Hi dear Fan San, On 10/11/17 at 04:23pm, Chao Fan wrote: > On Wed, Oct 11, 2017 at 03:55:13PM +0800, Baoquan He wrote: > >Hi Fan San, > >> 1. Get and parse the srat table before kernel extracted, then mark the memory > >> region in movable node which should be avoided in kaslr. > >> I have send the patch: > >> https://www.spinics.net/lists/kernel/msg2595546.html > >> But the change is large and then here is the second method. > >> > >> 2. Extend the movable_node to movable_node=nn@ss, in which nn means > >> the size of memory in immovable node, and ss means the start position of > >> this memory region. > >> But it brings another question, it may be a little difficult for a normal > >> user to specify the nn and ss. Because it's hard for a user to know the value > >> of the memory in immovable node. > >> So I wonder if it's good to add a interface in /sys, like: > >> # cat /sys/device/system/memory/immovable_node > > > Hi Baoquan, > > Thanks for your reply, > > >You can post patch. By the way, can the existing > >/sys/devices/system/memory/memoryX/removable be used instead? > > I ever search the interfaces of /sys/devices/system/memory/, and noticed > this "removable", it does be able to help us judge it's removable or not. > But we should also get the information of the memory length and start position > by other interface. If there is a interface that show the nn and ss, we > can use them and change grub directly. > And there are more "memoryX" in one node. In my machine, I can see > memory0(linked to /sys/devices/system/memory/memory0) - memory7 in > /sys/devices/system/node/node0. And total memory38 for 4 nodes. I think > it's a little heavy to handle every memoryX. > But in SRAT table, one node has one or two memory regions. So I thinks > it's more straight and easy to use. How do you think about it? I am fine, I just mention it. Then please show your code envelopped in well formatted patch. Thanks Baoquan > > > >> nn@ss > >> nn@ss > >> ... > >> to show the two value. > >> When srat table is parsed in acpi_parse_memory_affinity, fill the value > >> and user can get and use them. > >> > >> If anyone has a better method, please let me know. > >> Any comments will be welcome. > >> > >> Thanks, > >> Chao Fan > >> > >> > > > > > > -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
