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Rework object refs tracking to reduce memory usage

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Store pointers to referenced objects in a variable sized array instead
of linked list.  This cuts down memory usage of utilities which use
object references; e.g., git-fsck-objects --full on the git.git
repository consumes about 2 MB of memory tracked by Massif instead of
7 MB before the change.  Object refs are still the biggest consumer of
memory (57%), but the malloc overhead for a single block instead of a
linked list is substantially smaller.

Signed-off-by: Sergey Vlasov <vsu@altlinux.ru>
Signed-off-by: Junio C Hamano <junkio@cox.net>
This commit is contained in:
Sergey Vlasov
2005-11-15 19:08:08 +03:00
committed by Junio C Hamano
parent 545f229a4b
commit 4a4e6fd74f
7 changed files with 117 additions and 43 deletions
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10
object.h
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@ -7,13 +7,18 @@ struct object_list {
const char *name;
};
struct object_refs {
unsigned count;
struct object *ref[0];
};
struct object {
unsigned parsed : 1;
unsigned used : 1;
unsigned int flags;
unsigned char sha1[20];
const char *type;
struct object_list *refs;
struct object_refs *refs;
void *util;
};
@ -35,7 +40,8 @@ struct object *parse_object(const unsigned char *sha1);
/** Returns the object, with potentially excess memory allocated. **/
struct object *lookup_unknown_object(const unsigned char *sha1);
void add_ref(struct object *refer, struct object *target);
struct object_refs *alloc_object_refs(unsigned count);
void set_object_refs(struct object *obj, struct object_refs *refs);
void mark_reachable(struct object *obj, unsigned int mask);