Disk I/O is still a big consumer of lowmem. "Luck, Tony" <tony.luck@xxxxxxxxx> wrote: >> If any significant percentage of memory is in ZONE_MOVABLE then the >memory >> hotplug people will have to deal with all the lowmem/highmem problems >> that used to be faced by 32-bit x86 with PAE enabled. > >While these problems may still exist on large systems - I think it >becomes >harder to construct workloads that run into problems. In those bad old >days >a significant fraction of lowmem was consumed by the kernel ... so it >was >pretty easy to find meta-data intensive workloads that would push it >over >a cliff. Here we are talking about systems with say 128GB per node >divided >into 64GB moveable and 64GB non-moveable (and I'd regard this as a >rather >low-end machine). Unless the workload consists of zillions of tiny >processes >all mapping shared memory blocks, the percentage of memory allocated to >the kernel is going to be tiny compared with the old 4GB days. > >-Tony -- Sent from my mobile phone. Please excuse brevity and lack of formatting. -- 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>