From patchwork Fri Jan 17 23:22:50 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wei Yang X-Patchwork-Id: 11339987 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 3C4B7109A for ; Fri, 17 Jan 2020 23:23:08 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 1F72922464 for ; Fri, 17 Jan 2020 23:23:08 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1F72922464 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id B6CDB6B0503; Fri, 17 Jan 2020 18:23:06 -0500 (EST) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id B1DFE6B0504; Fri, 17 Jan 2020 18:23:06 -0500 (EST) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id A0D866B0505; Fri, 17 Jan 2020 18:23:06 -0500 (EST) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0234.hostedemail.com [216.40.44.234]) by kanga.kvack.org (Postfix) with ESMTP id 8D48B6B0503 for ; Fri, 17 Jan 2020 18:23:06 -0500 (EST) Received: from smtpin12.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with SMTP id 503822494 for ; Fri, 17 Jan 2020 23:23:06 +0000 (UTC) X-FDA: 76388703972.12.men09_382314c5c7a20 X-Spam-Summary: 1,0,0,,d41d8cd98f00b204,richardw.yang@linux.intel.com,:akpm@linux-foundation.org:dan.j.williams@intel.com:aneesh.kumar@linux.ibm.com:kirill@shutemov.name:yang.shi@linux.alibaba.com:richardw.yang@linux.intel.com:thellstrom@vmware.com:linux-kernel@vger.kernel.org:,RULES_HIT:30054:30070,0,RBL:134.134.136.31:@linux.intel.com:.lbl8.mailshell.net-62.18.0.100 64.95.201.95,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:fn,MSBL:0,DNSBL:neutral,Custom_rules:0:0:0,LFtime:24,LUA_SUMMARY:none X-HE-Tag: men09_382314c5c7a20 X-Filterd-Recvd-Size: 2070 Received: from mga06.intel.com (mga06.intel.com [134.134.136.31]) by imf30.hostedemail.com (Postfix) with ESMTP for ; Fri, 17 Jan 2020 23:23:05 +0000 (UTC) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga001.jf.intel.com ([10.7.209.18]) by orsmga104.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 17 Jan 2020 15:23:04 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.70,332,1574150400"; d="scan'208";a="306388155" Received: from richard.sh.intel.com (HELO localhost) ([10.239.159.54]) by orsmga001.jf.intel.com with ESMTP; 17 Jan 2020 15:23:02 -0800 From: Wei Yang To: akpm@linux-foundation.org, dan.j.williams@intel.com, aneesh.kumar@linux.ibm.com, kirill@shutemov.name, yang.shi@linux.alibaba.com, richardw.yang@linux.intel.com, thellstrom@vmware.com Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 1/5] mm/mremap: format the check in move_normal_pmd() same as move_huge_pmd() Date: Sat, 18 Jan 2020 07:22:50 +0800 Message-Id: <20200117232254.2792-2-richardw.yang@linux.intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200117232254.2792-1-richardw.yang@linux.intel.com> References: <20200117232254.2792-1-richardw.yang@linux.intel.com> X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: No functional change, just improve the readability and prepare for following cleanup. Signed-off-by: Wei Yang --- mm/mremap.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/mm/mremap.c b/mm/mremap.c index 122938dcec15..bcc7aa62f2d9 100644 --- a/mm/mremap.c +++ b/mm/mremap.c @@ -200,8 +200,9 @@ static bool move_normal_pmd(struct vm_area_struct *vma, unsigned long old_addr, struct mm_struct *mm = vma->vm_mm; pmd_t pmd; - if ((old_addr & ~PMD_MASK) || (new_addr & ~PMD_MASK) - || old_end - old_addr < PMD_SIZE) + if ((old_addr & ~PMD_MASK) || + (new_addr & ~PMD_MASK) || + old_end - old_addr < PMD_SIZE) return false; /* From patchwork Fri Jan 17 23:22:51 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wei Yang X-Patchwork-Id: 11339989 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 5FF0392A for ; Fri, 17 Jan 2020 23:23:10 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 3791B22464 for ; Fri, 17 Jan 2020 23:23:10 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3791B22464 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 2E4A46B0504; Fri, 17 Jan 2020 18:23:08 -0500 (EST) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 1AC0B6B0505; Fri, 17 Jan 2020 18:23:08 -0500 (EST) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 09A646B0506; Fri, 17 Jan 2020 18:23:07 -0500 (EST) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0154.hostedemail.com [216.40.44.154]) by kanga.kvack.org (Postfix) with ESMTP id E21DE6B0504 for ; Fri, 17 Jan 2020 18:23:07 -0500 (EST) Received: from smtpin08.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with SMTP id 8B6E1181AEF1A for ; Fri, 17 Jan 2020 23:23:07 +0000 (UTC) X-FDA: 76388704014.08.kick12_3851505173a23 X-Spam-Summary: 1,0,0,,d41d8cd98f00b204,richardw.yang@linux.intel.com,:akpm@linux-foundation.org:dan.j.williams@intel.com:aneesh.kumar@linux.ibm.com:kirill@shutemov.name:yang.shi@linux.alibaba.com:richardw.yang@linux.intel.com:thellstrom@vmware.com:linux-kernel@vger.kernel.org:,RULES_HIT:30054:30070,0,RBL:134.134.136.31:@linux.intel.com:.lbl8.mailshell.net-62.18.0.100 64.95.201.95,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:fn,MSBL:0,DNSBL:neutral,Custom_rules:0:0:0,LFtime:26,LUA_SUMMARY:none X-HE-Tag: kick12_3851505173a23 X-Filterd-Recvd-Size: 4857 Received: from mga06.intel.com (mga06.intel.com [134.134.136.31]) by imf30.hostedemail.com (Postfix) with ESMTP for ; Fri, 17 Jan 2020 23:23:06 +0000 (UTC) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga001.jf.intel.com ([10.7.209.18]) by orsmga104.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 17 Jan 2020 15:23:06 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.70,332,1574150400"; d="scan'208";a="306388163" Received: from richard.sh.intel.com (HELO localhost) ([10.239.159.54]) by orsmga001.jf.intel.com with ESMTP; 17 Jan 2020 15:23:04 -0800 From: Wei Yang To: akpm@linux-foundation.org, dan.j.williams@intel.com, aneesh.kumar@linux.ibm.com, kirill@shutemov.name, yang.shi@linux.alibaba.com, richardw.yang@linux.intel.com, thellstrom@vmware.com Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 2/5] mm/mremap: it is sure to have enough space when extent meets requirement Date: Sat, 18 Jan 2020 07:22:51 +0800 Message-Id: <20200117232254.2792-3-richardw.yang@linux.intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200117232254.2792-1-richardw.yang@linux.intel.com> References: <20200117232254.2792-1-richardw.yang@linux.intel.com> X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: old_end is passed to these two function to check whether there is enough space to do the move, while this check is done before invoking these functions. These two functions only would be invoked when extent meets the requirement and there is one check before invoking these functions: if (extent > old_end - old_addr) extent = old_end - old_addr; This implies (old_end - old_addr) won't fail the check in these two functions. Signed-off-by: Wei Yang --- include/linux/huge_mm.h | 2 +- mm/huge_memory.c | 7 ++----- mm/mremap.c | 11 ++++------- 3 files changed, 7 insertions(+), 13 deletions(-) diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h index 0b84e13e88e2..2a5281ca46c8 100644 --- a/include/linux/huge_mm.h +++ b/include/linux/huge_mm.h @@ -42,7 +42,7 @@ extern int mincore_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd, unsigned long addr, unsigned long end, unsigned char *vec); extern bool move_huge_pmd(struct vm_area_struct *vma, unsigned long old_addr, - unsigned long new_addr, unsigned long old_end, + unsigned long new_addr, pmd_t *old_pmd, pmd_t *new_pmd); extern int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd, unsigned long addr, pgprot_t newprot, diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 5b2876942639..8f1bbbf01f5b 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -1871,17 +1871,14 @@ static pmd_t move_soft_dirty_pmd(pmd_t pmd) } bool move_huge_pmd(struct vm_area_struct *vma, unsigned long old_addr, - unsigned long new_addr, unsigned long old_end, - pmd_t *old_pmd, pmd_t *new_pmd) + unsigned long new_addr, pmd_t *old_pmd, pmd_t *new_pmd) { spinlock_t *old_ptl, *new_ptl; pmd_t pmd; struct mm_struct *mm = vma->vm_mm; bool force_flush = false; - if ((old_addr & ~HPAGE_PMD_MASK) || - (new_addr & ~HPAGE_PMD_MASK) || - old_end - old_addr < HPAGE_PMD_SIZE) + if ((old_addr & ~HPAGE_PMD_MASK) || (new_addr & ~HPAGE_PMD_MASK)) return false; /* diff --git a/mm/mremap.c b/mm/mremap.c index bcc7aa62f2d9..c2af8ba4ba43 100644 --- a/mm/mremap.c +++ b/mm/mremap.c @@ -193,16 +193,13 @@ static void move_ptes(struct vm_area_struct *vma, pmd_t *old_pmd, #ifdef CONFIG_HAVE_MOVE_PMD static bool move_normal_pmd(struct vm_area_struct *vma, unsigned long old_addr, - unsigned long new_addr, unsigned long old_end, - pmd_t *old_pmd, pmd_t *new_pmd) + unsigned long new_addr, pmd_t *old_pmd, pmd_t *new_pmd) { spinlock_t *old_ptl, *new_ptl; struct mm_struct *mm = vma->vm_mm; pmd_t pmd; - if ((old_addr & ~PMD_MASK) || - (new_addr & ~PMD_MASK) || - old_end - old_addr < PMD_SIZE) + if ((old_addr & ~PMD_MASK) || (new_addr & ~PMD_MASK)) return false; /* @@ -274,7 +271,7 @@ unsigned long move_page_tables(struct vm_area_struct *vma, if (need_rmap_locks) take_rmap_locks(vma); moved = move_huge_pmd(vma, old_addr, new_addr, - old_end, old_pmd, new_pmd); + old_pmd, new_pmd); if (need_rmap_locks) drop_rmap_locks(vma); if (moved) @@ -294,7 +291,7 @@ unsigned long move_page_tables(struct vm_area_struct *vma, if (need_rmap_locks) take_rmap_locks(vma); moved = move_normal_pmd(vma, old_addr, new_addr, - old_end, old_pmd, new_pmd); + old_pmd, new_pmd); if (need_rmap_locks) drop_rmap_locks(vma); if (moved) From patchwork Fri Jan 17 23:22:52 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wei Yang X-Patchwork-Id: 11339991 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id DDCCE109A for ; Fri, 17 Jan 2020 23:23:12 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id AB23E2464B for ; Fri, 17 Jan 2020 23:23:12 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org AB23E2464B Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 469426B0507; Fri, 17 Jan 2020 18:23:10 -0500 (EST) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 41A0D6B0508; Fri, 17 Jan 2020 18:23:10 -0500 (EST) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 358666B0509; Fri, 17 Jan 2020 18:23:10 -0500 (EST) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0120.hostedemail.com [216.40.44.120]) by kanga.kvack.org (Postfix) with ESMTP id 1103B6B0507 for ; Fri, 17 Jan 2020 18:23:10 -0500 (EST) Received: from smtpin15.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with SMTP id D15AD180AD807 for ; Fri, 17 Jan 2020 23:23:09 +0000 (UTC) X-FDA: 76388704098.15.patch83_38a6c543dbd27 X-Spam-Summary: 1,0,0,,d41d8cd98f00b204,richardw.yang@linux.intel.com,:akpm@linux-foundation.org:dan.j.williams@intel.com:aneesh.kumar@linux.ibm.com:kirill@shutemov.name:yang.shi@linux.alibaba.com:richardw.yang@linux.intel.com:thellstrom@vmware.com:linux-kernel@vger.kernel.org:,RULES_HIT:30054:30070,0,RBL:134.134.136.31:@linux.intel.com:.lbl8.mailshell.net-62.18.0.100 64.95.201.95,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:fn,MSBL:0,DNSBL:neutral,Custom_rules:0:0:0,LFtime:24,LUA_SUMMARY:none X-HE-Tag: patch83_38a6c543dbd27 X-Filterd-Recvd-Size: 2518 Received: from mga06.intel.com (mga06.intel.com [134.134.136.31]) by imf30.hostedemail.com (Postfix) with ESMTP for ; Fri, 17 Jan 2020 23:23:09 +0000 (UTC) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga001.jf.intel.com ([10.7.209.18]) by orsmga104.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 17 Jan 2020 15:23:08 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.70,332,1574150400"; d="scan'208";a="306388172" Received: from richard.sh.intel.com (HELO localhost) ([10.239.159.54]) by orsmga001.jf.intel.com with ESMTP; 17 Jan 2020 15:23:07 -0800 From: Wei Yang To: akpm@linux-foundation.org, dan.j.williams@intel.com, aneesh.kumar@linux.ibm.com, kirill@shutemov.name, yang.shi@linux.alibaba.com, richardw.yang@linux.intel.com, thellstrom@vmware.com Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 3/5] mm/mremap: use pmd_addr_end to calculate next in move_page_tables() Date: Sat, 18 Jan 2020 07:22:52 +0800 Message-Id: <20200117232254.2792-4-richardw.yang@linux.intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200117232254.2792-1-richardw.yang@linux.intel.com> References: <20200117232254.2792-1-richardw.yang@linux.intel.com> X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Use the general helper instead of do it by hand. Signed-off-by: Wei Yang --- mm/mremap.c | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-) diff --git a/mm/mremap.c b/mm/mremap.c index c2af8ba4ba43..a258914f3ee1 100644 --- a/mm/mremap.c +++ b/mm/mremap.c @@ -253,11 +253,8 @@ unsigned long move_page_tables(struct vm_area_struct *vma, for (; old_addr < old_end; old_addr += extent, new_addr += extent) { cond_resched(); - next = (old_addr + PMD_SIZE) & PMD_MASK; - /* even if next overflowed, extent below will be ok */ + next = pmd_addr_end(old_addr, old_end); extent = next - old_addr; - if (extent > old_end - old_addr) - extent = old_end - old_addr; old_pmd = get_old_pmd(vma->vm_mm, old_addr); if (!old_pmd) continue; @@ -301,7 +298,7 @@ unsigned long move_page_tables(struct vm_area_struct *vma, if (pte_alloc(new_vma->vm_mm, new_pmd)) break; - next = (new_addr + PMD_SIZE) & PMD_MASK; + next = pmd_addr_end(new_addr, new_addr + len); if (extent > next - new_addr) extent = next - new_addr; move_ptes(vma, old_pmd, old_addr, old_addr + extent, new_vma, From patchwork Fri Jan 17 23:22:53 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wei Yang X-Patchwork-Id: 11339993 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 14301109A for ; Fri, 17 Jan 2020 23:23:15 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id DF3E32467E for ; Fri, 17 Jan 2020 23:23:14 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org DF3E32467E Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 8B3396B0509; Fri, 17 Jan 2020 18:23:12 -0500 (EST) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 83A006B050A; Fri, 17 Jan 2020 18:23:12 -0500 (EST) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 74F906B050B; Fri, 17 Jan 2020 18:23:12 -0500 (EST) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0239.hostedemail.com [216.40.44.239]) by kanga.kvack.org (Postfix) with ESMTP id 5A8DE6B0509 for ; Fri, 17 Jan 2020 18:23:12 -0500 (EST) Received: from smtpin18.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with SMTP id 32F1E8248076 for ; Fri, 17 Jan 2020 23:23:12 +0000 (UTC) X-FDA: 76388704224.18.legs42_3901db5aa4f2c X-Spam-Summary: 1,0,0,,d41d8cd98f00b204,richardw.yang@linux.intel.com,:akpm@linux-foundation.org:dan.j.williams@intel.com:aneesh.kumar@linux.ibm.com:kirill@shutemov.name:yang.shi@linux.alibaba.com:richardw.yang@linux.intel.com:thellstrom@vmware.com:linux-kernel@vger.kernel.org:,RULES_HIT:30012:30054:30070,0,RBL:134.134.136.31:@linux.intel.com:.lbl8.mailshell.net-62.18.0.100 64.95.201.95,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:fn,MSBL:0,DNSBL:neutral,Custom_rules:0:0:0,LFtime:24,LUA_SUMMARY:none X-HE-Tag: legs42_3901db5aa4f2c X-Filterd-Recvd-Size: 3247 Received: from mga06.intel.com (mga06.intel.com [134.134.136.31]) by imf30.hostedemail.com (Postfix) with ESMTP for ; Fri, 17 Jan 2020 23:23:11 +0000 (UTC) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga001.jf.intel.com ([10.7.209.18]) by orsmga104.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 17 Jan 2020 15:23:11 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.70,332,1574150400"; d="scan'208";a="306388179" Received: from richard.sh.intel.com (HELO localhost) ([10.239.159.54]) by orsmga001.jf.intel.com with ESMTP; 17 Jan 2020 15:23:09 -0800 From: Wei Yang To: akpm@linux-foundation.org, dan.j.williams@intel.com, aneesh.kumar@linux.ibm.com, kirill@shutemov.name, yang.shi@linux.alibaba.com, richardw.yang@linux.intel.com, thellstrom@vmware.com Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 4/5] mm/mremap: calculate extent in one place Date: Sat, 18 Jan 2020 07:22:53 +0800 Message-Id: <20200117232254.2792-5-richardw.yang@linux.intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200117232254.2792-1-richardw.yang@linux.intel.com> References: <20200117232254.2792-1-richardw.yang@linux.intel.com> X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Page tables is moved on the base of PMD. This requires both source and destination range should meet the requirement. Current code works well since move_huge_pmd() and move_normal_pmd() would check old_addr and new_addr again. And then return to move_ptes() if the either of them is not aligned. In stead of calculating the extent separately, it is better to calculate in one place, so we know it is not necessary to try move pmd. By doing so, the logic seems a little clear. Signed-off-by: Wei Yang --- mm/mremap.c | 10 ++++------ 1 file changed, 4 insertions(+), 6 deletions(-) diff --git a/mm/mremap.c b/mm/mremap.c index a258914f3ee1..37335a10779d 100644 --- a/mm/mremap.c +++ b/mm/mremap.c @@ -240,7 +240,7 @@ unsigned long move_page_tables(struct vm_area_struct *vma, unsigned long new_addr, unsigned long len, bool need_rmap_locks) { - unsigned long extent, next, old_end; + unsigned long extent, old_next, new_next, old_end; struct mmu_notifier_range range; pmd_t *old_pmd, *new_pmd; @@ -253,8 +253,9 @@ unsigned long move_page_tables(struct vm_area_struct *vma, for (; old_addr < old_end; old_addr += extent, new_addr += extent) { cond_resched(); - next = pmd_addr_end(old_addr, old_end); - extent = next - old_addr; + old_next = pmd_addr_end(old_addr, old_end); + new_next = pmd_addr_end(new_addr, new_addr + len); + extent = min((old_next - old_addr), (new_next - new_addr)); old_pmd = get_old_pmd(vma->vm_mm, old_addr); if (!old_pmd) continue; @@ -298,9 +299,6 @@ unsigned long move_page_tables(struct vm_area_struct *vma, if (pte_alloc(new_vma->vm_mm, new_pmd)) break; - next = pmd_addr_end(new_addr, new_addr + len); - if (extent > next - new_addr) - extent = next - new_addr; move_ptes(vma, old_pmd, old_addr, old_addr + extent, new_vma, new_pmd, new_addr, need_rmap_locks); } From patchwork Fri Jan 17 23:22:54 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wei Yang X-Patchwork-Id: 11339995 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 6597D92A for ; Fri, 17 Jan 2020 23:23:17 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 3C9D124673 for ; Fri, 17 Jan 2020 23:23:17 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3C9D124673 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id BE2906B050B; Fri, 17 Jan 2020 18:23:14 -0500 (EST) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id B94D16B050C; Fri, 17 Jan 2020 18:23:14 -0500 (EST) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id A0DEB6B050D; Fri, 17 Jan 2020 18:23:14 -0500 (EST) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0161.hostedemail.com [216.40.44.161]) by kanga.kvack.org (Postfix) with ESMTP id 85D1A6B050B for ; Fri, 17 Jan 2020 18:23:14 -0500 (EST) Received: from smtpin10.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with SMTP id 504F54DA1 for ; Fri, 17 Jan 2020 23:23:14 +0000 (UTC) X-FDA: 76388704308.10.spoon03_394d5829d172e X-Spam-Summary: 1,0,0,,d41d8cd98f00b204,richardw.yang@linux.intel.com,:akpm@linux-foundation.org:dan.j.williams@intel.com:aneesh.kumar@linux.ibm.com:kirill@shutemov.name:yang.shi@linux.alibaba.com:richardw.yang@linux.intel.com:thellstrom@vmware.com:linux-kernel@vger.kernel.org:,RULES_HIT:30054:30070,0,RBL:134.134.136.31:@linux.intel.com:.lbl8.mailshell.net-62.18.0.100 64.95.201.95,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:fn,MSBL:0,DNSBL:neutral,Custom_rules:0:0:0,LFtime:25,LUA_SUMMARY:none X-HE-Tag: spoon03_394d5829d172e X-Filterd-Recvd-Size: 2715 Received: from mga06.intel.com (mga06.intel.com [134.134.136.31]) by imf30.hostedemail.com (Postfix) with ESMTP for ; Fri, 17 Jan 2020 23:23:13 +0000 (UTC) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga001.jf.intel.com ([10.7.209.18]) by orsmga104.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 17 Jan 2020 15:23:13 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.70,332,1574150400"; d="scan'208";a="306388189" Received: from richard.sh.intel.com (HELO localhost) ([10.239.159.54]) by orsmga001.jf.intel.com with ESMTP; 17 Jan 2020 15:23:11 -0800 From: Wei Yang To: akpm@linux-foundation.org, dan.j.williams@intel.com, aneesh.kumar@linux.ibm.com, kirill@shutemov.name, yang.shi@linux.alibaba.com, richardw.yang@linux.intel.com, thellstrom@vmware.com Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 5/5] mm/mremap: start addresses are properly aligned Date: Sat, 18 Jan 2020 07:22:54 +0800 Message-Id: <20200117232254.2792-6-richardw.yang@linux.intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200117232254.2792-1-richardw.yang@linux.intel.com> References: <20200117232254.2792-1-richardw.yang@linux.intel.com> X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: After previous cleanup, extent is the minimal step for both source and destination. This means when extent is HPAGE_PMD_SIZE or PMD_SIZE, old_addr and new_addr are properly aligned too. Since these two functions are only invoked in move_page_tables, it is safe to remove the check now. Signed-off-by: Wei Yang --- mm/huge_memory.c | 3 --- mm/mremap.c | 3 --- 2 files changed, 6 deletions(-) diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 8f1bbbf01f5b..cc98d0f07d0a 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -1878,9 +1878,6 @@ bool move_huge_pmd(struct vm_area_struct *vma, unsigned long old_addr, struct mm_struct *mm = vma->vm_mm; bool force_flush = false; - if ((old_addr & ~HPAGE_PMD_MASK) || (new_addr & ~HPAGE_PMD_MASK)) - return false; - /* * The destination pmd shouldn't be established, free_pgtables() * should have release it. diff --git a/mm/mremap.c b/mm/mremap.c index 37335a10779d..5d7597fb3023 100644 --- a/mm/mremap.c +++ b/mm/mremap.c @@ -199,9 +199,6 @@ static bool move_normal_pmd(struct vm_area_struct *vma, unsigned long old_addr, struct mm_struct *mm = vma->vm_mm; pmd_t pmd; - if ((old_addr & ~PMD_MASK) || (new_addr & ~PMD_MASK)) - return false; - /* * The destination pmd shouldn't be established, free_pgtables() * should have release it.