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remote: Make ref_remove_duplicates faster for large numbers of refs 

The ref_remove_duplicates function was very slow at dealing with very
large numbers of refs.  This is because it was using a linear search
through all remaining refs to find any duplicates of the current ref.

Rewriting it to use a string list to keep track of which refs have
already been seen and removing duplicates when they are found is much
more efficient.

Signed-off-by: Julian Phillips <julian@quantumfyre.co.uk>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Julian Phillips 2009-10-25 21:28:11 +00:00 committed by Junio C Hamano
parent e984c54ada
commit 73cf0822b2
1 changed files with 22 additions and 19 deletions
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41
remote.c
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@ -6,6 +6,7 @@
#include "revision.h"
#include "dir.h"
#include "tag.h"
#include "string-list.h"
static struct refspec s_tag_refspec = {
0,
@ -734,29 +735,31 @@ int for_each_remote(each_remote_fn fn, void *priv)
void ref_remove_duplicates(struct ref *ref_map)
{
struct ref **posn;
struct ref *next;
for (; ref_map; ref_map = ref_map->next) {
struct string_list refs = { NULL, 0, 0, 0 };
struct string_list_item *item = NULL;
struct ref *prev = NULL, *next = NULL;
for (; ref_map; prev = ref_map, ref_map = next) {
next = ref_map->next;
if (!ref_map->peer_ref)
continue;
posn = &ref_map->next;
while (*posn) {
if ((*posn)->peer_ref &&
!strcmp((*posn)->peer_ref->name,
ref_map->peer_ref->name)) {
if (strcmp((*posn)->name, ref_map->name))
die("%s tracks both %s and %s",
ref_map->peer_ref->name,
(*posn)->name, ref_map->name);
next = (*posn)->next;
free((*posn)->peer_ref);
free(*posn);
*posn = next;
} else {
posn = &(*posn)->next;
}
item = string_list_lookup(ref_map->peer_ref->name, &refs);
if (item) {
if (strcmp(((struct ref *)item->util)->name,
ref_map->name))
die("%s tracks both %s and %s",
ref_map->peer_ref->name,
((struct ref *)item->util)->name,
ref_map->name);
prev->next = ref_map->next;
free(ref_map->peer_ref);
free(ref_map);
}
item = string_list_insert(ref_map->peer_ref->name, &refs);
item->util = ref_map;
}
string_list_clear(&refs, 0);
}
int remote_has_url(struct remote *remote, const char *url)