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Add migrate_set_cache_size command

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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>
This commit is contained in:
Orit Wasserman 2012-08-06 21:42:54 +03:00 • committed by Juan Quintela
parent 17ad9b358b
commit 9e1ba4cc4e
9 changed files with 152 additions and 0 deletions
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22
hmp-commands.hx
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@ -829,6 +829,26 @@ STEXI
@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 user network stack connection states
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