From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756801AbdCXIvZ (ORCPT ); Fri, 24 Mar 2017 04:51:25 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:56910 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1756416AbdCXIvR (ORCPT ); Fri, 24 Mar 2017 04:51:17 -0400 Subject: Re: [v1 0/5] parallelized "struct page" zeroing To: Pavel Tatashin , linux-kernel@vger.kernel.org, sparclinux@vger.kernel.org, linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, linux-s390 References: <1490310113-824438-1-git-send-email-pasha.tatashin@oracle.com> From: Christian Borntraeger Date: Fri, 24 Mar 2017 09:51:09 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0 MIME-Version: 1.0 In-Reply-To: <1490310113-824438-1-git-send-email-pasha.tatashin@oracle.com> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 x-cbid: 17032408-0016-0000-0000-0000066EDB01 X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00006839; HX=3.00000240; KW=3.00000007; PH=3.00000004; SC=3.00000206; SDB=6.00838169; UDB=6.00412132; IPR=6.00615932; BA=6.00005234; NDR=6.00000001; ZLA=6.00000005; ZF=6.00000009; ZB=6.00000000; ZP=6.00000000; ZH=6.00000000; ZU=6.00000002; MB=3.00014792; XFM=3.00000013; UTC=2017-03-24 08:51:14 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 17032408-0017-0000-0000-0000386BDD1E Message-Id: <341568c3-0473-860f-aa20-63723aa40b87@de.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2017-03-24_07:,, 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=8.0.1-1702020001 definitions=main-1703240078 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 03/24/2017 12:01 AM, Pavel Tatashin wrote: > When deferred struct page initialization feature is enabled, we get a > performance gain of initializing vmemmap in parallel after other CPUs are > started. However, we still zero the memory for vmemmap using one boot CPU. > This patch-set fixes the memset-zeroing limitation by deferring it as well. > > Here is example performance gain on SPARC with 32T: > base > https://hastebin.com/ozanelatat.go > > fix > https://hastebin.com/utonawukof.go > > As you can see without the fix it takes: 97.89s to boot > With the fix it takes: 46.91 to boot. > > On x86 time saving is going to be even greater (proportionally to memory size) > because there are twice as many "struct page"es for the same amount of memory, > as base pages are twice smaller. Fixing the linux-s390 mailing list email. This might be useful for s390 as well. > > > Pavel Tatashin (5): > sparc64: simplify vmemmap_populate > mm: defining memblock_virt_alloc_try_nid_raw > mm: add "zero" argument to vmemmap allocators > mm: zero struct pages during initialization > mm: teach platforms not to zero struct pages memory > > arch/powerpc/mm/init_64.c | 4 +- > arch/s390/mm/vmem.c | 5 ++- > arch/sparc/mm/init_64.c | 26 +++++++---------------- > arch/x86/mm/init_64.c | 3 +- > include/linux/bootmem.h | 3 ++ > include/linux/mm.h | 15 +++++++++++-- > mm/memblock.c | 46 ++++++++++++++++++++++++++++++++++++------ > mm/page_alloc.c | 3 ++ > mm/sparse-vmemmap.c | 48 +++++++++++++++++++++++++++++--------------- > 9 files changed, 103 insertions(+), 50 deletions(-) >