dovecot-2.0: virtual optimization: If saved highest-modseq match...

[dovecot at dovecot.org]

details:   http://hg.dovecot.org/dovecot-2.0/rev/b7ce62749fd7
changeset: 10443:b7ce62749fd7
user:      Timo Sirainen <tss at iki.fi>
date:      Wed Dec 09 18:58:13 2009 -0500
description:
virtual optimization: If saved highest-modseq matches current one, don't try to find higher ones.

diffstat:

1 file changed, 10 insertions(+), 6 deletions(-)
src/plugins/virtual/virtual-sync.c |   16 ++++++++++------

diffs (34 lines):

diff -r aa97e059ca32 -r b7ce62749fd7 src/plugins/virtual/virtual-sync.c
--- a/src/plugins/virtual/virtual-sync.c	Wed Dec 09 18:47:27 2009 -0500
+++ b/src/plugins/virtual/virtual-sync.c	Wed Dec 09 18:58:13 2009 -0500
@@ -689,7 +689,7 @@ static int virtual_sync_backend_box_cont
 	struct index_mailbox *ibox = (struct index_mailbox *)bbox->box;
 	struct mail_search_result *result;
 	ARRAY_TYPE(seq_range) removed_uids, added_uids, flag_update_uids;
-	uint64_t modseq;
+	uint64_t modseq, old_highest_modseq;
 	uint32_t seq, uid, old_msg_count;
 
 	/* initialize the search result from all the existing messages in
@@ -706,12 +706,16 @@ static int virtual_sync_backend_box_cont
 	    !mail_index_lookup_seq_range(ibox->view, 1, bbox->sync_next_uid-1,
 					 &seq, &old_msg_count))
 		old_msg_count = 0;
+	old_highest_modseq = mail_index_modseq_get_highest(ibox->view);
+
 	t_array_init(&flag_update_uids, I_MIN(128, old_msg_count));
-	for (seq = 1; seq <= old_msg_count; seq++) {
-		modseq = mail_index_modseq_lookup(ibox->view, seq);
-		if (modseq > bbox->sync_highest_modseq) {
-			mail_index_lookup_uid(ibox->view, seq, &uid);
-			seq_range_array_add(&flag_update_uids, 0, uid);
+	if (bbox->sync_highest_modseq < old_highest_modseq) {
+		for (seq = 1; seq <= old_msg_count; seq++) {
+			modseq = mail_index_modseq_lookup(ibox->view, seq);
+			if (modseq > bbox->sync_highest_modseq) {
+				mail_index_lookup_uid(ibox->view, seq, &uid);
+				seq_range_array_add(&flag_update_uids, 0, uid);
+			}
 		}
 	}