From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750930AbdEERDj (ORCPT ); Fri, 5 May 2017 13:03:39 -0400 Received: from aserp1040.oracle.com ([141.146.126.69]:27288 "EHLO aserp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750734AbdEERDg (ORCPT ); Fri, 5 May 2017 13:03:36 -0400 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 6/9] sparc64: teach sparc not to zero struct pages memory Date: Fri, 5 May 2017 13:03:13 -0400 Message-Id: <1494003796-748672-7-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: userv0022.oracle.com [156.151.31.74] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 SPARC. Signed-off-by: Pavel Tatashin Reviewed-by: Shannon Nelson --- arch/sparc/mm/init_64.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c index c72d070..dae040c 100644 --- a/arch/sparc/mm/init_64.c +++ b/arch/sparc/mm/init_64.c @@ -2546,7 +2546,7 @@ int __meminit vmemmap_populate(unsigned long vstart, unsigned long vend, pte = pmd_val(*pmd); if (!(pte & _PAGE_VALID)) { void *block = vmemmap_alloc_block(PMD_SIZE, node, - true); + VMEMMAP_ZERO); if (!block) return -ENOMEM; -- 1.7.1