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From: Markus Armbruster <armbru@redhat.com>
To: Jes.Sorensen@redhat.com
Cc: pbonzini@redhat.com, Anthony Liguori <aliguori@us.ibm.com>,
	qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH 5/7] Switch migrate_set_speed() to take an 'o' argument rather than a float.
Date: Mon, 11 Oct 2010 11:03:41 +0200	[thread overview]
Message-ID: <m3mxql3xua.fsf@blackfin.pond.sub.org> (raw)
In-Reply-To: <1286529360-5715-6-git-send-email-Jes.Sorensen@redhat.com> (Jes Sorensen's message of "Fri, 8 Oct 2010 11:15:58 +0200")

[cc: Anthony, please review the proposed incompatible change of the
human monitor]

Jes.Sorensen@redhat.com writes:

> From: Jes Sorensen <Jes.Sorensen@redhat.com>
>
> Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
> ---
>  hmp-commands.hx |    2 +-
>  migration.c     |    4 ++--
>  2 files changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/hmp-commands.hx b/hmp-commands.hx
> index 81999aa..95bdb91 100644
> --- a/hmp-commands.hx
> +++ b/hmp-commands.hx
> @@ -754,7 +754,7 @@ ETEXI
>  
>      {
>          .name       = "migrate_set_speed",
> -        .args_type  = "value:f",
> +        .args_type  = "value:o",
>          .params     = "value",
>          .help       = "set maximum speed (in bytes) for migrations",
>          .user_print = monitor_user_noop,
> diff --git a/migration.c b/migration.c
> index 468d517..9ee8b17 100644
> --- a/migration.c
> +++ b/migration.c
> @@ -132,10 +132,10 @@ int do_migrate_cancel(Monitor *mon, const QDict *qdict, QObject **ret_data)
>  
>  int do_migrate_set_speed(Monitor *mon, const QDict *qdict, QObject **ret_data)
>  {
> -    double d;
> +    int64_t d;
>      FdMigrationState *s;
>  
> -    d = qdict_get_double(qdict, "value");
> +    d = qdict_get_int(qdict, "value");
>      d = MAX(0, MIN(UINT32_MAX, d));
>      max_throttle = d;

As noted before, this is an incompatible change of the human monitor
command: unit now defaults to 'M'.  This must be noted *prominently* in
the commit message.  Best in the subject.

Incompatible changes can break tools.  Quick grep of libvirt:

src/qemu/qemu_monitor_json.c:    cmd = qemuMonitorJSONMakeCommand("migrate_set_speed",
src/qemu/qemu_monitor_text.c:    if (virAsprintf(&cmd, "migrate_set_speed %lum", bandwidth) < 0) {

Looks like we're safe here.

Anthony, is this incompatibility okay?

Help should be updated in the same patch; please squash 6/7 into 5/7.

  reply	other threads:[~2010-10-11  9:13 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-10-08  9:15 [Qemu-devel] [PATCH v4 0/7] Introduce strtosz and make use of it Jes.Sorensen
2010-10-08  9:15 ` [Qemu-devel] [PATCH 1/7] Introduce strtosz() library function to convert a string to a byte count Jes.Sorensen
2010-10-11  8:51   ` Markus Armbruster
2010-10-11 12:45     ` Jes Sorensen
2010-10-11 14:39       ` Markus Armbruster
2010-10-08  9:15 ` [Qemu-devel] [PATCH 2/7] Support human unit formats in strtosz, eg. 1.0G Jes.Sorensen
2010-10-08  9:37   ` Stefan Weil
2010-10-08  9:15 ` [Qemu-devel] [PATCH 3/7] Add more error handling to strtosz() Jes.Sorensen
2010-10-08  9:38   ` Stefan Weil
2010-10-08  9:15 ` [Qemu-devel] [PATCH 4/7] Add support for 'o' octet (bytes) format as monitor parameter Jes.Sorensen
2010-10-08  9:15 ` [Qemu-devel] [PATCH 5/7] Switch migrate_set_speed() to take an 'o' argument rather than a float Jes.Sorensen
2010-10-11  9:03   ` Markus Armbruster [this message]
2010-10-11  9:26     ` Paolo Bonzini
2010-10-11  9:58     ` Jes Sorensen
2010-10-08  9:15 ` [Qemu-devel] [PATCH 6/7] Clarify default values in migration speed argument in monitor Jes.Sorensen
2010-10-08 16:21   ` [Qemu-devel] " Paolo Bonzini
2010-10-11  6:45     ` Jes Sorensen
2010-10-08  9:16 ` [Qemu-devel] [PATCH 7/7] Remove obsolete 'f' double parameter type Jes.Sorensen

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