From patchwork Fri Jul 28 15:10:40 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: ~hyman X-Patchwork-Id: 1814617 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.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-ECDSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by legolas.ozlabs.org (Postfix) with ESMTPS id 4RDSRV1C1wz1yVt for ; Mon, 31 Jul 2023 03:05:10 +1000 (AEST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qQ9ap-00061i-Ld; Sun, 30 Jul 2023 12:48:31 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qQ9an-00060g-OH for qemu-devel@nongnu.org; Sun, 30 Jul 2023 12:48:29 -0400 Received: from mail-b.sr.ht ([173.195.146.151]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qQ9al-0005zU-HE for qemu-devel@nongnu.org; Sun, 30 Jul 2023 12:48:29 -0400 Authentication-Results: mail-b.sr.ht; dkim=none Received: from git.sr.ht (unknown [173.195.146.142]) by mail-b.sr.ht (Postfix) with ESMTPSA id 3825911EF32; Sun, 30 Jul 2023 16:48:26 +0000 (UTC) From: ~hyman Date: Fri, 28 Jul 2023 23:10:40 +0800 Subject: [PATCH QEMU v3 2/3] qapi: Craft the dirty-limit capability comment MIME-Version: 1.0 Message-ID: <169073570563.19893.2928364761104733482-2@git.sr.ht> X-Mailer: git.sr.ht In-Reply-To: <169073570563.19893.2928364761104733482-0@git.sr.ht> To: qemu-devel@nongnu.org Cc: Eric Blake , Markus Armbruster , Juan Quintela , Peter Xu , Leonardo Bras Received-SPF: pass client-ip=173.195.146.151; envelope-from=outgoing@sr.ht; helo=mail-b.sr.ht 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, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=unavailable 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: , Reply-To: ~hyman Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org From: Hyman Huang(黄勇) Signed-off-by: Markus Armbruster Signed-off-by: Hyman Huang(黄勇) Reviewed-by: Markus Armbruster --- qapi/migration.json | 13 +++++-------- 1 file changed, 5 insertions(+), 8 deletions(-) diff --git a/qapi/migration.json b/qapi/migration.json index a74ade4d72..62ab151da2 100644 --- a/qapi/migration.json +++ b/qapi/migration.json @@ -519,14 +519,11 @@ # are present. 'return-path' capability must be enabled to use # it. (since 8.1) # -# @dirty-limit: If enabled, migration will use the dirty-limit -# algorithim to throttle down guest instead of auto-converge -# algorithim. Throttle algorithim only works when vCPU's dirtyrate -# greater than 'vcpu-dirty-limit', read processes in guest os -# aren't penalized any more, so this algorithim can improve -# performance of vCPU during live migration. This is an optional -# performance feature and should not affect the correctness of the -# existing auto-converge algorithim. (Since 8.1) +# @dirty-limit: If enabled, migration will throttle vCPUs as needed to +# keep their dirty page rate within @vcpu-dirty-limit. This can +# improve responsiveness of large guests during live migration, +# and can result in more stable read performance. Requires KVM +# with accelerator property "dirty-ring-size" set. (Since 8.1) # # Features: #