>
> [PATCH] Add warmup phase for live migration of large memory apps
>
> By invoking "migrate -w <url>" we initiate a background live-migration
> transferring of dirty pages continuously until invocation of "migrate_end"
> which attempts to complete the live migration operation.

What is the purpose of this patch?  How and when do I use it?

Some nitpicks:

> @@ -81,6 +83,11 @@ int do_migrate(Monitor *mon, const QDict *qdict, QObject **ret_data)
>     int blk = qdict_get_try_bool(qdict, "blk", 0);
>     int inc = qdict_get_try_bool(qdict, "inc", 0);
>     const char *uri = qdict_get_str(qdict, "uri");
> +    is_migrate_warmup = qdict_get_try_bool(qdict, "warmup", 0);
> +
> +    if (is_migrate_warmup) {
> +        detach = 1; /* as we need migrate_end to complte */

s/complte/complete/

> +       }

Please follow the coding style and put the closing curly brace on the
same column as the 'if' statement.

> +int qemu_savevm_state_warmup(Monitor *mon, QEMUFile *f) {
> +    int ret = 1;

1 is overwritten immediately.

Stefan