From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf1-f200.google.com (mail-pf1-f200.google.com [209.85.210.200]) by kanga.kvack.org (Postfix) with ESMTP id 2D0068E0001 for ; Wed, 26 Sep 2018 19:29:11 -0400 (EDT) Received: by mail-pf1-f200.google.com with SMTP id u13-v6so746280pfm.8 for ; Wed, 26 Sep 2018 16:29:11 -0700 (PDT) Received: from mga12.intel.com (mga12.intel.com. [192.55.52.136]) by mx.google.com with ESMTPS id d7-v6si360746pln.68.2018.09.26.16.29.09 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 26 Sep 2018 16:29:09 -0700 (PDT) Subject: [RFC mm PATCH 0/5] mm: Deferred page init improvements From: Alexander Duyck Date: Wed, 26 Sep 2018 16:28:20 -0700 Message-ID: <20180926232117.17365.72207.stgit@localhost.localdomain> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: sparclinux@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: pavel.tatashin@microsoft.com, mhocko@suse.com, dave.jiang@intel.com, alexander.h.duyck@linux.intel.com, dan.j.williams@intel.com, willy@infradead.org, mingo@kernel.org, khalid.aziz@oracle.com, rppt@linux.vnet.ibm.com, vbabka@suse.cz, akpm@linux-foundation.org, ldufour@linux.vnet.ibm.com, davem@davemloft.net, kirill.shutemov@linux.intel.com This patchset is essentially a refactor of the page initialization logic to provide for better code reuse while providing a significant improvement in deferred page initialization performance. In my testing I have seen a 3:1 reduction in the time needed for deferred memory initialization on two different x86_64 based test systems I have. In addition this provides a very slight improvement for the hotplug memory initialization, although the improvement doesn't exceed 5% from what I can tell and that is to be expected since most of the changes related to hotplug initialization are just code clean-up to allow for reuse. I had been considering using a large memset for the entire pageblock I was initializing which showed a significant speedup for persistent memory init however that showed no improvements to a slight regression for regular deferred initialization of standard memory. --- Alexander Duyck (5): mm: Use mm_zero_struct_page from SPARC on all 64b architectures mm: Drop meminit_pfn_in_nid as it is redundant mm: Use memblock/zone specific iterator for handling deferred page init mm: Move hot-plug specific memory init into separate functions and optimize mm: Use common iterator for deferred_init_pages and deferred_free_pages arch/sparc/include/asm/pgtable_64.h | 30 -- include/linux/memblock.h | 58 ++++ include/linux/mm.h | 33 ++ mm/memblock.c | 63 ++++ mm/page_alloc.c | 555 +++++++++++++++++++++-------------- 5 files changed, 485 insertions(+), 254 deletions(-) --