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 1D3DDE936FF for ; Thu, 5 Oct 2023 05:28:10 +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=BD5uM6s9XAKOsd0MjXLrRANrdblNbLfUHDF7C7942S4=; b=TkBir91yHICiIa aJj64368HlkN1H6Btrke0qsmdMTa7JsL+VW0EAl1+tcpalVyam0sxIuiplre3owYF1RJ6cg2iZofo 9qT2AtbsKiz/MPlIdxy/1y5W4VHMfj6iduDlKGDDMZGUVc1bHZDg0SmrWHi2PNUZ0j6OIS5qPs1GX kkmUyKLzhlJ11PQfldWJ0+fcsj81wmo1VjXCLQ0f8xwAnRkOWi64AKcbvDYqgYQNFlzGxWuVSZ2NU NvVvxuOz204fj4WHvro2nxL2gznjDR63jBP9hX2s/XSlAWuMe71JXMPdnPcuwCe/HdfOt83uoxZpW XvawH1yAP0hAYmbuPViQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1qoGth-001RuJ-0r; Thu, 05 Oct 2023 05:27:41 +0000 Received: from dfw.source.kernel.org ([2604:1380:4641:c500::1]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1qoGtd-001Rsj-1y; Thu, 05 Oct 2023 05:27:39 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id DF087617EE; Thu, 5 Oct 2023 05:27:36 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E2146C43391; Thu, 5 Oct 2023 05:27:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1696483656; bh=hXymtCmkQgS1mz4WN4LARQgIXsgfg8oCoZqTgfgSt/M=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=BbpCpY2Q0zEwY41GucwBsBZTdMge6AGCY7bXU/clMyyCXKJTV0EDLKXZQhP6Gmvyb i7tzzZViGYUX1/BLXHrp9MgUNcssHkKZ+E07sMIo2XQd9Xhgj8wBFQLGyOjD2kEs17 PxOhx0u+oKdQ8lrzOhlumXDQrrVIpZHitXF+j0a79GixClpVIz2eZl61qc1UDcG73I FDMmfOiG2H8IzEuKKw/M7PogaSgM8X2WZc5kjl+Dp1+hjjwCugO78vBqHSBJRgrtI8 iiiR0aNTydrnms7VNPMV5M6X+tEx0k+2XJsejW9H5dww52kR9ESsW7JTvRKWQR81qv y9fkPnEwbon1w== Date: Thu, 5 Oct 2023 08:26:22 +0300 From: Mike Rapoport To: "Edgecombe, Rick P" Cc: "linux-kernel@vger.kernel.org" , "tglx@linutronix.de" , "deller@gmx.de" , "mcgrof@kernel.org" , "bjorn@kernel.org" , "davem@davemloft.net" , "nadav.amit@gmail.com" , "linux@armlinux.org.uk" , "netdev@vger.kernel.org" , "linux-mips@vger.kernel.org" , "linux-riscv@lists.infradead.org" , "hca@linux.ibm.com" , "catalin.marinas@arm.com" , "kent.overstreet@linux.dev" , "puranjay12@gmail.com" , "palmer@dabbelt.com" , "linux-s390@vger.kernel.org" , "chenhuacai@kernel.org" , "tsbogend@alpha.franken.de" , "linux-trace-kernel@vger.kernel.org" , "mpe@ellerman.id.au" , "linux-parisc@vger.kernel.org" , "x86@kernel.org" , "mark.rutland@arm.com" , "christophe.leroy@csgroup.eu" , "linuxppc-dev@lists.ozlabs.org" , "rostedt@goodmis.org" , "will@kernel.org" , "dinguyen@kernel.org" , "naveen.n.rao@linux.ibm.com" , "sparclinux@vger.kernel.org" , "linux-modules@vger.kernel.org" , "bpf@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "song@kernel.org" , "linux-mm@kvack.org" , "loongarch@lists.linux.dev" , "akpm@linux-foundation.org" Subject: Re: [PATCH v3 03/13] mm/execmem, arch: convert simple overrides of module_alloc to execmem Message-ID: <20231005052622.GD3303@kernel.org> References: <20230918072955.2507221-1-rppt@kernel.org> <20230918072955.2507221-4-rppt@kernel.org> <607927885bb8ca12d4cd5787f01207c256cc8798.camel@intel.com> <00277a3acb36d2309156264c7e8484071bc91614.camel@intel.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <00277a3acb36d2309156264c7e8484071bc91614.camel@intel.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20231004_222737_784691_0D537A69 X-CRM114-Status: GOOD ( 17.34 ) 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: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, Oct 04, 2023 at 03:39:26PM +0000, Edgecombe, Rick P wrote: > On Tue, 2023-10-03 at 17:29 -0700, Rick Edgecombe wrote: > > It seems a bit weird to copy all of this. Is it trying to be faster > > or > > something? > > > > Couldn't it just check r->start in execmem_text/data_alloc() path and > > switch to EXECMEM_DEFAULT if needed then? The execmem_range_is_data() > > part that comes later could be added to the logic there too. So this > > seems like unnecessary complexity to me or I don't see the reason. > > I guess this is a bad idea because if you have the full size array > sitting around anyway you might as well use it and reduce the > exec_mem_alloc() logic. That's was the idea, indeed. :) > Just looking at it from the x86 side (and > similar) though, where there is actually only one execmem_range and it > building this whole array with identical data and it seems weird. Right, most architectures have only one range, but to support all variants that we have, execmem has to maintain the whole array. -- Sincerely yours, Mike. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel