On 02/11/2015 08:16 PM, zhanghailiang wrote:
We can know if we should go into COLO mode by the info that
has been migrated from PVM.
Signed-off-by: zhanghailiang <address@hidden>
Signed-off-by: Yang Hongyang <address@hidden>
Signed-off-by: Lai Jiangshan <address@hidden>
Signed-off-by: Gonglei <address@hidden>
---
include/migration/migration-colo.h | 21 ++++++++++++++
migration/Makefile.objs | 1 +
migration/colo-comm.c | 56 ++++++++++++++++++++++++++++++++++++++
vl.c | 5 +++-
4 files changed, 82 insertions(+), 1 deletion(-)
create mode 100644 include/migration/migration-colo.h
create mode 100644 migration/colo-comm.c
+
+/* #define DEBUG_COLO */
+
+#ifdef DEBUG_COLO
+#define DPRINTF(fmt, ...) \
+ do { fprintf(stdout, "COLO: " fmt, ## __VA_ARGS__); } while (0)
+#else
+#define DPRINTF(fmt, ...) \
+ do { } while (0)
+#endif
This is not very good (that is, it is a great way to write stale
debugging statements that tend to bit-rot, and later fail to compile
when you turn debug on). Better is a usage pattern that enforces that
the debug compiles but has no impact. For example, see how block/ssh.c
defines DPRINTF.