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Add a migration parameter for available bandwidth in switchover

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The new VIR_MIGRATE_PARAM_BANDWIDTH_AVAIL_SWITCHOVER parameter can be
used to override the estimated bandwidth that can be used for
transferring guest memory and device state once virtual CPUs are
stopped.

Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
This commit is contained in:
Jiri Denemark 2025-01-23 10:21:10 +01:00
parent 32cf090b84
commit c417ebf660
1 changed files with 18 additions and 0 deletions
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18
include/libvirt/libvirt-domain.h
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@ -1206,6 +1206,24 @@ typedef enum {
*/
# define VIR_MIGRATE_PARAM_BANDWIDTH_POSTCOPY "bandwidth.postcopy"
/**
* VIR_MIGRATE_PARAM_BANDWIDTH_AVAIL_SWITCHOVER:
*
* virDomainMigrate* params field: the bandwidth (in MiB/s) available for the
* final phase of (pre-copy) migration during which CPUs are stopped and all
* the remaining memory and device state is transferred. Knowing this bandwidth
* is important for accurate estimation of the domain downtime and deciding
* the right moment for switching over. Normally this would be estimated based
* on the bandwidth used by migration, but this could be lower than the actual
* available bandwidth. Using this parameter to override the computed value may
* help with migration convergence when the migration would keep iterating over
* and over thinking there's not enough bandwidth to comply with the configured
* maximum downtime.
*
* Since: 11.1.0
*/
# define VIR_MIGRATE_PARAM_BANDWIDTH_AVAIL_SWITCHOVER "bandwidth.avail.switchover"
/**
* VIR_MIGRATE_PARAM_GRAPHICS_URI:
*