From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752658AbdA3Jja (ORCPT ); Mon, 30 Jan 2017 04:39:30 -0500 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:39606 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752534AbdA3Jia (ORCPT ); Mon, 30 Jan 2017 04:38:30 -0500 From: Anshuman Khandual To: linux-kernel@vger.kernel.org, linux-mm@kvack.org Cc: mhocko@suse.com, vbabka@suse.cz, mgorman@suse.de, minchan@kernel.org, aneesh.kumar@linux.vnet.ibm.com, bsingharora@gmail.com, srikar@linux.vnet.ibm.com, haren@linux.vnet.ibm.com, jglisse@redhat.com, dave.hansen@intel.com, dan.j.williams@intel.com Subject: [RFC V2 11/12] mm: Tag VMA with VM_CDM flag during page fault Date: Mon, 30 Jan 2017 09:05:52 +0530 X-Mailer: git-send-email 2.9.3 In-Reply-To: <20170130033602.12275-1-khandual@linux.vnet.ibm.com> References: <20170130033602.12275-1-khandual@linux.vnet.ibm.com> X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 17013003-0008-0000-0000-000001050275 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 17013003-0009-0000-0000-000008F7DD50 Message-Id: <20170130033602.12275-12-khandual@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2017-01-30_02:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=0 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1612050000 definitions=main-1701300038 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Mark the corresponding VMA with VM_CDM flag if the allocated page happens to be from a CDM node. This can be expensive from performance stand point. There are multiple checks to avoid an expensive page_to_nid lookup but it can be optimized further. Signed-off-by: Anshuman Khandual --- mm/mempolicy.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/mm/mempolicy.c b/mm/mempolicy.c index 6089c711..78e095b 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -174,6 +174,29 @@ static void mpol_relative_nodemask(nodemask_t *ret, const nodemask_t *orig, nodes_onto(*ret, tmp, *rel); } +#ifdef CONFIG_COHERENT_DEVICE +static void mark_vma_cdm(nodemask_t *nmask, + struct page *page, struct vm_area_struct *vma) +{ + if (!page) + return; + + if (vma->vm_flags & VM_CDM) + return; + + if (nmask && !nodemask_has_cdm(*nmask)) + return; + + if (is_cdm_node(page_to_nid(page))) + vma->vm_flags |= VM_CDM; +} +#else +static void mark_vma_cdm(nodemask_t *nmask, + struct page *page, struct vm_area_struct *vma) +{ +} +#endif + static int mpol_new_interleave(struct mempolicy *pol, const nodemask_t *nodes) { if (nodes_empty(*nodes)) @@ -2039,6 +2062,7 @@ alloc_pages_vma(gfp_t gfp, int order, struct vm_area_struct *vma, nmask = policy_nodemask(gfp, pol); zl = policy_zonelist(gfp, pol, node); page = __alloc_pages_nodemask(gfp, order, zl, nmask); + mark_vma_cdm(nmask, page, vma); mpol_cond_put(pol); out: if (unlikely(!page && read_mems_allowed_retry(cpuset_mems_cookie))) -- 2.9.3