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 7888DC2BB1D for ; Wed, 11 Mar 2020 18:27:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 34E292072F for ; Wed, 11 Mar 2020 18:27:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730836AbgCKS1p (ORCPT ); Wed, 11 Mar 2020 14:27:45 -0400 Received: from mga07.intel.com ([134.134.136.100]:25702 "EHLO mga07.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730468AbgCKS1p (ORCPT ); Wed, 11 Mar 2020 14:27:45 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by orsmga105.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 11 Mar 2020 11:27:44 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.70,541,1574150400"; d="scan'208";a="236370876" Received: from sai-dev-mach.sc.intel.com ([143.183.140.153]) by fmsmga008.fm.intel.com with ESMTP; 11 Mar 2020 11:27:44 -0700 Message-ID: <664cf142449b0a1ef7f09d04111f96ff84738e28.camel@intel.com> Subject: Re: [PATCH V1 01/13] selftests/resctrl: Fix feature detection From: Sai Praneeth Prakhya To: Reinette Chatre , "shuah@kernel.org" , "linux-kselftest@vger.kernel.org" Cc: "tglx@linutronix.de" , "mingo@redhat.com" , "bp@alien8.de" , "Luck, Tony" , "babu.moger@amd.com" , "james.morse@arm.com" , "Shankar, Ravi V" , "Yu, Fenghua" , "x86@kernel.org" , "linux-kernel@vger.kernel.org" Date: Wed, 11 Mar 2020 11:22:57 -0700 In-Reply-To: References: <7e3e4b91f5786a489e68eecda21e1d8049b60181.1583657204.git.sai.praneeth.prakhya@intel.com> Content-Type: text/plain; charset="UTF-8" User-Agent: Evolution 3.30.5-0ubuntu0.18.10.1 MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Reinette, On Wed, 2020-03-11 at 11:06 -0700, Reinette Chatre wrote: > Hi Sai, > > On 3/9/2020 3:51 PM, Prakhya, Sai Praneeth wrote: > > > -----Original Message----- > > > From: Reinette Chatre > > > Sent: Monday, March 9, 2020 3:34 PM > > > > [SNIP] > > > > > > That's a good point and makes sense to me. I think we could fix it in > > > > two ways 1. grep for strings in dmesg but that will still leave > > > > ambiguity in deciding b/w mbm and cqm because kernel prints "resctrl: > > > > L3 > > > monitoring detected" for both the features 2. Check in "info" directory > > > > a. For cat_l3, we could search for info/L3 > > > > b. For mba, we could search for info/MB > > > > c. For cqm and mbm, we could search for specified string in > > > > info/L3_MON/mon_features > > > > > > > > I think option 2 might be better because it can handle all cases, > > > > please let me > > > know what you think. > > > > > > I agree. For the reasons you mention and also that (1) may not be > > > possible if the > > > loglevel prevents those lines from being printed. > > > > Makes sense. I will work on the fix. > > One more note about this ... from what I can tell the test for a feature > currently fails if the platform does not support the feature. Would it > be possible to just skip the test in this case instead? That's because the output of the test should be just "ok" or "not ok". I can change it to something like "# Skip because platform doesn't support the feature", but not really sure if it complies with TAP 13 protocol. Regards, Sai