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 X-Spam-Level: X-Spam-Status: No, score=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6ADFAC433FF for ; Wed, 14 Aug 2019 08:41:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4CA722083B for ; Wed, 14 Aug 2019 08:41:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727276AbfHNIlf (ORCPT ); Wed, 14 Aug 2019 04:41:35 -0400 Received: from mx1.redhat.com ([209.132.183.28]:49752 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725928AbfHNIle (ORCPT ); Wed, 14 Aug 2019 04:41:34 -0400 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 608DE46671; Wed, 14 Aug 2019 08:41:34 +0000 (UTC) Received: from localhost (ovpn-8-16.pek2.redhat.com [10.72.8.16]) by smtp.corp.redhat.com (Postfix) with ESMTP id 4A8EB19C68; Wed, 14 Aug 2019 08:41:31 +0000 (UTC) From: Ming Lei To: Thomas Gleixner Cc: linux-kernel@vger.kernel.org, Ming Lei , Jens Axboe , Christoph Hellwig , Keith Busch , linux-nvme@lists.infradead.org, Jon Derrick Subject: [PATCH V4 0/3] genriq/affinity: Make vectors allocation fair Date: Wed, 14 Aug 2019 16:40:41 +0800 Message-Id: <20190814084044.21699-1-ming.lei@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.30]); Wed, 14 Aug 2019 08:41:34 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, The 1st patch enhances one warning check. The 2nd patch makes __irq_build_affinity_masks() more reliable, such as, all nodes can be covered in the spread. The 3rd patch spread vectors on node according to the ratio of this node's CPU number to number of all remaining CPUs, then vectors assignment can become more fair. Meantime, the warning report from Jon Derrick can be fixed. Please review & comment! V4: - provide proof why number of allocated vectors for each node is <= CPU count of this node V3: - re-order the patchset - add helper of irq_spread_vectors_on_node() - handle vector spread correctly in case that numvecs is > ncpus - return -ENOMEM to API's caller V2: - add patch3 - start to allocate vectors from node with minimized CPU number, then every node is guaranteed to be allocated at least one vector. - avoid cross node spread Ming Lei (3): genirq/affinity: Enhance warning check genirq/affinity: Improve __irq_build_affinity_masks() genirq/affinity: Spread vectors on node according to nr_cpu ratio kernel/irq/affinity.c | 243 ++++++++++++++++++++++++++++++++++++------ 1 file changed, 209 insertions(+), 34 deletions(-) Cc: Jens Axboe Cc: Christoph Hellwig Cc: Keith Busch Cc: linux-nvme@lists.infradead.org, Cc: Jon Derrick -- 2.20.1