Some newbie questions

[Avi Kivity]

On 08/17/2016 09:06 PM, David Smith wrote:
> On 08/17/2016 10:15 AM, Avi Kivity wrote:
>
> ... stuff deleted ...
>
>> My load indeed calls epoll_wait() at a high rate, with zero timeout.
>> But now it's completely dominated by tracing overhead.
> I'm not sure how much it will help, but one easy fix would be to replace
> all your '[pid(), tid()]' array indexing with just '[tid()]' array indexing.
>
> Try changing that and see if the tracing overhead goes down a bit.
>

Yeah, I forgot to do that.


But it's really unlikely to help, all the overhead is coming from 
syscall tracing, which I didn't ask for.