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=-5.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 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 E92A4C07E9B for ; Wed, 7 Jul 2021 21:20:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CA2BF61CA2 for ; Wed, 7 Jul 2021 21:20:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232706AbhGGVWw (ORCPT ); Wed, 7 Jul 2021 17:22:52 -0400 Received: from mga11.intel.com ([192.55.52.93]:19647 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232433AbhGGVWv (ORCPT ); Wed, 7 Jul 2021 17:22:51 -0400 X-IronPort-AV: E=McAfee;i="6200,9189,10037"; a="206372563" X-IronPort-AV: E=Sophos;i="5.84,221,1620716400"; d="scan'208";a="206372563" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 Jul 2021 14:20:10 -0700 X-IronPort-AV: E=Sophos;i="5.84,221,1620716400"; d="scan'208";a="457633159" Received: from lpbeverl-mobl.amr.corp.intel.com (HELO [10.212.176.148]) ([10.212.176.148]) by orsmga008-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 Jul 2021 14:20:09 -0700 Subject: Re: [PATCH 4/4] selftests/sgx: Trigger the reclaimer and #PF handler To: Jarkko Sakkinen , Reinette Chatre Cc: Shuah Khan , linux-kselftest@vger.kernel.org, linux-sgx@vger.kernel.org, Borislav Petkov , Dave Hansen , linux-kernel@vger.kernel.org References: <20210705143652.116125-1-jarkko@kernel.org> <20210705143652.116125-5-jarkko@kernel.org> <715ed555-5044-6fee-1d09-1c4cfa827af3@intel.com> <20210706235016.uucukyrr3ckk57pi@kernel.org> <16505466-e001-c4b0-ec41-5384ddcf194b@intel.com> <20210707091736.6wzemgmtzuegk3uf@kernel.org> <10664754-7e53-d9d1-f00c-f9dbd4a2d877@intel.com> <20210707205019.6jy64s4uqcw65q4h@kernel.org> From: Dave Hansen Autocrypt: addr=dave.hansen@intel.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20210707205019.6jy64s4uqcw65q4h@kernel.org> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 7/7/21 1:50 PM, Jarkko Sakkinen wrote: > There is consistent known behaviour how reclaimer and also the page fault > are exercised for each test. I think that is what matters most right now > that the basic behaviour of both the page reclaimer and page fault handler > gets exercised. There's also a lot of value to ensuring that tests can run _quickly_. If you have a test that fails one out of a million executions, it's a lot easier find and debug if it takes 1 ms versus 10 seconds. In other words, I think I'd prefer if we run two enclaves in each execution of the selftest. One can be as small as possible. The other can be the reclaim-triggering one. That's good both for test coverage, and it makes it a *bit* more straightforward to hack out the reclaim test if you need things to run faster. The pkeys selftest isn't a bad example here either. It has a couple of different "malloc()" options: THP, hugetlbfs, small-page mmap(), and a bunch of tests it runs on each type. As we add more SGX tests, we might end up with "do reclaim" just being an option we pass.