Messages in this thread |  | | Subject | RE: [PATCH v2 0/5] Add movablecore_map boot option | From | "H. Peter Anvin" <> | Date | Thu, 29 Nov 2012 19:28:12 -0800 |
| |
Disk I/O is still a big consumer of lowmem.
"Luck, Tony" <tony.luck@intel.com> 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.
|  |