From patchwork Thu Jan 25 16:42:24 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexandru Elisei X-Patchwork-Id: 13531290 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id E897FC4828A for ; Thu, 25 Jan 2024 16:43:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=43EJ4ksG92xRScLObdLk9fJm+PjnDI7qB7FJ9b1ZIU4=; b=ol5zDrRKfRxjdt daLb4XqAimd1w/T7p1fiJGa5heG9pEfbQqthcl8qfdY8KuomBSijGyEUZq9xlf8hNUBd/zp63tWKZ V9Ld4MgOW0ajtZtwmO1L3Rc/2bLddZ7cea4APLuYqT5ZTaHbjNxZzep8wDOCKN3OKIi4Sb4UOQXHF IrKQJ4cdx0IGnq/uNuT14K7owe1o9co1P06KFfw/5foeRuJBlcuT5Zg5tjdvop10xZbLuYiJZJY83 ERDhYvnqhh0HTdqC8LWOO/RJxEgcf/sZ5WdmN07n3bOrHj8dMLbgsQNXDF6Z2b2RZHqiaHVs1yXFx SO5aMtrYUkrk97vH1uug==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1rT2p5-00000000sCa-3AGU; Thu, 25 Jan 2024 16:43:27 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1rT2ok-00000000rvH-3i1v for linux-arm-kernel@lists.infradead.org; Thu, 25 Jan 2024 16:43:08 +0000 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 D2B4A1477; Thu, 25 Jan 2024 08:43:48 -0800 (PST) Received: from e121798.cable.virginm.net (unknown [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id E1DA43F5A1; Thu, 25 Jan 2024 08:42:58 -0800 (PST) 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 v3 03/35] mm: page_alloc: Add an arch hook to filter MIGRATE_CMA allocations Date: Thu, 25 Jan 2024 16:42:24 +0000 Message-Id: <20240125164256.4147-4-alexandru.elisei@arm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240125164256.4147-1-alexandru.elisei@arm.com> References: <20240125164256.4147-1-alexandru.elisei@arm.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240125_084306_991871_3F402C31 X-CRM114-Status: GOOD ( 10.67 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org As an architecture might have specific requirements around the allocation of CMA pages, add an arch hook that can disable allocations from MIGRATE_CMA, if the allocation was otherwise allowed. This will be used by arm64, which will put tag storage pages on the MIGRATE_CMA list, and tag storage pages cannot be tagged. The filter will be used to deny using MIGRATE_CMA for __GFP_TAGGED allocations. Signed-off-by: Alexandru Elisei --- include/linux/pgtable.h | 7 +++++++ mm/page_alloc.c | 3 ++- 2 files changed, 9 insertions(+), 1 deletion(-) diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h index 6d98d5fdd697..c5ddec6b5305 100644 --- a/include/linux/pgtable.h +++ b/include/linux/pgtable.h @@ -905,6 +905,13 @@ static inline void arch_do_swap_page(struct mm_struct *mm, static inline void arch_free_pages_prepare(struct page *page, int order) { } #endif +#ifndef __HAVE_ARCH_ALLOC_CMA +static inline bool arch_alloc_cma(gfp_t gfp) +{ + return true; +} +#endif + #ifndef __HAVE_ARCH_UNMAP_ONE /* * Some architectures support metadata associated with a page. When a diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 27282a1c82fe..a96d47a6393e 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -3157,7 +3157,8 @@ static inline unsigned int gfp_to_alloc_flags_cma(gfp_t gfp_mask, unsigned int alloc_flags) { #ifdef CONFIG_CMA - if (gfp_migratetype(gfp_mask) == MIGRATE_MOVABLE) + if (gfp_migratetype(gfp_mask) == MIGRATE_MOVABLE && + arch_alloc_cma(gfp_mask)) alloc_flags |= ALLOC_CMA; #endif return alloc_flags;