From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qt0-f199.google.com (mail-qt0-f199.google.com [209.85.216.199]) by kanga.kvack.org (Postfix) with ESMTP id 1EA776B0038 for ; Tue, 3 Oct 2017 11:35:05 -0400 (EDT) Received: by mail-qt0-f199.google.com with SMTP id 37so5262013qto.2 for ; Tue, 03 Oct 2017 08:35:05 -0700 (PDT) Received: from userp1040.oracle.com (userp1040.oracle.com. [156.151.31.81]) by mx.google.com with ESMTPS id q196si4079471qke.194.2017.10.03.08.35.03 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 03 Oct 2017 08:35:04 -0700 (PDT) Subject: Re: [PATCH v9 12/12] mm: stop zeroing memory during allocation in vmemmap 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 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 Sender: owner-linux-mm@kvack.org List-ID: 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 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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org