From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S935788AbdGTJhI (ORCPT ); Thu, 20 Jul 2017 05:37:08 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:49745 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751150AbdGTJhF (ORCPT ); Thu, 20 Jul 2017 05:37:05 -0400 From: Anshuman Khandual To: linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: akpm@linux-foundation.org, mike.kravetz@oracle.com Subject: [PATCH] selftests/vm: Add test to validate mirror functionality with mremap Date: Thu, 20 Jul 2017 15:06:51 +0530 X-Mailer: git-send-email 2.9.3 X-TM-AS-MML: disable x-cbid: 17072009-1617-0000-0000-000001F7F669 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 17072009-1618-0000-0000-00004840D38B Message-Id: <20170720093651.22106-1-khandual@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2017-07-20_05:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=3 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1706020000 definitions=main-1707200153 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This adds a test to validate mirror functionality with mremap() system call on shared anon mappings. Suggested-by: Mike Kravetz Signed-off-by: Anshuman Khandual --- tools/testing/selftests/vm/Makefile | 1 + .../selftests/vm/mremap_mirror_shared_anon.c | 54 ++++++++++++++++++++++ 2 files changed, 55 insertions(+) create mode 100644 tools/testing/selftests/vm/mremap_mirror_shared_anon.c diff --git a/tools/testing/selftests/vm/Makefile b/tools/testing/selftests/vm/Makefile index cbb29e4..11657ff5 100644 --- a/tools/testing/selftests/vm/Makefile +++ b/tools/testing/selftests/vm/Makefile @@ -17,6 +17,7 @@ TEST_GEN_FILES += transhuge-stress TEST_GEN_FILES += userfaultfd TEST_GEN_FILES += mlock-random-test TEST_GEN_FILES += virtual_address_range +TEST_GEN_FILES += mremap_mirror_shared_anon TEST_PROGS := run_vmtests diff --git a/tools/testing/selftests/vm/mremap_mirror_shared_anon.c b/tools/testing/selftests/vm/mremap_mirror_shared_anon.c new file mode 100644 index 0000000..b0adbb2 --- /dev/null +++ b/tools/testing/selftests/vm/mremap_mirror_shared_anon.c @@ -0,0 +1,54 @@ +/* + * Test to verify mirror functionality with mremap() system + * call for shared anon mappings. + * + * Copyright (C) 2017 Anshuman Khandual, IBM Corporation + * + * Licensed under GPL V2 + */ +#include +#include +#include +#include +#include +#include + +#define PATTERN 0xbe +#define ALLOC_SIZE 0x10000UL /* Works for 64K and 4K pages */ + +int test_mirror(char *old, char *new, unsigned long size) +{ + unsigned long i; + + for (i = 0; i < size; i++) { + if (new[i] != old[i]) { + printf("Mismatch at new[%lu] expected " + "%d received %d\n", i, old[i], new[i]); + return 1; + } + } + return 0; +} + +int main(int argc, char *argv[]) +{ + char *ptr, *mirror_ptr; + + ptr = mmap(NULL, ALLOC_SIZE, PROT_READ | PROT_WRITE, + MAP_SHARED | MAP_ANONYMOUS, -1, 0); + if (ptr == MAP_FAILED) { + perror("map() failed"); + return -1; + } + memset(ptr, PATTERN, ALLOC_SIZE); + + mirror_ptr = (char *) mremap(ptr, 0, ALLOC_SIZE, 1); + if (mirror_ptr == MAP_FAILED) { + perror("mremap() failed"); + return -1; + } + + if (test_mirror(ptr, mirror_ptr, ALLOC_SIZE)) + return 1; + return 0; +} -- 1.8.5.2