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 CD1AFC61DE4 for ; Tue, 1 Sep 2026 05:18:42 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists1p.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1x1GtJ-0001al-QW; Tue, 01 Sep 2026 01:18:37 -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 1x1GtI-0001aa-5K for qemu-devel@nongnu.org; Tue, 01 Sep 2026 01:18:36 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1x1GtF-00048i-FR for qemu-devel@nongnu.org; Tue, 01 Sep 2026 01:18:35 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1788239911; 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: in-reply-to:in-reply-to:references:references; bh=XkvAJuS3lc53RZkS/IVBzLs2pJHL1lLOC9e1pmunPUM=; b=a/k+nWtfs0/yWhfXV2IKspZAOyAr8jSYHNlE7Dbqfmt50IctFehpx3uB1IAT5Jd3wvSvvJ RHBYlF0BjV3cHGE/m0bXlE/jmDSkpLzZdoqs8mZqyCh8WHvp/V9igQBvFYiCJywEyOy0Jp lNJoHBc7xEMAwEx6ehMAwdVKFsfy5EY= Received: from mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-615-A-Y7lFiBPd6zs3oBqSDuUg-1; Tue, 01 Sept 2026 01:18:18 -0400 X-MC-Unique: A-Y7lFiBPd6zs3oBqSDuUg-1 X-Mimecast-MFC-AGG-ID: A-Y7lFiBPd6zs3oBqSDuUg_1788239897 Received: from mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.111]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id E3F5B1944DCD; Tue, 1 Sep 2026 05:18:16 +0000 (UTC) Received: from blackfin.pond.sub.org (unknown [10.44.22.5]) by mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 8892D1800640; Tue, 1 Sep 2026 05:18:16 +0000 (UTC) Received: by blackfin.pond.sub.org (Postfix, from userid 1000) id 2823C21E6832; Tue, 01 Sep 2026 07:18:14 +0200 (CEST) From: Markus Armbruster To: Zhang Chen Cc: qemu-devel , Eric Blake , "'Michael S . Tsirkin'" , Stefan Hajnoczi , Paolo Bonzini , 'Daniel P . =?utf-8?Q?Berrang=C3=A9'?= , Jason Wang Subject: Re: [PATCH V14 03/15] iothread: add holder-aware AioContext accessors In-Reply-To: <20260831160038.221776-4-zhangckid@gmail.com> (Zhang Chen's message of "Tue, 1 Sep 2026 00:00:24 +0800") References: <20260831160038.221776-1-zhangckid@gmail.com> <20260831160038.221776-4-zhangckid@gmail.com> Date: Tue, 01 Sep 2026 07:18:14 +0200 Message-ID: <87fqztbld5.fsf@pond.sub.org> User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.111 Received-SPF: pass client-ip=170.10.129.124; envelope-from=armbru@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: 12 X-Spam_score: 1.2 X-Spam_bar: + X-Spam_report: (1.2 / 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, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=0.001, RCVD_IN_SBL_CSS=3.335, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 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 Zhang Chen writes: > Introduce iothread_ref_and_get_aio_context() with a holder argument > and its counterpart iothread_unref_and_put_aio_context(). > > Previously, users of an IOThread AioContext did not explicitly record > their identity, making it difficult to debug which devices or > subsystems were pinning an IOThread. These new helpers provide the > infrastructure for callers to register their identity. Subsequent > patches convert existing users to the new helpers. > > Registering a holder takes an IOThread object reference so that the > IOThread and its AioContext stay alive until the matching put > operation. Document the ownership and BQL requirements. > > Reviewed-by: Stefan Hajnoczi > Signed-off-by: Zhang Chen Reviewed-by: Markus Armbruster