virtual optimization: If saved highest-modseq matches current one, don't try to find...

--HG--
branch : HEAD

diff --git a/src/plugins/virtual/virtual-sync.c b/src/plugins/virtual/virtual-sync.c
index a1a9dd86100c88778f79ff78e80c072c6336d71c..98efe0a206fb7f98bff7df30f8530bc99aad79b1 100644 (file)
--- a/src/plugins/virtual/virtual-sync.c
+++ b/src/plugins/virtual/virtual-sync.c
@@ -689,7 +689,7 @@ static int virtual_sync_backend_box_continue(struct virtual_sync_context *ctx,
        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_continue(struct virtual_sync_context *ctx,
            !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);
+                       }
                }
        }