From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf0-f197.google.com (mail-pf0-f197.google.com [209.85.192.197]) by kanga.kvack.org (Postfix) with ESMTP id 111C56B0343 for ; Fri, 24 Mar 2017 04:51:19 -0400 (EDT) Received: by mail-pf0-f197.google.com with SMTP id c23so15881156pfj.0 for ; Fri, 24 Mar 2017 01:51:19 -0700 (PDT) Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com. [148.163.156.1]) by mx.google.com with ESMTPS id y21si1867988pgi.329.2017.03.24.01.51.16 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 24 Mar 2017 01:51:16 -0700 (PDT) Received: from pps.filterd (m0098410.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.20/8.16.0.20) with SMTP id v2O8imPL006276 for ; Fri, 24 Mar 2017 04:51:16 -0400 Received: from e34.co.us.ibm.com (e34.co.us.ibm.com [32.97.110.152]) by mx0a-001b2d01.pphosted.com with ESMTP id 29cyr5heru-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Fri, 24 Mar 2017 04:51:15 -0400 Received: from localhost by e34.co.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Fri, 24 Mar 2017 02:51:15 -0600 Subject: Re: [v1 0/5] parallelized "struct page" zeroing References: <1490310113-824438-1-git-send-email-pasha.tatashin@oracle.com> From: Christian Borntraeger Date: Fri, 24 Mar 2017 09:51:09 +0100 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 Message-Id: <341568c3-0473-860f-aa20-63723aa40b87@de.ibm.com> Sender: owner-linux-mm@kvack.org List-ID: To: Pavel Tatashin , linux-kernel@vger.kernel.org, sparclinux@vger.kernel.org, linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, linux-s390 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(-) > -- 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