On Wed 23-09-15 00:21:33, Greg Thelen wrote: > > Andrew Morton wrote: > > > On Tue, 22 Sep 2015 17:42:13 -0700 Greg Thelen <gthelen@xxxxxxxxxx> wrote: [...] > >> I assume it's pretty straightforward to create generic > >> percpu_counter_array routines which memcg could use. Possibly something > >> like this could be made general enough could be created to satisfy > >> vmstat, but less clear. > >> > >> [1] http://www.spinics.net/lists/cgroups/msg06216.html > >> [2] https://lkml.org/lkml/2014/9/11/1057 > > > > That all sounds rather bogus to me. __percpu_counter_add() doesn't > > modify struct percpu_counter at all except for when the cpu-local > > counter overflows the configured batch size. And for the memcg > > application I suspect we can set the batch size to INT_MAX... > > Nod. The memory usage will be a bit larger, but the code reuse is > attractive. I dusted off Vladimir's > https://lkml.org/lkml/2014/9/11/710. Next step is to benchmark it > before posting. I am definitely in favor of using generic per-cpu counters. -- Michal Hocko SUSE Labs -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>