From mboxrd@z Thu Jan  1 00:00:00 1970
From: Yang Hongyang <hongyang.yang@easystack.cn>
Subject: Re: [PATCH v3 2/5] remus: resume immediately if
 libxl__xc_domain_save_done() completes
Date: Tue, 26 Jan 2016 14:41:01 +0800
Message-ID: <56A714FD.9040301@easystack.cn>
References: <1452235131-1861-1-git-send-email-wency@cn.fujitsu.com>
	<1452235131-1861-3-git-send-email-wency@cn.fujitsu.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"; Format="flowed"
Content-Transfer-Encoding: 7bit
Return-path: <xen-devel-bounces@lists.xen.org>
In-Reply-To: <1452235131-1861-3-git-send-email-wency@cn.fujitsu.com>
List-Unsubscribe: <http://lists.xen.org/cgi-bin/mailman/options/xen-devel>,
	<mailto:xen-devel-request@lists.xen.org?subject=unsubscribe>
List-Post: <mailto:xen-devel@lists.xen.org>
List-Help: <mailto:xen-devel-request@lists.xen.org?subject=help>
List-Subscribe: <http://lists.xen.org/cgi-bin/mailman/listinfo/xen-devel>,
	<mailto:xen-devel-request@lists.xen.org?subject=subscribe>
Sender: xen-devel-bounces@lists.xen.org
Errors-To: xen-devel-bounces@lists.xen.org
To: Wen Congyang <wency@cn.fujitsu.com>, xen devel <xen-devel@lists.xen.org>, Andrew Cooper <andrew.cooper3@citrix.com>
Cc: Shriram Rajagopalan <rshriram@cs.ubc.ca>, Ian Jackson <ian.jackson@eu.citrix.com>, Changlong Xie <xiecl.fnst@cn.fujitsu.com>, Wei Liu <wei.liu2@citrix.com>, Ian Campbell <ian.campbell@citrix.com>
List-Id: xen-devel@lists.xenproject.org



On 01/08/2016 02:38 PM, Wen Congyang wrote:
> For example: if the secondary host is down, and we fail to send the data to
> the secondary host. xc_domain_save() returns 0. So in the function
> libxl__xc_domain_save_done(), rc is 0(the helper program exits normally),
> and retval is 0(it is xc_domain_save()'s return value). In such case, we
> just need to complete the stream.
>
> Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
> ---
>   tools/libxl/libxl_stream_write.c | 13 +++++++++++--
>   1 file changed, 11 insertions(+), 2 deletions(-)
>
> diff --git a/tools/libxl/libxl_stream_write.c b/tools/libxl/libxl_stream_write.c
> index 80d9208..82e7719 100644
> --- a/tools/libxl/libxl_stream_write.c
> +++ b/tools/libxl/libxl_stream_write.c
> @@ -354,8 +354,17 @@ void libxl__xc_domain_save_done(libxl__egc *egc, void *dss_void,
>        * alive, and check_all_finished() may have torn it down around us.
>        * If the stream is not still alive, we must not continue any work.
>        */
> -    if (libxl__stream_write_inuse(stream))
> -        write_emulator_xenstore_record(egc, stream);
> +    if (libxl__stream_write_inuse(stream)) {
> +        if (dss->remus)
> +            /*
> +             * For remus, if libxl__xc_domain_save_done() completes,

xc_domain_save() completes.

> +             * there was an error sending data to the secondary.
> +             * Resume the primary ASAP.
> +             */
> +            stream_complete(egc, stream, 0);
> +        else
> +            write_emulator_xenstore_record(egc, stream);
> +    }
>   }
>
>   static void write_emulator_xenstore_record(libxl__egc *egc,
>

-- 
Thanks,
Yang