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 <[email protected]>
Signed-off-by: Petter Svard <[email protected]>
Signed-off-by: Aidan Shribman <[email protected]>
Signed-off-by: Orit Wasserman <[email protected]>
Reviewed-by: Luiz Capitulino <[email protected]>
Reviewed-by: Eric Blake <[email protected]>
diff --git a/hmp-commands.hx b/hmp-commands.hx
index 476b3cd..f6104b0 100644
--- a/hmp-commands.hx
+++ b/hmp-commands.hx
@@ -829,6 +829,26 @@
@item migrate_cancel
@findex migrate_cancel
Cancel the current VM migration.
+
+ETEXI
+
+ {
+ .name = "migrate_set_cache_size",
+ .args_type = "value:o",
+ .params = "value",
+ .help = "set cache size (in bytes) for XBZRLE migrations,"
+ "the cache size will be rounded down to the nearest "
+ "power of 2.\n"
+ "The cache size affects the number of cache misses."
+ "In case of a high cache miss ratio you need to increase"
+ " the cache size",
+ .mhandler.cmd = hmp_migrate_set_cache_size,
+ },
+
+STEXI
+@item migrate_set_cache_size @var{value}
+@findex migrate_set_cache_size
+Set cache size to @var{value} (in bytes) for xbzrle migrations.
ETEXI
{
@@ -1433,6 +1453,8 @@
show migration status
@item info migrate_capabilities
show current migration capabilities
+@item info migrate_cache_size
+show current migration XBZRLE cache size
@item info balloon
show balloon information
@item info qtree
