From patchwork Mon Aug 7 20:38:43 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pavel Tatashin X-Patchwork-Id: 798868 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=sparclinux-owner@vger.kernel.org; receiver=) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 3xR8bR40LYz9rxl for ; Tue, 8 Aug 2017 06:42:11 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752268AbdHGUl6 (ORCPT ); Mon, 7 Aug 2017 16:41:58 -0400 Received: from userp1040.oracle.com ([156.151.31.81]:42189 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752126AbdHGUki (ORCPT ); Mon, 7 Aug 2017 16:40:38 -0400 Received: from userv0021.oracle.com (userv0021.oracle.com [156.151.31.71]) by userp1040.oracle.com (Sentrion-MTA-4.3.2/Sentrion-MTA-4.3.2) with ESMTP id v77Kd4ST031033 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 7 Aug 2017 20:39:04 GMT Received: from aserv0122.oracle.com (aserv0122.oracle.com [141.146.126.236]) by userv0021.oracle.com (8.14.4/8.14.4) with ESMTP id v77Kd3Lr032229 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 7 Aug 2017 20:39:04 GMT Received: from abhmp0007.oracle.com (abhmp0007.oracle.com [141.146.116.13]) by aserv0122.oracle.com (8.14.4/8.14.4) with ESMTP id v77Kd3J3031464; Mon, 7 Aug 2017 20:39:03 GMT Received: from ca-ldom-ol-build-1.us.oracle.com (/10.129.68.23) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Mon, 07 Aug 2017 13:39:02 -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, linux-arm-kernel@lists.infradead.org, x86@kernel.org, kasan-dev@googlegroups.com, borntraeger@de.ibm.com, heiko.carstens@de.ibm.com, davem@davemloft.net, willy@infradead.org, mhocko@kernel.org, ard.biesheuvel@linaro.org, will.deacon@arm.com, catalin.marinas@arm.com, sam@ravnborg.org Subject: [v6 09/15] sparc64: optimized struct page zeroing Date: Mon, 7 Aug 2017 16:38:43 -0400 Message-Id: <1502138329-123460-10-git-send-email-pasha.tatashin@oracle.com> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1502138329-123460-1-git-send-email-pasha.tatashin@oracle.com> References: <1502138329-123460-1-git-send-email-pasha.tatashin@oracle.com> X-Source-IP: userv0021.oracle.com [156.151.31.71] Sender: sparclinux-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: sparclinux@vger.kernel.org Add an optimized mm_zero_struct_page(), so struct page's are zeroed without calling memset(). We do eight to tent regular stores based on the size of struct page. Compiler optimizes out the conditions of switch() statement. Signed-off-by: Pavel Tatashin Reviewed-by: Steven Sistare Reviewed-by: Daniel Jordan Reviewed-by: Bob Picco --- arch/sparc/include/asm/pgtable_64.h | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/arch/sparc/include/asm/pgtable_64.h b/arch/sparc/include/asm/pgtable_64.h index 6fbd931f0570..cee5cc7ccc51 100644 --- a/arch/sparc/include/asm/pgtable_64.h +++ b/arch/sparc/include/asm/pgtable_64.h @@ -230,6 +230,36 @@ extern unsigned long _PAGE_ALL_SZ_BITS; extern struct page *mem_map_zero; #define ZERO_PAGE(vaddr) (mem_map_zero) +/* This macro must be updated when the size of struct page grows above 80 + * or reduces below 64. + * The idea that compiler optimizes out switch() statement, and only + * leaves clrx instructions + */ +#define mm_zero_struct_page(pp) do { \ + unsigned long *_pp = (void *)(pp); \ + \ + /* Check that struct page is either 64, 72, or 80 bytes */ \ + BUILD_BUG_ON(sizeof(struct page) & 7); \ + BUILD_BUG_ON(sizeof(struct page) < 64); \ + BUILD_BUG_ON(sizeof(struct page) > 80); \ + \ + switch (sizeof(struct page)) { \ + case 80: \ + _pp[9] = 0; /* fallthrough */ \ + case 72: \ + _pp[8] = 0; /* fallthrough */ \ + default: \ + _pp[7] = 0; \ + _pp[6] = 0; \ + _pp[5] = 0; \ + _pp[4] = 0; \ + _pp[3] = 0; \ + _pp[2] = 0; \ + _pp[1] = 0; \ + _pp[0] = 0; \ + } \ +} while (0) + /* PFNs are real physical page numbers. However, mem_map only begins to record * per-page information starting at pfn_base. This is to handle systems where * the first physical page in the machine is at some huge physical address,