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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0B470C433F5 for ; Tue, 28 Sep 2021 13:43:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E21E460FF2 for ; Tue, 28 Sep 2021 13:43:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240632AbhI1Nph (ORCPT ); Tue, 28 Sep 2021 09:45:37 -0400 Received: from mail.kernel.org ([198.145.29.99]:49170 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233878AbhI1Nph (ORCPT ); Tue, 28 Sep 2021 09:45:37 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 1E50B60FE8; Tue, 28 Sep 2021 13:43:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1632836637; bh=cs5n98qHfQZYLy19Er8FYJReHQtg5Zp1lA6UsfoorMQ=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=S20gXJdb+xfcew7LZYB2dAiUCXsLj60iH9XYu6a6GOb/kezOEd/+/VuQAn9zl6p6F U5V7pX62IKg5uG+jCb1IfZhA3qo7BGnCVBJyanEjd4BSA6dueCjtSvfyzf6ink4Vtd R+kblBnMJE/rf1W19/FnLbq4afzgfgdoph0bdsgHbALMiG6HHQtXal8s8NQnYn1Wfu Wzop9l2ub9Db92hUTSR8FqnRphl6uqNY/tdIBilJzatJkxkFj2JFQeT7+m7ixdhn/2 AmRbvjA/Ss0xOxogeyPYSsRAnWQnB2AvszpUESuw+bjMW06cUQefULWU2LVqIicEzM oICAm0DV0uKCQ== Date: Tue, 28 Sep 2021 15:43:53 +0200 From: Mauro Carvalho Chehab To: Greg Kroah-Hartman Cc: Linux Doc Mailing List , linux-kernel@vger.kernel.org, Jonathan Corbet Subject: Re: [PATCH 0/3] get_abi: improve message output and fix a regression Message-ID: <20210928154353.2e6656bb@coco.lan> In-Reply-To: <20210928142739.2ffe380b@coco.lan> References: <20210928142739.2ffe380b@coco.lan> X-Mailer: Claws Mail 4.0.0 (GTK+ 3.24.30; x86_64-redhat-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org Em Tue, 28 Sep 2021 14:27:39 +0200 Mauro Carvalho Chehab escreveu: > Em Tue, 28 Sep 2021 13:04:22 +0200 > Greg Kroah-Hartman escreveu: > > > On Tue, Sep 28, 2021 at 12:14:01PM +0200, Mauro Carvalho Chehab wrote: > > > Hi Greg, > > > > > > As promised on > > > > > > https://lore.kernel.org/lkml/20210928120304.62319fba@coco.lan/T/#u > > > > > > I'm adding progress info when get_abi.pl is checking for undefined ABI symbols > > > on patches 1 and 2. > > > > > > That will help not only to identify what is causing delays on the script, but also > > > to notify the user that processing it could take some time on some systems. > > > > > > If you run it on your big server with: > > > > > > scripts/get_abi.pl undefined 2>logs > > > > > > The "logs" file will contain timestamps relative to the time the script started to > > > do the regex matches for sysfs files. It should be printing one line every > > > time the progress completes 1% or one second after the last progress output. > > > > Adding more debugging and tweaking the script a bit to show the file it > > is about to check, not the one it finished checking, > > Feel free to modify the script and add such debug/tweaks if you find > it useful. > > > I got the following > > debug output that seems to pinpoint the problem file. > > > > The sysfs file that is causing problems is: > > /sys/devices/pci0000:40/0000:40:00.2/iommu/ivhd1/amd-iommu/cap > > > > Btw, I just got an arm64 server with 128 CPUs for testing. I'm trying > to allocate also a big x86 server here, but I'm not sure if it is AMD or > Intel. Some tests on a Gigabyte R182-Z91-00 server, equipped with AMD EPYC 7352 24-Core Processors (total 96 threads): $ find /sys |wc -l 233981 $ time ./scripts/get_abi.pl undefined >undefined 2>logs real 0m38.917s user 0m34.554s sys 0m4.292s PS.: this machine doesn't have anything at /sys/class/iommu. On a Huawei TaiShan 200 (Model 2280) with 128 ARM cores: $ find /sys |wc -l 99362 $ time ./scripts/get_abi.pl undefined >undefined 2>logs real 0m29.311s user 0m26.173s sys 0m3.061s Both machines are using Perl 5.26. Thanks, Mauro