From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752073AbdJCPfj (ORCPT ); Tue, 3 Oct 2017 11:35:39 -0400 Received: from userp1040.oracle.com ([156.151.31.81]:17445 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751969AbdJCPfh (ORCPT ); Tue, 3 Oct 2017 11:35:37 -0400 Subject: Re: [PATCH v9 12/12] mm: stop zeroing memory during allocation in vmemmap To: Michal Hocko Cc: linux-kernel@vger.kernel.org, sparclinux@vger.kernel.org, linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, linux-arm-kernel@lists.infradead.org, x86@kernel.org, kasan-dev@googlegroups.com, borntraeger@de.ibm.com, heiko.carstens@de.ibm.com, davem@davemloft.net, willy@infradead.org, ard.biesheuvel@linaro.org, mark.rutland@arm.com, will.deacon@arm.com, catalin.marinas@arm.com, sam@ravnborg.org, mgorman@techsingularity.net, steven.sistare@oracle.com, daniel.m.jordan@oracle.com, bob.picco@oracle.com References: <20170920201714.19817-1-pasha.tatashin@oracle.com> <20170920201714.19817-13-pasha.tatashin@oracle.com> <20171003131952.aqq377pjug5me6go@dhcp22.suse.cz> From: Pasha Tatashin Message-ID: Date: Tue, 3 Oct 2017 11:34:25 -0400 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.3.0 MIME-Version: 1.0 In-Reply-To: <20171003131952.aqq377pjug5me6go@dhcp22.suse.cz> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Source-IP: aserv0021.oracle.com [141.146.126.233] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 10/03/2017 09:19 AM, Michal Hocko wrote: > On Wed 20-09-17 16:17:14, Pavel Tatashin wrote: >> vmemmap_alloc_block() will no longer zero the block, so zero memory >> at its call sites for everything except struct pages. Struct page memory >> is zero'd by struct page initialization. >> >> Replace allocators in sprase-vmemmap to use the non-zeroing version. So, >> we will get the performance improvement by zeroing the memory in parallel >> when struct pages are zeroed. > > Is it possible to merge this patch with http://lkml.kernel.org/r/20170920201714.19817-7-pasha.tatashin@oracle.com Yes, I will do that. It would also require re-arranging [PATCH v9 07/12] sparc64: optimized struct page zeroing optimization to come after this patch. Pasha