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Wed, 11 Oct 2023 18:44:02 +0000 From: Elena Ufimtseva To: Cc: quintela@redhat.com, peterx@redhat.com, farosas@suse.de, leobras@redhat.com, qemu-devel@nongnu.org Subject: [PATCH v2 1/4] migration: check for rate_limit_max for RATE_LIMIT_DISABLED Date: Wed, 11 Oct 2023 11:43:55 -0700 Message-Id: <20231011184358.97349-2-elena.ufimtseva@oracle.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231011184358.97349-1-elena.ufimtseva@oracle.com> References: <20231011184358.97349-1-elena.ufimtseva@oracle.com> X-ClientProxiedBy: BY5PR20CA0025.namprd20.prod.outlook.com (2603:10b6:a03:1f4::38) To BYAPR10MB2869.namprd10.prod.outlook.com (2603:10b6:a03:85::17) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BYAPR10MB2869:EE_|PH7PR10MB7056:EE_ X-MS-Office365-Filtering-Correlation-Id: 59e07e62-5f5c-496e-ea49-08dbca8a09eb 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=mx0b-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. Note that with this patch we will also will stop flushing by not calling qemu_fflush() from migration_transferred_bytes() if the migration rate is not exceeded. This should be fine since migration thread calls in the loop migration_update_counters from migration_rate_limit() that calls the migration_transferred_bytes() and flushes there. Signed-off-by: Elena Ufimtseva Reviewed-by: Fabiano Rosas Reviewed-by: Peter Xu Reviewed-by: Juan Quintela --- migration/migration-stats.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/migration/migration-stats.c b/migration/migration-stats.c index 84e11e6dd8..4cc989d975 100644 --- a/migration/migration-stats.c +++ b/migration/migration-stats.c @@ -24,14 +24,15 @@ bool migration_rate_exceeded(QEMUFile *f) return true; } + uint64_t rate_limit_max = migration_rate_get(); + 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; - uint64_t rate_limit_max = stat64_get(&mig_stats.rate_limit_max); - if (rate_limit_max == RATE_LIMIT_DISABLED) { - return false; - } if (rate_limit_max > 0 && rate_limit_used > rate_limit_max) { return true; }