Now, multiple thread compression can co-work with xbzrle. when
xbzrle is on, multiple thread compression will only work at the
first round of RAM data sync.
Signed-off-by: Liang Li <liang.z...@intel.com>
Signed-off-by: Yang Zhang <yang.z.zh...@intel.com>
---
arch_init.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/arch_init.c b/arch_init.c
index b8bdb16..8ef0315 100644
--- a/arch_init.c
+++ b/arch_init.c
@@ -364,6 +364,7 @@ static QemuCond *comp_done_cond;
/* The empty QEMUFileOps will be used by file in CompressParam */
static const QEMUFileOps empty_ops = { };
static bool quit_thread;
+static bool compression_switch_on;
static int one_byte_count;
static DecompressParam *decomp_param;
static QemuThread *decompress_threads;
@@ -440,6 +441,7 @@ void migrate_compress_threads_create(MigrationState *s)
return;
}
quit_thread = false;
+ compression_switch_on = true;
thread_count = migrate_compress_threads();
s->compress_thread = g_new0(QemuThread, thread_count);
comp_param = g_new0(CompressParam, thread_count);
@@ -957,9 +959,16 @@ static int ram_find_and_save_block(QEMUFile *f, bool
last_stage)
block = QTAILQ_FIRST(&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_on = false;
+ }
}
} else {
- if (migrate_use_compression()) {
+ if (compression_switch_on && migrate_use_compression()) {
bytes_sent = ram_save_compressed_page(f, block, offset,
last_stage);
} else {
--
1.9.1
