On Fri, Nov 20, 2020 at 07:15:07PM +0300, Andrey Gruzdev wrote:
> Yeah, I think we can re-use the postcopy queue code for faulting pages. I'm
> worring a little about some additional overhead dealing with urgent request
> semaphore. Also, the code won't change a lot, something like:
>
> [...]
> /* In case of 'write-tracking' migration we first try
> * to poll UFFD and sse if we have write page fault event */
> poll_fault_page(rs);
>
> again = true;
> found = get_queued_page(rs, &pss);
>
> if (!found) {
> /* priority queue empty, so just search for something dirty */
> found = find_dirty_block(rs, &pss, &again);
> }
> [...]
Could I ask what's the "urgent request semaphore"? Thanks,
--
Peter Xu
