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a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1708371900; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=Sks2JFeUF9PfTW2IGZp0Yr9KBnfVSOjSU4rOkcPoRic=; b=D21ASuyx8QcBpKMfVV2JwQls4i3SHK3AtFCcrMdKn8DQN5vAnuglzQrmEBMiQIT/aMJLp4 ktKlO07rJvCTnNDA== From: Fabiano Rosas To: qemu-devel@nongnu.org Cc: Peter Xu Subject: [PATCH] migration: Fix qmp_query_migrate mbps value Date: Mon, 19 Feb 2024 16:44:57 -0300 Message-Id: <20240219194457.26923-1-farosas@suse.de> X-Mailer: git-send-email 2.35.3 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Authentication-Results: smtp-out2.suse.de; none X-Spam-Score: 0.92 X-Spamd-Result: default: False [0.92 / 50.00]; RCVD_VIA_SMTP_AUTH(0.00)[]; TO_DN_SOME(0.00)[]; R_MISSING_CHARSET(2.50)[]; BROKEN_CONTENT_TYPE(1.50)[]; RCVD_COUNT_THREE(0.00)[3]; NEURAL_HAM_SHORT(-0.20)[-1.000]; RCPT_COUNT_TWO(0.00)[2]; FROM_EQ_ENVFROM(0.00)[]; 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charset="utf-8" The QMP command query_migrate might see incorrect throughput numbers if it runs after we've set the migration completion status but before migration_calculate_complete() has updated s->total_time and s->mbps. The migration status would show COMPLETED, but the throughput value would be the one from the last iteration and not the one from the whole migration. This will usually be a larger value due to the time period being smaller (one iteration). Move migration_calculate_complete() earlier so that the status MIGRATION_STATUS_COMPLETED is only emitted after the final counters update. Signed-off-by: Fabiano Rosas --- CI run: https://gitlab.com/farosas/qemu/-/pipelines/1182405776 --- migration/migration.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/migration/migration.c b/migration/migration.c index ab21de2cad..7486d59da0 100644 --- a/migration/migration.c +++ b/migration/migration.c @@ -102,6 +102,7 @@ static int migration_maybe_pause(MigrationState *s, int new_state); static void migrate_fd_cancel(MigrationState *s); static bool close_return_path_on_source(MigrationState *s); +static void migration_calculate_complete(MigrationState *s); =20 static void migration_downtime_start(MigrationState *s) { @@ -2746,6 +2747,7 @@ static void migration_completion(MigrationState *s) migrate_set_state(&s->state, MIGRATION_STATUS_ACTIVE, MIGRATION_STATUS_COLO); } else { + migration_calculate_complete(s); migrate_set_state(&s->state, current_active_state, MIGRATION_STATUS_COMPLETED); } @@ -2784,6 +2786,7 @@ static void bg_migration_completion(MigrationState *s) goto fail; } =20 + migration_calculate_complete(s); migrate_set_state(&s->state, current_active_state, MIGRATION_STATUS_COMPLETED); return; @@ -2993,12 +2996,15 @@ static void migration_calculate_complete(MigrationS= tate *s) int64_t end_time =3D qemu_clock_get_ms(QEMU_CLOCK_REALTIME); int64_t transfer_time; =20 + /* QMP could read from these concurrently */ + bql_lock(); migration_downtime_end(s); s->total_time =3D end_time - s->start_time; transfer_time =3D s->total_time - s->setup_time; if (transfer_time) { s->mbps =3D ((double) bytes * 8.0) / transfer_time / 1000; } + bql_unlock(); } =20 static void update_iteration_initial_status(MigrationState *s) @@ -3145,7 +3151,6 @@ static void migration_iteration_finish(MigrationState= *s) bql_lock(); switch (s->state) { case MIGRATION_STATUS_COMPLETED: - migration_calculate_complete(s); runstate_set(RUN_STATE_POSTMIGRATE); break; case MIGRATION_STATUS_COLO: @@ -3189,9 +3194,6 @@ static void bg_migration_iteration_finish(MigrationSt= ate *s) bql_lock(); switch (s->state) { case MIGRATION_STATUS_COMPLETED: - migration_calculate_complete(s); - break; - case MIGRATION_STATUS_ACTIVE: case MIGRATION_STATUS_FAILED: case MIGRATION_STATUS_CANCELLED: --=20 2.35.3