From patchwork Sat Oct 19 03:20:33 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrew Morton X-Patchwork-Id: 11199915 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 A1EE314E5 for ; Sat, 19 Oct 2019 03:20:37 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 6535D2246F for ; Sat, 19 Oct 2019 03:20:37 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="JHa4Jj6+" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6535D2246F Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linux-foundation.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 5B3938E001C; Fri, 18 Oct 2019 23:20:36 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 58D4E8E0003; Fri, 18 Oct 2019 23:20:36 -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 47B858E001C; Fri, 18 Oct 2019 23:20:36 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0133.hostedemail.com [216.40.44.133]) by kanga.kvack.org (Postfix) with ESMTP id 268EE8E0003 for ; Fri, 18 Oct 2019 23:20:36 -0400 (EDT) Received: from smtpin06.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with SMTP id C48F14DAB for ; Sat, 19 Oct 2019 03:20:35 +0000 (UTC) X-FDA: 76059081630.06.year63_2245f0e233811 X-Spam-Summary: 75,0,0,0fdc30097090097c,d41d8cd98f00b204,akpm@linux-foundation.org,:akpm@linux-foundation.org:kirill.shutemov@linux.intel.com::mm-commits@vger.kernel.org:oleg@redhat.com:songliubraving@fb.com:srikar@linux.vnet.ibm.com:torvalds@linux-foundation.org:william.kucharski@oracle.com:willy@infradead.org:yang.shi@linux.alibaba.com,RULES_HIT:41:355:379:800:960:966:967:968:973:988:989:1260:1263:1345:1381:1431:1437:1534:1541:1711:1730:1747:1777:1792:2196:2198:2199:2200:2393:2525:2559:2563:2682:2685:2859:2902:2933:2937:2939:2942:2945:2947:2951:2954:3022:3138:3139:3140:3141:3142:3352:3608:3865:3868:3870:3871:3872:3874:3934:3936:3938:3941:3944:3947:3950:3953:3956:3959:4250:4321:4385:5007:6119:6261:6653:6737:7576:8599:8603:8957:9025:9545:10004:10913:11026:11473:11658:11914:12043:12048:12296:12297:12517:12519:12555:12679:12783:12986:13069:13141:13230:13311:13357:14181:14384:14721:14849:21060:21080:21451:21627:21939:30054:30064,0,RBL:error,CacheIP:none,Bayesian:0.5,0.5,0.5,Netc heck:non X-HE-Tag: year63_2245f0e233811 X-Filterd-Recvd-Size: 2931 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf06.hostedemail.com (Postfix) with ESMTP for ; Sat, 19 Oct 2019 03:20:35 +0000 (UTC) Received: from localhost.localdomain (c-73-231-172-41.hsd1.ca.comcast.net [73.231.172.41]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 245AB22466; Sat, 19 Oct 2019 03:20:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1571455234; bh=8fdK13+Ge69/dgH2WuPaPi/1WyYhuEBEgZXCAR7KBhQ=; h=Date:From:To:Subject:From; b=JHa4Jj6+iooFRzhgD+hILFv26opuu8m7MMNCHmifPP3hWLJGRCRuPD6wEArNYUnkS YeBuElMaex+WmtzmDBshNIPp4Z5jspub/RlUWelEa3+RHLK8hKtIefkPwJVtNmFYWE 7ZtZlnq/Gyg/BRthiEAfFxkf1wsUFC0Pe69s08+I= Date: Fri, 18 Oct 2019 20:20:33 -0700 From: akpm@linux-foundation.org To: akpm@linux-foundation.org, kirill.shutemov@linux.intel.com, linux-mm@kvack.org, mm-commits@vger.kernel.org, oleg@redhat.com, songliubraving@fb.com, srikar@linux.vnet.ibm.com, torvalds@linux-foundation.org, william.kucharski@oracle.com, willy@infradead.org, yang.shi@linux.alibaba.com Subject: [patch 23/26] mm/vmscan.c: support removing arbitrary sized pages from mapping Message-ID: <20191019032033.Hwaxo9LQB%akpm@linux-foundation.org> User-Agent: s-nail v14.8.16 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: William Kucharski Subject: mm/vmscan.c: support removing arbitrary sized pages from mapping __remove_mapping() assumes that pages can only be either base pages or HPAGE_PMD_SIZE. Ask the page what size it is. Link: http://lkml.kernel.org/r/20191017164223.2762148-4-songliubraving@fb.com Fixes: 99cb0dbd47a1 ("mm,thp: add read-only THP support for (non-shmem) FS") Signed-off-by: William Kucharski Signed-off-by: Matthew Wilcox (Oracle) Signed-off-by: Song Liu Acked-by: Yang Shi Cc: "Kirill A. Shutemov" Cc: Oleg Nesterov Cc: Srikar Dronamraju Signed-off-by: Andrew Morton --- mm/vmscan.c | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-) --- a/mm/vmscan.c~mm-support-removing-arbitrary-sized-pages-from-mapping +++ a/mm/vmscan.c @@ -933,10 +933,7 @@ static int __remove_mapping(struct addre * Note that if SetPageDirty is always performed via set_page_dirty, * and thus under the i_pages lock, then this ordering is not required. */ - if (unlikely(PageTransHuge(page)) && PageSwapCache(page)) - refcount = 1 + HPAGE_PMD_NR; - else - refcount = 2; + refcount = 1 + compound_nr(page); if (!page_ref_freeze(page, refcount)) goto cannot_free; /* note: atomic_cmpxchg in page_ref_freeze provides the smp_rmb */