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Mon, 09 Sep 2024 07:26:12 -0700 (PDT) Received: from localhost.localdomain ([118.114.94.226]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-718e58b2a88sm3561164b3a.46.2024.09.09.07.26.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 09 Sep 2024 07:26:12 -0700 (PDT) From: Hyman Huang To: qemu-devel@nongnu.org Cc: Peter Xu , Fabiano Rosas , Eric Blake , Markus Armbruster , David Hildenbrand , =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= , Paolo Bonzini , yong.huang@smartx.com Subject: [PATCH RESEND RFC 06/10] migration: Support periodic CPU throttle Date: Mon, 9 Sep 2024 22:25:39 +0800 Message-Id: X-Mailer: git-send-email 2.39.1 In-Reply-To: References: MIME-Version: 1.0 Received-SPF: pass client-ip=2001:4860:4864:20::2e; envelope-from=yong.huang@smartx.com; helo=mail-oa1-x2e.google.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, 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 When VM is configured with huge memory, the current throttle logic doesn't look like to scale, because migration_trigger_throttle() is only called for each iteration, so it won't be invoked for a long time if one iteration can take a long time. The periodic sync and throttle aims to fix the above issue by synchronizing the remote dirty bitmap and triggering the throttle periodically. This is a trade-off between synchronization overhead and CPU throttle impact. Signed-off-by: Hyman Huang --- migration/migration.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/migration/migration.c b/migration/migration.c index 055d527ff6..fefd93b683 100644 --- a/migration/migration.c +++ b/migration/migration.c @@ -1420,6 +1420,9 @@ static void migrate_fd_cleanup(MigrationState *s) qemu_thread_join(&s->thread); s->migration_thread_running = false; } + if (migrate_periodic_throttle()) { + periodic_throttle_stop(); + } bql_lock(); multifd_send_shutdown(); @@ -3263,6 +3266,9 @@ static MigIterateState migration_iteration_run(MigrationState *s) if ((!pending_size || pending_size < s->threshold_size) && can_switchover) { trace_migration_thread_low_pending(pending_size); + if (migrate_periodic_throttle()) { + periodic_throttle_stop(); + } migration_completion(s); return MIG_ITERATE_BREAK; } @@ -3508,6 +3514,11 @@ static void *migration_thread(void *opaque) ret = qemu_savevm_state_setup(s->to_dst_file, &local_err); bql_unlock(); + if (migrate_periodic_throttle()) { + periodic_throttle_setup(true); + periodic_throttle_start(); + } + qemu_savevm_wait_unplug(s, MIGRATION_STATUS_SETUP, MIGRATION_STATUS_ACTIVE);