From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752105AbdBOMIe (ORCPT ); Wed, 15 Feb 2017 07:08:34 -0500 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:47570 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751584AbdBOMHp (ORCPT ); Wed, 15 Feb 2017 07:07:45 -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: [PATCH V3 4/4] mm: Enable Buddy allocation isolation for CDM nodes Date: Wed, 15 Feb 2017 17:37:26 +0530 X-Mailer: git-send-email 2.9.3 In-Reply-To: <20170215120726.9011-1-khandual@linux.vnet.ibm.com> References: <20170215120726.9011-1-khandual@linux.vnet.ibm.com> X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 17021512-0004-0000-0000-0000053C1FC3 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 17021512-0005-0000-0000-000013356043 Message-Id: <20170215120726.9011-5-khandual@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2017-02-15_06:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=11 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1612050000 definitions=main-1702150118 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This implements allocation isolation for CDM nodes in buddy allocator by discarding CDM memory zones all the time except in the cases where the gfp flag has got __GFP_THISNODE or the nodemask contains CDM nodes in cases where it is non NULL (explicit allocation request in the kernel or user process MPOL_BIND policy based requests). Signed-off-by: Anshuman Khandual --- mm/page_alloc.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index afbd24d..40c942c 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -64,6 +64,7 @@ #include #include #include +#include #include #include @@ -2898,6 +2899,10 @@ get_page_from_freelist(gfp_t gfp_mask, unsigned int order, int alloc_flags, struct zoneref *z = ac->preferred_zoneref; struct zone *zone; struct pglist_data *last_pgdat_dirty_limit = NULL; + bool cpuset_fallback = false; + + if (ac->nodemask != orig_mask) + cpuset_fallback = true; /* * Scan zonelist, looking for a zone with enough free. @@ -2908,6 +2913,24 @@ get_page_from_freelist(gfp_t gfp_mask, unsigned int order, int alloc_flags, struct page *page; unsigned long mark; + /* + * CDM nodes get skipped if the requested gfp flag + * does not have __GFP_THISNODE set or the nodemask + * does not have any CDM nodes in case the nodemask + * is non NULL (explicit allocation requests from + * kernel or user process MPOL_BIND policy which has + * CDM nodes). + */ + if (is_cdm_node(zone->zone_pgdat->node_id)) { + if (!(gfp_mask & __GFP_THISNODE)) { + if (cpuset_fallback) + continue; + + if (!ac->nodemask) + continue; + } + } + if (cpusets_enabled() && (alloc_flags & ALLOC_CPUSET) && !__cpuset_zone_allowed(zone, gfp_mask)) -- 2.9.3