77 lines
1.7 KiB
C
77 lines
1.7 KiB
C
/*
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* alloc.c - specialized allocator for internal objects
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*
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* Copyright (C) 2006 Linus Torvalds
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*
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* The standard malloc/free wastes too much space for objects, partly because
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* it maintains all the allocation infrastructure (which isn't needed, since
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* we never free an object descriptor anyway), but even more because it ends
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* up with maximal alignment because it doesn't know what the object alignment
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* for the new allocation is.
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*/
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#include "cache.h"
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#include "object.h"
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#include "blob.h"
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#include "tree.h"
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#include "commit.h"
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#include "tag.h"
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#define BLOCKING 1024
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#define DEFINE_ALLOCATOR(name, type) \
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static unsigned int name##_allocs; \
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void *alloc_##name##_node(void) \
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{ \
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static int nr; \
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static type *block; \
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void *ret; \
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\
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if (!nr) { \
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nr = BLOCKING; \
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block = xmalloc(BLOCKING * sizeof(type)); \
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} \
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nr--; \
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name##_allocs++; \
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ret = block++; \
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memset(ret, 0, sizeof(type)); \
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return ret; \
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}
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union any_object {
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struct object object;
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struct blob blob;
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struct tree tree;
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struct commit commit;
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struct tag tag;
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};
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DEFINE_ALLOCATOR(blob, struct blob)
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DEFINE_ALLOCATOR(tree, struct tree)
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DEFINE_ALLOCATOR(commit, struct commit)
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DEFINE_ALLOCATOR(tag, struct tag)
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DEFINE_ALLOCATOR(object, union any_object)
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#ifdef NO_C99_FORMAT
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#define SZ_FMT "%u"
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#else
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#define SZ_FMT "%zu"
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#endif
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static void report(const char *name, unsigned int count, size_t size)
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{
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fprintf(stderr, "%10s: %8u (" SZ_FMT " kB)\n", name, count, size);
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}
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#undef SZ_FMT
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#define REPORT(name) \
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report(#name, name##_allocs, name##_allocs*sizeof(struct name) >> 10)
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void alloc_report(void)
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{
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REPORT(blob);
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REPORT(tree);
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REPORT(commit);
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REPORT(tag);
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}
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