On Fri, May 15, 2020 at 03:44:43PM +0800, Michal Hocko wrote: > On Fri 08-05-20 15:25:17, Feng Tang wrote: > > When checking a performance change for will-it-scale scalability > > mmap test [1], we found very high lock contention for spinlock of > > percpu counter 'vm_committed_as': > > Btw. you are focusing on a microbenchmark here but I believe that there > are non-synthetic worklaods which would benefit from a larger batch. > E.g. large in memory databases which do large mmaps during startups > from multiple threads. I imagined cases like this too :) but was not sure there are such cases. So I only put down the the benchmark I've worked with in 0day. Thanks, Feng > -- > Michal Hocko > SUSE Labs
