From patchwork Sat Mar 7 03:40:45 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Prakhya, Sai Praneeth" X-Patchwork-Id: 11425097 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 16DAE924 for ; Sat, 7 Mar 2020 03:46:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EBAB42075E for ; Sat, 7 Mar 2020 03:46:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727059AbgCGDqP (ORCPT ); Fri, 6 Mar 2020 22:46:15 -0500 Received: from mga11.intel.com ([192.55.52.93]:57577 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727052AbgCGDqP (ORCPT ); Fri, 6 Mar 2020 22:46:15 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by fmsmga102.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 06 Mar 2020 19:46:15 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.70,524,1574150400"; d="scan'208";a="235036005" Received: from sai-dev-mach.sc.intel.com ([143.183.140.153]) by fmsmga008.fm.intel.com with ESMTP; 06 Mar 2020 19:46:15 -0800 From: Sai Praneeth Prakhya To: shuah@kernel.org, linux-kselftest@vger.kernel.org Cc: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, tony.luck@intel.com, reinette.chatre@intel.com, babu.moger@amd.com, james.morse@arm.com, ravi.v.shankar@intel.com, fenghua.yu@intel.com, x86@kernel.org, linux-kernel@vger.kernel.org, Sai Praneeth Prakhya Subject: [PATCH V1 04/13] selftests/resctrl: Ensure sibling CPU is not same as original CPU Date: Fri, 6 Mar 2020 19:40:45 -0800 Message-Id: X-Mailer: git-send-email 2.19.1 In-Reply-To: References: MIME-Version: 1.0 Sender: linux-kselftest-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org From: Reinette Chatre The resctrl tests can accept a CPU on which the tests are run and use default of CPU #1 if it is not provided. In the CAT test a "sibling CPU" is determined that is from the same package where another thread will be run. The current algorithm with which a "sibling CPU" is determined does not take the provided/default CPU into account and when that CPU is the first CPU in a package then the "sibling CPU" will be selected to be the same CPU since it starts by picking the first CPU from core_siblings_list. Fix the "sibling CPU" selection by taking the provided/default CPU into account and ensuring a sibling that is a different CPU is selected. Signed-off-by: Reinette Chatre Signed-off-by: Sai Praneeth Prakhya --- tools/testing/selftests/resctrl/resctrlfs.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/testing/selftests/resctrl/resctrlfs.c b/tools/testing/selftests/resctrl/resctrlfs.c index 226dd7fdcfb1..465faaad3239 100644 --- a/tools/testing/selftests/resctrl/resctrlfs.c +++ b/tools/testing/selftests/resctrl/resctrlfs.c @@ -268,7 +268,7 @@ int get_core_sibling(int cpu_no) while (token) { sibling_cpu_no = atoi(token); /* Skipping core 0 as we don't want to run test on core 0 */ - if (sibling_cpu_no != 0) + if (sibling_cpu_no != 0 && sibling_cpu_no != cpu_no) break; token = strtok(NULL, "-,"); }