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1 | #ifndef PAGE_FLAGS_LAYOUT_H |
2 | #define PAGE_FLAGS_LAYOUT_H |
3 | |
4 | #include <linux/numa.h> |
5 | #include <generated/bounds.h> |
6 | |
7 | /* |
8 | * When a memory allocation must conform to specific limitations (such |
9 | * as being suitable for DMA) the caller will pass in hints to the |
10 | * allocator in the gfp_mask, in the zone modifier bits. These bits |
11 | * are used to select a priority ordered list of memory zones which |
12 | * match the requested limits. See gfp_zone() in include/linux/gfp.h |
13 | */ |
14 | #if MAX_NR_ZONES < 2 |
15 | #define ZONES_SHIFT 0 |
16 | #elif MAX_NR_ZONES <= 2 |
17 | #define ZONES_SHIFT 1 |
18 | #elif MAX_NR_ZONES <= 4 |
19 | #define ZONES_SHIFT 2 |
20 | #else |
21 | #error ZONES_SHIFT -- too many zones configured adjust calculation |
22 | #endif |
23 | |
24 | #ifdef CONFIG_SPARSEMEM |
25 | #include <asm/sparsemem.h> |
26 | |
27 | /* SECTION_SHIFT #bits space required to store a section # */ |
28 | #define SECTIONS_SHIFT (MAX_PHYSMEM_BITS - SECTION_SIZE_BITS) |
29 | |
30 | #endif /* CONFIG_SPARSEMEM */ |
31 | |
32 | /* |
33 | * page->flags layout: |
34 | * |
35 | * There are five possibilities for how page->flags get laid out. The first |
36 | * pair is for the normal case without sparsemem. The second pair is for |
37 | * sparsemem when there is plenty of space for node and section information. |
38 | * The last is when there is insufficient space in page->flags and a separate |
39 | * lookup is necessary. |
40 | * |
41 | * No sparsemem or sparsemem vmemmap: | NODE | ZONE | ... | FLAGS | |
42 | * " plus space for last_nid: | NODE | ZONE | LAST_NID ... | FLAGS | |
43 | * classic sparse with space for node:| SECTION | NODE | ZONE | ... | FLAGS | |
44 | * " plus space for last_nid: | SECTION | NODE | ZONE | LAST_NID ... | FLAGS | |
45 | * classic sparse no space for node: | SECTION | ZONE | ... | FLAGS | |
46 | */ |
47 | #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP) |
48 | #define SECTIONS_WIDTH SECTIONS_SHIFT |
49 | #else |
50 | #define SECTIONS_WIDTH 0 |
51 | #endif |
52 | |
53 | #define ZONES_WIDTH ZONES_SHIFT |
54 | |
55 | #if SECTIONS_WIDTH+ZONES_WIDTH+NODES_SHIFT <= BITS_PER_LONG - NR_PAGEFLAGS |
56 | #define NODES_WIDTH NODES_SHIFT |
57 | #else |
58 | #ifdef CONFIG_SPARSEMEM_VMEMMAP |
59 | #error "Vmemmap: No space for nodes field in page flags" |
60 | #endif |
61 | #define NODES_WIDTH 0 |
62 | #endif |
63 | |
64 | #ifdef CONFIG_NUMA_BALANCING |
65 | #define LAST_NID_SHIFT NODES_SHIFT |
66 | #else |
67 | #define LAST_NID_SHIFT 0 |
68 | #endif |
69 | |
70 | #if SECTIONS_WIDTH+ZONES_WIDTH+NODES_SHIFT+LAST_NID_SHIFT <= BITS_PER_LONG - NR_PAGEFLAGS |
71 | #define LAST_NID_WIDTH LAST_NID_SHIFT |
72 | #else |
73 | #define LAST_NID_WIDTH 0 |
74 | #endif |
75 | |
76 | /* |
77 | * We are going to use the flags for the page to node mapping if its in |
78 | * there. This includes the case where there is no node, so it is implicit. |
79 | */ |
80 | #if !(NODES_WIDTH > 0 || NODES_SHIFT == 0) |
81 | #define NODE_NOT_IN_PAGE_FLAGS |
82 | #endif |
83 | |
84 | #if defined(CONFIG_NUMA_BALANCING) && LAST_NID_WIDTH == 0 |
85 | #define LAST_NID_NOT_IN_PAGE_FLAGS |
86 | #endif |
87 | |
88 | #endif /* _LINUX_PAGE_FLAGS_LAYOUT */ |
89 |
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