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=DKIM_INVALID,DKIM_SIGNED, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS autolearn=unavailable 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 B7921C433E0 for ; Sun, 28 Jun 2020 07:02:19 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 1D87720702 for ; Sun, 28 Jun 2020 07:02:19 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="Qm3qqF3d" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1D87720702 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from bilbo.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 49vhQ10ZBWzDr5L for ; Sun, 28 Jun 2020 17:02:17 +1000 (AEST) Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=kernel.org (client-ip=198.145.29.99; helo=mail.kernel.org; envelope-from=rppt@kernel.org; receiver=) Authentication-Results: lists.ozlabs.org; dmarc=pass (p=none dis=none) header.from=kernel.org Authentication-Results: lists.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=default header.b=Qm3qqF3d; dkim-atps=neutral Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 49vhMW6fffzDqNv for ; Sun, 28 Jun 2020 17:00:07 +1000 (AEST) Received: from kernel.org (unknown [87.71.40.38]) (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 D042720702; Sun, 28 Jun 2020 06:59:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1593327604; bh=hu/tW2f/lIs0zzXJSvCrgwdLd0PRG2JIRHvUCcaAjqM=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=Qm3qqF3d78J/gFOwv6YVJb71itb3mymeRhGcaLrkXQY5dETAmGwNnfv+uXEMscIi2 mPZsATFBdJNygr2fnTWo/ejLleXfIjFaiD5KXp/1ygh8w33HlLwG0oN/C/qRCb8sbq bU6JOX1KtJfeNxxfnsJIYZnBX1A1gh84k+HeVxCY= Date: Sun, 28 Jun 2020 09:59:51 +0300 From: Mike Rapoport To: Matthew Wilcox Subject: Re: [PATCH 9/8] mm: Account PMD tables like PTE tables Message-ID: <20200628065951.GB576120@kernel.org> References: <20200627143453.31835-1-rppt@kernel.org> <20200627184642.GF25039@casper.infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200627184642.GF25039@casper.infradead.org> X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-ia64@vger.kernel.org, linux-sh@vger.kernel.org, Peter Zijlstra , linux-mips@vger.kernel.org, Max Filippov , Satheesh Rajendran , linux-csky@vger.kernel.org, sparclinux@vger.kernel.org, linux-riscv@lists.infradead.org, linux-arch@vger.kernel.org, Stephen Rothwell , linux-hexagon@vger.kernel.org, Joerg Roedel , Mike Rapoport , Abdul Haleem , linux-snps-arc@lists.infradead.org, linux-xtensa@linux-xtensa.org, Arnd Bergmann , linux-s390@vger.kernel.org, linux-um@lists.infradead.org, Steven Rostedt , linux-m68k@lists.linux-m68k.org, openrisc@lists.librecores.org, Andy Lutomirski , Stafford Horne , linux-arm-kernel@lists.infradead.org, linux-parisc@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-alpha@vger.kernel.org, Andrew Morton , linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Sat, Jun 27, 2020 at 07:46:42PM +0100, Matthew Wilcox wrote: > We account the PTE level of the page tables to the process in order to > make smarter OOM decisions and help diagnose why memory is fragmented. > For these same reasons, we should account pages allocated for PMDs. > With larger process address spaces and ASLR, the number of PMDs in use > is higher than it used to be so the inaccuracy is starting to matter. > > Signed-off-by: Matthew Wilcox (Oracle) Reviewed-by: Mike Rapoport > --- > include/linux/mm.h | 24 ++++++++++++++++++++---- > 1 file changed, 20 insertions(+), 4 deletions(-) > > diff --git a/include/linux/mm.h b/include/linux/mm.h > index dc7b87310c10..b283e25fcffa 100644 > --- a/include/linux/mm.h > +++ b/include/linux/mm.h > @@ -2271,7 +2271,7 @@ static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd) > return ptlock_ptr(pmd_to_page(pmd)); > } > > -static inline bool pgtable_pmd_page_ctor(struct page *page) > +static inline bool pmd_ptlock_init(struct page *page) > { > #ifdef CONFIG_TRANSPARENT_HUGEPAGE > page->pmd_huge_pte = NULL; > @@ -2279,7 +2279,7 @@ static inline bool pgtable_pmd_page_ctor(struct page *page) > return ptlock_init(page); > } > > -static inline void pgtable_pmd_page_dtor(struct page *page) > +static inline void pmd_ptlock_free(struct page *page) > { > #ifdef CONFIG_TRANSPARENT_HUGEPAGE > VM_BUG_ON_PAGE(page->pmd_huge_pte, page); > @@ -2296,8 +2296,8 @@ static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd) > return &mm->page_table_lock; > } > > -static inline bool pgtable_pmd_page_ctor(struct page *page) { return true; } > -static inline void pgtable_pmd_page_dtor(struct page *page) {} > +static inline bool pmd_ptlock_init(struct page *page) { return true; } > +static inline void pmd_ptlock_free(struct page *page) {} > > #define pmd_huge_pte(mm, pmd) ((mm)->pmd_huge_pte) > > @@ -2310,6 +2310,22 @@ static inline spinlock_t *pmd_lock(struct mm_struct *mm, pmd_t *pmd) > return ptl; > } > > +static inline bool pgtable_pmd_page_ctor(struct page *page) > +{ > + if (!pmd_ptlock_init(page)) > + return false; > + __SetPageTable(page); > + inc_zone_page_state(page, NR_PAGETABLE); > + return true; > +} > + > +static inline void pgtable_pmd_page_dtor(struct page *page) > +{ > + pmd_ptlock_free(page); > + __ClearPageTable(page); > + dec_zone_page_state(page, NR_PAGETABLE); > +} > + > /* > * No scalability reason to split PUD locks yet, but follow the same pattern > * as the PMD locks to make it easier if we decide to. The VM should not be > -- > 2.27.0 > -- Sincerely yours, Mike.