diff options
| author | Mike Rapoport <rppt@linux.ibm.com> | 2022-03-10 10:27:36 +0200 |
|---|---|---|
| committer | Jonathan Corbet <corbet@lwn.net> | 2022-03-16 15:57:56 -0600 |
| commit | 75c05fabb873367d9e64f063dda8a310c4c58826 (patch) | |
| tree | 6e785027fa139c3717292c090cef6dc87445e381 /Documentation/admin-guide | |
| parent | c01c2e435db8b62bd67a50e9622d59ca7c7953b7 (diff) | |
docs/kernel-parameters: update description of mem=
The existing description of mem= does not cover all the cases and
differences between how architectures treat it.
Extend the description to match the code.
Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Link: https://lore.kernel.org/r/20220310082736.1346366-1-rppt@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Diffstat (limited to 'Documentation/admin-guide')
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index f5a27f067db9..5b84cca62990 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -2827,6 +2827,9 @@ For details see: Documentation/admin-guide/hw-vuln/mds.rst + mem=nn[KMG] [HEXAGON] Set the memory size. + Must be specified, otherwise memory size will be 0. + mem=nn[KMG] [KNL,BOOT] Force usage of a specific amount of memory Amount of memory to be used in cases as follows: @@ -2834,6 +2837,13 @@ 2 when the kernel is not able to see the whole system memory; 3 memory that lies after 'mem=' boundary is excluded from the hypervisor, then assigned to KVM guests. + 4 to limit the memory available for kdump kernel. + + [ARC,MICROBLAZE] - the limit applies only to low memory, + high memory is not affected. + + [ARM64] - only limits memory covered by the linear + mapping. The NOMAP regions are not affected. [X86] Work as limiting max address. Use together with memmap= to avoid physical address space collisions. @@ -2844,6 +2854,14 @@ in above case 3, memory may need be hot added after boot if system memory of hypervisor is not sufficient. + mem=nn[KMG]@ss[KMG] + [ARM,MIPS] - override the memory layout reported by + firmware. + Define a memory region of size nn[KMG] starting at + ss[KMG]. + Multiple different regions can be specified with + multiple mem= parameters on the command line. + mem=nopentium [BUGS=X86-32] Disable usage of 4MB pages for kernel memory. |