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bh=uZDhdt+CeYVFLVv1fRlDfeIiX/EtafnDIoKUIITQJRE=; b=eGNmCWYt2OahZVuuhLs+RdqR1GGGMlb+YHfuZvoeboAv1Oun2osysCfIzQvaR5RUzA5cRa BVXlJ4E4106Nmwo8vdzrJW93moM1/sjwFLq7yvRx70Eby7S2voSHt63Kz2uwsgiWi05LVj uczn9mGeeC/H9aMnPwEXl3kxkxSuRs4= 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-226-XcU91Td9MqeTI8CMMaAo_A-1; Wed, 24 Mar 2021 10:26:44 -0400 X-MC-Unique: XcU91Td9MqeTI8CMMaAo_A-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 68D98185304D; Wed, 24 Mar 2021 14:26:08 +0000 (UTC) Received: from dresden.str.redhat.com (ovpn-113-161.ams2.redhat.com [10.36.113.161]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 8F5BB5D767; Wed, 24 Mar 2021 14:26:01 +0000 (UTC) Subject: Re: [PATCH v5 0/6] coroutine rwlock downgrade fix, minor VDI changes To: Paolo Bonzini , qemu-devel@nongnu.org, Stefan Hajnoczi References: <20210317180013.235231-1-pbonzini@redhat.com> From: Max Reitz Message-ID: <712353c7-ee20-6dc7-b001-903de9d6e4f3@redhat.com> Date: Wed, 24 Mar 2021 15:26:00 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.8.0 MIME-Version: 1.0 In-Reply-To: <20210317180013.235231-1-pbonzini@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=mreitz@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=170.10.133.124; envelope-from=mreitz@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, NICE_REPLY_A=-0.001, 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: david.edmondson@oracle.com, kwolf@redhat.com, qemu-block@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 17.03.21 19:00, Paolo Bonzini wrote: > This is a resubmit of David Edmondson's series at > https://patchew.org/QEMU/20210309144015.557477-1-david.edmondson@oracle.com/. > After closer analysis on IRC, the CoRwlock's attempt to ensure > fairness turned out to be flawed. Therefore, this series > reimplements CoRwlock without using a CoQueue. Tracking whether > each queued coroutine is a reader/writer makes it possible to > never wake a writer when only readers should be allowed and > vice versa. I’m not a maintainer for patches 3 through 6. Stefan is, though. So Stefan, can you take this series with an R-b from me on 1 and 2? Max