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set migration max downtime 

provide a monitor command to allow one to set the maximum
downtime he is willing to suffer during migration, in seconds.
"ms", "us", "ns" and "s" are accepted as modifiers.

This parameter will be used by ram_save_live() code to determine
a safe moment to enter stage 3

Signed-off-by: Glauber Costa <glommer@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Glauber Costa 2009-05-28 15:22:58 -04:00 committed by Anthony Liguori
parent a0a3fd60f6
commit 2ea42952ee
3 changed files with 29 additions and 0 deletions
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19
migration.c
View File

@ -118,6 +118,25 @@ uint64_t migrate_max_downtime(void)
return max_downtime;
}
void do_migrate_set_downtime(Monitor *mon, const char *value)
{
char *ptr;
double d;
d = strtod(value, &ptr);
if (!strcmp(ptr,"ms")) {
d *= 1000000;
} else if (!strcmp(ptr,"us")) {
d *= 1000;
} else if (!strcmp(ptr,"ns")) {
} else {
/* all else considered to be seconds */
d *= 1000000000;
}
max_downtime = (uint64_t)d;
}
void do_info_migrate(Monitor *mon)
{
MigrationState *s = current_migration;

2
migration.h
View File

@ -57,6 +57,8 @@ void do_migrate_set_speed(Monitor *mon, const char *value);
uint64_t migrate_max_downtime(void);
void do_migrate_set_downtime(Monitor *mon, const char *value);
void do_info_migrate(Monitor *mon);
int exec_start_incoming_migration(const char *host_port);

8
qemu-monitor.hx
View File

@ -482,6 +482,14 @@ ETEXI
STEXI
@item migrate_set_speed @var{value}
Set maximum speed to @var{value} (in bytes) for migrations.
ETEXI
{ "migrate_set_downtime", "s", do_migrate_set_downtime,
"value", "set maximum tolerated downtime (in seconds) for migrations" },
STEXI
@item migrate_set_downtime @var{second}
Set maximum tolerated downtime (in seconds) for migration.
ETEXI
#if defined(TARGET_I386)