From patchwork Wed Aug 23 13:13:25 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexandru Elisei X-Patchwork-Id: 13362322 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B675AEE4993 for ; Wed, 23 Aug 2023 13:16:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235624AbjHWNQ3 (ORCPT ); Wed, 23 Aug 2023 09:16:29 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33348 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235612AbjHWNQR (ORCPT ); Wed, 23 Aug 2023 09:16:17 -0400 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 3368C1704; Wed, 23 Aug 2023 06:15:54 -0700 (PDT) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 91C481650; Wed, 23 Aug 2023 06:16:04 -0700 (PDT) Received: from e121798.cable.virginm.net (unknown [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 4AFC03F740; Wed, 23 Aug 2023 06:15:18 -0700 (PDT) From: Alexandru Elisei To: catalin.marinas@arm.com, will@kernel.org, oliver.upton@linux.dev, maz@kernel.org, james.morse@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, arnd@arndb.de, akpm@linux-foundation.org, mingo@redhat.com, peterz@infradead.org, juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, bristot@redhat.com, vschneid@redhat.com, mhiramat@kernel.org, rppt@kernel.org, hughd@google.com Cc: pcc@google.com, steven.price@arm.com, anshuman.khandual@arm.com, vincenzo.frascino@arm.com, david@redhat.com, eugenis@google.com, kcc@google.com, hyesoo.yu@samsung.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, kvmarm@lists.linux.dev, linux-fsdevel@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, linux-trace-kernel@vger.kernel.org Subject: [PATCH RFC 12/37] mm: gup: Don't allow longterm pinning of MIGRATE_METADATA pages Date: Wed, 23 Aug 2023 14:13:25 +0100 Message-Id: <20230823131350.114942-13-alexandru.elisei@arm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230823131350.114942-1-alexandru.elisei@arm.com> References: <20230823131350.114942-1-alexandru.elisei@arm.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-trace-kernel@vger.kernel.org Treat MIGRATE_METADATA pages just like movable or CMA pages and don't allow them to be pinned longterm. No special handling needed for migrate_longterm_unpinnable_pages() because the gfp mask for allocating the destination pages is GFP_USER. GFP_USER doesn't include __GFP_MOVABLE, which makes it impossible to accidently allocate metadata pages for migrating the pinned pages. Signed-off-by: Alexandru Elisei --- include/linux/mm.h | 10 +++++++--- mm/Kconfig | 2 ++ 2 files changed, 9 insertions(+), 3 deletions(-) diff --git a/include/linux/mm.h b/include/linux/mm.h index 2dd73e4f3d8e..ce87d55ecf87 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1925,16 +1925,20 @@ static inline bool is_zero_folio(const struct folio *folio) return is_zero_page(&folio->page); } -/* MIGRATE_CMA and ZONE_MOVABLE do not allow pin folios */ +/* MIGRATE_CMA, MIGRATE_METADATA and ZONE_MOVABLE do not allow pin folios */ #ifdef CONFIG_MIGRATION static inline bool folio_is_longterm_pinnable(struct folio *folio) { -#ifdef CONFIG_CMA +#if defined(CONFIG_CMA) || defined(CONFIG_MEMORY_METADATA) int mt = folio_migratetype(folio); - if (mt == MIGRATE_CMA || mt == MIGRATE_ISOLATE) + if (mt == MIGRATE_ISOLATE) + return false; + + if (is_migrate_cma(mt) || is_migrate_metadata(mt)) return false; #endif + /* The zero page can be "pinned" but gets special handling. */ if (is_zero_folio(folio)) return true; diff --git a/mm/Kconfig b/mm/Kconfig index 838193522e20..847e1669dba0 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -1238,6 +1238,8 @@ config LOCK_MM_AND_FIND_VMA config MEMORY_METADATA bool + select MEMORY_ISOLATION + select MIGRATION source "mm/damon/Kconfig"