On Wed 03-04-19 19:00:21, Zi Yan wrote: > From: Zi Yan <ziy@xxxxxxxxxx> > > Thanks to Dave Hansen's patches, which make PMEM as part of memory as NUMA nodes. > How to use PMEM along with normal DRAM remains an open problem. There are > several patchsets posted on the mailing list, proposing to use page migration to > move pages between PMEM and DRAM using Linux page replacement policy [1,2,3]. > There are some important problems not addressed in these patches: > 1. The page migration in Linux does not provide high enough throughput for us to > fully exploit PMEM or other use cases. > 2. Linux page replacement is running too infrequent to distinguish hot and cold > pages. [...] > 33 files changed, 4261 insertions(+), 162 deletions(-) For a patch _this_ large you should really start with a real world usecasing hitting bottlenecks with the current implementation. Should microbenchmarks can trigger bottlenecks much easier but do real application do the same? Please give us some numbers. -- Michal Hocko SUSE Labs
