On 07/13/2016 07:40 PM, Paolo Bonzini wrote:
On 13/07/2016 13:40, Cao jin wrote:
On 07/13/2016 06:21 PM, Paolo Bonzini wrote:
On 13/07/2016 11:06, Cao jin wrote:
When passed argument 'ns' is 0, macro DIV_ROUND_UP will return 0 also.
It's potentially slower though.
Is it because the function in the i/o loop path, so the potentially
extra arithmetical instructions matters?
It is quite common for ns to be zero, for example if a bottom half has
to be invoked.
I see. I need dig deeper to understand the wholely I/O mechanism. Thanks
Paolo!
However, qemu_timeout_ns_to_ms is not used in the really important path
(which is aio_poll in aio-posix.c) so I guess your patch is okay.
Thanks,
Paolo
--
Yours Sincerely,
Cao jin
