On 07/07/17 20:23, Wengang Wang wrote:
> log a message when we enter this situation:
> 1) we already allocated the max number of available grants from hypervisor
> and
> 2) we still need more (but the request fails because of 1)).
> 
> Sometimes the lack of grants causes IO hangs in xen_blkfront devices.
> Adding this log would help debuging.
> 
> Signed-off-by: Wengang Wang <wen.gang.w...@oracle.com>
> Reviewed-by: Konrad Rzeszutek Wilk <konrad.w...@oracle.com>
> Reviewed-by: Junxiao Bi <junxiao...@oracle.com>

Committed to xen/tip for-linus-4.13


Thanks,

Juergen

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