From 2ea42952ee131b90c5286203d5d38deb66d32aec Mon Sep 17 00:00:00 2001 From: Glauber Costa Date: Thu, 28 May 2009 15:22:58 -0400 Subject: [PATCH] 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 Signed-off-by: Anthony Liguori --- migration.c | 19 +++++++++++++++++++ migration.h | 2 ++ qemu-monitor.hx | 8 ++++++++ 3 files changed, 29 insertions(+) diff --git a/migration.c b/migration.c index 748752e82a..190b37e550 100644 --- a/migration.c +++ b/migration.c @@ -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; diff --git a/migration.h b/migration.h index 0596f24636..37c7f8e158 100644 --- a/migration.h +++ b/migration.h @@ -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); diff --git a/qemu-monitor.hx b/qemu-monitor.hx index f1155b8184..fa4852728b 100644 --- a/qemu-monitor.hx +++ b/qemu-monitor.hx @@ -484,6 +484,14 @@ STEXI 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) { "drive_add", "ss", drive_hot_add, "pci_addr=[[:]:]\n" "[file=file][,if=type][,bus=n]\n" -- 2.11.4.GIT