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migration: introduce postcopy-blocktime capability

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Right now it could be used on destination side to
enable vCPU blocktime calculation for postcopy live migration.
vCPU blocktime - it's time since vCPU thread was put into
interruptible sleep, till memory page was copied and thread awake.

Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Alexey Perevalov <a.perevalov@samsung.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Alexey Perevalov 2017-10-30 16:16:25 +03:00 committed by Juan Quintela
parent 029ff892e1
commit 31bf06a9d6
3 changed files with 15 additions and 1 deletions
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9
migration/migration.c
View file

@ -1499,6 +1499,15 @@ bool migrate_zero_blocks(void)
return s->enabled_capabilities[MIGRATION_CAPABILITY_ZERO_BLOCKS];
}
bool migrate_postcopy_blocktime(void)
{
MigrationState *s;
s = migrate_get_current();
return s->enabled_capabilities[MIGRATION_CAPABILITY_POSTCOPY_BLOCKTIME];
}
bool migrate_use_compression(void)
{
MigrationState *s;

1
migration/migration.h
View file

@ -201,6 +201,7 @@ int migrate_compress_level(void);
int migrate_compress_threads(void);
int migrate_decompress_threads(void);
bool migrate_use_events(void);
bool migrate_postcopy_blocktime(void);
/* Sending on the return path - generic and then for each message type */
void migrate_send_rp_shut(MigrationIncomingState *mis,

6
qapi/migration.json
View file

@ -352,12 +352,16 @@
#
# @x-multifd: Use more than one fd for migration (since 2.11)
#
# @postcopy-blocktime: Calculate downtime for postcopy live migration
# (since 2.12)
#
# Since: 1.2
##
{ 'enum': 'MigrationCapability',
'data': ['xbzrle', 'rdma-pin-all', 'auto-converge', 'zero-blocks',
'compress', 'events', 'postcopy-ram', 'x-colo', 'release-ram',
'block', 'return-path', 'pause-before-switchover', 'x-multifd' ] }
'block', 'return-path', 'pause-before-switchover', 'x-multifd',
'postcopy-blocktime' ] }
##
# @MigrationCapabilityStatus: