From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from sog-mx-1.v43.ch3.sourceforge.com ([172.29.43.191] helo=mx.sourceforge.net) by sfs-ml-2.v29.ch3.sourceforge.com with esmtp (Exim 4.76) (envelope-from ) id 1SS6Mc-00085t-Tg for ltp-list@lists.sourceforge.net; Wed, 09 May 2012 12:51:30 +0000 Received: from [222.73.24.84] (helo=song.cn.fujitsu.com) by sog-mx-1.v43.ch3.sourceforge.com with esmtp (Exim 4.76) id 1SS6MX-0003TZ-9G for ltp-list@lists.sourceforge.net; Wed, 09 May 2012 12:51:30 +0000 Message-ID: <4FAA67FF.6090808@cn.fujitsu.com> Date: Wed, 09 May 2012 20:50:07 +0800 From: Wanlong Gao MIME-Version: 1.0 References: <50e8b720-2459-4cf4-bfbd-fcc4cd408249@zmail13.collab.prod.int.phx2.redhat.com> <85e08d38-234a-4bc6-8c4f-6c92b50dc9b1@zmail13.collab.prod.int.phx2.redhat.com> In-Reply-To: Subject: Re: [LTP] mm: move_pages syscall can't return ENOENT when pages are not present Reply-To: gaowanlong@cn.fujitsu.com List-Id: Linux Test Project General Discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: ltp-list-bounces@lists.sourceforge.net To: Xiaotian Feng Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, LTP List On 05/09/2012 05:28 PM, Xiaotian Feng wrote: > On Wed, May 9, 2012 at 4:58 PM, Zhouping Liu wrote: >> hi, all >> >> Recently, I found an error in move_pages syscall: >> >> depending on move_pages(2), when page is not present, >> it should fail with ENOENT, in fact, it's ok without >> any errno. >> >> the following reproducer can easily reproduce >> the issue, suggest you get more details by strace. >> inside reproducer, I try to move a non-exist page from >> node 1 to node 0. >> >> I have tested it on the latest kernel 3.4-rc5 with 2 and 4 numa nodes. >> [zliu@ZhoupingLiu ~]$ gcc -o reproducer reproducer.c -lnuma >> [zliu@ZhoupingLiu ~]$ ./reproducer >> from_node is 1, to_node is 0 >> ERROR: move_pages expected FAIL. >> > > " If nodes is not NULL, move_pages returns the number of valid > migration requests which could not currently be performed. Otherwise > it returns 0." FYI, actually, commit e78bbfa8262424417a29349a8064a535053912b9 Author: Brice Goglin Date: Sat Oct 18 20:27:15 2008 -0700 mm: stop returning -ENOENT from sys_move_pages() if nothing got migrated this commit changed the behaviour. And the LTP has fixed to be consistent with this, https://github.com/linux-test-project/ltp/commit/338299da1ff27c7815183c1b07eb91e705f117ce Thanks, Wanlong Gao > >> I'm not in mail list, please CC me. >> >> /* >> * Copyright (C) 2012 Red Hat, Inc. >> * >> * This work is licensed under the terms of the GNU GPL, version 2. See >> * the COPYING file in the top-level directory. >> * >> * Compiled: gcc -o reproducer reproducer.c -lnuma >> * Description: >> * it's designed to check move_pages syscall, when >> * page is not present, it should fail with ENOENT. >> */ >> >> #include >> #include >> #include >> #include >> #include >> #include >> #include >> #include >> >> #define TEST_PAGES 4 >> >> int main(int argc, char **argv) >> { >> void *pages[TEST_PAGES]; >> int onepage; >> int nodes[TEST_PAGES]; >> int status, ret; >> int i, from_node = 1, to_node = 0; >> >> onepage = getpagesize(); >> >> for (i = 0; i < TEST_PAGES - 1; i++) { >> pages[i] = numa_alloc_onnode(onepage, from_node); >> nodes[i] = to_node; >> } >> >> nodes[TEST_PAGES - 1] = to_node; >> >> /* >> * the follow page is not available, also not aligned, >> * depend on move_pages(2), it can't be moved, and should >> * return ENOENT errno. >> */ >> pages[TEST_PAGES - 1] = pages[TEST_PAGES - 2] - onepage * 4 + 1; >> >> printf("from_node is %u, to_node is %u\n", from_node, to_node); >> ret = move_pages(0, TEST_PAGES, pages, nodes, &status, MPOL_MF_MOVE); >> if (ret == -1) { >> if (errno != ENOENT) >> perror("move_pages expected ENOENT errno, but it's"); >> else >> printf("Succeed\n"); >> } else { >> printf("ERROR: move_pages expected FAIL.\n"); >> } >> >> for (i = 0; i < TEST_PAGES; i++) >> numa_free(pages[i], onepage); >> >> return 0; >> } >> >> -- >> Thanks, >> Zhouping >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in >> the body of a message to majordomo@vger.kernel.org >> More majordomo info at http://vger.kernel.org/majordomo-info.html >> Please read the FAQ at http://www.tux.org/lkml/ > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ > ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Ltp-list mailing list Ltp-list@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/ltp-list