On Tue, Feb 26, 2019 at 12:04 AM Michal Hocko <mhocko@xxxxxxxxxx> wrote: > > On Sun 24-02-19 20:34:03, Pingfan Liu wrote: > > There are NUMA machines with memory-less node. At present page allocator builds the > > full fallback info by build_zonelists(). But memblock allocator does not utilize > > this info. And for memory-less node, memblock allocator just falls back "node 0", > > without utilizing the nearest node. Unfortunately, the percpu section is allocated > > by memblock, which is accessed frequently after bootup. > > > > This series aims to improve the performance of per cpu section on memory-less node > > by feeding node's fallback info to memblock allocator on x86, like we do for page > > allocator. On other archs, it requires independent effort to setup node to cpumask > > map ahead. > > Do you have any numbers to tell us how much does this improve the > situation? Not yet. At present just based on the fact that we prefer to allocate per cpu area on local node. Thanks, Pingfan
