Re: [Qemu-devel] [PATCH] QEMUFileBuffered: indicate that we're ready when the underlying file is ready

[Avi Kivity <avi@redhat.com>]

  On 08/19/2010 06:19 PM, Anthony Liguori wrote:
> On 07/07/2010 11:44 AM, Avi Kivity wrote:
>> QEMUFileBuffered stops writing when the underlying QEMUFile is not 
>> ready,
>> and tells its producer so.  However, when the underlying QEMUFile 
>> becomes
>> ready, it neglects to pass that information along, resulting in stoppage
>> of all data until the next tick (a tenths of a second).
>>
>> Usually this doesn't matter, because most QEMUFiles used with 
>> QEMUFileBuffered
>> are almost always ready, but in the case of exec: migration this is 
>> not true,
>> due to the small pipe buffers used to connect to the target process.  
>> The
>> result is very slow migration.
>>
>> Fix by detecting the readiness notification and propagating it.  The 
>> detection
>> is a little ugly since QEMUFile overloads put_buffer() to send it, 
>> but that's
>> the suject for a different patch.
>>
>> Signed-off-by: Avi Kivity<avi@redhat.com>\
>
> Applied.  Thanks.

Should be applied to stable-0.13 as well.

-- 
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