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Re: [PATCH V4 07/11] tests/qtest: migration events
From: |
Peter Xu |
Subject: |
Re: [PATCH V4 07/11] tests/qtest: migration events |
Date: |
Wed, 30 Aug 2023 13:00:41 -0400 |
On Tue, Aug 29, 2023 at 11:18:02AM -0700, Steve Sistare wrote:
> Define a state object to capture events seen by migration tests, to allow
> more events to be captured in a subsequent patch, and simplify event
> checking in wait_for_migration_pass. No functional change.
>
> Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
> Reviewed-by: Fabiano Rosas <farosas@suse.de>
> ---
> tests/qtest/migration-helpers.c | 24 +++++----------
> tests/qtest/migration-helpers.h | 8 +++--
> tests/qtest/migration-test.c | 68
> +++++++++++++++++++----------------------
> 3 files changed, 44 insertions(+), 56 deletions(-)
>
> diff --git a/tests/qtest/migration-helpers.c b/tests/qtest/migration-helpers.c
> index be00c52..b541108 100644
> --- a/tests/qtest/migration-helpers.c
> +++ b/tests/qtest/migration-helpers.c
> @@ -23,26 +23,16 @@
> */
> #define MIGRATION_STATUS_WAIT_TIMEOUT 120
>
> -bool migrate_watch_for_stop(QTestState *who, const char *name,
> - QDict *event, void *opaque)
> -{
> - bool *seen = opaque;
> -
> - if (g_str_equal(name, "STOP")) {
> - *seen = true;
> - return true;
> - }
> -
> - return false;
> -}
> -
> -bool migrate_watch_for_resume(QTestState *who, const char *name,
> +bool migrate_watch_for_events(QTestState *who, const char *name,
> QDict *event, void *opaque)
> {
> - bool *seen = opaque;
> + QTestMigrationState *state = opaque;
>
> - if (g_str_equal(name, "RESUME")) {
> - *seen = true;
> + if (g_str_equal(name, "STOP")) {
> + state->stop_seen = true;
> + return true;
> + } else if (g_str_equal(name, "RESUME")) {
> + state->resume_seen = true;
> return true;
> }
>
> diff --git a/tests/qtest/migration-helpers.h b/tests/qtest/migration-helpers.h
> index 009e250..59fbb83 100644
> --- a/tests/qtest/migration-helpers.h
> +++ b/tests/qtest/migration-helpers.h
> @@ -15,9 +15,11 @@
>
> #include "libqtest.h"
>
> -bool migrate_watch_for_stop(QTestState *who, const char *name,
> - QDict *event, void *opaque);
> -bool migrate_watch_for_resume(QTestState *who, const char *name,
> +typedef struct QTestMigrationState {
> + bool stop_seen, resume_seen;
> +} QTestMigrationState;
> +
> +bool migrate_watch_for_events(QTestState *who, const char *name,
> QDict *event, void *opaque);
>
> G_GNUC_PRINTF(3, 4)
> diff --git a/tests/qtest/migration-test.c b/tests/qtest/migration-test.c
> index 62d3f37..526a1b7 100644
> --- a/tests/qtest/migration-test.c
> +++ b/tests/qtest/migration-test.c
> @@ -43,8 +43,8 @@
> unsigned start_address;
> unsigned end_address;
> static bool uffd_feature_thread_id;
> -static bool got_src_stop;
> -static bool got_dst_resume;
> +static QTestMigrationState src_state;
> +static QTestMigrationState dst_state;
>
> /*
> * An initial 3 MB offset is used as that corresponds
> @@ -188,6 +188,13 @@ static void wait_for_serial(const char *side)
> } while (true);
> }
>
> +static void wait_for_stop(QTestState *who, QTestMigrationState *state)
> +{
> + if (!state->stop_seen) {
> + qtest_qmp_eventwait(who, "STOP");
> + }
> +}
> +
> /*
> * It's tricky to use qemu's migration event capability with qtest,
> * events suddenly appearing confuse the qmp()/hmp() responses.
> @@ -235,21 +242,19 @@ static void read_blocktime(QTestState *who)
> qobject_unref(rsp_return);
> }
>
> +/*
> + * Wait for two changes in the migration pass count, but bail if we stop.
> + */
> static void wait_for_migration_pass(QTestState *who)
> {
> - uint64_t initial_pass = get_migration_pass(who);
> - uint64_t pass;
> + uint64_t pass, prev_pass = 0, changes = 0;
>
> - /* Wait for the 1st sync */
> - while (!got_src_stop && !initial_pass) {
> - usleep(1000);
> - initial_pass = get_migration_pass(who);
> - }
> -
> - do {
> + while (changes < 2 && !src_state.stop_seen) {
> usleep(1000);
> pass = get_migration_pass(who);
> - } while (pass == initial_pass && !got_src_stop);
> + changes += (pass != prev_pass);
> + prev_pass = pass;
> + }
Here won't it start to wait for 2 iterations every time instead of 1?
Note that previously we only wait for 1 iteration as long as not the
initial pass. And I think the change will double the counts for below..
while (args->iterations > 1) {
wait_for_migration_pass(from);
args->iterations--;
}
The event-related changes are all fine, but maybe leave this piece as before?
> }
>
> static void check_guests_ram(QTestState *who)
> @@ -586,10 +591,7 @@ static void migrate_postcopy_start(QTestState *from,
> QTestState *to)
> {
> qtest_qmp_assert_success(from, "{ 'execute': 'migrate-start-postcopy'
> }");
>
> - if (!got_src_stop) {
> - qtest_qmp_eventwait(from, "STOP");
> - }
> -
> + wait_for_stop(from, &src_state);
> qtest_qmp_eventwait(to, "RESUME");
> }
>
> @@ -720,8 +722,9 @@ static int test_migrate_start(QTestState **from,
> QTestState **to,
> }
> }
>
> - got_src_stop = false;
> - got_dst_resume = false;
> + dst_state = (QTestMigrationState) { };
> + src_state = (QTestMigrationState) { };
> +
> bootpath = g_strdup_printf("%s/bootsect", tmpfs);
> if (strcmp(arch, "i386") == 0 || strcmp(arch, "x86_64") == 0) {
> /* the assembled x86 boot sector should be exactly one sector large
> */
> @@ -801,8 +804,8 @@ static int test_migrate_start(QTestState **from,
> QTestState **to,
> if (!args->only_target) {
> *from = qtest_init(cmd_source);
> qtest_qmp_set_event_callback(*from,
> - migrate_watch_for_stop,
> - &got_src_stop);
> + migrate_watch_for_events,
> + &src_state);
> }
>
> cmd_target = g_strdup_printf("-accel kvm%s -accel tcg "
> @@ -821,8 +824,8 @@ static int test_migrate_start(QTestState **from,
> QTestState **to,
> ignore_stderr);
> *to = qtest_init(cmd_target);
> qtest_qmp_set_event_callback(*to,
> - migrate_watch_for_resume,
> - &got_dst_resume);
> + migrate_watch_for_events,
> + &dst_state);
>
> /*
> * Remove shmem file immediately to avoid memory leak in test failed
> case.
> @@ -1516,9 +1519,7 @@ static void test_precopy_common(MigrateCommon *args)
> */
> if (args->result == MIG_TEST_SUCCEED) {
> qtest_qmp_assert_success(from, "{ 'execute' : 'stop'}");
> - if (!got_src_stop) {
> - qtest_qmp_eventwait(from, "STOP");
> - }
> + wait_for_stop(from, &src_state);
> migrate_ensure_converge(from);
> }
> }
> @@ -1560,9 +1561,8 @@ static void test_precopy_common(MigrateCommon *args)
> */
> wait_for_migration_complete(from);
>
> - if (!got_src_stop) {
> - qtest_qmp_eventwait(from, "STOP");
> - }
> + wait_for_stop(from, &src_state);
> +
> } else {
> wait_for_migration_complete(from);
> /*
> @@ -1575,7 +1575,7 @@ static void test_precopy_common(MigrateCommon *args)
> qtest_qmp_assert_success(to, "{ 'execute' : 'cont'}");
> }
>
> - if (!got_dst_resume) {
> + if (!dst_state.resume_seen) {
> qtest_qmp_eventwait(to, "RESUME");
> }
>
> @@ -1696,9 +1696,7 @@ static void test_ignore_shared(void)
>
> migrate_wait_for_dirty_mem(from, to);
>
> - if (!got_src_stop) {
> - qtest_qmp_eventwait(from, "STOP");
> - }
> + wait_for_stop(from, &src_state);
>
> qtest_qmp_eventwait(to, "RESUME");
>
> @@ -2139,7 +2137,7 @@ static void test_migrate_auto_converge(void)
> break;
> }
> usleep(20);
> - g_assert_false(got_src_stop);
> + g_assert_false(src_state.stop_seen);
> } while (true);
> /* The first percentage of throttling should be at least init_pct */
> g_assert_cmpint(percentage, >=, init_pct);
> @@ -2481,9 +2479,7 @@ static void test_multifd_tcp_cancel(void)
>
> migrate_ensure_converge(from);
>
> - if (!got_src_stop) {
> - qtest_qmp_eventwait(from, "STOP");
> - }
> + wait_for_stop(from, &src_state);
> qtest_qmp_eventwait(to2, "RESUME");
>
> wait_for_serial("dest_serial");
> --
> 1.8.3.1
>
--
Peter Xu
- [PATCH V4 00/11] fix migration of suspended runstate, Steve Sistare, 2023/08/29
- [PATCH V4 07/11] tests/qtest: migration events, Steve Sistare, 2023/08/29
- Re: [PATCH V4 07/11] tests/qtest: migration events,
Peter Xu <=
- [PATCH V4 01/11] cpus: pass runstate to vm_prepare_start, Steve Sistare, 2023/08/29
- [PATCH V4 02/11] migration: preserve suspended runstate, Steve Sistare, 2023/08/29
- [PATCH V4 06/11] migration: preserve cpu ticks if suspended, Steve Sistare, 2023/08/29
- [PATCH V4 03/11] migration: add runstate function, Steve Sistare, 2023/08/29
- [PATCH V4 05/11] migration: preserve suspended for bg_migration, Steve Sistare, 2023/08/29