@@ -351,6 +351,8 @@ static QemuMutex *comp_done_lock;
static QemuCond *comp_done_cond;
/* The empty QEMUFileOps will be used by file in CompressParam */
static const QEMUFileOps empty_ops = { };
+static bool compression_switch;
+
static DecompressParam *decomp_param;
static QemuThread *decompress_threads;
static uint8_t *compressed_data_buf;
@@ -436,6 +438,7 @@ void migrate_compress_threads_create(void)
if (!migrate_use_compression()) {
return;
}
+ compression_switch = true;
thread_count = migrate_compress_threads();
compress_threads = g_new0(QemuThread, thread_count);
comp_param = g_new0(CompressParam, thread_count);
@@ -1059,9 +1062,16 @@ static int ram_find_and_save_block(QEMUFile *f, bool last_stage,
block = QLIST_FIRST_RCU(&ram_list.blocks);
complete_round = true;
ram_bulk_stage = false;
+ if (migrate_use_xbzrle()) {
+ /* If xbzrle is on, stop using the data compression at this
+ * point. In theory, xbzrle can do better than compression.
+ */
+ flush_compressed_data(f);
+ compression_switch = false;
+ }
}
} else {
- if (migrate_use_compression()) {
+ if (compression_switch && migrate_use_compression()) {
pages = ram_save_compressed_page(f, block, offset, last_stage,
bytes_transferred);
} else {