From patchwork Fri May 5 17:03:16 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pavel Tatashin X-Patchwork-Id: 759102 Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3wKJH001wDz9s7r for ; Sat, 6 May 2017 03:07:24 +1000 (AEST) Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 3wKJGz6JVgzDqHW for ; Sat, 6 May 2017 03:07:23 +1000 (AEST) X-Original-To: linuxppc-dev@lists.ozlabs.org Delivered-To: linuxppc-dev@lists.ozlabs.org Received: from aserp1040.oracle.com (aserp1040.oracle.com [141.146.126.69]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 3wKJBb0g8HzDqCL for ; Sat, 6 May 2017 03:03:34 +1000 (AEST) Received: from aserv0021.oracle.com (aserv0021.oracle.com [141.146.126.233]) by aserp1040.oracle.com (Sentrion-MTA-4.3.2/Sentrion-MTA-4.3.2) with ESMTP id v45H3SHr008822 (version=TLSv1 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Fri, 5 May 2017 17:03:28 GMT Received: from userv0121.oracle.com (userv0121.oracle.com [156.151.31.72]) by aserv0021.oracle.com (8.13.8/8.14.4) with ESMTP id v45H3RIx018044 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Fri, 5 May 2017 17:03:28 GMT Received: from abhmp0010.oracle.com (abhmp0010.oracle.com [141.146.116.16]) by userv0121.oracle.com (8.14.4/8.13.8) with ESMTP id v45H3R0Y009849; Fri, 5 May 2017 17:03:27 GMT Received: from ca-ldom103.us.oracle.com (/10.129.68.23) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Fri, 05 May 2017 10:03:27 -0700 From: Pavel Tatashin To: linux-kernel@vger.kernel.org, sparclinux@vger.kernel.org, linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, borntraeger@de.ibm.com, heiko.carstens@de.ibm.com, davem@davemloft.net Subject: [v3 9/9] s390: teach platforms not to zero struct pages memory Date: Fri, 5 May 2017 13:03:16 -0400 Message-Id: <1494003796-748672-10-git-send-email-pasha.tatashin@oracle.com> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1494003796-748672-1-git-send-email-pasha.tatashin@oracle.com> References: <1494003796-748672-1-git-send-email-pasha.tatashin@oracle.com> X-Source-IP: aserv0021.oracle.com [141.146.126.233] X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" If we are using deferred struct page initialization feature, most of "struct page"es are getting initialized after other CPUs are started, and hence we are benefiting from doing this job in parallel. However, we are still zeroing all the memory that is allocated for "struct pages" using the boot CPU. This patch solves this problem, by deferring zeroing "struct pages" to only when they are initialized on s390 platforms. Signed-off-by: Pavel Tatashin Reviewed-by: Shannon Nelson --- arch/s390/mm/vmem.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/arch/s390/mm/vmem.c b/arch/s390/mm/vmem.c index 9c75214..ffe9ba1 100644 --- a/arch/s390/mm/vmem.c +++ b/arch/s390/mm/vmem.c @@ -252,7 +252,7 @@ int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node) void *new_page; new_page = vmemmap_alloc_block(PMD_SIZE, node, - true); + VMEMMAP_ZERO); if (!new_page) goto out; pmd_val(*pm_dir) = __pa(new_page) | sgt_prot;