From patchwork Thu May 7 00:42:05 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anthony Yznaga X-Patchwork-Id: 11532205 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 0D008139F for ; Thu, 7 May 2020 00:46:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E6B922082E for ; Thu, 7 May 2020 00:46:08 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="vm1xGfzf" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728884AbgEGAqH (ORCPT ); Wed, 6 May 2020 20:46:07 -0400 Received: from aserp2120.oracle.com ([141.146.126.78]:38868 "EHLO aserp2120.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728868AbgEGAqF (ORCPT ); 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Thu, 7 May 2020 00:44:55 GMT Received: from aserv0122.oracle.com (aserv0122.oracle.com [141.146.126.236]) by userp3020.oracle.com with ESMTP id 30us7p2pnn-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 07 May 2020 00:44:55 +0000 Received: from abhmp0014.oracle.com (abhmp0014.oracle.com [141.146.116.20]) by aserv0122.oracle.com (8.14.4/8.14.4) with ESMTP id 0470irBD020628; Thu, 7 May 2020 00:44:53 GMT Received: from ayz-linux.localdomain (/68.7.158.207) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Wed, 06 May 2020 17:44:53 -0700 From: Anthony Yznaga To: linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: willy@infradead.org, corbet@lwn.net, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, rppt@linux.ibm.com, akpm@linux-foundation.org, hughd@google.com, ebiederm@xmission.com, masahiroy@kernel.org, ardb@kernel.org, ndesaulniers@google.com, dima@golovin.in, daniel.kiper@oracle.com, nivedita@alum.mit.edu, rafael.j.wysocki@intel.com, dan.j.williams@intel.com, zhenzhong.duan@oracle.com, jroedel@suse.de, bhe@redhat.com, guro@fb.com, Thomas.Lendacky@amd.com, andriy.shevchenko@linux.intel.com, keescook@chromium.org, hannes@cmpxchg.org, minchan@kernel.org, mhocko@kernel.org, ying.huang@intel.com, yang.shi@linux.alibaba.com, gustavo@embeddedor.com, ziqian.lzq@antfin.com, vdavydov.dev@gmail.com, jason.zeng@intel.com, kevin.tian@intel.com, zhiyuan.lv@intel.com, lei.l.li@intel.com, paul.c.lai@intel.com, ashok.raj@intel.com, linux-fsdevel@vger.kernel.org, linux-doc@vger.kernel.org, kexec@lists.infradead.org Subject: [RFC 39/43] shmem: optimize adding pages to the LRU in shmem_insert_pages() Date: Wed, 6 May 2020 17:42:05 -0700 Message-Id: <1588812129-8596-40-git-send-email-anthony.yznaga@oracle.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1588812129-8596-1-git-send-email-anthony.yznaga@oracle.com> References: <1588812129-8596-1-git-send-email-anthony.yznaga@oracle.com> X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9613 signatures=668687 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 bulkscore=0 adultscore=0 suspectscore=0 mlxlogscore=999 malwarescore=0 phishscore=0 mlxscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2005070001 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9613 signatures=668687 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 impostorscore=0 mlxscore=0 priorityscore=1501 lowpriorityscore=0 malwarescore=0 clxscore=1015 mlxlogscore=999 spamscore=0 adultscore=0 bulkscore=0 phishscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2005070001 Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Reduce LRU lock contention when inserting shmem pages by staging pages to be added to the same LRU and adding them en masse. Signed-off-by: Anthony Yznaga --- mm/shmem.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/mm/shmem.c b/mm/shmem.c index ca5edf580f24..678a396ba8d3 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -789,9 +789,12 @@ int shmem_insert_pages(struct mm_struct *mm, struct inode *inode, pgoff_t index, struct shmem_sb_info *sbinfo = SHMEM_SB(inode->i_sb); gfp_t gfp = mapping_gfp_mask(mapping); struct mem_cgroup *memcg; + struct lru_splice splice; int i, err; int nr = 0; + memset(&splice, 0, sizeof(splice)); + for (i = 0; i < npages; i++) nr += compound_nr(pages[i]); @@ -866,7 +869,7 @@ int shmem_insert_pages(struct mm_struct *mm, struct inode *inode, pgoff_t index, } if (!PageLRU(pages[i])) - lru_cache_add_anon(pages[i]); + lru_splice_add_anon(pages[i], &splice); flush_dcache_page(pages[i]); SetPageUptodate(pages[i]); @@ -875,6 +878,9 @@ int shmem_insert_pages(struct mm_struct *mm, struct inode *inode, pgoff_t index, unlock_page(pages[i]); } + if (splice.pgdat) + add_splice_to_lru_list(&splice); + return 0; out_truncate: