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migration: Introduce dirty-limit capability

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Introduce migration dirty-limit capability, which can
be turned on before live migration and limit dirty
page rate durty live migration.

Introduce migrate_dirty_limit function to help check
if dirty-limit capability enabled during live migration.

Meanwhile, refactor vcpu_dirty_rate_stat_collect
so that period can be configured instead of hardcoded.

dirty-limit capability is kind of like auto-converge
but using dirty limit instead of traditional cpu-throttle
to throttle guest down. To enable this feature, turn on
the dirty-limit capability before live migration using
migrate-set-capabilities, and set the parameters
"x-vcpu-dirty-limit-period", "vcpu-dirty-limit" suitably
to speed up convergence.

Signed-off-by: Hyman Huang(黄勇) <yong.huang@smartx.com>
Acked-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Message-Id: <168618975839.6361.17407633874747688653-4@git.sr.ht>
Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Hyman Huang(黄勇) 2023-06-07 23:30:50 +08:00 • committed by Juan Quintela
parent 09f9ec9913
commit dc62395557
4 changed files with 49 additions and 6 deletions
Download patch file Download diff file Expand all files Collapse all files

23
migration/options.c
View file

@ -27,6 +27,7 @@
#include "qemu-file.h"
#include "ram.h"
#include "options.h"
#include "sysemu/kvm.h"
/* Maximum migrate downtime set to 2000 seconds */
#define MAX_MIGRATE_DOWNTIME_SECONDS 2000
@ -196,7 +197,7 @@ Property migration_properties[] = {
#endif
DEFINE_PROP_MIG_CAP("x-switchover-ack",
MIGRATION_CAPABILITY_SWITCHOVER_ACK),
DEFINE_PROP_MIG_CAP("x-dirty-limit", MIGRATION_CAPABILITY_DIRTY_LIMIT),
DEFINE_PROP_END_OF_LIST(),
};
@ -242,6 +243,13 @@ bool migrate_dirty_bitmaps(void)
return s->capabilities[MIGRATION_CAPABILITY_DIRTY_BITMAPS];
}
bool migrate_dirty_limit(void)
{
MigrationState *s = migrate_get_current();
return s->capabilities[MIGRATION_CAPABILITY_DIRTY_LIMIT];
}
bool migrate_events(void)
{
MigrationState *s = migrate_get_current();
@ -572,6 +580,19 @@ bool migrate_caps_check(bool *old_caps, bool *new_caps, Error **errp)
return false;
}
}
if (new_caps[MIGRATION_CAPABILITY_DIRTY_LIMIT]) {
if (new_caps[MIGRATION_CAPABILITY_AUTO_CONVERGE]) {
error_setg(errp, "dirty-limit conflicts with auto-converge"
" either of then available currently");
return false;
}
if (!kvm_enabled() || !kvm_dirty_ring_enabled()) {
error_setg(errp, "dirty-limit requires KVM with accelerator"
" property 'dirty-ring-size' set");
return false;
}
}
return true;
}