From patchwork Mon May 3 18:07:34 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Axel Rasmussen X-Patchwork-Id: 12236741 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=-26.3 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT,USER_IN_DEF_DKIM_WL autolearn=unavailable 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 0FB47C433B4 for ; Mon, 3 May 2021 18:08:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EAFCF61283 for ; Mon, 3 May 2021 18:08:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231929AbhECSJS (ORCPT ); Mon, 3 May 2021 14:09:18 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42666 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231954AbhECSJA (ORCPT ); Mon, 3 May 2021 14:09:00 -0400 Received: from mail-yb1-xb49.google.com (mail-yb1-xb49.google.com [IPv6:2607:f8b0:4864:20::b49]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D0E47C061763 for ; Mon, 3 May 2021 11:07:56 -0700 (PDT) Received: by mail-yb1-xb49.google.com with SMTP id a3-20020a2580430000b02904f7a1a09012so4963793ybn.3 for ; Mon, 03 May 2021 11:07:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=Xac2BuhJWUqyH5WnNjzkjLemK7LFrvUwXp8Wxy1Y0Zs=; b=Dp+eYm9V8pZWxqVn9dwHTmOQieeOZFLVSfiZ0cB8hyg/Se1Z0xBe3ZybxDqks2XPjY 8UY79cMWP+Hjxb01Sw3pTvJ0KocvdaAW7w+lNbr++xYwJ3LBdxqsDvl37hdnwhLcIGkJ W901lPAsz24G6F3civKoUw7LlPZyZE85p3LpdSnc9T3I282uaYSz2ZaClGGV2NIuxODx s6C6PVVd5L6Y6Fywsuts+SizzKGyGBRgg8Bg2r5IrRM7rkaSxYjci6FH5h1vsPuNYT9G a4eaJbsGTfQJyzntteD/+XhOxllNr9eCBVCRyBiHKxy+a0MoZTknH98spga/D0k1x2a7 VbNw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=Xac2BuhJWUqyH5WnNjzkjLemK7LFrvUwXp8Wxy1Y0Zs=; b=Ho+5Z3YTJhzctn7OOVqllmNXDGG+CZzOduk+A1qeTgZE/S6d9LQdE1jtnxfxfR0jga iF9GUyBt/LolESiUguHVF3W5IeuUchAug90FxFbZaDlF6zmWfw2ehorSaV3aEwKnjsxX veDBdG3Sn2L1HKn1f6vftuzRBVUht3z/gR50DrUeIpgRqH1T3m+pWnmkuY9UgMqZamje cGwEZbUhoirZUZiFhMkWZf3SAaJgxiPVMt4H+Us1gwejQl2UEwjIHyPc6XYnoM8W3ril t0xtkOanIbJXEmxYY5xySxvY8xXF+IF5UJNhhqBEX9kx0yMeVAw6I6LOP872jGbN8TeT VX3g== X-Gm-Message-State: AOAM531I5d7IYdL+cIrq42zRlpVzXyd5fyPQ4+DloDXZp2lbhk3Ok1QF RRV6ddJC904gU4u0tI0KCW1Mv7PiDclRh3kacKbN X-Google-Smtp-Source: ABdhPJx+jXbiz0zAjVjFU2FT4iWpi3DJuyrx4MPp0buQPJJtAqRHzn6LRuVX4gpKOL6VG9z3xIXvY7lqv2L1UxWsKKT+ X-Received: from ajr0.svl.corp.google.com ([2620:15c:2cd:203:3d79:e69a:a4f9:ef0]) (user=axelrasmussen job=sendgmr) by 2002:a05:6902:4ab:: with SMTP id r11mr29737692ybs.70.1620065276077; Mon, 03 May 2021 11:07:56 -0700 (PDT) Date: Mon, 3 May 2021 11:07:34 -0700 In-Reply-To: <20210503180737.2487560-1-axelrasmussen@google.com> Message-Id: <20210503180737.2487560-8-axelrasmussen@google.com> Mime-Version: 1.0 References: <20210503180737.2487560-1-axelrasmussen@google.com> X-Mailer: git-send-email 2.31.1.527.g47e6f16901-goog Subject: [PATCH v6 07/10] userfaultfd/selftests: use memfd_create for shmem test type From: Axel Rasmussen To: Alexander Viro , Andrea Arcangeli , Andrew Morton , Hugh Dickins , Jerome Glisse , Joe Perches , Lokesh Gidra , Mike Kravetz , Mike Rapoport , Peter Xu , Shaohua Li , Shuah Khan , Stephen Rothwell , Wang Qing Cc: linux-api@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org, Axel Rasmussen , Brian Geffon , "Dr . David Alan Gilbert" , Mina Almasry , Oliver Upton Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org This is a preparatory commit. In the future, we want to be able to setup alias mappings for area_src and area_dst in the shmem test, like we do in the hugetlb_shared test. With a VMA obtained via mmap(MAP_ANONYMOUS | MAP_SHARED), it isn't clear how to do this. So, mmap() with an fd, so we can create alias mappings. Use memfd_create instead of actually passing in a tmpfs path like hugetlb does, since it's more convenient / simpler to run, and works just as well. Future commits will: 1. Setup the alias mappings. 2. Extend our tests to actually take advantage of this, to test new userfaultfd behavior being introduced in this series. Also, a small fix in the area we're changing: when the hugetlb setup fails in main(), pass in the right argv[] so we actually print out the hugetlb file path. Reviewed-by: Peter Xu Signed-off-by: Axel Rasmussen --- tools/testing/selftests/vm/userfaultfd.c | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/vm/userfaultfd.c b/tools/testing/selftests/vm/userfaultfd.c index 6339aeaeeff8..fc40831f818f 100644 --- a/tools/testing/selftests/vm/userfaultfd.c +++ b/tools/testing/selftests/vm/userfaultfd.c @@ -85,6 +85,7 @@ static bool test_uffdio_wp = false; static bool test_uffdio_minor = false; static bool map_shared; +static int shm_fd; static int huge_fd; static char *huge_fd_off0; static unsigned long long *count_verify; @@ -277,8 +278,11 @@ static void shmem_release_pages(char *rel_area) static void shmem_allocate_area(void **alloc_area) { + unsigned long offset = + alloc_area == (void **)&area_src ? 0 : nr_pages * page_size; + *alloc_area = mmap(NULL, nr_pages * page_size, PROT_READ | PROT_WRITE, - MAP_ANONYMOUS | MAP_SHARED, -1, 0); + MAP_SHARED, shm_fd, offset); if (*alloc_area == MAP_FAILED) err("mmap of memfd failed"); } @@ -1448,6 +1452,16 @@ int main(int argc, char **argv) err("Open of %s failed", argv[4]); if (ftruncate(huge_fd, 0)) err("ftruncate %s to size 0 failed", argv[4]); + } else if (test_type == TEST_SHMEM) { + shm_fd = memfd_create(argv[0], 0); + if (shm_fd < 0) + err("memfd_create"); + if (ftruncate(shm_fd, nr_pages * page_size * 2)) + err("ftruncate"); + if (fallocate(shm_fd, + FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE, 0, + nr_pages * page_size * 2)) + err("fallocate"); } printf("nr_pages: %lu, nr_pages_per_cpu: %lu\n", nr_pages, nr_pages_per_cpu);