@@ -100,38 +100,49 @@ with a huge page size selection parameter "hugepagesz=<size>". <size> must
be specified in bytes with optional scale suffix [kKmMgG]. The default huge
page size may be selected with the "default_hugepagesz=<size>" boot parameter.
-Hugetlb boot command line parameter semantics
-hugepagesz - Specify a huge page size. Used in conjunction with hugepages
+Hugetlb
+ boot command line parameter semantics
+hugepagesz
+ Specify a huge page size. Used in conjunction with hugepages
parameter to preallocate a number of huge pages of the specified
size. Hence, hugepagesz and hugepages are typically specified in
- pairs such as:
+ pairs such as::
+
hugepagesz=2M hugepages=512
+
hugepagesz can only be specified once on the command line for a
specific huge page size. Valid huge page sizes are architecture
dependent.
-hugepages - Specify the number of huge pages to preallocate. This typically
+hugepages
+ Specify the number of huge pages to preallocate. This typically
follows a valid hugepagesz or default_hugepagesz parameter. However,
if hugepages is the first or only hugetlb command line parameter it
implicitly specifies the number of huge pages of default size to
allocate. If the number of huge pages of default size is implicitly
specified, it can not be overwritten by a hugepagesz,hugepages
parameter pair for the default size.
- For example, on an architecture with 2M default huge page size:
+
+ For example, on an architecture with 2M default huge page size::
+
hugepages=256 hugepagesz=2M hugepages=512
+
will result in 256 2M huge pages being allocated and a warning message
indicating that the hugepages=512 parameter is ignored. If a hugepages
parameter is preceded by an invalid hugepagesz parameter, it will
be ignored.
-default_hugepagesz - Specify the default huge page size. This parameter can
+default_hugepagesz
+ pecify the default huge page size. This parameter can
only be specified once on the command line. default_hugepagesz can
optionally be followed by the hugepages parameter to preallocate a
specific number of huge pages of default size. The number of default
sized huge pages to preallocate can also be implicitly specified as
mentioned in the hugepages section above. Therefore, on an
- architecture with 2M default huge page size:
+ architecture with 2M default huge page size::
+
hugepages=256
default_hugepagesz=2M hugepages=256
hugepages=256 default_hugepagesz=2M
+
will all result in 256 2M huge pages being allocated. Valid default
huge page size is architecture dependent.
Some new command line parameters were added at hugetlbpage.rst. Adjust them in order to properly parse that part of the file, avoiding those warnings: Documentation/admin-guide/mm/hugetlbpage.rst:105: WARNING: Unexpected indentation. Documentation/admin-guide/mm/hugetlbpage.rst:108: WARNING: Unexpected indentation. Documentation/admin-guide/mm/hugetlbpage.rst:109: WARNING: Block quote ends without a blank line; unexpected unindent. Documentation/admin-guide/mm/hugetlbpage.rst:112: WARNING: Block quote ends without a blank line; unexpected unindent. Documentation/admin-guide/mm/hugetlbpage.rst:120: WARNING: Unexpected indentation. Documentation/admin-guide/mm/hugetlbpage.rst:121: WARNING: Block quote ends without a blank line; unexpected unindent. Documentation/admin-guide/mm/hugetlbpage.rst:132: WARNING: Unexpected indentation. Documentation/admin-guide/mm/hugetlbpage.rst:135: WARNING: Block quote ends without a blank line; unexpected unindent. Fixes: cd9fa28b5351 ("hugetlbfs: clean up command line processing") Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org> --- Documentation/admin-guide/mm/hugetlbpage.rst | 25 ++++++++++++++------ 1 file changed, 18 insertions(+), 7 deletions(-)