> No, there is no mmap. Like this:
>
> u64 my_counter = 0;
>
> ibv_set_mmu_counter(verbs, &my_counter);
> [..]
> while (my_counter != last_my_counter) {
> last_my_counter = my_counter;
> ibv_get_mmu_notifications(verbs, ...); // <- I am a memory barrier as
> well
> }
>
> The kernel 'syscall' ibv_set_mmu_counter would bind the given verbs to
> the 8 byte counter you specified without having to the mmap thing. As
> I understand it this is what perfevents does.
I was trying to look at how perf events handles this, and AFAICT it
looks like kernel/perf_event.c just supports mmap(). Can you expand on
what you meant here?
(I was trying to figure out how one would handle the case where
userspace gives us a counter in highmem -- doing kmap_atomic() seems to
be to only option but then I'm not sure if I want to deal with that...)
--
Roland Dreier <rola...@cisco.com> || For corporate legal information go to:
http://www.cisco.com/web/about/doing_business/legal/cri/index.html
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