]>
Commit | Line | Data |
---|---|---|
1 | /* | |
2 | * alloc.c - specialized allocator for internal objects | |
3 | * | |
4 | * Copyright (C) 2006 Linus Torvalds | |
5 | * | |
6 | * The standard malloc/free wastes too much space for objects, partly because | |
7 | * it maintains all the allocation infrastructure (which isn't needed, since | |
8 | * we never free an object descriptor anyway), but even more because it ends | |
9 | * up with maximal alignment because it doesn't know what the object alignment | |
10 | * for the new allocation is. | |
11 | */ | |
12 | #include "cache.h" | |
13 | #include "object.h" | |
14 | #include "blob.h" | |
15 | #include "tree.h" | |
16 | #include "commit.h" | |
17 | #include "tag.h" | |
18 | ||
19 | #define BLOCKING 1024 | |
20 | ||
21 | #define DEFINE_ALLOCATOR(name, type) \ | |
22 | static unsigned int name##_allocs; \ | |
23 | void *alloc_##name##_node(void) \ | |
24 | { \ | |
25 | static int nr; \ | |
26 | static type *block; \ | |
27 | void *ret; \ | |
28 | \ | |
29 | if (!nr) { \ | |
30 | nr = BLOCKING; \ | |
31 | block = xmalloc(BLOCKING * sizeof(type)); \ | |
32 | } \ | |
33 | nr--; \ | |
34 | name##_allocs++; \ | |
35 | ret = block++; \ | |
36 | memset(ret, 0, sizeof(type)); \ | |
37 | return ret; \ | |
38 | } | |
39 | ||
40 | union any_object { | |
41 | struct object object; | |
42 | struct blob blob; | |
43 | struct tree tree; | |
44 | struct commit commit; | |
45 | struct tag tag; | |
46 | }; | |
47 | ||
48 | DEFINE_ALLOCATOR(blob, struct blob) | |
49 | DEFINE_ALLOCATOR(tree, struct tree) | |
50 | DEFINE_ALLOCATOR(commit, struct commit) | |
51 | DEFINE_ALLOCATOR(tag, struct tag) | |
52 | DEFINE_ALLOCATOR(object, union any_object) | |
53 | ||
54 | #ifdef NO_C99_FORMAT | |
55 | #define SZ_FMT "%u" | |
56 | #else | |
57 | #define SZ_FMT "%zu" | |
58 | #endif | |
59 | ||
60 | static void report(const char* name, unsigned int count, size_t size) | |
61 | { | |
62 | fprintf(stderr, "%10s: %8u (" SZ_FMT " kB)\n", name, count, size); | |
63 | } | |
64 | ||
65 | #undef SZ_FMT | |
66 | ||
67 | #define REPORT(name) \ | |
68 | report(#name, name##_allocs, name##_allocs*sizeof(struct name) >> 10) | |
69 | ||
70 | void alloc_report(void) | |
71 | { | |
72 | REPORT(blob); | |
73 | REPORT(tree); | |
74 | REPORT(commit); | |
75 | REPORT(tag); | |
76 | } |