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 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 2867EC77B7A for ; Tue, 30 May 2023 09:59:55 +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:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=APJFdUm83vD8xe4DUCpO7oRP1dzzKx/UDHqu+i2ERgA=; b=uj1k3Nu8KZ5fF1 BHq1pj4RJgupe4t2QKl+UsukfnY5q9nfVCcVYCYv+FvCtBSyhzHM3K5Z7oQGglTq85c9o2ebiLm9O hGh7H/4M2pDmNK5vZpeJAOS6Lz4pU3MFc6Nsb94DKQejk14N5zqmN5iAEMTptL345lW5Ief1RCfdu BXDgWT5vhwlh5zxDNF1NvtTju1e7HSgK0CAfOwXomO+HyJV9Ur/qFXAa2M8L4DeS303wGU/ottPST dbXulW7ahSM2eupMmFIDoJbsCFnV9sI1lWbDyYfa/MWvWrhFo6BVUlk5/eXPTdTd8phhubKr73ohy mcW9eUMSzi3x7ckRHB1Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1q3w8s-00DHZB-0g; Tue, 30 May 2023 09:59:50 +0000 Received: from dfw.source.kernel.org ([139.178.84.217]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1q3w8p-00DHYG-0z for linux-riscv@lists.infradead.org; Tue, 30 May 2023 09:59:48 +0000 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 58C1A62CE1; Tue, 30 May 2023 09:59:46 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6C3FCC433EF; Tue, 30 May 2023 09:59:44 +0000 (UTC) Date: Tue, 30 May 2023 10:59:41 +0100 From: Catalin Marinas To: Conor Dooley Cc: Jisheng Zhang , Paul Walmsley , Palmer Dabbelt , Albert Ou , linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 5/6] riscv: allow kmalloc() caches aligned to the smallest value Message-ID: References: <20230526165958.908-1-jszhang@kernel.org> <20230526165958.908-6-jszhang@kernel.org> <20230529-fidelity-booted-0d4055d1f559@wendy> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20230529-fidelity-booted-0d4055d1f559@wendy> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230530_025947_403658_53CB05D1 X-CRM114-Status: GOOD ( 13.92 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org On Mon, May 29, 2023 at 12:17:46PM +0100, Conor Dooley wrote: > On Sat, May 27, 2023 at 12:59:57AM +0800, Jisheng Zhang wrote: > > After this patch, a simple test of booting to a small buildroot rootfs > > on qemu shows: > > > > kmalloc-96 5041 5041 96 ... > > kmalloc-64 9606 9606 64 ... > > kmalloc-32 5128 5128 32 ... > > kmalloc-16 7682 7682 16 ... > > kmalloc-8 10246 10246 8 ... > > > > So we save about 1268KB memory. The saving will be much larger in normal > > OS env on real HW platforms. > > > > [1] Link: https://lore.kernel.org/linux-arm-kernel/20230524171904.3967031-1-catalin.marinas@arm.com/ > > > > Signed-off-by: Jisheng Zhang > > Fails to build chief, with loads of: > linux/dma-mapping.h:546:19: error: redefinition of 'dma_get_cache_alignment' > > And for 32-bit there's also a rake of: > include/linux/slab.h:239:9: warning: 'ARCH_KMALLOC_MINALIGN' macro redefined [-Wmacro-redefined] > > At the very least, reproducable with rv32_defconfig. Have you this it on top of the KMALLOC_MINALIGN preparation series? https://lore.kernel.org/r/20230524171904.3967031-1-catalin.marinas@arm.com/ -- Catalin _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv