On 10/8/20 12:53 AM, yulei.kernel@xxxxxxxxx wrote: > diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt > index a1068742a6df..da15d4fc49db 100644 > --- a/Documentation/admin-guide/kernel-parameters.txt > +++ b/Documentation/admin-guide/kernel-parameters.txt > @@ -980,6 +980,44 @@ > The filter can be disabled or changed to another > driver later using sysfs. > > + dmem=[!]size[KMG] > + [KNL, NUMA] When CONFIG_DMEM is set, this means > + the size of memory reserved for dmemfs on each numa NUMA > + memory node and 'size' must be aligned to the default > + alignment that is the size of memory section which is > + 128M on default on x86_64. If set '!', such amount of by default > + memory on each node will be owned by kernel and dmemfs > + own the rest of memory on each node. owns > + Example: Reserve 4G memory on each node for dmemfs > + dmem = 4G IIRC, you don't want spaces in this example. Or did you check? Does the kernel's command line parser accept & ignore spaces like these? > + > + dmem=[!]size[KMG]:align[KMG] > + [KNL, NUMA] Ditto. 'align' should be power of two and > + it's not smaller than the default alignment. Also drop "it's" > + 'size' must be aligned to 'align'. > + Example: Bad dmem parameter because 'size' misaligned > + dmem=0x40200000:1G > + > + dmem=size[KMG]@addr[KMG] > + [KNL] When CONFIG_DMEM is set, this marks specific > + memory as reserved for dmemfs. Region of memory will be > + used by dmemfs, from addr to addr + size. Reserving a > + certain memory region for kernel is illegal so '!' is > + forbidden. Should not assign 'addr' to 0 because kernel > + will occupy fixed memory region begin at 0 address. beginning > + Ditto, 'size' and 'addr' must be aligned to default > + alignment. > + Example: Exclude memory from 5G-6G for dmemfs. > + dmem=1G@5G > + > + dmem=size[KMG]@addr[KMG]:align[KMG] > + [KNL] Ditto. 'align' should be power of two and it's Drop "it's" > + not smaller than the default alignment. Also 'size' > + and 'addr' must be aligned to 'align'. Specially, > + '@addr' and ':align' could occur in any order. > + Example: Exclude memory from 5G-6G for dmemfs. > + dmem=1G:1G@5G > + > driver_async_probe= [KNL] > List of driver names to be probed asynchronously. > Format: <driver_name1>,<driver_name2>... -- ~Randy Reported-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
