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Fri, 22 Sep 2023 06:56:34 +0000 From: Elena Ufimtseva To: quintela@redhat.com, peterx@redhat.com, leobras@redhat.com Cc: elena.ufimtseva@oracle.com, qemu-devel@nongnu.org Subject: [PATCH 2/4] migration: check for rate_limit_max for RATE_LIMIT_DISABLED Date: Thu, 21 Sep 2023 23:56:23 -0700 Message-Id: <20230922065625.21848-3-elena.ufimtseva@oracle.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230922065625.21848-1-elena.ufimtseva@oracle.com> References: <20230922065625.21848-1-elena.ufimtseva@oracle.com> X-ClientProxiedBy: BYAPR11CA0066.namprd11.prod.outlook.com (2603:10b6:a03:80::43) To BYAPR10MB2869.namprd10.prod.outlook.com (2603:10b6:a03:85::17) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BYAPR10MB2869:EE_|IA1PR10MB7419:EE_ X-MS-Office365-Filtering-Correlation-Id: 15007204-9999-401c-482e-08dbbb390f3d X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255; 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envelope-from=elena.ufimtseva@oracle.com; helo=mx0a-00069f02.pphosted.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org In migration rate limiting atomic operations are used to read the rate limit variables and transferred bytes and they are expensive. Check first if rate_limit_max is equal to RATE_LIMIT_DISABLED and return false immediately if so. Signed-off-by: Elena Ufimtseva Reviewed-by: Fabiano Rosas Reviewed-by: Peter Xu --- migration/migration-stats.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/migration/migration-stats.c b/migration/migration-stats.c index 095d6d75bb..abc31483d5 100644 --- a/migration/migration-stats.c +++ b/migration/migration-stats.c @@ -24,14 +24,14 @@ bool migration_rate_exceeded(QEMUFile *f) return true; } - uint64_t rate_limit_start = stat64_get(&mig_stats.rate_limit_start); - uint64_t rate_limit_current = migration_transferred_bytes(f); - uint64_t rate_limit_used = rate_limit_current - rate_limit_start; uint64_t rate_limit_max = stat64_get(&mig_stats.rate_limit_max); - if (rate_limit_max == RATE_LIMIT_DISABLED) { return false; } + uint64_t rate_limit_start = stat64_get(&mig_stats.rate_limit_start); + uint64_t rate_limit_current = migration_transferred_bytes(f); + uint64_t rate_limit_used = rate_limit_current - rate_limit_start; + if (rate_limit_max > 0 && rate_limit_used > rate_limit_max) { return true; }