On Fri, May 22, 2020 at 1:07 PM Kanthi P <Pavuluri.kanthi@...> wrote:
Hi,
I’ve been reading that hash map’s update element is atomic and also that we can use BPF_XADD to make the entire map update atomically.
BPF_XADD is to make one map element inside the kenel to update atomically.
Could you filx an issue with more details? This way, we will have a better record.
But I think that doesn’t guarantee that these updates are thread safe, meaning one cpu core can overwrite other core’s update.
Not sure what do you mean here. yes, one cpu updated a map element and the other can modify it. What kind of primitive do you want? compare-and-exchange?
Is there a clean way of keeping them thread safe. Unfortunately I can’t use per-cpu maps as I need global counters.
And spin locks sounds a costly operation. Can you please throw some light?
