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tests/qtest: make more migration pre-copy scenarios run non-live 

There are 27 pre-copy live migration scenarios being tested. In all of
these we force non-convergence and run for one iteration, then let it
converge and wait for completion during the second (or following)
iterations. At 3 mbps bandwidth limit the first iteration takes a very
long time (~30 seconds).

While it is important to test the migration passes and convergence
logic, it is overkill to do this for all 27 pre-copy scenarios. The
TLS migration scenarios in particular are merely exercising different
code paths during connection establishment.

To optimize time taken, switch most of the test scenarios to run
non-live (ie guest CPUs paused) with no bandwidth limits. This gives
a massive speed up for most of the test scenarios.

For test coverage the following scenarios are unchanged

 * Precopy with UNIX sockets
 * Precopy with UNIX sockets and dirty ring tracking
 * Precopy with XBZRLE
 * Precopy with UNIX compress
 * Precopy with UNIX compress (nowait)
 * Precopy with multifd

On a test machine this reduces execution time from 13 minutes to
8 minutes.

Tested-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20230601161347.1803440-10-berrange@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Daniel P. Berrangé 2023-06-01 17:13:46 +01:00 committed by Juan Quintela
parent 95014994e1
commit 3c4fb17723
1 changed files with 67 additions and 16 deletions
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83
tests/qtest/migration-test.c
View File

@ -577,9 +577,12 @@ typedef struct {
MIG_TEST_FAIL_DEST_QUIT_ERR,
} result;
/* Optional: set number of migration passes to wait for */
/* Optional: set number of migration passes to wait for, if live==true */
unsigned int iterations;
/* Optional: whether the guest CPUs should be running during migration */
bool live;
/* Postcopy specific fields */
void *postcopy_data;
bool postcopy_preempt;
@ -1385,8 +1388,6 @@ static void test_precopy_common(MigrateCommon *args)
return;
}
migrate_ensure_non_converge(from);
if (args->start_hook) {
data_hook = args->start_hook(from, to);
}
@ -1396,6 +1397,31 @@ static void test_precopy_common(MigrateCommon *args)
wait_for_serial("src_serial");
}
if (args->live) {
/*
* Testing live migration, we want to ensure that some
* memory is re-dirtied after being transferred, so that
* we exercise logic for dirty page handling. We achieve
* this with a ridiculosly low bandwidth that guarantees
* non-convergance.
*/
migrate_ensure_non_converge(from);
} else {
/*
* Testing non-live migration, we allow it to run at
* full speed to ensure short test case duration.
* For tests expected to fail, we don't need to
* change anything.
*/
if (args->result == MIG_TEST_SUCCEED) {
qtest_qmp_assert_success(from, "{ 'execute' : 'stop'}");
if (!got_src_stop) {
qtest_qmp_eventwait(from, "STOP");
}
migrate_ensure_converge(from);
}
}
if (!args->connect_uri) {
g_autofree char *local_connect_uri =
migrate_get_socket_address(to, "socket-address");
@ -1413,26 +1439,42 @@ static void test_precopy_common(MigrateCommon *args)
qtest_set_expected_status(to, EXIT_FAILURE);
}
} else {
if (args->iterations) {
while (args->iterations--) {
if (args->live) {
if (args->iterations) {
while (args->iterations--) {
wait_for_migration_pass(from);
}
} else {
wait_for_migration_pass(from);
}
migrate_ensure_converge(from);
/*
* We do this first, as it has a timeout to stop us
* hanging forever if migration didn't converge
*/
wait_for_migration_complete(from);
if (!got_src_stop) {
qtest_qmp_eventwait(from, "STOP");
}
} else {
wait_for_migration_pass(from);
wait_for_migration_complete(from);
/*
* Must wait for dst to finish reading all incoming
* data on the socket before issuing 'cont' otherwise
* it'll be ignored
*/
wait_for_migration_complete(to);
qtest_qmp_assert_success(to, "{ 'execute' : 'cont'}");
}
migrate_ensure_converge(from);
/* We do this first, as it has a timeout to stop us
* hanging forever if migration didn't converge */
wait_for_migration_complete(from);
if (!got_src_stop) {
qtest_qmp_eventwait(from, "STOP");
if (!got_dst_resume) {
qtest_qmp_eventwait(to, "RESUME");
}
qtest_qmp_eventwait(to, "RESUME");
wait_for_serial("dest_serial");
}
@ -1449,6 +1491,8 @@ static void test_precopy_unix_plain(void)
MigrateCommon args = {
.listen_uri = uri,
.connect_uri = uri,
.live = true,
};
test_precopy_common(&args);
@ -1464,6 +1508,8 @@ static void test_precopy_unix_dirty_ring(void)
},
.listen_uri = uri,
.connect_uri = uri,
.live = true,
};
test_precopy_common(&args);
@ -1575,6 +1621,7 @@ static void test_precopy_unix_xbzrle(void)
.start_hook = test_migrate_xbzrle_start,
.iterations = 2,
.live = true,
};
test_precopy_common(&args);
@ -1592,6 +1639,7 @@ static void test_precopy_unix_compress(void)
* the previous iteration.
*/
.iterations = 2,
.live = true,
};
test_precopy_common(&args);
@ -1609,6 +1657,7 @@ static void test_precopy_unix_compress_nowait(void)
* the previous iteration.
*/
.iterations = 2,
.live = true,
};
test_precopy_common(&args);
@ -2017,6 +2066,8 @@ static void test_multifd_tcp_none(void)
MigrateCommon args = {
.listen_uri = "defer",
.start_hook = test_migrate_precopy_tcp_multifd_start,
.live = true,
};
test_precopy_common(&args);
}