From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B75B1181BB2; Thu, 18 Apr 2024 21:01:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713474096; cv=none; b=juJVu8Pax7GY/2jO7F3QFUV2bMvNmO3PYQKqR270aq9nhRsFMRT1pHXTh6vNegjsO76hGpnp27D/LZOsYB3prDpto9hAp5SelZsC8WUZFZ9/EkLMlASjIUFCAJYgnLxDIYe2HRMUR5+/drE8yZWwtdFFsLi4XqdUCCjKBs2OwgU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713474096; c=relaxed/simple; bh=Q9xFEu3Y5LoeO0EqCkhUGHL0dsvPtZI4/AmKYvf5MnY=; h=MIME-Version:References:In-Reply-To:From:Date:Message-ID:Subject: To:Cc:Content-Type; b=b+0txUzk5jK372QzTaz06e3UetBupnMUMh0c0sXUWXVGXQbNID8oChy+JzzSmHlvrbXEBhABFCYWr1jkplkUVNUld8ypXwzVqN/rfPwJ3r67GfYI2KH1PZxyEhljlZQoB3vXJHhS1sFr5xDKu3NQSoWCKV7cNkptrG0rWtw4EI8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=os3i7OUl; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="os3i7OUl" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2941AC116B1; Thu, 18 Apr 2024 21:01:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1713474096; bh=Q9xFEu3Y5LoeO0EqCkhUGHL0dsvPtZI4/AmKYvf5MnY=; h=References:In-Reply-To:From:Date:Subject:To:Cc:From; b=os3i7OUlnuFPwuywx5IIlmo6dtB59/Q7XJaGiZcHLePn7Eo9BufTvQVTR9mtW/eWI r4VK8QYyOlINdoOVjMcOehKmc6Sz4RWc7AtrGTHCmGpbXOTolpO+C2kb76Yr0cYvCD FMV4Iw8AtSf28SLOw4t9ku4hBlZ5jBKnjL2Jb3XS6QpCLdtSLjS9TIGuRVkBAtaceK Ynk+zxcFm8+Rdi8k+nN2pCkddAj7x4BuIRqRa6CNsxBp/r1PxXoHz9fS6XaoKD1pY8 suIp6V5PCH1MCOf8eW5abdXsn+Qdv014GIVeNCWNab/ijMMs94IjvrIAImNdFlp9rg H2pmiaunPJ3ng== Received: by mail-lf1-f48.google.com with SMTP id 2adb3069b0e04-5193363d255so1680614e87.3; Thu, 18 Apr 2024 14:01:36 -0700 (PDT) X-Forwarded-Encrypted: i=1; AJvYcCXdsvnbLDbcUzdTwvNlfEf/J2+sRkWH+nKCsviXNlfBx3cDYng6/7AWgS6PTAFPIlk3Z7Emj69Zu/ZGHHYs6zSXTa+Oy+ttoUBdIdBtHg0AB+4XjekacyTx1qh8Xh4+4JHTTQhdTQ+jGFirf0pTn4wZvIlU+Wg4vdnMjDWgzIaVaAd7rS03c8i+nPQWdUt3TjBWi1VarY3Px16fo2aGdrqPKH5CS/6T4MWguKsofonzcpAiBdB4iLBHmVm10oLwbvgCTsWQd3fJz6jm6LstPIDpaYS3CwJv7i1M4sTdgKKMHw3vdySSytDoWcsXfUPNvSW4GNQcgA3k4V+741spUVa0kElB0fwD4htNDnjEwsEkAZxtyKRztK773FFcbfUfBoJAj6GsNkKwJzXlhAmzpWfTwhRIFnPCpXf8aOD/IRjXSd/AhUAO1LLgLos= X-Gm-Message-State: AOJu0YyVr8D8aTN3AsKi5MTkbI+ETPboRkITKyi31uZXtp7shRbDFjct TfiUcwVZ+Ay5YhV7bwS6+4UzYAL+m0x4/5LUtYwf4kuu7tAZbeG0JeItREuz8sqnDrsZA2qeiTN xRtZE+HXyocLjRYPOJs5fQESe6dY= X-Google-Smtp-Source: AGHT+IHNxy9sJsnZs3KQVfU0+czeg8tBpsYhbjwNsSaDNt4tlgSyRo9Mz2ssjEN7kjA5vVRJEg5DihQkgyMA2Jl/jC4= X-Received: by 2002:a05:6512:1251:b0:516:cec0:1fc0 with SMTP id fb17-20020a056512125100b00516cec01fc0mr104453lfb.63.1713474094462; Thu, 18 Apr 2024 14:01:34 -0700 (PDT) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 References: <20240411160051.2093261-1-rppt@kernel.org> <20240411160051.2093261-6-rppt@kernel.org> <20240415075241.GF40213@noisy.programming.kicks-ass.net> In-Reply-To: From: Song Liu Date: Thu, 18 Apr 2024 14:01:22 -0700 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH v4 05/15] mm: introduce execmem_alloc() and execmem_free() To: Mike Rapoport Cc: Mark Rutland , Peter Zijlstra , linux-kernel@vger.kernel.org, Alexandre Ghiti , Andrew Morton , Bjorn Topel , Catalin Marinas , Christophe Leroy , "David S. Miller" , Dinh Nguyen , Donald Dutile , Eric Chanudet , Heiko Carstens , Helge Deller , Huacai Chen , Kent Overstreet , Luis Chamberlain , Michael Ellerman , Nadav Amit , Palmer Dabbelt , Puranjay Mohan , Rick Edgecombe , Russell King , Steven Rostedt , Thomas Bogendoerfer , Thomas Gleixner , Will Deacon , bpf@vger.kernel.org, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mips@vger.kernel.org, linux-mm@kvack.org, linux-modules@vger.kernel.org, linux-parisc@vger.kernel.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, loongarch@lists.linux.dev, netdev@vger.kernel.org, sparclinux@vger.kernel.org, x86@kernel.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, Apr 18, 2024 at 10:54=E2=80=AFAM Mike Rapoport wr= ote: > > On Thu, Apr 18, 2024 at 09:13:27AM -0700, Song Liu wrote: > > On Thu, Apr 18, 2024 at 8:37=E2=80=AFAM Mike Rapoport = wrote: > > > > > > > > > > I'm looking at execmem_types more as definition of the consumers,= maybe I > > > > > should have named the enum execmem_consumer at the first place. > > > > > > > > I think looking at execmem_type from consumers' point of view adds > > > > unnecessary complexity. IIUC, for most (if not all) archs, ftrace, = kprobe, > > > > and bpf (and maybe also module text) all have the same requirements= . > > > > Did I miss something? > > > > > > It's enough to have one architecture with different constrains for kp= robes > > > and bpf to warrant a type for each. > > > > AFAICT, some of these constraints can be changed without too much work. > > But why? > I honestly don't understand what are you trying to optimize here. A few > lines of initialization in execmem_info? IIUC, having separate EXECMEM_BPF and EXECMEM_KPROBE makes it harder for bpf and kprobe to share the same ROX page. In many use cases, a 2MiB page (assuming x86_64) is enough for all BPF, kprobe, ftrace, and module text. It is not efficient if we have to allocate separate pages for = each of these use cases. If this is not a problem, the current approach works. Thanks, Song 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 116BAC4345F for ; Thu, 18 Apr 2024 21:02:11 +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:Cc:To:Subject:Message-ID:Date:From: In-Reply-To:References:MIME-Version:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=+dyalLYc458M3ZlZLbmaMV9cfzL7iLu3m9QPRA+0K1U=; b=UowNzGse3VMVJ+ 6U+XIn2lWZLLTF/V3SG6s26aH8EUy1uiUfkNkDch947pVCzSg63C/UaTbwqPQY2iAS4dfP+irn+z6 +NqVcUyZn7kgOt/jUZOJTpxYBDpyfaN2upTo4iSuecrMwZ1f62izKW1fRApcEIF9P4ryXmCpJ1PKi 9gwTSLtuS6O8pVxqXhM6Q6b+BSN3ZEWHw15llmYjAXZNTtWOlk9J57x3c+8acA+eUXEE/2/wLKHwD ZPjCd6Z/Ygvzfris59+jJlZJfHPjjTOS97z+PH+RZNeEMgdgel75ewHwxtHwCvKxdn1TtiHK1tj46 7pbvgpjRJp4N5FGuZqKA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1rxYtN-00000003hip-2jJD; Thu, 18 Apr 2024 21:02:01 +0000 Received: from dfw.source.kernel.org ([139.178.84.217]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1rxYtJ-00000003hhF-1Woe; Thu, 18 Apr 2024 21:01:58 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id CEBA4618F6; Thu, 18 Apr 2024 21:01:56 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 79069C113CC; Thu, 18 Apr 2024 21:01:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1713474116; bh=Q9xFEu3Y5LoeO0EqCkhUGHL0dsvPtZI4/AmKYvf5MnY=; h=References:In-Reply-To:From:Date:Subject:To:Cc:From; b=LKsu6wgwztewDd1Kf4NCYPGtYXsdZ+ofFTa2d1MI2zHPuKQq+mmWhhJ/cfOoO74/D CmcZP1gphR1rk0/C2WrZMmDohWk9TLfoE/BVlmPcx4Ya9rM6Nh6AU0ABzg9gD2wvws H60UGmuK3KY+NjPIGsNka51Re3XwprsD1pbbtq74ctVkAghiYQUsQoRN8cLIcXPPsL rXx3eFrMppxOnjZtTYcB0+vT04YNLcaQFvbo1fn264bSOiuX8e1yptQTDfZHVYZ58/ 0oeaQEoE1JgibuYG0nL+yludx9odg4AlyJea9d8FGku7Y1tGZRmj1BnxpJESiJFknk jlSY0S/C8n1Cg== Received: by mail-lf1-f53.google.com with SMTP id 2adb3069b0e04-5194a2cf7c2so1382944e87.0; Thu, 18 Apr 2024 14:01:56 -0700 (PDT) X-Forwarded-Encrypted: i=1; AJvYcCVZZja/hdY+2dAMCL4Zzigqj0jMFySOpwerg599UjSB8zA4prvx6zJZAKW9Juxvl+8uuDB5yGi0eY9BwSyJ7DXDN1n7Fz0PIJpiM2tI+ZNFqaWPxefzk8J2f6J9TTYHmqJVYvY0YSKmSVSnyoBexArZcpkIhj4= X-Gm-Message-State: AOJu0YzNPpjpBLPm2WnHs0IK3SD72g94F6yKjSfIrriOjyaa5LxAtPRc NAQxPr1/KhZFNVNnL7EAKwt0bq0uRQhi8hTMY4LqNqaURO4vNNDsxAXe7jx4KFPE8F0tc2BzZC6 25I9sTvLhPHuTr73/h0Mr6u5VfBM= X-Google-Smtp-Source: AGHT+IHNxy9sJsnZs3KQVfU0+czeg8tBpsYhbjwNsSaDNt4tlgSyRo9Mz2ssjEN7kjA5vVRJEg5DihQkgyMA2Jl/jC4= X-Received: by 2002:a05:6512:1251:b0:516:cec0:1fc0 with SMTP id fb17-20020a056512125100b00516cec01fc0mr104453lfb.63.1713474094462; Thu, 18 Apr 2024 14:01:34 -0700 (PDT) MIME-Version: 1.0 References: <20240411160051.2093261-1-rppt@kernel.org> <20240411160051.2093261-6-rppt@kernel.org> <20240415075241.GF40213@noisy.programming.kicks-ass.net> In-Reply-To: From: Song Liu Date: Thu, 18 Apr 2024 14:01:22 -0700 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH v4 05/15] mm: introduce execmem_alloc() and execmem_free() To: Mike Rapoport Cc: Mark Rutland , Peter Zijlstra , linux-kernel@vger.kernel.org, Alexandre Ghiti , Andrew Morton , Bjorn Topel , Catalin Marinas , Christophe Leroy , "David S. Miller" , Dinh Nguyen , Donald Dutile , Eric Chanudet , Heiko Carstens , Helge Deller , Huacai Chen , Kent Overstreet , Luis Chamberlain , Michael Ellerman , Nadav Amit , Palmer Dabbelt , Puranjay Mohan , Rick Edgecombe , Russell King , Steven Rostedt , Thomas Bogendoerfer , Thomas Gleixner , Will Deacon , bpf@vger.kernel.org, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mips@vger.kernel.org, linux-mm@kvack.org, linux-modules@vger.kernel.org, linux-parisc@vger.kernel.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, loongarch@lists.linux.dev, netdev@vger.kernel.org, sparclinux@vger.kernel.org, x86@kernel.org X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240418_140157_505537_FE68DBD9 X-CRM114-Status: GOOD ( 19.24 ) 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; 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Miller" , Dinh Nguyen , Donald Dutile , Eric Chanudet , Heiko Carstens , Helge Deller , Huacai Chen , Kent Overstreet , Luis Chamberlain , Michael Ellerman , Nadav Amit , Palmer Dabbelt , Puranjay Mohan , Rick Edgecombe , Russell King , Steven Rostedt , Thomas Bogendoerfer , Thomas Gleixner , Will Deacon , bpf@vger.kernel.org, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mips@vger.kernel.org, linux-mm@kvack.org, linux-modules@vger.kernel.org, linux-parisc@vger.kernel.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, loongarch@lists.linux.dev, netdev@vger.kernel.org, sparclinux@vger.kernel.org, x86@kernel.org X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240418_140157_505537_FE68DBD9 X-CRM114-Status: GOOD ( 19.24 ) 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="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org T24gVGh1LCBBcHIgMTgsIDIwMjQgYXQgMTA6NTTigK9BTSBNaWtlIFJhcG9wb3J0IDxycHB0QGtl cm5lbC5vcmc+IHdyb3RlOgo+Cj4gT24gVGh1LCBBcHIgMTgsIDIwMjQgYXQgMDk6MTM6MjdBTSAt MDcwMCwgU29uZyBMaXUgd3JvdGU6Cj4gPiBPbiBUaHUsIEFwciAxOCwgMjAyNCBhdCA4OjM34oCv QU0gTWlrZSBSYXBvcG9ydCA8cnBwdEBrZXJuZWwub3JnPiB3cm90ZToKPiA+ID4gPiA+Cj4gPiA+ ID4gPiBJJ20gbG9va2luZyBhdCBleGVjbWVtX3R5cGVzIG1vcmUgYXMgZGVmaW5pdGlvbiBvZiB0 aGUgY29uc3VtZXJzLCBtYXliZSBJCj4gPiA+ID4gPiBzaG91bGQgaGF2ZSBuYW1lZCB0aGUgZW51 bSBleGVjbWVtX2NvbnN1bWVyIGF0IHRoZSBmaXJzdCBwbGFjZS4KPiA+ID4gPgo+ID4gPiA+IEkg dGhpbmsgbG9va2luZyBhdCBleGVjbWVtX3R5cGUgZnJvbSBjb25zdW1lcnMnIHBvaW50IG9mIHZp ZXcgYWRkcwo+ID4gPiA+IHVubmVjZXNzYXJ5IGNvbXBsZXhpdHkuIElJVUMsIGZvciBtb3N0IChp ZiBub3QgYWxsKSBhcmNocywgZnRyYWNlLCBrcHJvYmUsCj4gPiA+ID4gYW5kIGJwZiAoYW5kIG1h eWJlIGFsc28gbW9kdWxlIHRleHQpIGFsbCBoYXZlIHRoZSBzYW1lIHJlcXVpcmVtZW50cy4KPiA+ ID4gPiBEaWQgSSBtaXNzIHNvbWV0aGluZz8KPiA+ID4KPiA+ID4gSXQncyBlbm91Z2ggdG8gaGF2 ZSBvbmUgYXJjaGl0ZWN0dXJlIHdpdGggZGlmZmVyZW50IGNvbnN0cmFpbnMgZm9yIGtwcm9iZXMK PiA+ID4gYW5kIGJwZiB0byB3YXJyYW50IGEgdHlwZSBmb3IgZWFjaC4KPiA+Cj4gPiBBRkFJQ1Qs IHNvbWUgb2YgdGhlc2UgY29uc3RyYWludHMgY2FuIGJlIGNoYW5nZWQgd2l0aG91dCB0b28gbXVj aCB3b3JrLgo+Cj4gQnV0IHdoeT8KPiBJIGhvbmVzdGx5IGRvbid0IHVuZGVyc3RhbmQgd2hhdCBh cmUgeW91IHRyeWluZyB0byBvcHRpbWl6ZSBoZXJlLiBBIGZldwo+IGxpbmVzIG9mIGluaXRpYWxp emF0aW9uIGluIGV4ZWNtZW1faW5mbz8KCklJVUMsIGhhdmluZyBzZXBhcmF0ZSBFWEVDTUVNX0JQ RiBhbmQgRVhFQ01FTV9LUFJPQkUgbWFrZXMgaXQKaGFyZGVyIGZvciBicGYgYW5kIGtwcm9iZSB0 byBzaGFyZSB0aGUgc2FtZSBST1ggcGFnZS4gSW4gbWFueSB1c2UgY2FzZXMsCmEgMk1pQiBwYWdl IChhc3N1bWluZyB4ODZfNjQpIGlzIGVub3VnaCBmb3IgYWxsIEJQRiwga3Byb2JlLCBmdHJhY2Us IGFuZAptb2R1bGUgdGV4dC4gSXQgaXMgbm90IGVmZmljaWVudCBpZiB3ZSBoYXZlIHRvIGFsbG9j YXRlIHNlcGFyYXRlIHBhZ2VzIGZvciBlYWNoCm9mIHRoZXNlIHVzZSBjYXNlcy4gSWYgdGhpcyBp cyBub3QgYSBwcm9ibGVtLCB0aGUgY3VycmVudCBhcHByb2FjaCB3b3Jrcy4KClRoYW5rcywKU29u ZwoKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KbGludXgt YXJtLWtlcm5lbCBtYWlsaW5nIGxpc3QKbGludXgtYXJtLWtlcm5lbEBsaXN0cy5pbmZyYWRlYWQu b3JnCmh0dHA6Ly9saXN0cy5pbmZyYWRlYWQub3JnL21haWxtYW4vbGlzdGluZm8vbGludXgtYXJt LWtlcm5lbAo=