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@xxxxxxxxxxxxxxxxx>
---
remote.c | 39 +++++++++++++++++++++------------------
1 files changed, 21 insertions(+), 18 deletions(-)
diff --git a/remote.c b/remote.c
index 73d33f2..a97c2c3 100644
--- a/remote.c
+++ b/remote.c
@@ -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;
+ struct string_list refs = { NULL, 0, 0, 0 };
+ struct string_list_item *item = NULL;
+ struct ref *prev = NULL;
for (; ref_map; ref_map = 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;
+ prev = ref_map;
}
+ string_list_clear(&refs, 0);
}
int remote_has_url(struct remote *remote, const char *url)
--
1.6.5.rc2
--
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