gwj / at91sam9263 · Commits

Commit 2ea42952ee131b90c5286203d5d38deb66d32aec

Authored by Glauber Costa
Committed by Anthony Liguori
1 parent a0a3fd60

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>
Inline Side-by-side
Showing 3 changed files with 29 additions and 0 deletions
migration.c
  View file @2ea4295
... ... @@ -118,6 +118,25 @@ uint64_t migrate_max_downtime(void)
118 118 return max_downtime;
119 119 }
120 120  
  121 +void do_migrate_set_downtime(Monitor *mon, const char *value)
  122 +{
  123 + char *ptr;
  124 + double d;
  125 +
  126 + d = strtod(value, &ptr);
  127 + if (!strcmp(ptr,"ms")) {
  128 + d *= 1000000;
  129 + } else if (!strcmp(ptr,"us")) {
  130 + d *= 1000;
  131 + } else if (!strcmp(ptr,"ns")) {
  132 + } else {
  133 + /* all else considered to be seconds */
  134 + d *= 1000000000;
  135 + }
  136 +
  137 + max_downtime = (uint64_t)d;
  138 +}
  139 +
121 140 void do_info_migrate(Monitor *mon)
122 141 {
123 142 MigrationState *s = current_migration;
... ...
migration.h
  View file @2ea4295
... ... @@ -57,6 +57,8 @@ void do_migrate_set_speed(Monitor *mon, const char *value);
57 57  
58 58 uint64_t migrate_max_downtime(void);
59 59  
  60 +void do_migrate_set_downtime(Monitor *mon, const char *value);
  61 +
60 62 void do_info_migrate(Monitor *mon);
61 63  
62 64 int exec_start_incoming_migration(const char *host_port);
... ...
qemu-monitor.hx
  View file @2ea4295
... ... @@ -484,6 +484,14 @@ STEXI
484 484 Set maximum speed to @var{value} (in bytes) for migrations.
485 485 ETEXI
486 486  
  487 + { "migrate_set_downtime", "s", do_migrate_set_downtime,
  488 + "value", "set maximum tolerated downtime (in seconds) for migrations" },
  489 +
  490 +STEXI
  491 +@item migrate_set_downtime @var{second}
  492 +Set maximum tolerated downtime (in seconds) for migration.
  493 +ETEXI
  494 +
487 495 #if defined(TARGET_I386)
488 496 { "drive_add", "ss", drive_hot_add, "pci_addr=[[<domain>:]<bus>:]<slot>\n"
489 497 "[file=file][,if=type][,bus=n]\n"
... ...