Add migrate_set_cache_size command

Change XBZRLE cache size in bytes (the size should be a power of 2, it will be
rounded down to the nearest power of 2).
If XBZRLE cache size is too small there will be many cache miss.

New query-migrate-cache-size QMP command and 'info migrate_cache_size' HMP
command to query cache value.

Signed-off-by: Benoit Hudzia <benoit.hudzia@sap.com>
Signed-off-by: Petter Svard <petters@cs.umu.se>
Signed-off-by: Aidan Shribman <aidan.shribman@sap.com>
Signed-off-by: Orit Wasserman <owasserm@redhat.com>

Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/monitor.c b/monitor.c
index 13b681ab48..5227cf15e3 100644
--- a/monitor.c
+++ b/monitor.c
@@ -2662,6 +2662,13 @@ static mon_cmd_t info_cmds[] = {
         .mhandler.info = hmp_info_migrate_capabilities,
     },
     {
+        .name       = "migrate_cache_size",
+        .args_type  = "",
+        .params     = "",
+        .help       = "show current migration xbzrle cache size",
+        .mhandler.info = hmp_info_migrate_cache_size,
+    },
+    {
         .name       = "balloon",
         .args_type  = "",
         .params     = "",