Commit f22f928e authored by Alexey Perevalov's avatar Alexey Perevalov Committed by Dr. David Alan Gilbert
Browse files

migration: introduce postcopy-blocktime capability 



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: default avatarDr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: default avatarAlexey Perevalov <a.perevalov@samsung.com>
Reviewed-by: default avatarJuan Quintela <quintela@redhat.com>
Signed-off-by: default avatarJuan Quintela <quintela@redhat.com>
Message-Id: <1521742647-25550-2-git-send-email-a.perevalov@samsung.com>
Signed-off-by: default avatarDr. David Alan Gilbert <dgilbert@redhat.com>
parent 4743c235

migration/migration.c

+9 −0
Original line number Diff line number Diff line
@@ -1541,6 +1541,15 @@ 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;

migration/migration.h

+1 −0
Original line number Diff line number Diff line
@@ -230,6 +230,7 @@ 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,

qapi/migration.json

+5 −1
Original line number Diff line number Diff line
@@ -354,16 +354,20 @@ 
#

# @x-multifd: Use more than one fd for migration (since 2.11)

#

#

# @dirty-bitmaps: If enabled, QEMU will migrate named dirty bitmaps.

#                 (since 2.12)

#

# @postcopy-blocktime: Calculate downtime for postcopy live migration

#                     (since 2.13)

#

# 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',

           'dirty-bitmaps' ] }

           'dirty-bitmaps', 'postcopy-blocktime' ] }



##

# @MigrationCapabilityStatus: