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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0D8A9C6FD1F for ; Tue, 14 Mar 2023 04:24:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229865AbjCNEYT (ORCPT ); Tue, 14 Mar 2023 00:24:19 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37890 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229842AbjCNEYP (ORCPT ); Tue, 14 Mar 2023 00:24:15 -0400 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 6BE281F5CC; Mon, 13 Mar 2023 21:24:14 -0700 (PDT) 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 D35724B3; Mon, 13 Mar 2023 21:24:57 -0700 (PDT) Received: from a077209.blr.arm.com (a077209.arm.com [10.162.42.149]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id AAC733F71A; Mon, 13 Mar 2023 21:24:11 -0700 (PDT) From: Chaitanya S Prakash To: linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: Chaitanya S Prakash , Andrew Morton , Shuah Khan , linux-kselftest@vger.kernel.org Subject: [PATCH 3/3] selftests: Set overcommit_policy as OVERCOMMIT_ALWAYS Date: Tue, 14 Mar 2023 09:53:51 +0530 Message-Id: <20230314042351.13134-4-chaitanyas.prakash@arm.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230314042351.13134-1-chaitanyas.prakash@arm.com> References: <20230314042351.13134-1-chaitanyas.prakash@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org The kernel's default behaviour is to obstruct the allocation of high virtual address as it handles memory overcommit in a heuristic manner. Setting the parameter as OVERCOMMIT_ALWAYS, ensures kernel isn't susceptible to the availability of a platform's physical memory when denying a memory allocation request. Cc: Andrew Morton Cc: Shuah Khan Cc: linux-mm@kvack.org Cc: linux-kselftest@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Chaitanya S Prakash --- tools/testing/selftests/mm/run_vmtests.sh | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/tools/testing/selftests/mm/run_vmtests.sh b/tools/testing/selftests/mm/run_vmtests.sh index 8984e0bb58c7..c0f93b668c0c 100644 --- a/tools/testing/selftests/mm/run_vmtests.sh +++ b/tools/testing/selftests/mm/run_vmtests.sh @@ -220,7 +220,15 @@ CATEGORY="mremap" run_test ./mremap_test CATEGORY="hugetlb" run_test ./thuge-gen if [ $VADDR64 -ne 0 ]; then + + # set overcommit_policy as OVERCOMMIT_ALWAYS so that kernel + # allows high virtual address allocation requests independent + # of platform's physical memory. + + prev_policy=$(cat /proc/sys/vm/overcommit_memory) + echo 1 > /proc/sys/vm/overcommit_memory CATEGORY="hugevm" run_test ./virtual_address_range + echo $prev_policy > /proc/sys/vm/overcommit_memory # virtual address 128TB switch test CATEGORY="hugevm" run_test ./va_128TBswitch.sh -- 2.30.2