RE: [PATCH net] hvsock: fix epollout hang from race condition

[Dexuan Cui]

> From: Sunil Muthuswamy <sunilmut@xxxxxxxxxxxxx>
> Sent: Wednesday, June 12, 2019 2:19 PM
>  ...
> The fix is to set the pending size to the default size and never change it.
> This way the host will always notify the guest whenever the writable space
> is bigger than the pending size. The host is already optimized to *only*
> notify the guest when the pending size threshold boundary is crossed and
> not everytime.
> 
> This change also reduces the cpu usage somewhat since
> hv_stream_has_space()
> is in the hotpath of send:
> vsock_stream_sendmsg()->hv_stream_has_space()
> Earlier hv_stream_has_space was setting/clearing the pending size on every
> call.
> 
> Signed-off-by: Sunil Muthuswamy <sunilmut@xxxxxxxxxxxxx>

Hi Sunil, thanks for the fix! It looks good.

Reviewed-by: Dexuan Cui <decui@xxxxxxxxxxxxx>