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migration: Implement dirty-limit convergence algo

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Implement dirty-limit convergence algo for live migration,
which is kind of like auto-converge algo but using dirty-limit
instead of cpu throttle to make migration convergent.

Enable dirty page limit if dirty_rate_high_cnt greater than 2
when dirty-limit capability enabled, Disable dirty-limit if
migration be canceled.

Note that "set_vcpu_dirty_limit", "cancel_vcpu_dirty_limit"
commands are not allowed during dirty-limit live migration.

Signed-off-by: Hyman Huang(黄勇) <yong.huang@smartx.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Message-ID: <168733225273.5845.15871826788879741674-7@git.sr.ht>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Hyman Huang(黄勇) 2023-06-08 00:12:40 +08:00 • committed by Juan Quintela
parent 310ad5625e
commit acac51ba24
4 changed files with 69 additions and 0 deletions
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3
migration/migration.c
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@ -166,6 +166,9 @@ void migration_cancel(const Error *error)
if (error) {
migrate_set_error(current_migration, error);
}
if (migrate_dirty_limit()) {
qmp_cancel_vcpu_dirty_limit(false, -1, NULL);
}
migrate_fd_cancel(current_migration);
}