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add 'release-ram' migrate capability

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This feature frees the migrated memory on the source during postcopy-ram
migration. In the second step of postcopy-ram migration when the source vm
is put on pause we can free unnecessary memory. It will allow, in particular,
to start relaxing the memory stress on the source host in a load-balancing
scenario.

Signed-off-by: Pavel Butsykin <pbutsykin@virtuozzo.com>
Message-Id: <20170203152321.19739-3-pbutsykin@virtuozzo.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
   Manually merged in Pavel's 'migration: madvise error_report fixup!'
This commit is contained in:
Pavel Butsykin 2017-02-03 18:23:20 +03:00 • committed by Dr. David Alan Gilbert
parent 9eb1476610
commit 53f09a1076
6 changed files with 89 additions and 10 deletions
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1
include/migration/migration.h
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@ -304,6 +304,7 @@ int migrate_add_blocker(Error *reason, Error **errp);
*/
void migrate_del_blocker(Error *reason);
bool migrate_release_ram(void);
bool migrate_postcopy_ram(void);
bool migrate_zero_blocks(void);

3
include/migration/qemu-file.h
View file

@ -132,7 +132,8 @@ void qemu_put_byte(QEMUFile *f, int v);
* put_buffer without copying the buffer.
* The buffer should be available till it is sent asynchronously.
*/
void qemu_put_buffer_async(QEMUFile *f, const uint8_t *buf, size_t size);
void qemu_put_buffer_async(QEMUFile *f, const uint8_t *buf, size_t size,
bool may_free);
bool qemu_file_mode_is_not_valid(const char *mode);
bool qemu_file_is_writable(QEMUFile *f);