From patchwork Tue Apr 27 22:52:41 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Axel Rasmussen X-Patchwork-Id: 12227703 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 B4300C433B4 for ; Tue, 27 Apr 2021 22:54:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 797F36100B for ; Tue, 27 Apr 2021 22:54:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239075AbhD0Wyt (ORCPT ); Tue, 27 Apr 2021 18:54:49 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53776 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239425AbhD0Wxq (ORCPT ); Tue, 27 Apr 2021 18:53:46 -0400 Received: from mail-qt1-x849.google.com (mail-qt1-x849.google.com [IPv6:2607:f8b0:4864:20::849]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1DE8EC061345 for ; Tue, 27 Apr 2021 15:53:02 -0700 (PDT) Received: by mail-qt1-x849.google.com with SMTP id i7-20020ac84f470000b02901b944d49e13so16438430qtw.7 for ; Tue, 27 Apr 2021 15:53:02 -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=u1gk9aiwDmv6+SRZ0ft4k2Rli22/pgCpQ8yAo+qVnNA=; b=WhttcOh6OlYlGtQYO3hqYvxXeiYuKV+rWQSt5GADJGax/zVklA+4aVWY6Vth1HSH3X jwqi4xlCmJmF2uk4C3mUlO9dXP5GKLMafa/YYpnFpCz7vDawNizmXlGB6yjOLRbWnnjs zUKKD0pPXPMq+GNf9mgcyCiC+JYB1W0gdtCctKXlHEeJk0mX+xU28z2b6gRtk8Yu85nl 2JjUUN+ND3iO+ubDxIVQYc87lZwqiydAQ90ZMWi5SimqntNNm/EZWf8oo0PfH30L05ai eXKCJjGA7iP4ZQy64cNZRCZh9nqI8vq5hUhkIc2nfyfHUBlBdiVJlltPIDFueWEmrOik S4mw== 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=u1gk9aiwDmv6+SRZ0ft4k2Rli22/pgCpQ8yAo+qVnNA=; b=lD7BndSBAXLFqPAR11KWNOJn4kwhhoGbSf9VCMRp1xXDoz9QrvCOPou05YhDAk7KcH /EJXPPA1/2G7kckEeAr3d9iiFBKrkMvhnFSGjVA7APsaOe6rJ4SSGfhFGEikqlOOY63b fk0inGZikMsMnstgkzlYo/82EPI0bHhYCCF8oeZ9UVyL7M3GaL9iC/5oC4c94XvbAZU3 HNoG82bXtaiSk9XHqdgx/4XMrsdpy9IcfMghlvJCBkNMWavp3760BafBVchH8VaOOqB7 CI2diQ31PZHZsDXj+L5xdko9IK8r3804SnjLmUeZHp45ZRINARoDsQzYC2d109LArk6C f02w== X-Gm-Message-State: AOAM532qlUi9DkK8Z3LnCAmENO0OmkHU3zjN1S93ina7LsFMD7FByJJw axdrhsTWr/zBmpBltgckfALx3F25xuv7/U0R+3oD X-Google-Smtp-Source: ABdhPJwiDFSleswhpJEUOz8lD3obBc43FvS6xslLfDjp1Gi5RYfDgRHiZ7zkrRDES+WQD/M44l98muWb/GGEwvLSrFN1 X-Received: from ajr0.svl.corp.google.com ([2620:15c:2cd:203:c423:570b:b823:c33e]) (user=axelrasmussen job=sendgmr) by 2002:a0c:fcc8:: with SMTP id i8mr14211207qvq.31.1619563981243; Tue, 27 Apr 2021 15:53:01 -0700 (PDT) Date: Tue, 27 Apr 2021 15:52:41 -0700 In-Reply-To: <20210427225244.4326-1-axelrasmussen@google.com> Message-Id: <20210427225244.4326-8-axelrasmussen@google.com> Mime-Version: 1.0 References: <20210427225244.4326-1-axelrasmussen@google.com> X-Mailer: git-send-email 2.31.1.498.g6c1eba8ee3d-goog Subject: [PATCH v5 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);