6eeb63f740
This patch adds the free page optimization enable flag, and a function to set this flag. When the free page optimization is enabled, not all the pages are needed to be sent in the bulk stage. Why using a new flag, instead of directly disabling ram_bulk_stage when the optimization is running? Thanks for Peter Xu's reminder that disabling ram_bulk_stage will affect the use of compression. Please see save_page_use_compression. When xbzrle and compression are used, if free page optimizaion causes the ram_bulk_stage to be disabled, save_page_use_compression will return false, which disables the use of compression. That is, if free page optimization avoids the sending of half of the guest pages, the other half of pages loses the benefits of compression in the meantime. Using a new flag to let migration_bitmap_find_dirty skip the free pages in the bulk stage will avoid the above issue. Signed-off-by: Wei Wang <wei.w.wang@intel.com> CC: Dr. David Alan Gilbert <dgilbert@redhat.com> CC: Juan Quintela <quintela@redhat.com> CC: Michael S. Tsirkin <mst@redhat.com> CC: Peter Xu <peterx@redhat.com> Message-Id: <1544516693-5395-7-git-send-email-wei.w.wang@intel.com> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
77 lines
2.0 KiB
C
77 lines
2.0 KiB
C
/*
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* QEMU migration miscellaneus exported functions
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*
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* Copyright IBM, Corp. 2008
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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*/
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#ifndef MIGRATION_MISC_H
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#define MIGRATION_MISC_H
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#include "exec/cpu-common.h"
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#include "qemu/notify.h"
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#include "qapi/qapi-types-net.h"
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/* migration/ram.c */
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typedef enum PrecopyNotifyReason {
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PRECOPY_NOTIFY_SETUP = 0,
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PRECOPY_NOTIFY_BEFORE_BITMAP_SYNC = 1,
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PRECOPY_NOTIFY_AFTER_BITMAP_SYNC = 2,
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PRECOPY_NOTIFY_COMPLETE = 3,
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PRECOPY_NOTIFY_CLEANUP = 4,
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PRECOPY_NOTIFY_MAX = 5,
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} PrecopyNotifyReason;
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typedef struct PrecopyNotifyData {
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enum PrecopyNotifyReason reason;
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Error **errp;
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} PrecopyNotifyData;
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void precopy_infrastructure_init(void);
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void precopy_add_notifier(NotifierWithReturn *n);
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void precopy_remove_notifier(NotifierWithReturn *n);
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int precopy_notify(PrecopyNotifyReason reason, Error **errp);
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void precopy_enable_free_page_optimization(void);
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void ram_mig_init(void);
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void qemu_guest_free_page_hint(void *addr, size_t len);
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/* migration/block.c */
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#ifdef CONFIG_LIVE_BLOCK_MIGRATION
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void blk_mig_init(void);
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#else
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static inline void blk_mig_init(void) {}
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#endif
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AnnounceParameters *migrate_announce_params(void);
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/* migration/savevm.c */
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void dump_vmstate_json_to_file(FILE *out_fp);
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/* migration/migration.c */
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void migration_object_init(void);
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void migration_shutdown(void);
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void qemu_start_incoming_migration(const char *uri, Error **errp);
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bool migration_is_idle(void);
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void add_migration_state_change_notifier(Notifier *notify);
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void remove_migration_state_change_notifier(Notifier *notify);
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bool migration_in_setup(MigrationState *);
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bool migration_has_finished(MigrationState *);
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bool migration_has_failed(MigrationState *);
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/* ...and after the device transmission */
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bool migration_in_postcopy_after_devices(MigrationState *);
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void migration_global_dump(Monitor *mon);
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/* migration/block-dirty-bitmap.c */
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void dirty_bitmap_mig_init(void);
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#endif
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