From patchwork Thu Jun 6 01:31:38 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wei Yang X-Patchwork-Id: 10978189 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 429D91398 for ; Thu, 6 Jun 2019 01:33:19 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 317C3286F3 for ; Thu, 6 Jun 2019 01:33:19 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 2540B28780; Thu, 6 Jun 2019 01:33:19 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id BD965286FF for ; Thu, 6 Jun 2019 01:33:18 +0000 (UTC) Received: from localhost ([127.0.0.1]:52634 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hYhHJ-0006nK-LO for patchwork-qemu-devel@patchwork.kernel.org; Wed, 05 Jun 2019 21:33:17 -0400 Received: from eggs.gnu.org ([209.51.188.92]:40306) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hYhGK-0006Dl-FV for qemu-devel@nongnu.org; Wed, 05 Jun 2019 21:32:19 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hYhGJ-0001l1-2E for qemu-devel@nongnu.org; Wed, 05 Jun 2019 21:32:16 -0400 Received: from mga14.intel.com ([192.55.52.115]:32561) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hYhGI-0001jr-Pt for qemu-devel@nongnu.org; Wed, 05 Jun 2019 21:32:15 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by fmsmga103.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 05 Jun 2019 18:32:13 -0700 X-ExtLoop1: 1 Received: from richard.sh.intel.com (HELO localhost) ([10.239.159.54]) by FMSMGA003.fm.intel.com with ESMTP; 05 Jun 2019 18:32:12 -0700 From: Wei Yang To: qemu-devel@nongnu.org Date: Thu, 6 Jun 2019 09:31:38 +0800 Message-Id: <20190606013138.13312-3-richardw.yang@linux.intel.com> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20190606013138.13312-1-richardw.yang@linux.intel.com> References: <20190606013138.13312-1-richardw.yang@linux.intel.com> MIME-Version: 1.0 X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 192.55.52.115 Subject: [Qemu-devel] [PATCH 2/2] migration/xbzrle: cleanup the handling cache miss condition X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Wei Yang , dgilbert@redhat.com, quintela@redhat.com Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP For cache miss condition not in last_stage, we need to insert data into cache. When this step succeed, current_data should be updated. While no matter these checks pass or not, -1 is returned. Based on this, the logic in cache miss handling could be simplified a little. Signed-off-by: Wei Yang --- migration/ram.c | 17 ++++++++--------- 1 file changed, 8 insertions(+), 9 deletions(-) diff --git a/migration/ram.c b/migration/ram.c index 878cd8de7a..67ba075cc4 100644 --- a/migration/ram.c +++ b/migration/ram.c @@ -1572,15 +1572,14 @@ static int save_xbzrle_page(RAMState *rs, uint8_t **current_data, if (!cache_is_cached(XBZRLE.cache, current_addr, ram_counters.dirty_sync_count)) { xbzrle_counters.cache_miss++; - if (!last_stage) { - if (cache_insert(XBZRLE.cache, current_addr, *current_data, - ram_counters.dirty_sync_count) == -1) { - return -1; - } else { - /* update *current_data when the page has been - inserted into cache */ - *current_data = get_cached_data(XBZRLE.cache, current_addr); - } + if (!last_stage && + !cache_insert(XBZRLE.cache, current_addr, *current_data, + ram_counters.dirty_sync_count)) { + /* + * update *current_data when the page has been inserted into + * cache + */ + *current_data = get_cached_data(XBZRLE.cache, current_addr); } return -1; }