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| author |  Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
| 2023-12-28 17:47:03 +0300 |
|---|---|---|
| committer |  Andrew Morton <akpm@linux-foundation.org>
| 2024-01-08 15:27:15 -0800 |
| commit | fd37721803c6e73619108f76ad2e12a9aa5fafaf (patch) | |
| tree | 9f4b4af44314d4e0c38bda7a6558abed65186260 /Documentation/admin-guide | |
| parent | selftests/mm: add separate UFFDIO_MOVE test for PMD splitting (diff) | |
| download | linux-fd37721803c6e73619108f76ad2e12a9aa5fafaf.tar.gz linux-fd37721803c6e73619108f76ad2e12a9aa5fafaf.tar.bz2 linux-fd37721803c6e73619108f76ad2e12a9aa5fafaf.zip | |
mm, treewide: introduce NR_PAGE_ORDERS
NR_PAGE_ORDERS defines the number of page orders supported by the page
allocator, ranging from 0 to MAX_ORDER, MAX_ORDER + 1 in total.
NR_PAGE_ORDERS assists in defining arrays of page orders and allows for
more natural iteration over them.
[kirill.shutemov@linux.intel.com: fixup for kerneldoc warning]
Link: https://lkml.kernel.org/r/20240101111512.7empzyifq7kxtzk3@box
Link: https://lkml.kernel.org/r/20231228144704.14033-1-kirill.shutemov@linux.intel.com
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'Documentation/admin-guide')
| -rw-r--r-- | Documentation/admin-guide/kdump/vmcoreinfo.rst | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/Documentation/admin-guide/kdump/vmcoreinfo.rst b/Documentation/admin-guide/kdump/vmcoreinfo.rst index 78e4d2e7ba14..3f8769e46b07 100644 --- a/Documentation/admin-guide/kdump/vmcoreinfo.rst +++ b/Documentation/admin-guide/kdump/vmcoreinfo.rst @@ -172,7 +172,7 @@ variables. Offset of the free_list's member. This value is used to compute the number of free pages. -Each zone has a free_area structure array called free_area[MAX_ORDER + 1]. +Each zone has a free_area structure array called free_area[NR_PAGE_ORDERS]. The free_list represents a linked list of free page blocks. (list_head, next|prev) @@ -189,8 +189,8 @@ Offsets of the vmap_area's members. They carry vmalloc-specific information. Makedumpfile gets the start address of the vmalloc region from this. -(zone.free_area, MAX_ORDER + 1) -------------------------------- +(zone.free_area, NR_PAGE_ORDERS) +-------------------------------- Free areas descriptor. User-space tools use this value to iterate the free_area ranges. MAX_ORDER is used by the zone buddy allocator. |