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COLO: Send PVM state to secondary side when do checkpoint

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VM checkpointing is to synchronize the state of PVM to SVM, just
like migration does, we re-use save helpers to achieve migrating
PVM's state to Secondary side.

COLO need to cache the data of VM's state in the secondary side before
synchronize it to SVM. COLO need the size of the data to determine
how much data should be read in the secondary side.
So here, we can get the size of the data by saving it into I/O channel
before send it to the secondary side.

Signed-off-by: zhanghailiang <zhang.zhanghailiang@huawei.com>
Signed-off-by: Gonglei <arei.gonglei@huawei.com>
Signed-off-by: Li Zhijian <lizhijian@cn.fujitsu.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Cc: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Amit Shah <amit@amitshah.net>
This commit is contained in:
zhanghailiang 2016-10-27 14:42:59 +08:00 • committed by Amit Shah
parent 21142ba7ff
commit a91246c95f
2 changed files with 105 additions and 17 deletions
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37
migration/ram.c
View file

@ -43,6 +43,7 @@
#include "trace.h"
#include "exec/ram_addr.h"
#include "qemu/rcu_queue.h"
#include "migration/colo.h"
#ifdef DEBUG_MIGRATION_RAM
#define DPRINTF(fmt, ...) \
@ -1871,16 +1872,8 @@ err:
return ret;
}
/* Each of ram_save_setup, ram_save_iterate and ram_save_complete has
* long-running RCU critical section. When rcu-reclaims in the code
* start to become numerous it will be necessary to reduce the
* granularity of these critical sections.
*/
static int ram_save_setup(QEMUFile *f, void *opaque)
static int ram_save_init_globals(void)
{
RAMBlock *block;
int64_t ram_bitmap_pages; /* Size of bitmap in pages, including gaps */
dirty_rate_high_cnt = 0;
@ -1947,6 +1940,29 @@ static int ram_save_setup(QEMUFile *f, void *opaque)
migration_bitmap_sync();
qemu_mutex_unlock_ramlist();
qemu_mutex_unlock_iothread();
rcu_read_unlock();
return 0;
}
/* Each of ram_save_setup, ram_save_iterate and ram_save_complete has
* long-running RCU critical section. When rcu-reclaims in the code
* start to become numerous it will be necessary to reduce the
* granularity of these critical sections.
*/
static int ram_save_setup(QEMUFile *f, void *opaque)
{
RAMBlock *block;
/* migration has already setup the bitmap, reuse it. */
if (!migration_in_colo_state()) {
if (ram_save_init_globals() < 0) {
return -1;
}
}
rcu_read_lock();
qemu_put_be64(f, ram_bytes_total() | RAM_SAVE_FLAG_MEM_SIZE);
@ -2048,7 +2064,8 @@ static int ram_save_complete(QEMUFile *f, void *opaque)
while (true) {
int pages;
pages = ram_find_and_save_block(f, true, &bytes_transferred);
pages = ram_find_and_save_block(f, !migration_in_colo_state(),
&bytes_transferred);
/* no more blocks to sent */
if (pages == 0) {
break;