From patchwork Mon Jul 6 14:15:56 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Marchand X-Patchwork-Id: 73251 Return-Path: X-Original-To: patchwork@inbox.dpdk.org Delivered-To: patchwork@inbox.dpdk.org Received: from dpdk.org (dpdk.org [92.243.14.124]) by inbox.dpdk.org (Postfix) with ESMTP id D0830A00C5; Mon, 6 Jul 2020 16:16:31 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 2C97D1D908; Mon, 6 Jul 2020 16:16:31 +0200 (CEST) Received: from us-smtp-delivery-1.mimecast.com (us-smtp-1.mimecast.com [207.211.31.81]) by dpdk.org (Postfix) with ESMTP id 73F191D8E4 for ; Mon, 6 Jul 2020 16:16:29 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1594044988; 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: in-reply-to:in-reply-to:references:references; bh=c4SzH4lfUdl4RXj4Uh5L6MLZWLxCTVOJReyEMtkjP1g=; b=c+lfztEZWfONXNlyaBrVpp/M6xxEsxgcfRo0Lfw/Oc/t1OLJ1+OvzcSQFsdtaZMI2Wc8+T HRf0zqM/HNOBldMGjEC21tMcdvd2t29b5pLEFUkIHyZuvET99/LGPUbYycNo4wzq0OI0dK 4vEUP716jEdIvp3oYINNe0Ns1/GI0II= 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-391-HCfCRS3OO-iRO7OvVb9rZA-1; Mon, 06 Jul 2020 10:16:20 -0400 X-MC-Unique: HCfCRS3OO-iRO7OvVb9rZA-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 55CAD106B245; Mon, 6 Jul 2020 14:16:18 +0000 (UTC) Received: from dmarchan.remote.csb (unknown [10.40.195.188]) by smtp.corp.redhat.com (Postfix) with ESMTP id 56AEF5C241; Mon, 6 Jul 2020 14:16:14 +0000 (UTC) From: David Marchand To: dev@dpdk.org Cc: jerinjacobk@gmail.com, bruce.richardson@intel.com, mdr@ashroe.eu, thomas@monjalon.net, arybchenko@solarflare.com, ktraynor@redhat.com, ian.stokes@intel.com, i.maximets@ovn.org, olivier.matz@6wind.com, konstantin.ananyev@intel.com Date: Mon, 6 Jul 2020 16:15:56 +0200 Message-Id: <20200706141606.32134-1-david.marchand@redhat.com> In-Reply-To: <20200610144506.30505-1-david.marchand@redhat.com> References: <20200610144506.30505-1-david.marchand@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=david.marchand@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Subject: [dpdk-dev] [PATCH v5 00/10] Register non-EAL threads as lcore X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" OVS and some other applications have been hacking into DPDK internals to fake EAL threads and avoid performance penalty of only having non-EAL threads. This series proposes to add a new type of lcores and maps those threads to such lcores. non-EAL threads won't run the DPDK eal mainloop. As a consequence, part of the EAL threads API cannot work. Having new lcores appearing during the process lifetime is not expected by some DPDK components. This is addressed by introducing init/uninit callacks invoked when hotplugging of such lcore. There is still some work/discussion: - refuse new lcore role in incompatible EAL threads API (or document it only as those API were already incompatible?), - think about deprecation notices for existing RTE_FOREACH_LCORE macros and consorts, it is probably worth discussing on how to iterate over lcores, For the interested parties, I have a patch [1] against dpdk-latest OVS branch that makes use of this series (this patch probably won't work with v5, it will be rebased once dpdk side is ready). 1: https://patchwork.ozlabs.org/project/openvswitch/patch/20200626123017.28555-1-david.marchand@redhat.com/ Changes since v4: - added separate API to control mp feature activation, - addressed Konstantin and Olivier comments, Changes since v3: - added init failure when trying to use in conjunction with multiprocess, - addressed Andrew comments, Changes since v2: - fixed windows build error due to missing trace stub, - fixed bug when rolling back on lcore register, Changes since v1: - rebased on master (conflicts on merged Windows series), - separated lcore role code cleanup in a patch, - tried to use a single naming, so kept non-EAL threads as the main notion. non-EAL threads are then distinguished between registered and unregistered non-EAL threads, - added unit tests (still missing some coverage, marked with a FIXME), - reworked callbacks call under a common rwlock lock which protects lcores allocations and callbacks registration, - introduced lcore iterators and converted the bucket mempool driver,