On Wed, 24 Aug 2022 21:41:42 -0700 Shakeel Butt <shakeelb@xxxxxxxxxx> wrote: > > Did you evaluate the effects of using a per-cpu counter of some form? > > Do you mean per-cpu counter for usage or something else? percpu_counter, perhaps. Or some hand-rolled thing if that's more suitable. > The usage > needs to be compared against the limits and accumulating per-cpu is > costly particularly on larger machines, Well, there are tricks one can play. For example, only run __percpu_counter_sum() when `usage' is close to its limit. I'd suggest flinging together a prototype which simply uses percpu_counter_read() all the time. If the performance testing results are sufficiently promising, then look into the accuracy issues.
