From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists1p.gnu.org (lists1p.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 0D261C88E7D for ; Tue, 15 Sep 2026 06:38:30 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists1p.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1x6Mni-0006gA-S7; Tue, 15 Sep 2026 02:37:54 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists1p.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1x6Mnf-0006fb-3F for qemu-devel@nongnu.org; Tue, 15 Sep 2026 02:37:51 -0400 Received: from [115.124.30.119] (helo=out30-119.freemail.mail.aliyun.com) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1x6MnY-0001Dd-V2 for qemu-devel@nongnu.org; Tue, 15 Sep 2026 02:37:50 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1789454241; h=From:To:Subject:Date:Message-ID:MIME-Version; bh=O/3GMptzb1vKo3c20lv2ZapZq0oWy8s8RzFdroAIFWA=; b=gZnjcX/wK0vfPtYwVmVXcGDlxRbofl5ezzpZcLO2cjIbH+bUDnqx2LG1aS9ytOmsfsZzphJPOoaJpaxD+2hzvzp1ObYTK07hYO0uzLQgB/ozYwKDoCIpUDa3Ige2FCRIOGf+er7kI053bxDrYuify8geLk9yj6j5BLD3puzzzuk= X-Alimail-AntiSpam: AC=PASS; BC=-1|-1; BR=01201311R391e4; CH=green; DM=||false|; DS=||; FP=0|-1|-1|-1|0|-1|-1|-1; HT=maildocker-contentspam033032089153; MF=guobin@linux.alibaba.com; NM=1; PH=DS; RN=4; SR=0; TI=SMTPD_---0XB0Kx0F_1789454239; Received: from localhost(mailfrom:guobin@linux.alibaba.com fp:SMTPD_---0XB0Kx0F_1789454239 cluster:ay36) by smtp.aliyun-inc.com; Tue, 15 Sep 2026 14:37:20 +0800 From: Bin Guo To: qemu-devel@nongnu.org Cc: peterx@redhat.com, farosas@suse.de, pierrick.bouvier@oss.qualcomm.com Subject: [PATCH 0/2] migration/postcopy: shared-fault accounting and multifd docs Date: Tue, 15 Sep 2026 14:37:17 +0800 Message-ID: <20260915063719.89031-1-guobin@linux.alibaba.com> X-Mailer: git-send-email 2.50.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Host-Lookup-Failed: Reverse DNS lookup failed for 115.124.30.119 (deferred) Received-SPF: pass client-ip=115.124.30.119; envelope-from=guobin@linux.alibaba.com; helo=out30-119.freemail.mail.aliyun.com X-Spam_score_int: -166 X-Spam_score: -16.7 X-Spam_bar: ---------------- X-Spam_report: (-16.7 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, ENV_AND_HDR_SPF_MATCH=-0.5, RCVD_IN_DNSWL_NONE=-0.0001, RDNS_NONE=0.793, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001, USER_IN_DEF_DKIM_WL=-7.5, USER_IN_DEF_SPF_WL=-7.5 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Two small patches from the same investigation of the postcopy shared-page-fault path: - Patch 1 documents that multifd and postcopy-ram can be enabled together since the 10.1 release, and how the two features interact. - Patch 2 resolves the "TODO: support blocktime tracking" in postcopy_request_shared_page() by reporting faults taken by memory sharing processes (e.g. a vhost-user backend) with a foreign tid, so they show up in the latency reports without polluting the vCPU blocktime ones. The patches are independent of each other; patch 2 was verified with a vhost-user postcopy migration, where the shared faults now show up in the latency reports and the page request accounting stays balanced. Bin Guo (2): docs/migration: document that postcopy can be used with multifd migration/postcopy: account faults taken by memory sharing processes docs/devel/migration/postcopy.rst | 26 ++++++++++++++++++++++++++ migration/postcopy-ram.c | 26 ++++++++++++++++---------- migration/postcopy-ram.h | 10 ++++++++++ 3 files changed, 52 insertions(+), 10 deletions(-) -- 2.50.1 (Apple Git-155)