Re: [Xen-devel] [RFC Patch v2 13/16] xc_domain_save: flush cache before calling callbacks->postcopy()

[Wen Congyang <wency@xxxxxxxxxxxxxx>]

At 07/11/2013 09:43 PM, Andrew Cooper Wrote:
> On 11/07/13 09:35, Wen Congyang wrote:
>> callbacks->postcopy() may use the fd to transfer something to the
>> other end, so we should flush cache before calling callbacks->postcopy()
>>
>> Signed-off-by: Ye Wei <wei.ye1987@xxxxxxxxx>
>> Signed-off-by: Jiang Yunhong <yunhong.jiang@xxxxxxxxx>
>> Signed-off-by: Wen Congyang <wency@xxxxxxxxxxxxxx>
>> ---
> 
> This looks like it is a bugfix on its own, so perhaps might be better
> submitted as individual fix, rather than being mixed in with a huge
> series for new functionaltiy

Currently, callbacks->postcopy() does not use this fd to send anything
to the other end. So remus can work.

In colo mode, we will use this fd, so I fix it.

Thanks
Wen Congyang

> 
> ~Andrew
> 
>>  tools/libxc/xc_domain_save.c |    6 +++---
>>  1 files changed, 3 insertions(+), 3 deletions(-)
>>
>> diff --git a/tools/libxc/xc_domain_save.c b/tools/libxc/xc_domain_save.c
>> index fbc15e9..b477188 100644
>> --- a/tools/libxc/xc_domain_save.c
>> +++ b/tools/libxc/xc_domain_save.c
>> @@ -2034,9 +2034,6 @@ int xc_domain_save(xc_interface *xch, int io_fd, 
>> uint32_t dom, uint32_t max_iter
>>   out:
>>      completed = 1;
>>  
>> -    if ( !rc && callbacks->postcopy )
>> -        callbacks->postcopy(callbacks->data);
>> -
>>      /* guest has been resumed. Now we can compress data
>>       * at our own pace.
>>       */
>> @@ -2066,6 +2063,9 @@ int xc_domain_save(xc_interface *xch, int io_fd, 
>> uint32_t dom, uint32_t max_iter
>>  
>>      discard_file_cache(xch, io_fd, 1 /* flush */);
>>  
>> +    if ( !rc && callbacks->postcopy )
>> +        callbacks->postcopy(callbacks->data);
>> +
>>      /* Enable compression now, finally */
>>      compressing = (flags & XCFLAGS_CHECKPOINT_COMPRESS);
>>  
> 
> 
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