From patchwork Fri Apr 14 13:02:49 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ryan Roberts X-Patchwork-Id: 13211584 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 44CCCC77B72 for ; Fri, 14 Apr 2023 14:16:52 +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=/O6d7/3hQfYF0YEdcxjTlOXYpTTb9Oh2eP4SqOzsKss=; b=ReU4q6LO9Gz2Hu F2N1JQAbNF13ujvzifyWzQwzhwJezbgl4MQFJQdUzBl6AapdxCFrJVy1/0JGlLmMBAqI+4tzW2V4r nYVwM2Pt6owCuE7VkgPFWVzxN6HU1/i4SG6LWho+ELzELuCzwWboBmS/bkkCHfED/oG+iMLXcmYpG pYIH9nodH4WB6d93HWaS9QqWK8aW/D6J7v4EfK/YxEgWpeHvvpDj0J0rGWTpUwmFzdhKsRX9inKmP Mu8yKjFT3EAlmXrfutHLa6DOGUCSTMioarmZ4lZSQq3tzr7alEgaIfH3U71nqPnu9RxBToHrF48bz vqnYBby3bGrF9bl3Ie0g==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1pnKDi-009n3T-1J; Fri, 14 Apr 2023 14:16:10 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1pnJ5I-009bMl-2m for linux-arm-kernel@lists.infradead.org; Fri, 14 Apr 2023 13:03:30 +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 417941713; Fri, 14 Apr 2023 06:04:07 -0700 (PDT) Received: from e125769.cambridge.arm.com (e125769.cambridge.arm.com [10.1.196.26]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id BD1443F6C4; Fri, 14 Apr 2023 06:03:21 -0700 (PDT) From: Ryan Roberts To: Andrew Morton , "Matthew Wilcox (Oracle)" , Yu Zhao , "Yin, Fengwei" Cc: Ryan Roberts , linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org Subject: [RFC v2 PATCH 03/17] mm: Introduce try_vma_alloc_movable_folio() Date: Fri, 14 Apr 2023 14:02:49 +0100 Message-Id: <20230414130303.2345383-4-ryan.roberts@arm.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230414130303.2345383-1-ryan.roberts@arm.com> References: <20230414130303.2345383-1-ryan.roberts@arm.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230414_060325_236056_20499166 X-CRM114-Status: GOOD ( 12.63 ) 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 Opportunistically attempt to allocate high-order folios in highmem, optionally zeroed. Retry with lower orders all the way to order-0, until success. Although, of note, order-1 allocations are skipped since a large folio must be at least order-2 to work with the THP machinery. The user must check what they got with folio_order(). This will be used to oportunistically allocate large folios for anonymous memory with a sensible fallback under memory pressure. For attempts to allocate non-0 orders, we set __GFP_NORETRY to prevent high latency due to reclaim, instead preferring to just try for a lower order. The same approach is used by the readahead code when allocating large folios. Signed-off-by: Ryan Roberts --- mm/memory.c | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) -- 2.25.1 diff --git a/mm/memory.c b/mm/memory.c index 9d5e8be49f3b..ca32f59acef2 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -2989,6 +2989,39 @@ static vm_fault_t fault_dirty_shared_page(struct vm_fault *vmf) return 0; } +static inline struct folio *vma_alloc_movable_folio(struct vm_area_struct *vma, + unsigned long vaddr, int order, bool zeroed) +{ + gfp_t gfp = order > 0 ? __GFP_NORETRY | __GFP_NOWARN : 0; + + if (zeroed) + return vma_alloc_zeroed_movable_folio(vma, vaddr, gfp, order); + else + return vma_alloc_folio(GFP_HIGHUSER_MOVABLE | gfp, order, vma, + vaddr, false); +} + +/* + * Opportunistically attempt to allocate high-order folios, retrying with lower + * orders all the way to order-0, until success. order-1 allocations are skipped + * since a folio must be at least order-2 to work with the THP machinery. The + * user must check what they got with folio_order(). vaddr can be any virtual + * address that will be mapped by the allocated folio. + */ +static struct folio *try_vma_alloc_movable_folio(struct vm_area_struct *vma, + unsigned long vaddr, int order, bool zeroed) +{ + struct folio *folio; + + for (; order > 1; order--) { + folio = vma_alloc_movable_folio(vma, vaddr, order, zeroed); + if (folio) + return folio; + } + + return vma_alloc_movable_folio(vma, vaddr, 0, zeroed); +} + /* * Handle write page faults for pages that can be reused in the current vma *