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migration: Add direct-io parameter

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Add the direct-io migration parameter that tells the migration code to
use O_DIRECT when opening the migration stream file whenever possible.

This is currently only used with the mapped-ram migration that has a
clear window guaranteed to perform aligned writes.

Acked-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Fabiano Rosas <farosas@suse.de>
This commit is contained in:
Fabiano Rosas 2024-06-17 15:57:26 -03:00
parent 46cec74c1b
commit b43b61d5be
6 changed files with 76 additions and 3 deletions
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11
migration/migration-hmp-cmds.c
View file

@ -351,6 +351,13 @@ void hmp_info_migrate_parameters(Monitor *mon, const QDict *qdict)
monitor_printf(mon, "%s: %s\n",
MigrationParameter_str(MIGRATION_PARAMETER_MODE),
qapi_enum_lookup(&MigMode_lookup, params->mode));
if (params->has_direct_io) {
monitor_printf(mon, "%s: %s\n",
MigrationParameter_str(
MIGRATION_PARAMETER_DIRECT_IO),
params->direct_io ? "on" : "off");
}
}
qapi_free_MigrationParameters(params);
@ -624,6 +631,10 @@ void hmp_migrate_set_parameter(Monitor *mon, const QDict *qdict)
p->has_mode = true;
visit_type_MigMode(v, param, &p->mode, &err);
break;
case MIGRATION_PARAMETER_DIRECT_IO:
p->has_direct_io = true;
visit_type_bool(v, param, &p->direct_io, &err);
break;
default:
assert(0);
}