From patchwork Tue Jun 8 07:33:39 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Emanuele Giuseppe Esposito X-Patchwork-Id: 1489141 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=) Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=hBQfZAMM; dkim-atps=neutral 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 4Fzhp50zbMz9s24 for ; Tue, 8 Jun 2021 17:34:35 +1000 (AEST) Received: from localhost ([::1]:35050 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lqWFr-00031q-LP for incoming@patchwork.ozlabs.org; Tue, 08 Jun 2021 03:34:31 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:51590) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lqWFI-000314-Eb for qemu-devel@nongnu.org; Tue, 08 Jun 2021 03:33:56 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:56724) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lqWFF-00052A-Hy for qemu-devel@nongnu.org; Tue, 08 Jun 2021 03:33:55 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1623137630; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=9xMxsXrpUccfJ6qL/95UHBkCQ9CcgwStSZPFtQNF/4w=; b=hBQfZAMMd0RGlz8xWJ0N2tAPwNAWqIegAAZABsVmBUwTZ9CAejW0Y3aCujsLeSzDzok+de WpIs8GE243jITySlKwOhnAJ8KwxYL7+LdBKZspIKGqZ6p56Vvckbzj4czC9ZzvmiYVWajT K6IEWje/WH9pmIcf7Ro4Be3v8D2UtVI= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-35-33GjmFS2NhuWcIsjOPKefw-1; Tue, 08 Jun 2021 03:33:49 -0400 X-MC-Unique: 33GjmFS2NhuWcIsjOPKefw-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 0A1FC19611A6; Tue, 8 Jun 2021 07:33:48 +0000 (UTC) Received: from localhost.localdomain (ovpn-113-225.ams2.redhat.com [10.36.113.225]) by smtp.corp.redhat.com (Postfix) with ESMTP id 39AA76060F; Tue, 8 Jun 2021 07:33:44 +0000 (UTC) From: Emanuele Giuseppe Esposito To: qemu-block@nongnu.org Subject: [PATCH v3 0/5] block-copy: protect block-copy internal structures Date: Tue, 8 Jun 2021 09:33:39 +0200 Message-Id: <20210608073344.53637-1-eesposit@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=eesposit@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=216.205.24.124; envelope-from=eesposit@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -29 X-Spam_score: -3.0 X-Spam_bar: --- X-Spam_report: (-3.0 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.2, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, 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: Kevin Wolf , Emanuele Giuseppe Esposito , Vladimir Sementsov-Ogievskiy , qemu-devel@nongnu.org, Max Reitz , Stefan Hajnoczi , Paolo Bonzini , John Snow Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" This serie of patches aims to reduce the usage of the AioContexlock in block-copy, by introducing smaller granularity locks thus on making the block layer thread safe. This serie depends on my previous serie that brings thread safety to the smaller API used by block-copy, like ratelimit, progressmeter abd co-shared-resource. What's missing for block-copy to be fully thread-safe is fixing the CoSleep API to allow cross-thread sleep and wakeup. Paolo is working on it. Patch 1 introduces the .method field in BlockCopyState, to be used instead of .use_copy_range, .copy_size and .zeros. Patch 2-3 provide comments and refactoring in preparation to the lock added in patch 4 on BlockCopyTask, BlockCopyCallState and BlockCopyState. Patch 5 uses load_acquire/store_release to make sure BlockCopyCallState OUT fields are updated before finished is set to true. Based-on: <20210518094058.25952-1-eesposit@redhat.com> Signed-off-by: Emanuele Giuseppe Esposito --- v3: * Use a single lock instead of two [Paolo, Vladimir] * Extend lock to protect also BdrvDirtyBitmap API [Vladimir] * Drop patch 6 (set .method as atomic) since with current refactoring it can be simply included in the near critical sections protected by the lock Emanuele Giuseppe Esposito (4): block-copy: improve comments of BlockCopyTask and BlockCopyState types and functions block-copy: move progress_set_remaining in block_copy_task_end block-copy: add a CoMutex block-copy: atomic .cancelled and .finished fields in BlockCopyCallState Paolo Bonzini (1): block-copy: streamline choice of copy_range vs. read/write block/block-copy.c | 319 +++++++++++++++++++++++++-------------------- 1 file changed, 181 insertions(+), 138 deletions(-)