Re: [Qemu-devel] qemu AIO worker threads change causes Guest OS hangup

[Paolo Bonzini]

On 06/03/2016 03:42, Huaicheng Li (coperd) wrote:
> 
>> On Mar 1, 2016, at 3:01 PM, Paolo Bonzini <address@hidden
>> <mailto:address@hidden>> wrote:
>>
>> This is done
>> because the worker threads only care about the queued request list, not
>> about active or completed requests.
> 
> Do you think it would be useful to add an API for inserting one request
> back 
> to the queued list? For example, In case of request failure, we can
> insert it 
> back to the list for re-handling according to some rule before returning
> it directly 
> to guest os. 

Hi,

this is usually handled at a higher level than the thread pool.  See for
example hw/block/virtio-blk.c's restart mechanism, which is enabled with
the rerror=stop and werror=stop options of -drive.

Paolo