From patchwork Tue Feb 23 02:16:44 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kunkun Jiang X-Patchwork-Id: 1443370 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 4Dl2nv73jvz9sS8 for ; Tue, 23 Feb 2021 13:20:19 +1100 (AEDT) Received: from localhost ([::1]:50180 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lENJC-0003hV-0I for incoming@patchwork.ozlabs.org; Mon, 22 Feb 2021 21:20:18 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:51982) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lENGr-0001r4-QR for qemu-devel@nongnu.org; Mon, 22 Feb 2021 21:17:53 -0500 Received: from szxga07-in.huawei.com ([45.249.212.35]:2653) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lENGo-0006Wu-SN for qemu-devel@nongnu.org; Mon, 22 Feb 2021 21:17:53 -0500 Received: from DGGEMS410-HUB.china.huawei.com (unknown [172.30.72.59]) by szxga07-in.huawei.com (SkyGuard) with ESMTP id 4Dl2j735qTz7pKx; Tue, 23 Feb 2021 10:16:11 +0800 (CST) Received: from DESKTOP-6NKE0BC.china.huawei.com (10.174.185.210) by DGGEMS410-HUB.china.huawei.com (10.3.19.210) with Microsoft SMTP Server id 14.3.498.0; Tue, 23 Feb 2021 10:17:34 +0800 From: Kunkun Jiang To: Juan Quintela , "Dr . David Alan Gilbert" , "open list:All patches CC here" Subject: [PATCH 2/3] migration/ram: Modify ram_save_host_page() to match the comment Date: Tue, 23 Feb 2021 10:16:44 +0800 Message-ID: <20210223021646.500-3-jiangkunkun@huawei.com> X-Mailer: git-send-email 2.26.2.windows.1 In-Reply-To: <20210223021646.500-1-jiangkunkun@huawei.com> References: <20210223021646.500-1-jiangkunkun@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.174.185.210] X-CFilter-Loop: Reflected Received-SPF: pass client-ip=45.249.212.35; envelope-from=jiangkunkun@huawei.com; helo=szxga07-in.huawei.com X-Spam_score_int: -41 X-Spam_score: -4.2 X-Spam_bar: ---- X-Spam_report: (-4.2 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H4=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: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Zenghui Yu , wanghaibin.wang@huawei.com, Keqian Zhu Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" According to the comment, when the host page is a huge page, the migration_rate_limit() should be executed. If not, this function can be omitted to save time. Signed-off-by: Keqian Zhu Signed-off-by: Kunkun Jiang --- migration/ram.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/migration/ram.c b/migration/ram.c index fc49c3f898..c7e18dc2fc 100644 --- a/migration/ram.c +++ b/migration/ram.c @@ -2017,7 +2017,9 @@ static int ram_save_host_page(RAMState *rs, PageSearchStatus *pss, pages += tmppages; pss->page++; /* Allow rate limiting to happen in the middle of huge pages */ - migration_rate_limit(); + if (pagesize_bits > 1) { + migration_rate_limit(); + } } while ((pss->page & (pagesize_bits - 1)) && offset_in_ramblock(pss->block, ((ram_addr_t)pss->page) << TARGET_PAGE_BITS));