From: Junio Hamano <gitster@xxxxxxxxx>
Date: Mon, 30 Mar 2009 21:34:14 -0700
Instead of doing the (potentially very expensive) "in_merge_base()"
check for each commit that might be pruned if it is unreachable, do a
preparatory reachability graph of the commit space, so that the common
case of being reachable can be tested directly.
[ Cleaned up a bit and tweaked to actually work. - Linus ]
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
---
builtin-reflog.c | 43 +++++++++++++++++++++++++++++++++++++++++++
1 files changed, 43 insertions(+), 0 deletions(-)
diff --git a/builtin-reflog.c b/builtin-reflog.c
index 0355ce6..f29ab2f 100644
--- a/builtin-reflog.c
+++ b/builtin-reflog.c
@@ -52,6 +52,7 @@ struct collect_reflog_cb {
#define INCOMPLETE (1u<<10)
#define STUDYING (1u<<11)
+#define REACHABLE (1u<<12)
static int tree_is_complete(const unsigned char *sha1)
{
@@ -209,6 +210,43 @@ static int keep_entry(struct commit **it, unsigned char *sha1)
return 1;
}
+static void mark_reachable(struct commit *commit, unsigned long expire_limit)
+{
+ /*
+ * We need to compute if commit on either side of an reflog
+ * entry is reachable from the tip of the ref for all entries.
+ * Mark commits that are reachable from the tip down to the
+ * time threashold first; we know a commit marked thusly is
+ * reachable from the tip without running in_merge_bases()
+ * at all.
+ */
+ struct commit_list *pending = NULL;
+
+ commit_list_insert(commit, &pending);
+ while (pending) {
+ struct commit_list *entry = pending;
+ struct commit_list *parent;
+ pending = entry->next;
+ commit = entry->item;
+ free(entry);
+ if (commit->object.flags & REACHABLE)
+ continue;
+ if (parse_commit(commit))
+ continue;
+ commit->object.flags |= REACHABLE;
+ if (commit->date < expire_limit)
+ continue;
+ parent = commit->parents;
+ while (parent) {
+ commit = parent->item;
+ parent = parent->next;
+ if (commit->object.flags & REACHABLE)
+ continue;
+ commit_list_insert(commit, &pending);
+ }
+ }
+}
+
static int unreachable(struct expire_reflog_cb *cb, struct commit *commit, unsigned char *sha1)
{
/*
@@ -227,6 +265,8 @@ static int unreachable(struct expire_reflog_cb *cb, struct commit *commit, unsig
}
/* Reachable from the current reflog top? Don't prune */
+ if (commit->object.flags & REACHABLE)
+ return 0;
if (in_merge_bases(commit, &cb->ref_commit, 1))
return 0;
@@ -308,7 +348,10 @@ static int expire_reflog(const char *ref, const unsigned char *sha1, int unused,
cb.ref_commit = lookup_commit_reference_gently(sha1, 1);
cb.ref = ref;
cb.cmd = cmd;
+
+ mark_reachable(cb.ref_commit, cmd->expire_total);
for_each_reflog_ent(ref, expire_reflog_ent, &cb);
+ clear_commit_marks(cb.ref_commit, REACHABLE);
finish:
if (cb.newlog) {
if (fclose(cb.newlog)) {
--
1.6.2.1.404.gb0085.dirty
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