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COLO: Optimize memory back-up process

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This patch will reduce the downtime of VM for the initial process,
Previously, we copied all these memory in preparing stage of COLO
while we need to stop VM, which is a time-consuming process.
Here we optimize it by a trick, back-up every page while in migration
process while COLO is enabled, though it affects the speed of the
migration, but it obviously reduce the downtime of back-up all SVM'S
memory in COLO preparing stage.

Signed-off-by: zhanghailiang <zhang.zhanghailiang@huawei.com>
Message-Id: <20200224065414.36524-5-zhang.zhanghailiang@huawei.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
  minor typo fixes
This commit is contained in:
zhanghailiang 2020-02-24 14:54:10 +08:00 • committed by Dr. David Alan Gilbert
parent dc14a47076
commit 0393031a16
3 changed files with 53 additions and 17 deletions
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3
migration/colo.c
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@ -26,6 +26,7 @@
#include "qemu/main-loop.h"
#include "qemu/rcu.h"
#include "migration/failover.h"
#include "migration/ram.h"
#ifdef CONFIG_REPLICATION
#include "replication.h"
#endif
@ -845,6 +846,8 @@ void *colo_process_incoming_thread(void *opaque)
*/
qemu_file_set_blocking(mis->from_src_file, true);
colo_incoming_start_dirty_log();
bioc = qio_channel_buffer_new(COLO_BUFFER_BASE_SIZE);
fb = qemu_fopen_channel_input(QIO_CHANNEL(bioc));
object_unref(OBJECT(bioc));