From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759677AbbA3HsA (ORCPT ); Fri, 30 Jan 2015 02:48:00 -0500 Received: from cnbjrel01.sonyericsson.com ([219.141.167.165]:2424 "EHLO cnbjrel01.sonyericsson.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752198AbbA3Hr7 convert rfc822-to-8bit (ORCPT ); Fri, 30 Jan 2015 02:47:59 -0500 From: "Wang, Yalin" To: "'akpm@linux-foundation.org'" , "'kirill.shutemov@linux.intel.com'" , "'oleg@redhat.com'" , "'gorcunov@openvz.org'" , "'n-horiguchi@ah.jp.nec.com'" , "'pfeiner@google.com'" , "'aquini@redhat.com'" , "'linux-kernel@vger.kernel.org'" Date: Fri, 30 Jan 2015 15:47:54 +0800 Subject: [RFC V2] mm:change smaps/pagemap_read calculation behavior Thread-Topic: [RFC V2] mm:change smaps/pagemap_read calculation behavior Thread-Index: AdA8VAGzBKTEfn7kR/6B5DTZrEaegQADO/3Q Message-ID: <35FD53F367049845BC99AC72306C23D1044A02027E06@CNBJMBX05.corpusers.net> References: <35FD53F367049845BC99AC72306C23D1044A02027E04@CNBJMBX05.corpusers.net> In-Reply-To: <35FD53F367049845BC99AC72306C23D1044A02027E04@CNBJMBX05.corpusers.net> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 8BIT MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch change smaps/pagemap_read pagetable walk behavior, to make sure not skip VM_PFNMAP pagetables, so that we can calculate COW pages of VM_PFNMAP as normal pages. Signed-off-by: Yalin Wang --- fs/proc/task_mmu.c | 2 ++ include/linux/mm.h | 2 ++ mm/pagewalk.c | 5 +++++ 3 files changed, 9 insertions(+) diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index c7267e9..e7d7c43 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -616,6 +616,7 @@ static int show_smap(struct seq_file *m, void *v, int is_pid) struct mem_size_stats mss; struct mm_walk smaps_walk = { .pmd_entry = smaps_pte_range, + .test_walk = generic_walk_page_test_no_skip, .mm = vma->vm_mm, .private = &mss, }; @@ -1264,6 +1265,7 @@ static ssize_t pagemap_read(struct file *file, char __user *buf, pagemap_walk.pmd_entry = pagemap_pte_range; pagemap_walk.pte_hole = pagemap_pte_hole; + pagemap_walk.test_walk = generic_walk_page_test_no_skip; #ifdef CONFIG_HUGETLB_PAGE pagemap_walk.hugetlb_entry = pagemap_hugetlb_range; #endif diff --git a/include/linux/mm.h b/include/linux/mm.h index b976d9f..07f71c5 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1191,6 +1191,8 @@ struct mm_walk { void *private; }; +int generic_walk_page_test_no_skip(unsigned long start, unsigned long end, + struct mm_walk *walk); int walk_page_range(unsigned long addr, unsigned long end, struct mm_walk *walk); int walk_page_vma(struct vm_area_struct *vma, struct mm_walk *walk); diff --git a/mm/pagewalk.c b/mm/pagewalk.c index 75c1f28..14f38d5 100644 --- a/mm/pagewalk.c +++ b/mm/pagewalk.c @@ -206,6 +206,11 @@ static int __walk_page_range(unsigned long start, unsigned long end, return err; } +int generic_walk_page_test_no_skip(unsigned long start, unsigned long end, + struct mm_walk *walk) +{ + return 0; +} /** * walk_page_range - walk page table with caller specific callbacks * -- 2.2.2