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migration: Add a semaphore to count PONGs

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This is mostly useless, but useful for us to know whether the main channel
is correctly established without changing the migration protocol.

Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Peter Xu 2023-02-08 15:28:12 -05:00 committed by Juan Quintela
parent fc063a7b8a
commit b28fb58227
2 changed files with 9 additions and 0 deletions
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3
migration/migration.c
View File

@ -3025,6 +3025,7 @@ retry:
case MIG_RP_MSG_PONG:
tmp32 = ldl_be_p(buf);
trace_source_return_path_thread_pong(tmp32);
qemu_sem_post(&ms->rp_state.rp_pong_acks);
break;
case MIG_RP_MSG_REQ_PAGES:
@ -4524,6 +4525,7 @@ static void migration_instance_finalize(Object *obj)
qemu_sem_destroy(&ms->postcopy_pause_sem);
qemu_sem_destroy(&ms->postcopy_pause_rp_sem);
qemu_sem_destroy(&ms->rp_state.rp_sem);
qemu_sem_destroy(&ms->rp_state.rp_pong_acks);
qemu_sem_destroy(&ms->postcopy_qemufile_src_sem);
error_free(ms->error);
}
@ -4570,6 +4572,7 @@ static void migration_instance_init(Object *obj)
qemu_sem_init(&ms->postcopy_pause_sem, 0);
qemu_sem_init(&ms->postcopy_pause_rp_sem, 0);
qemu_sem_init(&ms->rp_state.rp_sem, 0);
qemu_sem_init(&ms->rp_state.rp_pong_acks, 0);
qemu_sem_init(&ms->rate_limit_sem, 0);
qemu_sem_init(&ms->wait_unplug_sem, 0);
qemu_sem_init(&ms->postcopy_qemufile_src_sem, 0);

6
migration/migration.h
View File

@ -276,6 +276,12 @@ struct MigrationState {
*/
bool rp_thread_created;
QemuSemaphore rp_sem;
/*
* We post to this when we got one PONG from dest. So far it's an
* easy way to know the main channel has successfully established
* on dest QEMU.
*/
QemuSemaphore rp_pong_acks;
} rp_state;
double mbps;