Hi Xishi, > On 2015/10/15 21:32, Taku Izumi wrote: > > > Xeon E7 v3 based systems supports Address Range Mirroring > > and UEFI BIOS complied with UEFI spec 2.5 can notify which > > ranges are reliable (mirrored) via EFI memory map. > > Now Linux kernel utilize its information and allocates > > boot time memory from reliable region. > > > > My requirement is: > > - allocate kernel memory from reliable region > > - allocate user memory from non-reliable region > > > > In order to meet my requirement, ZONE_MOVABLE is useful. > > By arranging non-reliable range into ZONE_MOVABLE, > > reliable memory is only used for kernel allocations. > > > > This patch extends existing "kernelcore" option and > > introduces kernelcore=reliable option. By specifying > > "reliable" instead of specifying the amount of memory, > > non-reliable region will be arranged into ZONE_MOVABLE. > > > > Earlier discussion is at: > > https://lkml.org/lkml/2015/10/9/24 > > > > Hi Taku, > > If user don't want to waste a lot of memory, and he only set > a few memory to mirrored memory, then the kernelcore is very > small, right? That means OS will have a very small normal zone > and a very large movable zone.
Right. > Kernel allocation could only use the unmovable zone. As the > normal zone is very small, the kernel allocation maybe OOM, > right? Right. > Do you mean that we will reuse the movable zone in short-term > solution and create a new zone(mirrored zone) in future? If there is that kind of requirements, I don't oppose creating a new zone. Sincerely, Taku Izumi -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
