From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750824AbdGYGi2 (ORCPT ); Tue, 25 Jul 2017 02:38:28 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:40352 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1750745AbdGYGi0 (ORCPT ); Tue, 25 Jul 2017 02:38:26 -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 V2] selftests/vm: Add tests to validate mirror functionality with mremap Date: Tue, 25 Jul 2017 12:06:57 +0530 X-Mailer: git-send-email 2.9.3 X-TM-AS-MML: disable x-cbid: 17072506-0040-0000-0000-0000034B2A76 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 17072506-0041-0000-0000-00000CC7639C Message-Id: <20170725063657.3915-1-khandual@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2017-07-25_02:,, 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-1707250108 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This adds two tests to validate mirror functionality with mremap() system call on shared and private anon mappings. Suggested-by: Mike Kravetz Signed-off-by: Anshuman Khandual --- Changes in V2: - Added a test for private anon mappings - Used sysconf(_SC_PAGESIZE) instead of hard coding page size - Used MREMAP_MAYMOVE instead of hard coding the flag value 1 tools/testing/selftests/vm/Makefile | 2 + .../selftests/vm/mremap_mirror_private_anon.c | 49 ++++++++++++++++++ .../selftests/vm/mremap_mirror_shared_anon.c | 58 ++++++++++++++++++++++ 3 files changed, 109 insertions(+) create mode 100644 tools/testing/selftests/vm/mremap_mirror_private_anon.c 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..6401f91 100644 --- a/tools/testing/selftests/vm/Makefile +++ b/tools/testing/selftests/vm/Makefile @@ -17,6 +17,8 @@ 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_GEN_FILES += mremap_mirror_private_anon TEST_PROGS := run_vmtests diff --git a/tools/testing/selftests/vm/mremap_mirror_private_anon.c b/tools/testing/selftests/vm/mremap_mirror_private_anon.c new file mode 100644 index 0000000..3106809 --- /dev/null +++ b/tools/testing/selftests/vm/mremap_mirror_private_anon.c @@ -0,0 +1,49 @@ +/* + * Test to verify mirror functionality with mremap() system + * call for private anon mappings. The 'mirrored' buffer is + * a separate distinct unrelated mapping and different from + * that of the original one. + * + * Copyright (C) 2017 Anshuman Khandual, IBM Corporation + * + * Licensed under GPL V2 + */ +#define _GNU_SOURCE +#include +#include +#include +#include +#include +#include + +#define PATTERN 0xbe +#define NR_PAGES 10 + +int main(int argc, char *argv[]) +{ + unsigned long alloc_size, i; + char *ptr, *mirror_ptr; + + alloc_size = sysconf(_SC_PAGESIZE) * NR_PAGES; + ptr = mmap(NULL, alloc_size, PROT_READ | PROT_WRITE, + MAP_PRIVATE | 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, MREMAP_MAYMOVE); + if (mirror_ptr == MAP_FAILED) { + perror("mremap() failed"); + return -1; + } + + for (i = 0; i < alloc_size; i++) { + if (ptr[i] == mirror_ptr[i]) { + printf("Mirror buffer elements matched at %lu\n", i); + return 1; + } + } + return 0; +} 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..f775698 --- /dev/null +++ b/tools/testing/selftests/vm/mremap_mirror_shared_anon.c @@ -0,0 +1,58 @@ +/* + * Test to verify mirror functionality with mremap() system + * call for shared anon mappings. The 'mirrored' buffer will + * match element to element with that of the original one. + * + * Copyright (C) 2017 Anshuman Khandual, IBM Corporation + * + * Licensed under GPL V2 + */ +#define _GNU_SOURCE +#include +#include +#include +#include +#include +#include + +#define PATTERN 0xbe +#define NR_PAGES 10 + +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[]) +{ + unsigned long alloc_size; + char *ptr, *mirror_ptr; + + alloc_size = sysconf(_SC_PAGESIZE) * NR_PAGES; + 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, MREMAP_MAYMOVE); + 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