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[alt-git.git] / alloc.c
blobaeae55c976802264d714282218e58a858a9c68b5
1 /*
2 * alloc.c - specialized allocator for internal objects
4 * Copyright (C) 2006 Linus Torvalds
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.
12 #include "cache.h"
13 #include "object.h"
14 #include "blob.h"
15 #include "tree.h"
16 #include "commit.h"
17 #include "tag.h"
19 #define BLOCKING 1024
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; \
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; \
40 union any_object {
41 struct object object;
42 struct blob blob;
43 struct tree tree;
44 struct commit commit;
45 struct tag tag;
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)
54 static void report(const char *name, unsigned int count, size_t size)
56 fprintf(stderr, "%10s: %8u (%"PRIuMAX" kB)\n",
57 name, count, (uintmax_t) size);
60 #define REPORT(name) \
61 report(#name, name##_allocs, name##_allocs*sizeof(struct name) >> 10)
63 void alloc_report(void)
65 REPORT(blob);
66 REPORT(tree);
67 REPORT(commit);
68 REPORT(tag);