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=-3.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT 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 564C5C3A5A2 for ; Tue, 3 Sep 2019 08:02:15 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 2B75422CF8 for ; Tue, 3 Sep 2019 08:02:15 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="Q+iJPJ99" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2B75422CF8 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:Message-Id:Date: Subject:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To: References:List-Owner; bh=x7pmpY+6qgLi6HXYo/QTPPInMfsQfz+EkaDnMPM4yVU=; b=Q+i JPJ99ySKnlSW98eAlYdJZs5YLgJ/MU18DnLfmSYYCkOFhWUJj1YeSsxtPzWI5VPctgA3/nQV9yPro 9hjoV961f0PwKY/onC4cTQzruU6kgVB52R4zzc+sVnCuK5QroJKQApqhSt9z5ox72vZ18Hh6v1uqK ItMgBi7KKZCADcFvkdy8W16ncJC9FT4RbnO0YlSn1hBAt8yA6nqbjvr/a4/bEgvMsTWsoIYcURDjp cp0yMeeM7jor/45vBRYeydRE2zasB7l4B37robsDRYFtmM3ycUL75QFqjBuBfcSE44RIkXLbLf7BU n+UAwo+HebPhR5Ln65D8Gef8s/n9jhw==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1i53lR-0003Rl-MG; Tue, 03 Sep 2019 08:02:09 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1i53lO-0003Qc-6t; Tue, 03 Sep 2019 08:02:08 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 3B2FD344; Tue, 3 Sep 2019 01:02:03 -0700 (PDT) Received: from p8cg001049571a15.blr.arm.com (p8cg001049571a15.blr.arm.com [10.162.42.170]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 312113F246; Tue, 3 Sep 2019 01:01:52 -0700 (PDT) From: Anshuman Khandual To: linux-mm@kvack.org Subject: [PATCH 0/1] mm/debug: Add tests for architecture exported page table helpers Date: Tue, 3 Sep 2019 13:31:45 +0530 Message-Id: <1567497706-8649-1-git-send-email-anshuman.khandual@arm.com> X-Mailer: git-send-email 2.7.4 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190903_010206_341896_94579FD0 X-CRM114-Status: GOOD ( 15.68 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , linux-ia64@vger.kernel.org, linux-sh@vger.kernel.org, Peter Zijlstra , James Hogan , Tetsuo Handa , Heiko Carstens , Michal Hocko , Dave Hansen , Paul Mackerras , sparclinux@vger.kernel.org, Thomas Gleixner , linux-s390@vger.kernel.org, Michael Ellerman , x86@kernel.org, Russell King - ARM Linux , Matthew Wilcox , Steven Price , Jason Gunthorpe , linux-arm-kernel@lists.infradead.org, linux-snps-arc@lists.infradead.org, Kees Cook , Anshuman Khandual , Masahiro Yamada , Mark Brown , Dan Williams , Vlastimil Babka , Sri Krishna chowdary , Ard Biesheuvel , Greg Kroah-Hartman , linux-mips@vger.kernel.org, Ralf Baechle , linux-kernel@vger.kernel.org, Paul Burton , Mike Rapoport , Vineet Gupta , Martin Schwidefsky , Andrew Morton , linuxppc-dev@lists.ozlabs.org, "David S. Miller" MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org This series adds a test validation for architecture exported page table helpers. Patch in the series adds basic transformation tests at various levels of the page table. This test was originally suggested by Catalin during arm64 THP migration RFC discussion earlier. Going forward it can include more specific tests with respect to various generic MM functions like THP, HugeTLB etc and platform specific tests. https://lore.kernel.org/linux-mm/20190628102003.GA56463@arrakis.emea.arm.com/ Questions: Should alloc_gigantic_page() be made available as an interface for general use in the kernel. The test module here uses very similar implementation from HugeTLB to allocate a PUD aligned memory block. Similar for mm_alloc() which needs to be exported through a header. Matthew Wilcox had expressed concerns regarding memory allocation for mapped page table entries at various level. He also suggested using synethetic pfns which can be derived from virtual address of a known kernel text symbol like kernel_init(). But as discussed previously, it seems like allocated memory might still outweigh synthetic pfns. This proposal goes with allocated memory but if there is a broader agreement with respect to synthetic pfns, will be happy to rework the test. Testing: Build and boot tested on arm64 and x86 platforms. While arm64 clears all these tests, following errors were reported on x86. 1. WARN_ON(pud_bad(pud)) in pud_populate_tests() 2. WARN_ON(p4d_bad(p4d)) in p4d_populate_tests() I would really appreciate if folks can help validate this test on other platforms and report back problems if any. Suggestions, comments and inputs welcome. Thank you. Changes in V3: - Added fallback mechanism for PMD aligned memory allocation failure Changes in V2: https://lore.kernel.org/linux-mm/1565335998-22553-1-git-send-email-anshuman.khandual@arm.com/T/#u - Moved test module and it's config from lib/ to mm/ - Renamed config TEST_ARCH_PGTABLE as DEBUG_ARCH_PGTABLE_TEST - Renamed file from test_arch_pgtable.c to arch_pgtable_test.c - Added relevant MODULE_DESCRIPTION() and MODULE_AUTHOR() details - Dropped loadable module config option - Basic tests now use memory blocks with required size and alignment - PUD aligned memory block gets allocated with alloc_contig_range() - If PUD aligned memory could not be allocated it falls back on PMD aligned memory block from page allocator and pud_* tests are skipped - Clear and populate tests now operate on real in memory page table entries - Dummy mm_struct gets allocated with mm_alloc() - Dummy page table entries get allocated with [pud|pmd|pte]_alloc_[map]() - Simplified [p4d|pgd]_basic_tests(), now has random values in the entries RFC V1: https://lore.kernel.org/linux-mm/1564037723-26676-1-git-send-email-anshuman.khandual@arm.com/ Cc: Andrew Morton Cc: Vlastimil Babka Cc: Greg Kroah-Hartman Cc: Thomas Gleixner Cc: Mike Rapoport Cc: Jason Gunthorpe Cc: Dan Williams Cc: Peter Zijlstra Cc: Michal Hocko Cc: Mark Rutland Cc: Mark Brown Cc: Steven Price Cc: Ard Biesheuvel Cc: Masahiro Yamada Cc: Kees Cook Cc: Tetsuo Handa Cc: Matthew Wilcox Cc: Sri Krishna chowdary Cc: Dave Hansen Cc: Russell King - ARM Linux Cc: Michael Ellerman Cc: Paul Mackerras Cc: Martin Schwidefsky Cc: Heiko Carstens Cc: "David S. Miller" Cc: Vineet Gupta Cc: James Hogan Cc: Paul Burton Cc: Ralf Baechle Cc: linux-snps-arc@lists.infradead.org Cc: linux-mips@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-ia64@vger.kernel.org Cc: linuxppc-dev@lists.ozlabs.org Cc: linux-s390@vger.kernel.org Cc: linux-sh@vger.kernel.org Cc: sparclinux@vger.kernel.org Cc: x86@kernel.org Cc: linux-kernel@vger.kernel.org Anshuman Khandual (1): mm/pgtable/debug: Add test validating architecture page table helpers mm/Kconfig.debug | 14 ++ mm/Makefile | 1 + mm/arch_pgtable_test.c | 425 +++++++++++++++++++++++++++++++++++++++++ 3 files changed, 440 insertions(+) create mode 100644 mm/arch_pgtable_test.c -- 2.20.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel