From patchwork Thu Apr 4 05:51:28 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexandre Ghiti X-Patchwork-Id: 10885009 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 18589922 for ; Thu, 4 Apr 2019 05:57:08 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id F1C0F285C6 for ; Thu, 4 Apr 2019 05:57:07 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id E223728A26; Thu, 4 Apr 2019 05:57:07 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_NONE autolearn=ham version=3.3.1 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5136C285C6 for ; Thu, 4 Apr 2019 05:57:07 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 8CE3A6B0003; Thu, 4 Apr 2019 01:57:06 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 87C9A6B0006; Thu, 4 Apr 2019 01:57:06 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 745FA6B026E; Thu, 4 Apr 2019 01:57:06 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from mail-ed1-f71.google.com (mail-ed1-f71.google.com [209.85.208.71]) by kanga.kvack.org (Postfix) with ESMTP id 26FFF6B0003 for ; Thu, 4 Apr 2019 01:57:06 -0400 (EDT) Received: by mail-ed1-f71.google.com with SMTP id w3so798832edt.2 for ; Wed, 03 Apr 2019 22:57:06 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-original-authentication-results:x-gm-message-state:from:to:cc :subject:date:message-id:in-reply-to:references:mime-version :content-transfer-encoding; bh=Y+bi4NQArS1VzeWh7XXC5FNgs+8EM5PQ5CBJ928Rp7U=; b=E+fVkwaql1y6uheqQRgA5BqQcme+C+39BbqMg3RaklPG78kH/uWVGsWRD2UJA0H2ZK 9r0Qg1q0lsvhsVKLg5Gps7KIBBjB+G+UCCaWUomy09B9aGZW/D6eCiXd5qBuMyoKKW73 pYbA7FHUL1fSf+2JtSKv74jx8c4tSbxQpcRTzmHFzxHOiAPBAWfwdGSmgLu7ArHBQLHf 2+BhMjxbcqti7ptA099NGEdP9o9tvVt/RhtkyP+wT2D1XTpIogb3TBq4XdJWY3l+50Zs ZiUnimM4ids9+gZ+oXZnGUjV6IBz1EBEVjnyq1sTInRLmu+ketK4p4prs2TGkqWnvEjq jSuQ== X-Original-Authentication-Results: mx.google.com; spf=neutral (google.com: 217.70.183.200 is neither permitted nor denied by best guess record for domain of alex@ghiti.fr) smtp.mailfrom=alex@ghiti.fr X-Gm-Message-State: APjAAAXu05D/Hn267HjU0Y6RldbxScv9arssN6a760+qPEbN7QZC2Du2 Hzd4Jebm8zZ8FWBvnw6YvD72KZ5y3EOUgdjwG8b62g5IxGj8ig9KJSQidE2SoxcpC9p7nFC7k0U 9ADq3e+lM889qpsg3QGdu8vyDv2UQnQioW2QIs4dtQRBno9bGuOn6hNiS6gmtZCU= X-Received: by 2002:aa7:c803:: with SMTP id a3mr2454178edt.39.1554357425619; Wed, 03 Apr 2019 22:57:05 -0700 (PDT) X-Google-Smtp-Source: APXvYqw0cZyrQfKpU9DzON8E+CDNVtj9QpP3x3XMrKAozscYLUVGRLLc/xcT2758hq2x1OPxRXcp X-Received: by 2002:aa7:c803:: with SMTP id a3mr2454122edt.39.1554357424762; Wed, 03 Apr 2019 22:57:04 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1554357424; cv=none; d=google.com; s=arc-20160816; b=UHqKSz1vOZsKDIOFUdwtRrxUu5uozfrNSGls0wjZBe8K4W+oxqVn1KaGRP7HE+dFpJ UqPqDEMrIuNO5ByEznWeWhC7ZMTVheAlo1R5o543Va0xe+P1R8PI2dzYqMRNSquAx+rg eqt6BGqi4MduyetGDw+eivuQjz6j4uet6LqJ7SXWluAl2KevKLRxLRi2qNAFu1W3Oqm1 XycByctZgervlFlUxyWfNspfrOXUsekg+UW2NPf5qqtZustFqfmr4BPoqhOtcNopl5o5 ctcDNCGJD52+GqtA9UK8yoGgoGg1Nz4jeVUYmcW3OyoBo38cpDakUkB06TUu+jJQsmKq Mr5w== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from; bh=Y+bi4NQArS1VzeWh7XXC5FNgs+8EM5PQ5CBJ928Rp7U=; b=r1AbBWi6j/gD3Y7eq2v9DnhVBRETBzjdAdL+AeVketHjChQfRUaxsZXSle8BLHnVkS q3CCZK20vljLeiulecgWKtVZKjs0KuBofHFZ9xr+8ptQgSo9iFVf95m3uX/6uj5XknlC g+rh+nHt+4giwbBIEJJvIku0gaOn6fQ5RFFBh/Nsz0KFsEjVth7KKtl5lCAptHFaSFfj nZF8i3mjYrtGYe/AsWPwvvUfuFrBhPI5DUGxImQnalBibL7RvGVc/E/OvI8MbJmVK1Sm Lm8hfIM0j+Gnpxr0dCCblcPE58J4Ng/2QIkArU029KqIUgRv73vTUwUT6gLljv6UHB+3 zfZA== ARC-Authentication-Results: i=1; mx.google.com; spf=neutral (google.com: 217.70.183.200 is neither permitted nor denied by best guess record for domain of alex@ghiti.fr) smtp.mailfrom=alex@ghiti.fr Received: from relay7-d.mail.gandi.net (relay7-d.mail.gandi.net. [217.70.183.200]) by mx.google.com with ESMTPS id f55si907239edb.217.2019.04.03.22.57.04 for (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Wed, 03 Apr 2019 22:57:04 -0700 (PDT) Received-SPF: neutral (google.com: 217.70.183.200 is neither permitted nor denied by best guess record for domain of alex@ghiti.fr) client-ip=217.70.183.200; Authentication-Results: mx.google.com; spf=neutral (google.com: 217.70.183.200 is neither permitted nor denied by best guess record for domain of alex@ghiti.fr) smtp.mailfrom=alex@ghiti.fr X-Originating-IP: 79.86.19.127 Received: from alex.numericable.fr (127.19.86.79.rev.sfr.net [79.86.19.127]) (Authenticated sender: alex@ghiti.fr) by relay7-d.mail.gandi.net (Postfix) with ESMTPSA id 144E02000D; Thu, 4 Apr 2019 05:56:59 +0000 (UTC) From: Alexandre Ghiti To: Andrew Morton Cc: Christoph Hellwig , Russell King , Catalin Marinas , Will Deacon , Ralf Baechle , Paul Burton , James Hogan , Palmer Dabbelt , Albert Ou , Alexander Viro , Luis Chamberlain , Kees Cook , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mips@vger.kernel.org, linux-riscv@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, Alexandre Ghiti Subject: [PATCH v2 5/5] riscv: Make mmap allocation top-down by default Date: Thu, 4 Apr 2019 01:51:28 -0400 Message-Id: <20190404055128.24330-6-alex@ghiti.fr> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190404055128.24330-1-alex@ghiti.fr> References: <20190404055128.24330-1-alex@ghiti.fr> MIME-Version: 1.0 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000093, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: X-Virus-Scanned: ClamAV using ClamSMTP In order to avoid wasting user address space by using bottom-up mmap allocation scheme, prefer top-down scheme when possible. Before: root@qemuriscv64:~# cat /proc/self/maps 00010000-00016000 r-xp 00000000 fe:00 6389 /bin/cat.coreutils 00016000-00017000 r--p 00005000 fe:00 6389 /bin/cat.coreutils 00017000-00018000 rw-p 00006000 fe:00 6389 /bin/cat.coreutils 00018000-00039000 rw-p 00000000 00:00 0 [heap] 1555556000-155556d000 r-xp 00000000 fe:00 7193 /lib/ld-2.28.so 155556d000-155556e000 r--p 00016000 fe:00 7193 /lib/ld-2.28.so 155556e000-155556f000 rw-p 00017000 fe:00 7193 /lib/ld-2.28.so 155556f000-1555570000 rw-p 00000000 00:00 0 1555570000-1555572000 r-xp 00000000 00:00 0 [vdso] 1555574000-1555576000 rw-p 00000000 00:00 0 1555576000-1555674000 r-xp 00000000 fe:00 7187 /lib/libc-2.28.so 1555674000-1555678000 r--p 000fd000 fe:00 7187 /lib/libc-2.28.so 1555678000-155567a000 rw-p 00101000 fe:00 7187 /lib/libc-2.28.so 155567a000-15556a0000 rw-p 00000000 00:00 0 3fffb90000-3fffbb1000 rw-p 00000000 00:00 0 [stack] After: root@qemuriscv64:~# cat /proc/self/maps 00010000-00016000 r-xp 00000000 fe:00 6389 /bin/cat.coreutils 00016000-00017000 r--p 00005000 fe:00 6389 /bin/cat.coreutils 00017000-00018000 rw-p 00006000 fe:00 6389 /bin/cat.coreutils 00018000-00039000 rw-p 00000000 00:00 0 [heap] 3ff7eb6000-3ff7ed8000 rw-p 00000000 00:00 0 3ff7ed8000-3ff7fd6000 r-xp 00000000 fe:00 7187 /lib/libc-2.28.so 3ff7fd6000-3ff7fda000 r--p 000fd000 fe:00 7187 /lib/libc-2.28.so 3ff7fda000-3ff7fdc000 rw-p 00101000 fe:00 7187 /lib/libc-2.28.so 3ff7fdc000-3ff7fe2000 rw-p 00000000 00:00 0 3ff7fe4000-3ff7fe6000 r-xp 00000000 00:00 0 [vdso] 3ff7fe6000-3ff7ffd000 r-xp 00000000 fe:00 7193 /lib/ld-2.28.so 3ff7ffd000-3ff7ffe000 r--p 00016000 fe:00 7193 /lib/ld-2.28.so 3ff7ffe000-3ff7fff000 rw-p 00017000 fe:00 7193 /lib/ld-2.28.so 3ff7fff000-3ff8000000 rw-p 00000000 00:00 0 3fff888000-3fff8a9000 rw-p 00000000 00:00 0 [stack] Signed-off-by: Alexandre Ghiti Reviewed-by: Christoph Hellwig --- arch/riscv/Kconfig | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index eb56c82d8aa1..fe09f38ef9a9 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -49,6 +49,17 @@ config RISCV select GENERIC_IRQ_MULTI_HANDLER select ARCH_HAS_PTE_SPECIAL select HAVE_EBPF_JIT if 64BIT + select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT + select HAVE_ARCH_MMAP_RND_BITS + +config ARCH_MMAP_RND_BITS_MIN + default 18 + +# max bits determined by the following formula: +# VA_BITS - PAGE_SHIFT - 3 +config ARCH_MMAP_RND_BITS_MAX + default 33 if 64BIT # SV48 based + default 18 config MMU def_bool y