Merge branch 'jk/fetch-pack-many-refs'

Fetching between repositories with many refs employed O(n^2)
algorithm to match up the common objects, which has been corrected.

* jk/fetch-pack-many-refs:
fetch-pack: avoid quadratic behavior in rev_list_push
commit.c: make compare_commits_by_commit_date global
fetch-pack: avoid quadratic list insertion in mark_complete

diff --git a/commit.c b/commit.c
index 521e49c3094acc06340e15f7be27722be9b03ee8..ebc0eeab8f9c1678f3780991a9414f2261215427 100644 (file)
--- a/commit.c
+++ b/commit.c
@@ -581,7 +581,7 @@ static int compare_commits_by_author_date(const void *a_, const void *b_,
        return 0;
 }
 
-static int compare_commits_by_commit_date(const void *a_, const void *b_, void *unused)
+int compare_commits_by_commit_date(const void *a_, const void *b_, void *unused)
 {
        const struct commit *a = a_, *b = b_;
        /* newer commits with larger date first */

diff --git a/commit.h b/commit.h
index 4d452dc96db3d5590878ab6f257022fe76b4130b..18a523495eb7be3636f4f1311375fdb35329da9e 100644 (file)
--- a/commit.h
+++ b/commit.h
@@ -254,4 +254,6 @@ extern void print_commit_list(struct commit_list *list,
  */
 extern void check_commit_signature(const struct commit* commit, struct signature_check *sigc);
 
+int compare_commits_by_commit_date(const void *a_, const void *b_, void *unused);
+
 #endif /* COMMIT_H */

diff --git a/fetch-pack.c b/fetch-pack.c
index abe5ffbba55037c34b1bf38a86aa0ec8bd7f3447..6684348c0ec9ea742eb98666b56a0bfcef316560 100644 (file)
--- a/fetch-pack.c
+++ b/fetch-pack.c
@@ -11,6 +11,7 @@
 #include "run-command.h"
 #include "transport.h"
 #include "version.h"
+#include "prio-queue.h"
 
 static int transfer_unpack_limit = -1;
 static int fetch_unpack_limit = -1;
@@ -37,7 +38,7 @@ static int marked;
  */
 #define MAX_IN_VAIN 256
 
-static struct commit_list *rev_list;
+static struct prio_queue rev_list = { compare_commits_by_commit_date };
 static int non_common_revs, multi_ack, use_sideband, allow_tip_sha1_in_want;
 
 static void rev_list_push(struct commit *commit, int mark)
@@ -49,7 +50,7 @@ static void rev_list_push(struct commit *commit, int mark)
                        if (parse_commit(commit))
                                return;
 
-               commit_list_insert_by_date(commit, &rev_list);
+               prio_queue_put(&rev_list, commit);
 
                if (!(commit->object.flags & COMMON))
                        non_common_revs++;
@@ -122,10 +123,10 @@ static const unsigned char *get_rev(void)
                unsigned int mark;
                struct commit_list *parents;
 
-               if (rev_list == NULL || non_common_revs == 0)
+               if (rev_list.nr == 0 || non_common_revs == 0)
                        return NULL;
 
-               commit = rev_list->item;
+               commit = prio_queue_get(&rev_list);
                if (!commit->object.parsed)
                        parse_commit(commit);
                parents = commit->parents;
@@ -152,8 +153,6 @@ static const unsigned char *get_rev(void)
                                mark_common(parents->item, 1, 0);
                        parents = parents->next;
                }
-
-               rev_list = rev_list->next;
        }
 
        return commit->object.sha1;
@@ -442,7 +441,7 @@ static int find_common(struct fetch_pack_args *args,
                                        in_vain = 0;
                                        got_continue = 1;
                                        if (ack == ACK_ready) {
-                                               rev_list = NULL;
+                                               clear_prio_queue(&rev_list);
                                                got_ready = 1;
                                        }
                                        break;
@@ -505,7 +504,7 @@ static int mark_complete(const char *refname, const unsigned char *sha1, int fla
                struct commit *commit = (struct commit *)o;
                if (!(commit->object.flags & COMPLETE)) {
                        commit->object.flags |= COMPLETE;
-                       commit_list_insert_by_date(commit, &complete);
+                       commit_list_insert(commit, &complete);
                }
        }
        return 0;
@@ -622,6 +621,7 @@ static int everything_local(struct fetch_pack_args *args,
        if (!args->depth) {
                for_each_ref(mark_complete, NULL);
                for_each_alternate_ref(mark_alternate_complete, NULL);
+               commit_list_sort_by_date(&complete);
                if (cutoff)
                        mark_recent_complete_commits(args, cutoff);
        }