From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf0-f199.google.com (mail-pf0-f199.google.com [209.85.192.199]) by kanga.kvack.org (Postfix) with ESMTP id DC0AD6B0292 for ; Thu, 20 Jul 2017 05:37:05 -0400 (EDT) Received: by mail-pf0-f199.google.com with SMTP id d18so24297743pfe.8 for ; Thu, 20 Jul 2017 02:37:05 -0700 (PDT) Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com. [148.163.156.1]) by mx.google.com with ESMTPS id l1si1283553plb.824.2017.07.20.02.37.04 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 20 Jul 2017 02:37:04 -0700 (PDT) Received: from pps.filterd (m0098409.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.21/8.16.0.21) with SMTP id v6K9Xe9M038709 for ; Thu, 20 Jul 2017 05:37:04 -0400 Received: from e23smtp03.au.ibm.com (e23smtp03.au.ibm.com [202.81.31.145]) by mx0a-001b2d01.pphosted.com with ESMTP id 2btjhmrhx3-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Thu, 20 Jul 2017 05:37:03 -0400 Received: from localhost by e23smtp03.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Thu, 20 Jul 2017 19:37:01 +1000 Received: from d23av02.au.ibm.com (d23av02.au.ibm.com [9.190.235.138]) by d23relay08.au.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id v6K9awKd24117394 for ; Thu, 20 Jul 2017 19:36:58 +1000 Received: from d23av02.au.ibm.com (localhost [127.0.0.1]) by d23av02.au.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id v6K9aoSU019556 for ; Thu, 20 Jul 2017 19:36:50 +1000 From: Anshuman Khandual Subject: [PATCH] selftests/vm: Add test to validate mirror functionality with mremap Date: Thu, 20 Jul 2017 15:06:51 +0530 Message-Id: <20170720093651.22106-1-khandual@linux.vnet.ibm.com> Sender: owner-linux-mm@kvack.org List-ID: To: linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: akpm@linux-foundation.org, mike.kravetz@oracle.com 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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org