On Fri, 25 Sep 2020 17:15:17 +0200 Eric Dumazet wrote: > On 9/25/20 5:00 PM, Jakub Kicinski wrote: > > Is this_cpu_inc() in itself atomic? To answer my own question - it is :) > > unlikely((val & (COOKIE_LOCAL_BATCH - 1)) == 0)) > > > > Can we reasonably assume we won't have more than 4k CPUs and just > > statically divide this space by encoding CPU id in top bits? > > This might give some food to side channel attacks, since this would > give an indication of cpu that allocated the id. > > Also, I hear that some distros enabled 8K cpus. Ok :(
