From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 285D2C43457 for ; Fri, 16 Oct 2020 03:05:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D78002087D for ; Fri, 16 Oct 2020 03:05:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1602817525; bh=PKgMNX+8KteQF96qFEtB1MKyx9EewpWQNMl2uQYUp8o=; h=Date:From:To:Subject:In-Reply-To:Reply-To:List-ID:From; b=aLKw9u/OZmpRKOOyLMnXsXEiarcwwqI3tgQSX+fbc+F2UQW7ZC7R/MLDDXkyzW9fm FolxfBHUxy9dyhNlYNsQ49iq3em9JLw0eL/NtV1ALo5JzCi8B8GvFG2g60KXlorByw +YwHTBRZC59UrFwRiFzDpRMQRNQwTBv4aN1k+1C8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2393936AbgJPDFZ (ORCPT ); Thu, 15 Oct 2020 23:05:25 -0400 Received: from mail.kernel.org ([198.145.29.99]:44054 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728261AbgJPDFY (ORCPT ); Thu, 15 Oct 2020 23:05:24 -0400 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 061C220897; Fri, 16 Oct 2020 03:05:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1602817524; bh=PKgMNX+8KteQF96qFEtB1MKyx9EewpWQNMl2uQYUp8o=; h=Date:From:To:Subject:In-Reply-To:From; b=bHKWxpEffcMZV969d6YntZYoGdEhAxerpP3MyytNJMv3K0H1Xk8A2asUEN8tdzZrJ kiDxwLBKnU1d/ufUhXr/Poa5fSf2b3pKEJ4VGuqmK7oFBWQjmXY4xckmhUuQnJq51U tx6YEZsdOFyvHPNZ1rsQ7an77/siMk9zXl0bHFIk= Date: Thu, 15 Oct 2020 20:05:23 -0700 From: Andrew Morton To: akpm@linux-foundation.org, kirill.shutemov@linux.intel.com, mm-commits@vger.kernel.org, torvalds@linux-foundation.org, willy@infradead.org, ying.huang@intel.com Subject: [patch 019/156] mm/filemap: fix page cache removal for arbitrary sized THPs Message-ID: <20201016030523.AL6me_biW%akpm@linux-foundation.org> In-Reply-To: <20201015194043.84cda0c1d6ca2a6847f2384a@linux-foundation.org> User-Agent: s-nail v14.8.16 Precedence: bulk Reply-To: linux-kernel@vger.kernel.org List-ID: X-Mailing-List: mm-commits@vger.kernel.org From: "Matthew Wilcox (Oracle)" Subject: mm/filemap: fix page cache removal for arbitrary sized THPs Patch series "Remove assumptions of THP size". There are a number of places in the VM which assume that a THP is a PMD in size. That's true today, and remains true after this patch series, but this is a prerequisite for switching to arbitrary-sized THPs. thp_nr_pages() still returns either HPAGE_PMD_NR or 1, but will be changed later. This patch (of 11): page_cache_free_page() assumes THPs are PMD_SIZE; fix that assumption. Link: https://lkml.kernel.org/r/20200908195539.25896-1-willy@infradead.org Link: https://lkml.kernel.org/r/20200908195539.25896-2-willy@infradead.org Signed-off-by: Matthew Wilcox (Oracle) Acked-by: Kirill A. Shutemov Cc: Huang Ying Signed-off-by: Andrew Morton --- mm/filemap.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/mm/filemap.c~mm-filemap-fix-page-cache-removal-for-arbitrary-sized-thps +++ a/mm/filemap.c @@ -249,7 +249,7 @@ static void page_cache_free_page(struct freepage(page); if (PageTransHuge(page) && !PageHuge(page)) { - page_ref_sub(page, HPAGE_PMD_NR); + page_ref_sub(page, thp_nr_pages(page)); VM_BUG_ON_PAGE(page_count(page) <= 0, page); } else { put_page(page); _