From patchwork Thu Oct 17 16:42:21 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Song Liu X-Patchwork-Id: 11196391 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 76DB615AB for ; Thu, 17 Oct 2019 16:42:56 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 390D521848 for ; Thu, 17 Oct 2019 16:42:56 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=fb.com header.i=@fb.com header.b="Riq+D40P" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 390D521848 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=fb.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id D75C08E000E; Thu, 17 Oct 2019 12:42:54 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id D00268E0003; Thu, 17 Oct 2019 12:42:54 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id C138C8E000E; Thu, 17 Oct 2019 12:42:54 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0168.hostedemail.com [216.40.44.168]) by kanga.kvack.org (Postfix) with ESMTP id 9EBF48E0003 for ; Thu, 17 Oct 2019 12:42:54 -0400 (EDT) Received: from smtpin04.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with SMTP id 52582812C for ; Thu, 17 Oct 2019 16:42:54 +0000 (UTC) X-FDA: 76053845868.04.house34_53850413c4910 X-Spam-Summary: 2,0,0,1cc70eca1b3b29f1,d41d8cd98f00b204,prvs=51939537e3=songliubraving@fb.com,:linux-kernel@vger.kernel.org::akpm@linux-foundation.org:matthew.wilcox@oracle.com:kernel-team@fb.com:william.kucharski@oracle.com:kirill.shutemov@linux.intel.com:songliubraving@fb.com,RULES_HIT:41:355:379:541:800:960:968:973:988:989:1260:1261:1277:1313:1314:1345:1359:1437:1516:1518:1534:1541:1711:1730:1747:1777:1792:2393:2559:2562:2898:3138:3139:3140:3141:3142:3352:3865:3867:3870:3871:3872:4250:4321:5007:6119:6120:6261:6653:7576:7901:8957:10004:10400:11026:11658:11914:12043:12296:12297:12438:12555:12679:12895:12986:13069:13311:13357:14096:14097:14181:14394:14721:21080:21451:21611:21627:30054:30064:30070,0,RBL:67.231.145.42:@fb.com:.lbl8.mailshell.net-62.2.0.100 64.100.201.201,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:ff,MSBL:0,DNSBL:neutral,Custom_rules:0:0:0,LFtime:2,LUA_SUMMARY:none X-HE-Tag: house34_53850413c4910 X-Filterd-Recvd-Size: 4198 Received: from mx0a-00082601.pphosted.com (mx0a-00082601.pphosted.com [67.231.145.42]) by imf27.hostedemail.com (Postfix) with ESMTP for ; Thu, 17 Oct 2019 16:42:53 +0000 (UTC) Received: from pps.filterd (m0044010.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id x9HGV7PN003295 for ; Thu, 17 Oct 2019 09:42:52 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fb.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-type; s=facebook; bh=owGDN6Bsj2UyeshzZXzK7BiilPxbptNkzY6xDioUKfQ=; b=Riq+D40Pm+iOjGG8YhC7ggyfbrvZi2ZRmWeSLzMbzU1APzgOBEaX0BvjyvdPeizO3E55 E2e5QB7BwMDGXIXl/lJVYL49dw00NpMQXIALwPiJfVAP3F2rvERmpZhTw4nnRPYtumNM Bx/kXibzJTBb+H9dDM0X616Ln4yDgpr0y10= Received: from mail.thefacebook.com (mailout.thefacebook.com [199.201.64.23]) by mx0a-00082601.pphosted.com with ESMTP id 2vp5k0e291-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-SHA384 bits=256 verify=NOT) for ; Thu, 17 Oct 2019 09:42:52 -0700 Received: from 2401:db00:2050:5076:face:0:7:0 (2620:10d:c081:10::13) by mail.thefacebook.com (2620:10d:c081:35::125) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA) id 15.1.1713.5; Thu, 17 Oct 2019 09:42:51 -0700 Received: by devbig006.ftw2.facebook.com (Postfix, from userid 4523) id B620A62E1477; Thu, 17 Oct 2019 09:42:50 -0700 (PDT) Smtp-Origin-Hostprefix: devbig From: Song Liu Smtp-Origin-Hostname: devbig006.ftw2.facebook.com To: , , CC: , , , , Song Liu Smtp-Origin-Cluster: ftw2c04 Subject: [PATCH v2 4/5] mm/thp: allow drop THP from page cache Date: Thu, 17 Oct 2019 09:42:21 -0700 Message-ID: <20191017164223.2762148-5-songliubraving@fb.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20191017164223.2762148-1-songliubraving@fb.com> References: <20191017164223.2762148-1-songliubraving@fb.com> X-FB-Internal: Safe MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.95,1.0.8 definitions=2019-10-17_05:2019-10-17,2019-10-17 signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 spamscore=0 suspectscore=0 bulkscore=0 clxscore=1015 mlxscore=0 mlxlogscore=749 impostorscore=0 priorityscore=1501 phishscore=0 lowpriorityscore=0 malwarescore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-1908290000 definitions=main-1910170149 X-FB-Internal: deliver X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: "Kirill A. Shutemov" Once a THP is added to the page cache, it cannot be dropped via /proc/sys/vm/drop_caches. Fix this issue with proper handling in invalidate_mapping_pages(). Fixes: 99cb0dbd47a1 ("mm,thp: add read-only THP support for (non-shmem) FS") Signed-off-by: Kirill A. Shutemov Tested-by: Song Liu Signed-off-by: Song Liu --- mm/truncate.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/mm/truncate.c b/mm/truncate.c index 8563339041f6..dd9ebc1da356 100644 --- a/mm/truncate.c +++ b/mm/truncate.c @@ -592,6 +592,16 @@ unsigned long invalidate_mapping_pages(struct address_space *mapping, unlock_page(page); continue; } + + /* Take a pin outside pagevec */ + get_page(page); + + /* + * Drop extra pins before trying to invalidate + * the huge page. + */ + pagevec_remove_exceptionals(&pvec); + pagevec_release(&pvec); } ret = invalidate_inode_page(page); @@ -602,6 +612,8 @@ unsigned long invalidate_mapping_pages(struct address_space *mapping, */ if (!ret) deactivate_file_page(page); + if (PageTransHuge(page)) + put_page(page); count += ret; } pagevec_remove_exceptionals(&pvec);