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GET /api/patches/813989/?format=api
{ "id": 813989, "url": "http://patchwork.ozlabs.org/api/patches/813989/?format=api", "web_url": "http://patchwork.ozlabs.org/project/sparclinux/patch/20170914223517.8242-8-pasha.tatashin@oracle.com/", "project": { "id": 10, "url": "http://patchwork.ozlabs.org/api/projects/10/?format=api", "name": "Linux SPARC Development ", "link_name": "sparclinux", "list_id": "sparclinux.vger.kernel.org", "list_email": "sparclinux@vger.kernel.org", "web_url": null, "scm_url": null, "webscm_url": null, "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20170914223517.8242-8-pasha.tatashin@oracle.com>", "list_archive_url": null, "date": "2017-09-14T22:35:13", "name": "[v8,07/11] sparc64: optimized struct page zeroing", "commit_ref": null, "pull_url": null, "state": "not-applicable", "archived": false, "hash": "e491f76dd863cd259f8b65b312e161bde30fdecc", "submitter": { "id": 71010, "url": "http://patchwork.ozlabs.org/api/people/71010/?format=api", "name": "Pavel Tatashin", "email": "pasha.tatashin@oracle.com" }, "delegate": { "id": 34, "url": "http://patchwork.ozlabs.org/api/users/34/?format=api", "username": "davem", "first_name": "David", "last_name": "Miller", "email": "davem@davemloft.net" }, "mbox": "http://patchwork.ozlabs.org/project/sparclinux/patch/20170914223517.8242-8-pasha.tatashin@oracle.com/mbox/", "series": [ { "id": 3172, "url": "http://patchwork.ozlabs.org/api/series/3172/?format=api", "web_url": "http://patchwork.ozlabs.org/project/sparclinux/list/?series=3172", "date": "2017-09-14T22:35:07", "name": "complete deferred page initialization", "version": 8, "mbox": "http://patchwork.ozlabs.org/series/3172/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/813989/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/813989/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<sparclinux-owner@vger.kernel.org>", "X-Original-To": "patchwork-incoming@ozlabs.org", "Delivered-To": "patchwork-incoming@ozlabs.org", "Authentication-Results": "ozlabs.org;\n\tspf=none (mailfrom) smtp.mailfrom=vger.kernel.org\n\t(client-ip=209.132.180.67; helo=vger.kernel.org;\n\tenvelope-from=sparclinux-owner@vger.kernel.org;\n\treceiver=<UNKNOWN>)", "Received": [ "from vger.kernel.org (vger.kernel.org [209.132.180.67])\n\tby ozlabs.org (Postfix) with ESMTP id 3xtYQF29V7z9s5L\n\tfor <patchwork-incoming@ozlabs.org>;\n\tFri, 15 Sep 2017 08:40:21 +1000 (AEST)", "(majordomo@vger.kernel.org) by vger.kernel.org via listexpand\n\tid S1751364AbdINWj0 (ORCPT <rfc822;patchwork-incoming@ozlabs.org>);\n\tThu, 14 Sep 2017 18:39:26 -0400", "from userp1040.oracle.com ([156.151.31.81]:44266 \"EHLO\n\tuserp1040.oracle.com\" rhost-flags-OK-OK-OK-OK) by vger.kernel.org\n\twith ESMTP id S1751323AbdINWjZ (ORCPT\n\t<rfc822; sparclinux@vger.kernel.org>); Thu, 14 Sep 2017 18:39:25 -0400", "from userv0021.oracle.com (userv0021.oracle.com [156.151.31.71])\n\tby userp1040.oracle.com (Sentrion-MTA-4.3.2/Sentrion-MTA-4.3.2) with\n\tESMTP id v8EMZatV030147\n\t(version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256\n\tverify=OK); Thu, 14 Sep 2017 22:35:37 GMT", "from aserv0121.oracle.com (aserv0121.oracle.com [141.146.126.235])\n\tby userv0021.oracle.com (8.14.4/8.14.4) with ESMTP id\n\tv8EMZaI4029453\n\t(version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256\n\tverify=OK); Thu, 14 Sep 2017 22:35:36 GMT", "from ubhmp0003.oracle.com (ubhmp0003.oracle.com [156.151.24.56])\n\tby aserv0121.oracle.com (8.14.4/8.13.8) with ESMTP id v8EMZZSc024769; \n\tThu, 14 Sep 2017 22:35:35 GMT", "from cmex.localdomain (/12.145.98.253)\n\tby default (Oracle Beehive Gateway v4.0)\n\twith ESMTP ; Thu, 14 Sep 2017 22:35:34 +0000" ], "From": "Pavel Tatashin <pasha.tatashin@oracle.com>", "To": "linux-kernel@vger.kernel.org, sparclinux@vger.kernel.org,\n\tlinux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org,\n\tlinux-s390@vger.kernel.org, linux-arm-kernel@lists.infradead.org,\n\tx86@kernel.org, kasan-dev@googlegroups.com, borntraeger@de.ibm.com,\n\theiko.carstens@de.ibm.com, davem@davemloft.net,\n\twilly@infradead.org, mhocko@kernel.org, ard.biesheuvel@linaro.org,\n\twill.deacon@arm.com, catalin.marinas@arm.com, sam@ravnborg.org,\n\tmgorman@techsingularity.net, Steven.Sistare@oracle.com,\n\tdaniel.m.jordan@oracle.com, bob.picco@oracle.com", "Subject": "[PATCH v8 07/11] sparc64: optimized struct page zeroing", "Date": "Thu, 14 Sep 2017 18:35:13 -0400", "Message-Id": "<20170914223517.8242-8-pasha.tatashin@oracle.com>", "X-Mailer": "git-send-email 2.14.1", "In-Reply-To": "<20170914223517.8242-1-pasha.tatashin@oracle.com>", "References": "<20170914223517.8242-1-pasha.tatashin@oracle.com>", "X-Source-IP": "userv0021.oracle.com [156.151.31.71]", "Sender": "sparclinux-owner@vger.kernel.org", "Precedence": "bulk", "List-ID": "<sparclinux.vger.kernel.org>", "X-Mailing-List": "sparclinux@vger.kernel.org" }, "content": "Add an optimized mm_zero_struct_page(), so struct page's are zeroed without\ncalling memset(). We do eight to ten regular stores based on the size of\nstruct page. Compiler optimizes out the conditions of switch() statement.\n\nSPARC-M6 with 15T of memory, single thread performance:\n\n BASE FIX OPTIMIZED_FIX\n bootmem_init 28.440467985s 2.305674818s 2.305161615s\nfree_area_init_nodes 202.845901673s 225.343084508s 172.556506560s\n --------------------------------------------\nTotal 231.286369658s 227.648759326s 174.861668175s\n\nBASE: current linux\nFIX: This patch series without \"optimized struct page zeroing\"\nOPTIMIZED_FIX: This patch series including the current patch.\n\nbootmem_init() is where memory for struct pages is zeroed during\nallocation. Note, about two seconds in this function is a fixed time: it\ndoes not increase as memory is increased.\n\nSigned-off-by: Pavel Tatashin <pasha.tatashin@oracle.com>\nReviewed-by: Steven Sistare <steven.sistare@oracle.com>\nReviewed-by: Daniel Jordan <daniel.m.jordan@oracle.com>\nReviewed-by: Bob Picco <bob.picco@oracle.com>\nAcked-by: David S. Miller <davem@davemloft.net>\n---\n arch/sparc/include/asm/pgtable_64.h | 30 ++++++++++++++++++++++++++++++\n 1 file changed, 30 insertions(+)", "diff": "diff --git a/arch/sparc/include/asm/pgtable_64.h b/arch/sparc/include/asm/pgtable_64.h\nindex 4fefe3762083..8ed478abc630 100644\n--- a/arch/sparc/include/asm/pgtable_64.h\n+++ b/arch/sparc/include/asm/pgtable_64.h\n@@ -230,6 +230,36 @@ extern unsigned long _PAGE_ALL_SZ_BITS;\n extern struct page *mem_map_zero;\n #define ZERO_PAGE(vaddr)\t(mem_map_zero)\n \n+/* This macro must be updated when the size of struct page grows above 80\n+ * or reduces below 64.\n+ * The idea that compiler optimizes out switch() statement, and only\n+ * leaves clrx instructions\n+ */\n+#define\tmm_zero_struct_page(pp) do {\t\t\t\t\t\\\n+\tunsigned long *_pp = (void *)(pp);\t\t\t\t\\\n+\t\t\t\t\t\t\t\t\t\\\n+\t /* Check that struct page is either 64, 72, or 80 bytes */\t\\\n+\tBUILD_BUG_ON(sizeof(struct page) & 7);\t\t\t\t\\\n+\tBUILD_BUG_ON(sizeof(struct page) < 64);\t\t\t\t\\\n+\tBUILD_BUG_ON(sizeof(struct page) > 80);\t\t\t\t\\\n+\t\t\t\t\t\t\t\t\t\\\n+\tswitch (sizeof(struct page)) {\t\t\t\t\t\\\n+\tcase 80:\t\t\t\t\t\t\t\\\n+\t\t_pp[9] = 0;\t/* fallthrough */\t\t\t\\\n+\tcase 72:\t\t\t\t\t\t\t\\\n+\t\t_pp[8] = 0;\t/* fallthrough */\t\t\t\\\n+\tdefault:\t\t\t\t\t\t\t\\\n+\t\t_pp[7] = 0;\t\t\t\t\t\t\\\n+\t\t_pp[6] = 0;\t\t\t\t\t\t\\\n+\t\t_pp[5] = 0;\t\t\t\t\t\t\\\n+\t\t_pp[4] = 0;\t\t\t\t\t\t\\\n+\t\t_pp[3] = 0;\t\t\t\t\t\t\\\n+\t\t_pp[2] = 0;\t\t\t\t\t\t\\\n+\t\t_pp[1] = 0;\t\t\t\t\t\t\\\n+\t\t_pp[0] = 0;\t\t\t\t\t\t\\\n+\t}\t\t\t\t\t\t\t\t\\\n+} while (0)\n+\n /* PFNs are real physical page numbers. However, mem_map only begins to record\n * per-page information starting at pfn_base. This is to handle systems where\n * the first physical page in the machine is at some huge physical address,\n", "prefixes": [ "v8", "07/11" ] }