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 <gthe...@google.com> 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 from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
