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855419f7 LT |
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) \ | |
22 | static unsigned int name##_allocs; \ | |
23 | struct name *alloc_##name##_node(void) \ | |
24 | { \ | |
25 | static int nr; \ | |
26 | static struct name *block; \ | |
27 | \ | |
28 | if (!nr) { \ | |
29 | nr = BLOCKING; \ | |
30 | block = xcalloc(BLOCKING, sizeof(struct name)); \ | |
31 | } \ | |
32 | nr--; \ | |
33 | name##_allocs++; \ | |
34 | return block++; \ | |
35 | } | |
36 | ||
37 | DEFINE_ALLOCATOR(blob) | |
38 | DEFINE_ALLOCATOR(tree) | |
39 | DEFINE_ALLOCATOR(commit) | |
40 | DEFINE_ALLOCATOR(tag) | |
41 | ||
579d1fbf RJ |
42 | #ifdef NO_C99_FORMAT |
43 | #define SZ_FMT "%u" | |
44 | #else | |
45 | #define SZ_FMT "%zu" | |
46 | #endif | |
47 | ||
48 | static void report(const char* name, unsigned int count, size_t size) | |
49 | { | |
50 | fprintf(stderr, "%10s: %8u (" SZ_FMT " kB)\n", name, count, size); | |
51 | } | |
52 | ||
53 | #undef SZ_FMT | |
54 | ||
855419f7 | 55 | #define REPORT(name) \ |
579d1fbf | 56 | report(#name, name##_allocs, name##_allocs*sizeof(struct name) >> 10) |
855419f7 LT |
57 | |
58 | void alloc_report(void) | |
59 | { | |
60 | REPORT(blob); | |
61 | REPORT(tree); | |
62 | REPORT(commit); | |
63 | REPORT(tag); | |
64 | } |