Re: [Qemu-devel] [PATCH v4 10/11] tests: Adjust sleeps for migration test

[Dr. David Alan Gilbert]

* Juan Quintela (address@hidden) wrote:
> Also reorder code to not sleep when event already happened.
> 
> Signed-off-by: Juan Quintela <address@hidden>
> ---
>  tests/migration-test.c | 29 ++++++++++++++---------------
>  1 file changed, 14 insertions(+), 15 deletions(-)
> 
> diff --git a/tests/migration-test.c b/tests/migration-test.c
> index 70b3c0870b..8914829006 100644
> --- a/tests/migration-test.c
> +++ b/tests/migration-test.c
> @@ -280,10 +280,9 @@ static void read_blocktime(QTestState *who)
>  
>  static void wait_for_migration_complete(QTestState *who)
>  {
> -    QDict *rsp, *rsp_return;
> -    bool completed;
> -
> -    do {
> +    while (true) {
> +        QDict *rsp, *rsp_return;
> +        bool completed;
>          const char *status;
>  
>          rsp = wait_command(who, "{ 'execute': 'query-migrate' }");
> @@ -292,8 +291,11 @@ static void wait_for_migration_complete(QTestState *who)
>          completed = strcmp(status, "completed") == 0;
>          g_assert_cmpstr(status, !=,  "failed");
>          QDECREF(rsp);
> -        usleep(1000 * 100);
> -    } while (!completed);
> +        if (completed) {
> +            return;
> +        }
> +        usleep(1000);
> +    }

OK, so that's mostly about avoiding a sleep in the exit from the normal
path.

>  }
>  
>  static void wait_for_migration_pass(QTestState *who)
> @@ -302,16 +304,13 @@ static void wait_for_migration_pass(QTestState *who)
>      uint64_t pass;
>  
>      /* Wait for the 1st sync */
> -    do {
> +    while (!got_stop && !initial_pass) {
> +        usleep(1000);
>          initial_pass = get_migration_pass(who);
> -        if (got_stop || initial_pass) {
> -            break;
> -        }
> -        usleep(1000 * 100);
> -    } while (true);
> +    }
>  
>      do {
> -        usleep(1000 * 100);
> +        usleep(1000);
>          pass = get_migration_pass(who);
>      } while (pass == initial_pass && !got_stop);
>  }

OK

> @@ -510,13 +509,13 @@ static void test_migrate_end(QTestState *from, 
> QTestState *to)
>      /* Destination still running, wait for a byte to change */
>      do {
>          qtest_memread(to, start_address, &dest_byte_b, 1);
> -        usleep(10 * 1000);
> +        usleep(1000 * 10);

Profound :-)

>      } while (dest_byte_a == dest_byte_b);
>  
>      qtest_qmp_discard_response(to, "{ 'execute' : 'stop'}");
>      /* With it stopped, check nothing changes */
>      qtest_memread(to, start_address, &dest_byte_c, 1);
> -    sleep(1);
> +    usleep(1000 * 200);

OK

>      qtest_memread(to, start_address, &dest_byte_d, 1);
>      g_assert_cmpint(dest_byte_c, ==, dest_byte_d);



Reviewed-by: Dr. David Alan Gilbert <address@hidden>

> -- 
> 2.14.3
> 
--
Dr. David Alan Gilbert / address@hidden / Manchester, UK